Improve exception handling

Complete core rewrite, with documentation

See merge request oss/shlax!1

.gitlab-ci.yml

@@ -1,15 +1,36 @@
 build:
   cache:
     key: cache
-    paths: [.cache]
-  image: yourlabs/shlax
-  script: pip install -U --user -e . && CACHE_DIR=$(pwd)/.cache ./shlaxfile.py -d
-    shlax build push
+    paths: [.cache, /var/lib/containers/]
+  image: yourlabs/buildah
+  script:
+  - pip3 install -U --user .[cli]
+  - CACHE_DIR=$(pwd)/.cache python3 ./shlaxfile.py build push=docker://docker.io/yourlabs/shlax:$CI_COMMIT_SHORT_SHA
   stage: build
+
+build-itself:
+  cache:
+    key: cache
+    paths: [.cache, /var/lib/containers/]
+  image: yourlabs/shlax:$CI_COMMIT_SHORT_SHA
+  script: python3 ./shlaxfile.py build push=docker://docker.io/yourlabs/shlax:$CI_COMMIT_REF
+  stage: test
+
+test-exitcode:
+  image: yourlabs/shlax:$CI_COMMIT_SHORT_SHA
+  script:
+  - tests/shlaxfail.py build || [ $? -eq 1 ]
+  - tests/shlaxsuccess.py build
+
+test:
+  image: yourlabs/python
+  stage: build
+  script:
+  - pip install -U --user -e .[test]
+  - py.test -sv tests
+
 pypi:
   image: yourlabs/python
   only: [tags]
   script: pypi-release
   stage: deploy
-test: {image: yourlabs/python, script: 'pip install -U --user -e .[test] && py.test
-    -svv tests', stage: build}

README.md

@@ -0,0 +1,282 @@
+# Shlax: Pythonic automation tool
+
+Shlax is a Python framework for system automation, initially with the purpose
+of replacing docker, docker-compose and ansible with a single tool with the
+purpose of code-reuse made possible by target abstraction.
+
+## Development status: Design state
+
+I got the thing to work with an ugly PoC that I basically brute-forced, I'm
+currently rewriting the codebase with a proper design.
+
+The stories are in development in this order:
+
+- replacing docker build, that's in the state of polishing
+- replacing docker-compose, not in use but the PoC works so far
+- replacing ansible, also working in working PoC state, the shlax command line
+  demonstrates
+
+This project is supposed to unblock me from adding the CI feature to the
+Sentry/GitLab/Portainer implementation I'm doing in pure python on top of
+Django, CRUDLFA+ and Ryzom (isomorphic components in Python to replace
+templates). So, as you can see, I'm really deep in it with a strong
+determination.
+
+Shlax builds its container itself, so check the shlaxfile.py of this repository
+to see what it currently looks like, and check the build job of the CI pipeline
+to see the output.
+
+# Design
+
+The pattern resolves around two moving parts: Actions and Targets.
+
+## Action
+
+An action is a function that takes a target argument, it may execute nested
+actions by passing over the target argument which collects the results.
+
+Example:
+
+```python
+async def hello_world(target):
+    """Bunch of silly commands to demonstrate action programming."""
+    await target.mkdir('foo')
+    python = await target.which('python3', 'python')
+    await target.exec(f'{python} --version > foo/test')
+    version = target.exec('cat foo/test').output
+    print('version')
+```
+
+### Recursion
+
+An action may call other actions recursively. There are two ways:
+
+```python
+async def something(target):
+    # just run the other action code
+    hello_world(target)
+
+    # or delegate the call to target
+    target(hello_world)
+```
+
+In the first case, the resulting count of ran actions will remain 1:
+"something" action.
+
+In the second case, the resulting count of ran actions will be 2: "something"
+and "hello_world".
+
+### Callable classes
+
+Actually in practice, Actions are basic callable Python classes, here's a basic
+example to run a command:
+
+```python
+class Run:
+    def __init__(self, cmd):
+        self.cmd = cmd
+
+    async def __call__(self, target):
+        return await target.exec(self.cmd)
+```
+
+This allows to create callable objects which may be called just like functions
+and as such be appropriate actions, instead of:
+
+```python
+async def one(target):
+    target.exec('one')
+
+async def two(target):
+    target.exec('two')
+```
+
+You can do:
+
+```python
+one = Run('one')
+two = Run('two')
+```
+
+### Parallel execution
+
+Actions may be executed in parallel with an action named ... Parallel. This
+defines an action that will execute three actions in parallel:
+
+```python
+action = Parallel(
+    hello_world,
+    something,
+    Run('echo hi'),
+)
+```
+
+In this case, all actions must succeed for the parallel action to be considered
+a success.
+
+### Methods
+
+An action may also be a method, as long as it just takes a target argument, for
+example:
+
+```python
+class Thing:
+    def start(self, target):
+        """Starts thing"""
+
+    def stop(self, target):
+        """Stops thing"""
+
+action = Thing().start
+```
+
+### Cleaning
+
+If an action defines a `clean` method, it will always be called wether or not
+the action succeeded. Example:
+
+```python
+class Thing:
+    def __call__(self, target):
+        """Do some thing"""
+
+    def clean(self, target):
+        """Clean-up target after __call__"""
+```
+
+### Colorful actions
+
+If an action defines a `colorize` method, it will be called with the colorset
+as argument for every output, this allows to code custom output rendering.
+
+## Target
+
+A Target is mainly an object providing an abstraction layer over the system we
+want to automate with actions. It defines functions to execute a command, mount
+a directory, copy a file, manage environment variables and so on.
+
+### Pre-configuration
+
+A Target can be pre-configured with a list of Actions in which case calling the
+target without argument will execute its Actions until one fails by raising an
+Exception:
+
+```python
+say_hello = Localhost(
+    hello_world,
+    Run('echo hi'),
+)
+await say_hello()
+```
+
+### Results
+
+Every time a target execute an action, it will set the "status" attribute on it
+to "success" or "failure", and add it to the "results" attribute:
+
+```python
+say_hello = Localhost(Run('echo hi'))
+await say_hello()
+say_hello.results  # contains the action with status="success"
+```
+
+## Targets as Actions: the nesting story
+
+We've seen that any callable taking a target argument is good to be considered
+an action, and that targets are callables.
+
+To make a Target runnable like any action, all we had to do is add the target
+keyword argument to `Target.__call__`.
+
+But `target()` fills `self.results`, so nested action results would not
+propagate to the parent target.
+
+That's why if Target receives a non-None target argument, it will has to set
+`self.parent` with it.
+
+This allows nested targets to traverse parents and get to the root Target
+with `target.caller`, where it can then attach results to.
+
+This opens the nice side effect that a target implementation may call the
+parent target if any, you could write a Docker target as such:
+
+```python
+class Docker(Target):
+    def __init__(self, *actions, name):
+        self.name = name
+        super().__init__(*actions)
+
+    async def exec(self, *args):
+        return await self.parent.exec(*['docker', 'exec', self.name] + args)
+```
+
+This also means that you always need a parent with an exec implementation,
+there are two:
+
+- Localhost, executes on localhost
+- Stub, for testing
+
+The result of that design is that the following use cases are available:
+
+```python
+# This action installs my favorite package on any distro
+action = Packages('python3')
+
+# Run it right here: apt install python3
+Localhost()(action)
+
+# Or remotely: ssh yourhost apt install python3
+Ssh(host='yourhost')(action)
+
+# Let's make a container build receipe with that action
+build = Buildah(package)
+
+# Run it locally: buildah exec apt install python3
+Localhost()(build)
+
+# Or on a server: ssh yourhost build exec apt install python3
+Ssh(host='yourhost')(build)
+
+# Or on a server behingh a bastion:
+# ssh yourbastion ssh yourhost build exec apt install python3
+Localhost()(Ssh(host='bastion')(Ssh(host='yourhost')(build))
+
+# That's going to do the same
+Localhost(Ssh(
+    Ssh(
+        build,
+        host='yourhost'
+    ),
+    host='bastion'
+))()
+```
+
+## CLI
+
+You can execute Shlax actions directly on the command line with the `shlax` CLI
+command.
+
+For your own Shlaxfiles, you can build your CLI with your favorite CLI
+framework. If you decide to use `cli2`, then Shlax provides a thin layer on top
+of it: Group and Command objects made for Shlax objects.
+
+For example:
+
+```python
+yourcontainer = Container(
+    build=Buildah(
+        User('app', '/app', 1000),
+        Packages('python', 'unzip', 'findutils'),
+        Copy('setup.py', 'yourdir', '/app'),
+        base='archlinux',
+        commit='yourimage',
+    ),
+)
+
+
+if __name__ == '__main__':
+    print(Group(doc=__doc__).load(yourcontainer).entry_point())
+```
+
+The above will execute a cli2 command with each method of yourcontainer as a
+sub-command.

setup.py

@@ -5,10 +5,9 @@ setup(
     name='shlax',
     versioning='dev',
     setup_requires='setupmeta',
-    install_requires=['cli2>=1.1.6'],
     extras_require=dict(
-        full=[
-            'pyyaml',
+        cli=[
+            'cli2>=2.3.0',
         ],
         test=[
             'pytest',
@@ -25,7 +24,7 @@ setup(
     python_requires='>=3',
     entry_points={
         'console_scripts': [
-            'shlax = shlax.cli:cli',
+            'shlax = shlax.cli:cli.entry_point',
         ],
     },
 )

shlax/__init__.py

@@ -1,7 +0,0 @@
-from .actions import *
-from .image import Image
-from .strategies import *
-from .output import Output
-from .proc import Proc
-from .targets import *
-from .shlaxfile import Shlaxfile

shlax/actions/__init__.py

@@ -1,7 +0,0 @@
-from .copy import Copy
-from .packages import Packages  # noqa
-from .base import Action  # noqa
-from .htpasswd import Htpasswd
-from .run import Run  # noqa
-from .pip import Pip
-from .service import Service

shlax/actions/base.py

@@ -1,225 +1,2 @@
-from copy import deepcopy
-import functools
-import inspect
-import importlib
-import sys
-
-from ..output import Output
-from ..exceptions import WrongResult
-
-
 class Action:
-    parent = None
-    contextualize = []
-    regexps = {
-        r'([\w]+):': '{cyan}\\1{gray}:{reset}',
-        r'(^|\n)( *)\- ': '\\1\\2{red}-{reset} ',
-    }
-    options = dict(
-        debug=dict(
-            alias='d',
-            default='visit',
-            help='''
-            Display debug output. Supports values (combinable): cmd,out,visit
-            '''.strip(),
-            immediate=True,
-        ),
-    )
-
-    def __init__(self, *args, doc=None, **kwargs):
-        self.args = args
-        self.kwargs = kwargs
-        self.call_args = []
-        self.call_kwargs = {}
-        self._doc = doc
-        self.menu = {
-            name: value
-            for name, value in kwargs.items()
-            if isinstance(value, Action)
-        }
-
-    @property
-    def context(self):
-        if not self.parent:
-            if '_context' not in self.__dict__:
-                self._context = dict()
-            return self._context
-        else:
-            return self.parent.context
-
-    def actions_filter(self, results, f=None, **filters):
-        if f:
-            def ff(a):
-                try:
-                    return f(a)
-                except:
-                    return False
-            results = [*filter(ff, results)]
-
-        for k, v in filters.items():
-            if k == 'type':
-                results = [*filter(
-                    lambda s: type(s).__name__.lower() == str(v).lower(),
-                    results
-                )]
-            else:
-                results = [*filter(
-                    lambda s: getattr(s, k, None) == v,
-                    results
-                )]
-
-        return results
-
-
-    def sibblings(self, f=None, **filters):
-        if not self.parent:
-            return []
-        return self.actions_filter(
-            [a for a in self.parent.actions if a is not self],
-            f, **filters
-        )
-
-    def parents(self, f=None, **filters):
-        if self.parent:
-            return self.actions_filter(
-                [self.parent] + self.parent.parents(),
-                f, **filters
-            )
-        return []
-
-    def children(self, f=None, **filters):
-        children = []
-        def add(parent):
-            if parent != self:
-                children.append(parent)
-            if 'actions' not in parent.__dict__:
-                return
-
-            for action in parent.actions:
-                add(action)
-        add(self)
-        return self.actions_filter(children, f, **filters)
-
-    def __getattr__(self, name):
-        for a in self.parents() + self.sibblings() + self.children():
-            if name in a.contextualize:
-                return getattr(a, name)
-        raise AttributeError(f'{type(self).__name__} has no {name}')
-
-    async def call(self, *args, **kwargs):
-        print(f'{self}.call(*args, **kwargs) not implemented')
-        sys.exit(1)
-
-    def output_factory(self, *args, **kwargs):
-        kwargs.setdefault('regexps', self.regexps)
-        return Output(**kwargs)
-
-    async def __call__(self, *args, **kwargs):
-        self.call_args = list(self.call_args) + list(args)
-        self.call_kwargs.update(kwargs)
-        self.output = self.output_factory(*args, **kwargs)
-        self.output_start()
-        self.status = 'running'
-        try:
-            result = await self.call(*args, **kwargs)
-        except Exception as e:
-            self.output_fail(e)
-            self.status = 'fail'
-            proc = getattr(e, 'proc', None)
-            if proc:
-                result = proc.rc
-            else:
-                raise
-        else:
-            self.output_success()
-            if self.status == 'running':
-                self.status = 'success'
-        finally:
-            clean = getattr(self, 'clean', None)
-            if clean:
-                self.output.clean(self)
-                await clean(*args, **kwargs)
-        return result
-
-    def output_start(self):
-        if self.kwargs.get('quiet', False):
-            return
-        self.output.start(self)
-
-    def output_fail(self, exception=None):
-        if self.kwargs.get('quiet', False):
-            return
-        self.output.fail(self, exception)
-
-    def output_success(self):
-        if self.kwargs.get('quiet', False):
-            return
-        self.output.success(self)
-
-    def __repr__(self):
-        return ' '.join([type(self).__name__] + list(self.args) + [
-            f'{k}={v}'
-            for k, v in self.kwargs.items()
-        ])
-
-    def colorized(self):
-        return ' '.join([
-            self.output.colors['pink1']
-            + type(self).__name__
-            + self.output.colors['yellow']
-        ] + list(self.args) + [
-            f'{self.output.colors["blue"]}{k}{self.output.colors["gray"]}={self.output.colors["green2"]}{v}'
-            for k, v in self.kwargs_output().items()
-        ] + [self.output.colors['reset']])
-
-    def callable(self):
-        from ..targets import Localhost
-        async def cb(*a, **k):
-            from shlax.cli import cli
-            script = Localhost(self, quiet=True)
-            result = await script(*a, **k)
-
-            success = functools.reduce(
-                lambda a, b: a + b,
-                [1 for c in script.children() if c.status == 'success'] or [0])
-            if success:
-                script.output.success(f'{success} PASS')
-
-            failures = functools.reduce(
-                lambda a, b: a + b,
-                [1 for c in script.children() if c.status == 'fail'] or [0])
-            if failures:
-                script.output.fail(f'{failures} FAIL')
-            cli.exit_code = failures
-            return result
-        return cb
-
-    def kwargs_output(self):
-        return self.kwargs
-
-    def action(self, action, *args, **kwargs):
-        if isinstance(action, str):
-            import cli2
-            a = cli2.Callable.factory(action).target
-            if not a:
-                a = cli2.Callable.factory(
-                    '.'.join(['shlax', action])
-                ).target
-            if a:
-                action = a
-
-        p = action(*args, **kwargs)
-        for parent in self.parents():
-            if hasattr(parent, 'actions'):
-                break
-        p.parent = parent
-        if 'actions' not in self.__dict__:
-            # "mutate" to Strategy
-            from ..strategies.script import Actions
-            self.actions = Actions(self, [p])
-        return p
-
-    def bind(self, *args):
-        clone = deepcopy(self)
-        clone.call_args = args
-        return clone
+    pass

shlax/actions/copy.py

@@ -1,6 +1,71 @@
-from .base import Action
+import asyncio
+import binascii
+import glob
+import os
+
+from ..exceptions import ShlaxException
 
 
-class Copy(Action):
-    async def call(self, *args, **kwargs):
-        await self.copy(*self.args)
+class Copy:
+    def __init__(self, *args):
+        self.dst = args[-1]
+        self.src = []
+
+        for src in args[:-1]:
+            if '*' in src:
+                self.src += glob.glob(src)
+            else:
+                self.src.append(src)
+
+    async def listfiles(self, target):
+        if getattr(self, '_listfiles', None):
+            return self._listfiles
+
+        result = []
+        for src in self.src:
+            if not await target.parent.exists(src):
+                target.output.fail(self)
+                raise ShlaxException(f'File not found {src}')
+
+            if os.path.isfile(src):
+                result.append(src)
+                continue
+
+            for root, dirs, files in os.walk(src):
+                if '__pycache__' in root:
+                    continue
+                result += [
+                    os.path.join(root, f)
+                    for f in files
+                    if not f.endswith('.pyc')
+                ]
+        self._listfiles = result
+        return result
+
+    async def __call__(self, target):
+        await target.mkdir(self.dst)
+
+        for path in await self.listfiles(target):
+            if os.path.isdir(path):
+                await target.mkdir(os.path.join(self.dst, path))
+            elif '/' in path:
+                dirname = os.path.join(
+                    self.dst,
+                    '/'.join(path.split('/')[:-1])
+                )
+                await target.mkdir(dirname)
+                await target.copy(path, dirname)
+            else:
+                await target.copy(path, self.dst)
+
+    def __str__(self):
+        return f'Copy({", ".join(self.src)}, {self.dst})'
+
+    async def cachekey(self, target):
+        async def chksum(path):
+            with open(path, 'rb') as f:
+                return (path, str(binascii.crc32(f.read())))
+        results = await asyncio.gather(
+            *[chksum(f) for f in await self.listfiles(target)]
+        )
+        return {path: chks for path, chks in results}

shlax/actions/htpasswd.py

@@ -1,29 +0,0 @@
-import hashlib
-import secrets
-import string
-
-from .base import Action
-
-
-class Htpasswd(Action):
-    def __init__(self, path, user, *args, **kwargs):
-        self.path = path
-        self.user = user
-        super().__init__(*args, **kwargs)
-
-    async def call(self, *args, **kwargs):
-        found = False
-        htpasswd = await self.exec('cat', self.path, raises=False)
-        if htpasswd.rc == 0:
-            for line in htpasswd.out.split('\n'):
-                if line.startswith(self.user + ':'):
-                    found = True
-                    break
-
-        if not found:
-            self.password = ''.join(secrets.choice(
-                string.ascii_letters + string.digits
-            ) for i in range(20))
-            hashed = hashlib.sha1(self.password.encode('utf8'))
-            line = f'{self.user}:\\$sha1\\${hashed.hexdigest()}'
-            await self.exec(f'echo {line} >> {self.path}')

shlax/actions/packages.py

@@ -7,19 +7,16 @@ import os
 import subprocess
 from textwrap import dedent
 
-from .base import Action
 
-
-class Packages(Action):
+class Packages:
     """
-    The Packages visitor wraps around the container's package manager.
+    Package manager abstract layer with caching.
 
     It's a central piece of the build process, and does iterate over other
     container visitors in order to pick up packages. For example, the Pip
     visitor will declare ``self.packages = dict(apt=['python3-pip'])``, and the
     Packages visitor will pick it up.
     """
-    contextualize = ['mgr']
     regexps = {
         #r'Installing ([\w\d-]+)': '{cyan}\\1',
         r'Installing': '{cyan}lol',
@@ -30,88 +27,99 @@ class Packages(Action):
             update='apk update',
             upgrade='apk upgrade',
             install='apk add',
+            host=None,
         ),
         apt=dict(
             update='apt-get -y update',
             upgrade='apt-get -y upgrade',
             install='apt-get -y --no-install-recommends install',
+            host=None,
         ),
         pacman=dict(
             update='pacman -Sy',
             upgrade='pacman -Su --noconfirm',
             install='pacman -S --noconfirm',
+            lastupdate='stat -c %Y /var/lib/pacman/sync/core.db',
+            host='/var/lib/pacman',
         ),
         dnf=dict(
             update='dnf makecache --assumeyes',
             upgrade='dnf upgrade --best --assumeyes --skip-broken',  # noqa
             install='dnf install --setopt=install_weak_deps=False --best --assumeyes',  # noqa
+            lastupdate='stat -c %Y /var/cache/dnf/* | head -n1',
+            host=None,
         ),
         yum=dict(
             update='yum update',
             upgrade='yum upgrade',
             install='yum install',
+            host=None,
         ),
     )
 
     installed = []
 
-    def __init__(self, *packages, **kwargs):
+    def __init__(self, *packages, upgrade=False):
         self.packages = []
+        self.upgrade = upgrade
         for package in packages:
             line = dedent(package).strip().replace('\n', ' ')
             self.packages += line.split(' ')
-        super().__init__(*packages, **kwargs)
 
-    @property
-    def cache_root(self):
+    async def cache_setup(self, target):
+        # Try to use the host cache directory if present rather than home
+        # directory, in cases where host and guest are the same distros
+        hostpath = self.mgrs[self.mgr]['host']
+        if target.exists(hostpath):
+            self.cache_root = hostpath
+
         if 'CACHE_DIR' in os.environ:
-            return os.path.join(os.getenv('CACHE_DIR'))
+            self.cache_root = os.path.join(os.getenv('CACHE_DIR'))
         else:
-            return os.path.join(os.getenv('HOME'), '.cache')
+            self.cache_root = os.path.join(await target.parent.getenv('HOME'), '.cache')
 
-    async def update(self):
         # run pkgmgr_setup functions ie. apk_setup
-        cachedir = await getattr(self, self.mgr + '_setup')()
+        await getattr(self, self.mgr + '_setup')(target)
 
+    async def update(self, target):
+        # lastupdate = await target.exec(self.cmds['lastupdate'], raises=False)
+        # lastupdate = int(lastupdate.out) if lastupdate.rc == 0 else None
         lastupdate = None
-        if os.path.exists(cachedir + '/lastupdate'):
-            with open(cachedir + '/lastupdate', 'r') as f:
-                try:
-                    lastupdate = int(f.read().strip())
-                except:
-                    pass
-
-        if not os.path.exists(cachedir):
-            os.makedirs(cachedir)
-
         now = int(datetime.now().strftime('%s'))
-        # cache for a week
+        if not lastupdate or now - lastupdate > 604800:
+            await target.rexec(self.cmds['update'])
+
+        return
+
+        # disabling with the above return call until needed again
+        # might have to rewrite this to not have our own lockfile
+        # or find a better place on the filesystem
+        # also make sure the lockfile is actually needed when running on
+        # targets that don't have isguest=True
         if not lastupdate or now - lastupdate > 604800:
             # crude lockfile implementation, should work against *most*
             # race-conditions ...
             lockfile = cachedir + '/update.lock'
-            if not os.path.exists(lockfile):
-                with open(lockfile, 'w+') as f:
-                    f.write(str(os.getpid()))
+            if not await target.parent.exists(lockfile):
+                await target.parent.write(lockfile, str(os.getpid()))
 
                 try:
-                    await self.rexec(self.cmds['update'])
+                    await target.rexec(self.cmds['update'])
                 finally:
-                    os.unlink(lockfile)
+                    await target.parent.rm(lockfile)
 
-                with open(cachedir + '/lastupdate', 'w+') as f:
-                    f.write(str(now))
+                await target.parent.write(cachedir + '/lastupdate', str(now))
             else:
-                while os.path.exists(lockfile):
-                    print(f'{self.container.name} | Waiting for update ...')
+                while await target.parent.exists(lockfile):
+                    print(f'{self.target} | Waiting for {lockfile} ...')
                     await asyncio.sleep(1)
 
-    async def call(self, *args, **kwargs):
-        cached = getattr(self, '_pagkages_mgr', None)
+    async def __call__(self, target):
+        cached = getattr(target, 'pkgmgr', None)
         if cached:
             self.mgr = cached
         else:
-            mgr = await self.which(*self.mgrs.keys())
+            mgr = await target.which(*self.mgrs.keys())
             if mgr:
                 self.mgr = mgr[0].split('/')[-1]
 
@@ -119,11 +127,15 @@ class Packages(Action):
             raise Exception('Packages does not yet support this distro')
 
         self.cmds = self.mgrs[self.mgr]
-        if not getattr(self, '_packages_upgraded', None):
-            await self.update()
-            if self.kwargs.get('upgrade', True):
-                await self.rexec(self.cmds['upgrade'])
-            self._packages_upgraded = True
+
+        if target.isguest:
+            # we're going to mount
+            await self.cache_setup(target)
+
+        await self.update(target)
+
+        if self.upgrade:
+            await target.rexec(self.cmds['upgrade'])
 
         packages = []
         for package in self.packages:
@@ -136,35 +148,40 @@ class Packages(Action):
             else:
                 packages.append(package)
 
-        await self.rexec(*self.cmds['install'].split(' ') + packages)
+        await target.rexec(*self.cmds['install'].split(' ') + packages)
 
-    async def apk_setup(self):
+    async def apk_setup(self, target):
         cachedir = os.path.join(self.cache_root, self.mgr)
-        await self.mount(cachedir, '/var/cache/apk')
+        await target.mount(cachedir, '/var/cache/apk')
         # special step to enable apk cache
-        await self.rexec('ln -sf /var/cache/apk /etc/apk/cache')
+        await target.rexec('ln -sf /var/cache/apk /etc/apk/cache')
         return cachedir
 
-    async def dnf_setup(self):
+    async def dnf_setup(self, target):
         cachedir = os.path.join(self.cache_root, self.mgr)
-        await self.mount(cachedir, f'/var/cache/{self.mgr}')
-        await self.rexec('echo keepcache=True >> /etc/dnf/dnf.conf')
+        await target.mount(cachedir, f'/var/cache/{self.mgr}')
+        await target.rexec('echo keepcache=True >> /etc/dnf/dnf.conf')
         return cachedir
 
-    async def apt_setup(self):
-        codename = (await self.rexec(
-            f'source {self.mnt}/etc/os-release; echo $VERSION_CODENAME'
+    async def apt_setup(self, target):
+        codename = (await target.rexec(
+            f'source /etc/os-release; echo $VERSION_CODENAME'
         )).out
         cachedir = os.path.join(self.cache_root, self.mgr, codename)
         await self.rexec('rm /etc/apt/apt.conf.d/docker-clean')
         cache_archives = os.path.join(cachedir, 'archives')
-        await self.mount(cache_archives, f'/var/cache/apt/archives')
+        await target.mount(cache_archives, f'/var/cache/apt/archives')
         cache_lists = os.path.join(cachedir, 'lists')
-        await self.mount(cache_lists, f'/var/lib/apt/lists')
+        await target.mount(cache_lists, f'/var/lib/apt/lists')
         return cachedir
 
-    async def pacman_setup(self):
-        return self.cache_root + '/pacman'
+    async def pacman_setup(self, target):
+        cachedir = os.path.join(self.cache_root, self.mgr)
+        await target.mkdir(cachedir + '/cache', cachedir + '/sync')
+        await target.mount(cachedir + '/sync', '/var/lib/pacman/sync')
+        await target.mount(cachedir + '/cache', '/var/cache/pacman')
+        if await target.host.exists('/etc/pacman.d/mirrorlist'):
+            await target.copy('/etc/pacman.d/mirrorlist', '/etc/pacman.d/mirrorlist')
 
-    def __repr__(self):
-        return f'Packages({self.packages})'
+    def __str__(self):
+        return f'Packages({self.packages}, upgrade={self.upgrade})'

shlax/actions/parallel.py

@@ -0,0 +1,14 @@
+import asyncio
+
+
+class Parallel:
+    def __init__(self, *actions):
+        self.actions = actions
+
+    async def __call__(self, target):
+        return await asyncio.gather(*[
+            target(action) for action in self.actions
+        ])
+
+    def __str__(self):
+        return 'Parallel executor'

shlax/actions/pip.py

@@ -1,57 +1,72 @@
 from glob import glob
 import os
+from urllib import request
 
 from .base import Action
 
 
 class Pip(Action):
-    def __init__(self, *pip_packages, pip=None, requirements=None):
-        self.requirements = requirements
-        super().__init__(*pip_packages, pip=pip, requirements=requirements)
+    """Pip abstraction layer."""
+    def __init__(self, *pip_packages):
+        self.pip_packages = pip_packages
 
-    async def call(self, *args, **kwargs):
-        pip = self.kwargs.get('pip', None)
-        if not pip:
-            pip = await self.which('pip3', 'pip', 'pip2')
-            if pip:
-                pip = pip[0]
-            else:
-                from .packages import Packages
-                action = self.action(
-                    Packages,
-                    'python3,apk', 'python3-pip,apt',
-                    args=args, kwargs=kwargs
+    async def __call__(self, target):
+        # ensure python presence
+        results = await target.which('python3', 'python')
+        if results:
+            python = results[0]
+        else:
+            raise Exception('Could not find pip nor python')
+
+        # ensure pip module presence
+        result = await target.exec(
+            python, '-m', 'pip',
+            raises=False, quiet=True
+        )
+        if result.rc != 0:
+            if not os.path.exists('get-pip.py'):
+                req = request.urlopen(
+                    'https://bootstrap.pypa.io/get-pip.py'
                 )
-                await action(*args, **kwargs)
-                pip = await self.which('pip3', 'pip', 'pip2')
-                if not pip:
-                    raise Exception('Could not install a pip command')
-                else:
-                    pip = pip[0]
+                content = req.read()
+                with open('get-pip.py', 'wb+') as f:
+                    f.write(content)
 
+            await target.copy('get-pip.py', '.')
+            await target.exec(python, 'get-pip.py')
+
+        # choose a cache directory
         if 'CACHE_DIR' in os.environ:
             cache = os.path.join(os.getenv('CACHE_DIR'), 'pip')
         else:
             cache = os.path.join(os.getenv('HOME'), '.cache', 'pip')
 
-        if getattr(self, 'mount', None):
+        # and mount it
+        if getattr(target, 'mount', None):
             # we are in a target which shares a mount command
-            await self.mount(cache, '/root/.cache/pip')
-        await self.exec(f'{pip} install --upgrade pip')
+            await target.mount(cache, '/root/.cache/pip')
 
-        # https://github.com/pypa/pip/issues/5599
-        if 'pip' not in self.kwargs:
-            pip = 'python3 -m pip'
+        source = []
+        nonsource = []
+        for package in self.pip_packages:
+            if os.path.exists(package):
+                source.append(package)
+            else:
+                nonsource.append(package)
 
-        source = [p for p in self.args if p.startswith('/') or p.startswith('.')]
-        if source:
-            await self.exec(
-                f'{pip} install --upgrade --editable {" ".join(source)}'
+        if nonsource:
+            await target.exec(
+                python, '-m', 'pip',
+                'install', '--upgrade',
+                *nonsource
             )
 
-        nonsource = [p for p in self.args if not p.startswith('/')]
-        if nonsource:
-            await self.exec(f'{pip} install --upgrade {" ".join(nonsource)}')
+        if source:
+            await target.exec(
+                python, '-m', 'pip',
+                'install', '--upgrade', '--editable',
+                *source
+            )
 
-        if self.requirements:
-            await self.exec(f'{pip} install --upgrade -r {self.requirements}')
+    def __str__(self):
+        return f'Pip({", ".join(self.pip_packages)})'

shlax/actions/run.py

@@ -1,18 +1,15 @@
-from ..targets.buildah import Buildah
-from ..targets.docker import Docker
-
-from .base import Action
 
 
-class Run(Action):
-    async def call(self, *args, **kwargs):
-        image = self.kwargs.get('image', None)
-        if not image:
-            return await self.exec(*self.args, **self.kwargs)
-        if isinstance(image, Buildah):
-            breakpoint()
-            result = await self.action(image, *args, **kwargs)
+class Run:
+    def __init__(self, cmd, root=False):
+        self.cmd = cmd
+        self.root = root
 
-        return await Docker(
-            image=image,
-        ).exec(*args, **kwargs)
+    async def __call__(self, target):
+        if self.root:
+            self.proc = await target.rexec(self.cmd)
+        else:
+            self.proc = await target.exec(self.cmd)
+
+    def __str__(self):
+        return f'Run({self.cmd})'

shlax/actions/service.py

@@ -1,16 +0,0 @@
-import asyncio
-
-from .base import Action
-
-
-class Service(Action):
-    def __init__(self, *names, state=None):
-        self.state = state or 'started'
-        self.names = names
-        super().__init__()
-
-    async def call(self, *args, **kwargs):
-        return asyncio.gather(*[
-            self.exec('systemctl', 'start', name, user='root')
-            for name in self.names
-        ])

shlax/actions/user.py

@@ -0,0 +1,44 @@
+import os
+import re
+
+from .packages import Packages
+
+
+class User:
+    """
+    Create a user.
+
+    Example:
+
+        User('app', '/app', getenv('_CONTAINERS_ROOTLESS_UID', 1000)),
+
+    _CONTAINERS_ROOTLESS_UID allows to get your UID during build, which happens
+    in buildah unshare.
+    """
+    def __init__(self, username, home, uid):
+        self.username = username
+        self.home = home
+        self.uid = uid
+
+    def __str__(self):
+        return f'User({self.username}, {self.home}, {self.uid})'
+
+    async def __call__(self, target):
+        result = await target.rexec('id', self.uid, raises=False)
+        if result.rc == 0:
+            old = re.match('.*\(([^)]*)\).*', result.out).group(1)
+            await target.rexec(
+                'usermod',
+                '-d', self.home,
+                '-l', self.username,
+                old
+            )
+        else:
+            await target.rexec(
+                'useradd',
+                '-d', self.home,
+                '-u', self.uid,
+                self.username
+            )
+        await target.mkdir(self.home)
+        await target.rexec('chown', self.uid, self.home)

shlax/cli.py

@@ -1,86 +1,125 @@
-'''
-shlax is a micro-framework to orchestrate commands.
-
-  shlax yourfile.py: to list actions you have declared.
-  shlax yourfile.py <action>: to execute a given action
-  #!/usr/bin/env shlax: when making yourfile.py an executable.
-'''
-
+"""
+Shlax executes mostly in 3 ways:
+- Execute actions on targets with the command line
+- With your shlaxfile as first argument: offer defined Actions
+- With the name of a module in shlax.repo: a community maintained shlaxfile
+"""
+import ast
 import asyncio
 import cli2
-import copy
+import glob
 import inspect
 import importlib
-import glob
 import os
 import sys
 
-from .exceptions import *
-from .shlaxfile import Shlaxfile
-from .targets import Localhost
+from .exceptions import ShlaxException
 
 
-class ConsoleScript(cli2.ConsoleScript):
-    def __call__(self, *args, **kwargs):
-        self.shlaxfile = None
-        shlaxfile = sys.argv.pop(1) if len(sys.argv) > 1 else ''
-        if shlaxfile:
-            if not os.path.exists(shlaxfile):
-                try:    # missing shlaxfile, what are we gonna do !!
-                    mod = importlib.import_module('shlax.repo.' + shlaxfile)
-                except ImportError:
-                    print('Could not find ' + shlaxfile)
-                    self.exit_code = 1
-                    return
-                shlaxfile = mod.__file__
+class Group(cli2.Group):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.cmdclass = Command
 
-            self.shlaxfile = Shlaxfile()
-            self.shlaxfile.parse(shlaxfile)
-            self._doc = inspect.getdoc(mod)
-            if 'main' in self.shlaxfile.actions:
-                action = self.shlaxfile.actions['main']
-                for name, child in self.shlaxfile.actions['main'].menu.items():
-                    self[name] = cli2.Callable(
-                        name,
-                        child.callable(),
-                        options={
-                            k: cli2.Option(name=k, **v)
-                            for k, v in action.options.items()
-                        },
-                        color=getattr(action, 'color', cli2.YELLOW),
-                    )
-            for name, action in self.shlaxfile.actions.items():
-                self[name] = cli2.Callable(
-                    name,
-                    action.callable(),
-                    options={
-                        k: cli2.Option(name=k, **v)
-                        for k, v in action.options.items()
-                    },
-                    color=getattr(action, 'color', cli2.YELLOW),
-                    doc=inspect.getdoc(getattr(action, name, None)) or action._doc,
-                )
-        else:
-            from shlax import repo
-            path = repo.__path__._path[0]
-            for shlaxfile in glob.glob(os.path.join(path, '*.py')):
-                name = shlaxfile.split('/')[-1].split('.')[0]
-                mod = importlib.import_module('shlax.repo.' + name)
-                self[name] = cli2.Callable(name, mod)
 
-        return super().__call__(*args, **kwargs)
+class TargetArgument(cli2.Argument):
+    """
+    Target to execute on: localhost by default, target=@ssh_host for ssh.
+    """
+
+    def __init__(self, cmd, param, doc=None, color=None, default=None):
+        from shlax.targets.base import Target
+        super().__init__(cmd, param, doc=self.__doc__, default=Target())
+        self.alias = ['target', 't']
+
+    def cast(self, value):
+        from shlax.targets.ssh import Ssh
+        user, host = value.split('@')
+        return Ssh(host=host, user=user)
+
+    def match(self, arg):
+        return arg if isinstance(arg, str) and '@' in arg else None
+
+
+class Command(cli2.Command):
+    def setargs(self):
+        super().setargs()
+        if 'target' in self.sig.parameters:
+            self['target'] = TargetArgument(
+                self,
+                self.sig.parameters['target'],
+            )
+        if 'actions' in self:
+            del self['actions']
+
+    def __call__(self, *argv):
+        result = None
 
-    def call(self, command):
-        kwargs = copy.copy(self.parser.funckwargs)
-        kwargs.update(self.parser.options)
         try:
-            return command(*self.parser.funcargs, **kwargs)
-        except WrongResult as e:
-            print(e)
-            self.exit_code = e.proc.rc
-        except ShlaxException as e:
-            print(e)
+            result = super().__call__(*argv)
+        except ShlaxException as exc:
+            # just output the failure without TB, as command was already
+            # printed anyway
             self.exit_code = 1
+            self['target'].value.output.fail(exc)
+
+        if self['target'].value.results:
+            if self['target'].value.results[-1].status == 'failure':
+                self.exit_code = 1
+        self['target'].value.output.results(self['target'].value)
+        return result
 
 
-cli = ConsoleScript(__doc__).add_module('shlax.cli')
+class ActionCommand(cli2.Command):
+    def setargs(self):
+        super().setargs()
+        self['target'] = TargetArgument(
+            self,
+            inspect.Parameter('target', inspect.Parameter.KEYWORD_ONLY),
+        )
+
+    def call(self, *args, **kwargs):
+        self.target = self.target(*args, **kwargs)
+        return super().call(self['target'].value)
+
+
+class ConsoleScript(Group):
+    def __call__(self, *argv):
+        self.load_actions()
+        #self.load_shlaxfiles()  # wip
+        return super().__call__(*argv)
+
+    def load_shlaxfiles(self):
+        filesdir = os.path.dirname(__file__) + '/shlaxfiles/'
+        for filename in os.listdir(filesdir):
+            filepath = filesdir + filename
+            if not os.path.isfile(filepath):
+                continue
+
+            with open(filepath, 'r') as f:
+                tree = ast.parse(f.read())
+            group = self.group(filename[:-3])
+
+            main = Group(doc=__doc__).load(shlax)
+
+    def load_actions(self):
+        actionsdir = os.path.dirname(__file__) + '/actions/'
+        for filename in os.listdir(actionsdir):
+            filepath = actionsdir + filename
+            if not os.path.isfile(filepath):
+                continue
+            with open(filepath, 'r') as f:
+                tree = ast.parse(f.read())
+            cls = [
+                node
+                for node in tree.body
+                if isinstance(node, ast.ClassDef)
+            ]
+            if not cls:
+                continue
+            mod = importlib.import_module('shlax.actions.' + filename[:-3])
+            cls = getattr(mod, cls[0].name)
+            self.add(cls, name=filename[:-3], cmdclass=ActionCommand)
+
+
+cli = ConsoleScript(doc=__doc__)

shlax/container.py

@@ -0,0 +1,129 @@
+import copy
+import os
+
+from .podman import Podman
+from .image import Image
+
+
+class Container:
+    def __init__(self, build=None, image=None, env=None, volumes=None):
+        self.build = build
+        self.image = image or self.build.image
+        if isinstance(self.image, str):
+            self.image = Image(self.image)
+        self.volumes = volumes or {}
+        self.env = env or {}
+
+        prefix = os.getcwd().split('/')[-1]
+        repo = self.image.repository.replace('/', '-')
+        if prefix == repo:
+            self.name = repo
+        else:
+            self.name = '-'.join([prefix, repo])
+
+        self.pod = None
+
+    @property
+    def full_name(self):
+        if self.pod:
+            return '-'.join([self.pod.name, self.name])
+        return self.name
+
+    async def up(self, target, *args):
+        """Start the container foreground"""
+        podman = Podman(target)
+        if self.pod:
+            pod = None
+            for _ in await podman.pod.ps():
+                if _['Name'] == self.pod.name:
+                    pod = _
+                    break
+            if not pod:
+                await podman.pod.create('--name', self.pod.name)
+            args = list(args) + ['--pod', self.pod.name]
+
+        # skip if already up
+        for result in await podman.ps('-a'):
+            for name in result['Names']:
+                if name == self.full_name:
+                    if result['State'] == 'running':
+                        target.output.info(f'{self.full_name} already running')
+                        return
+                    elif result['State'] in ('exited', 'configured'):
+                        target.output.info(f'{self.full_name} starting')
+                        startargs = ['podman', 'start']
+                        if '-d' not in args:
+                            startargs.append('--attach')
+                        startargs.append(self.full_name)
+                        await target.exec(*startargs)
+                        return
+
+        cmd = [
+            'podman',
+            'run',
+        ] + list(args)
+
+        for src, dest in self.volumes.items():
+            cmd += ['--volume', ':'.join([src, dest])]
+
+        for src, dest in self.env.items():
+            cmd += ['--env', '='.join([src, str(dest)])]
+
+        cmd += [
+            '--name',
+            self.full_name,
+            str(self.image),
+        ]
+        await target.exec(*cmd)
+
+    async def start(self, target):
+        """Start the container background"""
+        await self.up(target, '-d')
+
+    async def stop(self, target):
+        """Start the container"""
+        await target.exec('podman', 'stop', self.full_name)
+
+    async def inspect(self, target):
+        """Inspect container"""
+        await target.exec('podman', 'inspect', self.full_name)
+
+    async def logs(self, target):
+        """Show container logs"""
+        await target.exec('podman', 'logs', self.full_name)
+
+    async def exec(self, target, cmd=None):
+        """Execute a command in the container"""
+        cmd = cmd or 'bash'
+        if cmd.endswith('sh'):
+            import os
+            os.execvp(
+                '/usr/bin/podman',
+                [
+                    'podman',
+                    'exec',
+                    '-it',
+                    self.full_name,
+                    cmd,
+                ]
+            )
+        result = await target.exec(
+            'podman',
+            'exec',
+            self.full_name,
+            cmd,
+        )
+
+    async def down(self, target):
+        """Start the container"""
+        await target.exec('podman', 'rm', '-f', self.full_name, raises=False)
+
+    async def apply(self, target):
+        """Start the container"""
+        if self.build:
+            await target(self.build)
+        await target(self.down)
+        await target(self.start)
+
+    def __str__(self):
+        return f'Container(name={self.name}, image={self.image}, volumes={self.volumes})'

shlax/contrib/gitlab.py

@@ -1,37 +0,0 @@
-from copy import deepcopy
-import yaml
-
-from shlax import *
-
-
-class GitLabCI(Script):
-    async def call(self, *args, write=True, **kwargs):
-        output = dict()
-        for key, value in self.kwargs.items():
-            if isinstance(value, dict):
-                output[key] = deepcopy(value)
-                image = output[key].get('image', 'alpine')
-                if hasattr(image, 'image'):
-                    output[key]['image'] = image.image.repository + ':$CI_COMMIT_SHORT_SHA'
-            else:
-                output[key] = value
-
-        output = yaml.dump(output)
-        if kwargs['debug'] is True:
-            self.output(output)
-        if write:
-            with open('.gitlab-ci.yml', 'w+') as f:
-                f.write(output)
-
-        from shlax.cli import cli
-        for arg in args:
-            job = self.kwargs[arg]
-            _args = []
-            if not isinstance(job['image'], str):
-                image = str(job['image'].image)
-            else:
-                image = job['image']
-            await self.action('Docker', Run(job['script']), image=image)(*_args, **kwargs)
-
-    def colorized(self):
-        return type(self).__name__

shlax/exceptions.py

@@ -1,22 +0,0 @@
-class ShlaxException(Exception):
-    pass
-
-
-class Mistake(ShlaxException):
-    pass
-
-
-class WrongResult(ShlaxException):
-    def __init__(self, proc):
-        self.proc = proc
-
-        msg = f'FAIL exit with {proc.rc} ' + proc.args[0]
-
-        if not proc.debug or 'cmd' not in str(proc.debug):
-            msg += '\n' + proc.cmd
-
-        if not proc.debug or 'out' not in str(proc.debug):
-            msg += '\n' + proc.out
-            msg += '\n' + proc.err
-
-        super().__init__(msg)

shlax/image.py

@@ -1,31 +1,52 @@
+import json
 import os
 import re
 
-class Image:
-    ENV_TAGS = (
-        # gitlab
-        'CI_COMMIT_SHORT_SHA',
-        'CI_COMMIT_REF_NAME',
-        'CI_COMMIT_TAG',
-        # CircleCI
-        'CIRCLE_SHA1',
-        'CIRCLE_TAG',
-        'CIRCLE_BRANCH',
-        # contributions welcome here
-    )
 
+class Layers(set):
+    def __init__(self, image):
+        self.image = image
+
+    async def ls(self, target):
+        """Fetch layers from localhost"""
+        ret = set()
+        results = await target.parent.exec(
+            'buildah images --json',
+            quiet=True,
+        )
+        results = json.loads(results.out)
+
+        prefix = 'localhost/' + self.image.repository + ':layer-'
+        for result in results:
+            if not result.get('names', None):
+                continue
+            for name in result['names']:
+                if name.startswith(prefix):
+                    self.add(name)
+        return self
+
+    async def rm(self, target, tags=None):
+        """Drop layers for this image"""
+        if tags is None:
+            tags = [layer for layer in await self.ls(target)]
+        await target.exec('podman', 'rmi', *tags, raises=False)
+
+
+class Image:
     PATTERN = re.compile(
         '^((?P<backend>[a-z]*)://)?((?P<registry>[^/]*[.][^/]*)/)?((?P<repository>[^:]+))?(:(?P<tags>.*))?$'  # noqa
         , re.I
     )
 
-    def __init__(self, arg=None, format=None, backend=None, registry=None, repository=None, tags=None):
+    def __init__(self, arg=None, format=None, backend=None, registry=None,
+                 repository=None, tags=None):
         self.arg = arg
         self.format = format
         self.backend = backend
         self.registry = registry
         self.repository = repository
         self.tags = tags or []
+        self.layers = Layers(self)
 
         match = re.match(self.PATTERN, arg)
         if match:
@@ -39,15 +60,11 @@ class Image:
                 setattr(self, k, v)
 
         # docker.io currently has issues with oci format
-        self.format = format or 'oci'
         if self.registry == 'docker.io':
-            self.format = 'docker'
+            self.backend = 'docker'
 
-        # figure tags from CI vars
-        for name in self.ENV_TAGS:
-            value = os.getenv(name)
-            if value:
-                self.tags.append(value)
+        if not self.format:
+            self.format = 'docker' if self.backend == 'docker' else 'oci'
 
         # filter out tags which resolved to None
         self.tags = [t for t in self.tags if t]
@@ -56,20 +73,22 @@ class Image:
         if not self.tags:
             self.tags = ['latest']
 
-    async def __call__(self, action, *args, **kwargs):
-        args = list(args)
-        return await action.exec(*args, **self.kwargs)
-
     def __str__(self):
         return f'{self.repository}:{self.tags[-1]}'
 
-    async def push(self, *args, **kwargs):
-        user = os.getenv('DOCKER_USER')
-        passwd = os.getenv('DOCKER_PASS')
-        action = kwargs.get('action', self)
+    async def push(self, target, name=None):
+        user = os.getenv('IMAGES_USER', os.getenv('DOCKER_USER'))
+        passwd = os.getenv('IMAGES_PASS', os.getenv('DOCKER_PASS'))
         if user and passwd:
-            action.output.cmd('buildah login -u ... -p ...' + self.registry)
-            await action.exec('buildah', 'login', '-u', user, '-p', passwd, self.registry or 'docker.io', debug=False)
+            target.output.cmd('buildah login -u ... -p ...' + self.registry)
+            await target.parent.exec(
+                'buildah', 'login', '-u', user, '-p', passwd,
+                self.registry or 'docker.io', quiet=True)
 
         for tag in self.tags:
-            await action.exec('buildah', 'push', f'{self.repository}:{tag}')
+            await target.parent.exec(
+                'buildah',
+                'push',
+                self.repository + ':final',
+                name if isinstance(name, str) else f'{self.registry}/{self.repository}:{tag}'
+            )

shlax/output.py

@@ -1,5 +1,6 @@
 import re
 import sys
+import types
 
 from .colors import colors
 
@@ -25,7 +26,23 @@ class Output:
     def colorize(self, code, content):
         return self.color(code) + content + self.color()
 
-    def __init__(self, prefix=None, regexps=None, debug=False, write=None, flush=None, **kwargs):
+    def colorized(self, action):
+        if hasattr(action, 'colorized'):
+            return action.colorized(self.colors)
+        elif isinstance(action, types.MethodType):
+            return f'{action.__self__}.{action.__name__}'
+        else:
+            return str(action)
+
+    def __init__(
+            self,
+            prefix=None,
+            regexps=None,
+            debug='cmd,visit,out',
+            write=None,
+            flush=None,
+            **kwargs
+        ):
         self.prefix = prefix
         self.debug = debug
         self.prefix_length = 0
@@ -84,7 +101,11 @@ class Output:
         )
 
     def highlight(self, line, highlight=True):
-        line = line.decode('utf8') if isinstance(line, bytes) else line
+        try:
+            line = line.decode('utf8') if isinstance(line, bytes) else line
+        except UnicodeDecodeError:
+            highlight = False
+
         if not highlight or (
             '\x1b[' in line
             or '\033[' in line
@@ -99,22 +120,21 @@ class Output:
         return line
 
     def test(self, action):
-        if self.debug is True:
-            self(''.join([
-                self.colors['purplebold'],
-                '!  TEST   ',
-                self.colors['reset'],
-                action.colorized(),
-                '\n',
-            ]))
+        self(''.join([
+            self.colors['purplebold'],
+            '! TEST    ',
+            self.colors['reset'],
+            self.colorized(action),
+            '\n',
+        ]))
 
     def clean(self, action):
-        if self.debug is True:
+        if self.debug:
             self(''.join([
                 self.colors['bluebold'],
-                '+  CLEAN  ',
+                '+ CLEAN   ',
                 self.colors['reset'],
-                action.colorized(),
+                self.colorized(action),
                 '\n',
             ]))
 
@@ -122,9 +142,29 @@ class Output:
         if self.debug is True or 'visit' in str(self.debug):
             self(''.join([
                 self.colors['orangebold'],
-                '⚠  START  ',
+                '⚠ START   ',
                 self.colors['reset'],
-                action.colorized(),
+                self.colorized(action),
+                '\n',
+            ]))
+
+    def info(self, text):
+        if self.debug is True or 'visit' in str(self.debug):
+            self(''.join([
+                self.colors['cyanbold'],
+                '➤ INFO    ',
+                self.colors['reset'],
+                text,
+                '\n',
+            ]))
+
+    def skip(self, action):
+        if self.debug is True or 'visit' in str(self.debug):
+            self(''.join([
+                self.colors['yellowbold'],
+                '↪️   SKIP  ',
+                self.colors['reset'],
+                self.colorized(action),
                 '\n',
             ]))
 
@@ -134,7 +174,7 @@ class Output:
                 self.colors['greenbold'],
                 '✔ SUCCESS ',
                 self.colors['reset'],
-                action.colorized() if hasattr(action, 'colorized') else str(action),
+                self.colorized(action),
                 '\n',
             ]))
 
@@ -144,6 +184,34 @@ class Output:
                 self.colors['redbold'],
                 '✘  FAIL   ',
                 self.colors['reset'],
-                action.colorized() if hasattr(action, 'colorized') else str(action),
+                self.colorized(action),
+                '\n',
+            ]))
+
+    def results(self, action):
+        if len(action.results) < 2:
+            return
+        success = 0
+        fail = 0
+        for result in action.results:
+            if result.status == 'success':
+                success += 1
+            if result.status == 'failure':
+                fail += 1
+
+        self(''.join([
+            self.colors['greenbold'],
+            '✔ SUCCESS REPORT: ',
+            self.colors['reset'],
+            str(success),
+            '\n',
+        ]))
+
+        if fail:
+            self(''.join([
+                self.colors['redbold'],
+                '✘  FAIL REPORT: ',
+                self.colors['reset'],
+                str(fail),
                 '\n',
             ]))

shlax/pod.py

@@ -0,0 +1,78 @@
+import cli2
+import json
+import os
+import sys
+
+from shlax.targets.base import Target
+from shlax.actions.parallel import Parallel
+from shlax.proc import Proc
+
+from .podman import Podman
+
+
+class Pod:
+    """Help text"""
+    def __init__(self, **containers):
+        self.containers = containers
+        for name, container in self.containers.items():
+            container.pod = self
+            container.name = name
+        self.name = os.getcwd().split('/')[-1]
+
+    async def _call(self, target, method, *names):
+        methods = [
+            getattr(container, method)
+            for name, container in self.containers.items()
+            if not names or name in names
+        ]
+        await target(Parallel(*methods))
+
+    async def build(self, target, *names):
+        """Build container images"""
+        if not (Proc.test or os.getuid() == 0):
+            os.execvp('buildah', ['buildah', 'unshare'] + sys.argv)
+        else:
+            await self._call(target, 'build', *names)
+
+    async def down(self, target, *names):
+        """Delete container images"""
+        await self._call(target, 'down', *names)
+
+    async def start(self, target, *names):
+        """Start container images"""
+        await self._call(target, 'start', *names)
+
+    async def logs(self, target, *names):
+        """Start container images"""
+        await self._call(target, 'logs', *names)
+
+    async def ps(self, target):
+        """Show containers and volumes"""
+        containers = []
+        names = []
+        for container in await Podman(target).ps('-a'):
+            for name in container['Names']:
+                if name.startswith(self.name + '-'):
+                    container['Name'] = name
+                    containers.append(container)
+                    names.append(name)
+
+        for name, container in self.containers.items():
+            full_name = '-'.join([self.name, container.name])
+            if full_name in names:
+                continue
+            containers.append(dict(
+                Name=full_name,
+                State='not created',
+            ))
+
+        cli2.Table(
+            ['Name', 'State'],
+            *[
+                (container['Name'], container['State'])
+                for container in containers
+            ]
+        ).print()
+
+    def __str__(self):
+        return f'Pod({self.name})'

shlax/podman.py

@@ -0,0 +1,20 @@
+import json
+
+
+class Podman(list):
+    def __init__(self, target, *args):
+        self.target = target
+        super().__init__(args or ['podman'])
+
+    def __getattr__(self, command):
+        if command.startswith('_'):
+            return super().__getattr__(command)
+        return Podman(self.target, *self + [command])
+
+    async def __call__(self, *args, **kwargs):
+        cmd = self + list(args) + [
+            f'--{k}={v}' for k, v in kwargs.items()
+        ]
+        if 'ps' in cmd:
+            cmd += ['--format=json']
+        return (await self.target.exec(*cmd, quiet=True)).json

shlax/proc.py

@@ -7,31 +7,47 @@ import os
 import shlex
 import sys
 
-from .exceptions import WrongResult
+from .exceptions import ShlaxException
 from .output import Output
 
 
+class ProcFailure(ShlaxException):
+    def __init__(self, proc):
+        self.proc = proc
+
+        msg = f'FAIL exit with {proc.rc} ' + proc.args[0]
+
+        if not proc.output.debug or 'cmd' not in str(proc.output.debug):
+            msg += '\n' + proc.cmd
+
+        if not proc.output.debug or 'out' not in str(proc.output.debug):
+            msg += '\n' + proc.out
+            msg += '\n' + proc.err
+
+        super().__init__(msg)
+
+
 class PrefixStreamProtocol(asyncio.subprocess.SubprocessStreamProtocol):
     """
     Internal subprocess stream protocol to add a prefix in front of output to
     make asynchronous output readable.
     """
 
-    def __init__(self, output, *args, **kwargs):
-        self.output = output
+    def __init__(self, proc, *args, **kwargs):
+        self.proc = proc
         super().__init__(*args, **kwargs)
 
     def pipe_data_received(self, fd, data):
-        if self.output.debug is True or 'out' in str(self.output.debug):
+        if self.proc.output.debug is True or 'out' in str(self.proc.output.debug):
             if fd in (1, 2):
-                self.output(data)
+                self.proc.output(data)
         super().pipe_data_received(fd, data)
 
 
-def protocol_factory(output):
+def protocol_factory(proc):
     def _p():
         return PrefixStreamProtocol(
-            output,
+            proc,
             limit=asyncio.streams._DEFAULT_LIMIT,
             loop=asyncio.events.get_event_loop()
         )
@@ -54,9 +70,11 @@ class Proc:
     """
     test = False
 
-    def __init__(self, *args, prefix=None, raises=True, debug=None, output=None):
-        self.debug = debug if not self.test else False
-        self.output = output or Output()
+    def __init__(self, *args, prefix=None, raises=True, output=None, quiet=False):
+        if quiet:
+            self.output = Output(debug=False)
+        else:
+            self.output = output or Output()
         self.cmd = ' '.join(args)
         self.args = args
         self.prefix = prefix
@@ -87,7 +105,7 @@ class Proc:
         if self.called:
             raise Exception('Already called: ' + self.cmd)
 
-        if self.debug is True or 'cmd' in str(self.debug):
+        if 'cmd' in str(self.output.debug):
             self.output.cmd(self.cmd)
 
         if self.test:
@@ -98,7 +116,7 @@ class Proc:
 
         loop = asyncio.events.get_event_loop()
         transport, protocol = await loop.subprocess_exec(
-            protocol_factory(self.output), *self.args)
+            protocol_factory(self), *self.args)
         self.proc = asyncio.subprocess.Process(transport, protocol, loop)
         self.called = True
 
@@ -123,7 +141,7 @@ class Proc:
         if not self.communicated:
             await self.communicate()
         if self.raises and self.proc.returncode:
-            raise WrongResult(self)
+            raise ProcFailure(self)
         return self
 
     @property

shlax/repo/traefik.py

@@ -1,41 +0,0 @@
-#!/usr/bin/env shlax
-"""
-Manage a traefik container maintained by Shlax community.
-"""
-
-from shlax import *
-
-main = Docker(
-    name='traefik',
-    image='traefik:v2.0.0',
-    networks=['web'],
-    command=[
-        '--entrypoints.web.address=:80',
-        '--providers.docker',
-        '--api',
-    ],
-    ports=[
-        '80:80',
-        '443:443',
-    ],
-    volumes=[
-        '/var/run/docker.sock:/var/run/docker.sock:ro',
-        '/etc/traefik/acme/:/etc/traefik/acme/',
-        '/etc/traefik/htpasswd:/htpasswd:ro',
-    ],
-    labels=[
-        'traefik.http.routers.traefik.rule=Host(`{{ url.split("/")[2] }}`)',
-        'traefik.http.routers.traefik.service=api@internal',
-        'traefik.http.routers.traefik.entrypoints=web',
-    ],
-    doc='Current traefik instance',
-)
-
-install = Script(
-    Htpasswd('./htpasswd', 'root'),
-    main.bind('up'),
-    doc='Deploy a Traefik instance',
-)
-
-up = main.bind('up')
-rm = main.bind('rm')

shlax/result.py

@@ -0,0 +1,13 @@
+class Result:
+    def __init__(self, target, action):
+        self.target = target
+        self.action = action
+        self.status = 'pending'
+        self.exception = None
+
+
+class Results(list):
+    def new(self, target, action):
+        result = Result(target, action)
+        self.append(result)
+        return result

shlax/shlaxfile.py

@@ -1,28 +0,0 @@
-import importlib
-import os
-
-from .actions.base import Action
-
-
-class Shlaxfile:
-    def __init__(self, actions=None, tests=None):
-        self.actions = actions or {}
-        self.tests = tests or {}
-        self.paths = []
-
-    def parse(self, path):
-        spec = importlib.util.spec_from_file_location('shlaxfile', path)
-        mod = importlib.util.module_from_spec(spec)
-        spec.loader.exec_module(mod)
-        for name, value in mod.__dict__.items():
-            if isinstance(value, Action):
-                value.name = name
-                self.actions[name] = value
-            elif callable(value) and getattr(value, '__name__', '').startswith('test_'):
-                self.tests[value.__name__] = value
-
-        self.paths.append(path)
-
-    @property
-    def path(self):
-        return self.paths[0]

shlax/shortcuts.py

@@ -0,0 +1,18 @@
+from .targets.base import Target
+from .targets.buildah import Buildah
+from .targets.localhost import Localhost
+from .targets.stub import Stub
+
+from .actions.copy import Copy
+from .actions.packages import Packages
+from .actions.run import Run
+from .actions.pip import Pip
+from .actions.parallel import Parallel
+from .actions.user import User
+
+from .cli import Command, Group
+
+from .container import Container
+from .pod import Pod
+
+from os import getenv, environ

shlax/strategies/__init__.py

@@ -1,3 +0,0 @@
-from .asyn import Async
-from .script import Script
-from .pod import Pod, Container

shlax/strategies/asyn.py

@@ -1,11 +0,0 @@
-import asyncio
-
-from .script import Script
-
-
-class Async(Script):
-    async def call(self, *args, **kwargs):
-        return await asyncio.gather(*[
-            action(*args, **kwargs)
-            for action in self.actions
-        ])

shlax/strategies/pod.py

@@ -1,44 +0,0 @@
-import os
-from .script import Script
-from ..image import Image
-
-
-class Container(Script):
-    """
-    Wolcome to crazy container control cli
-
-    Such wow
-    """
-    def __init__(self, *args, **kwargs):
-        kwargs.setdefault('start', dict())
-        super().__init__(*args, **kwargs)
-
-    async def call(self, *args, **kwargs):
-        if step('build'):
-            await self.kwargs['build'](**kwargs)
-            self.image = self.kwargs['build'].image
-        else:
-            self.image = kwargs.get('image', 'alpine')
-        if isinstance(self.image, str):
-            self.image = Image(self.image)
-
-        if step('install'):
-            await self.install(*args, **kwargs)
-
-        if step('test'):
-            self.output.test(self)
-            await self.action('Docker',
-                *self.kwargs['test'].actions,
-                image=self.image,
-                mount={'.': '/app'},
-                workdir='/app',
-            )(**kwargs)
-
-        if step('push'):
-            await self.image.push(action=self)
-
-        #name = kwargs.get('name', os.getcwd()).split('/')[-1]
-
-
-class Pod(Script):
-    pass

shlax/strategies/script.py

@@ -1,41 +0,0 @@
-import copy
-import os
-
-from ..exceptions import WrongResult
-from ..actions.base import Action
-from ..proc import Proc
-
-
-class Actions(list):
-    def __init__(self, owner, actions):
-        self.owner = owner
-        super().__init__()
-        for action in actions:
-            self.append(action)
-
-    def append(self, value):
-        action = copy.deepcopy(value)
-        action.parent = self.owner
-        action.status = 'pending'
-        super().append(action)
-
-
-class Script(Action):
-    contextualize = ['shargs', 'exec', 'rexec', 'env', 'which', 'copy']
-
-    def __init__(self, *actions, **kwargs):
-        self.home = kwargs.pop('home', os.getcwd())
-        super().__init__(**kwargs)
-        self.actions = Actions(self, actions)
-
-    async def call(self, *args, **kwargs):
-        for action in self.actions:
-            result = await action(*args, **kwargs)
-            if action.status != 'success':
-                break
-
-    def pollute(self, gbls):
-        for name, script in self.kwargs.items():
-            if not isinstance(script, Script):
-                continue
-            gbls[name] = script

shlax/targets/__init__.py

@@ -1,4 +0,0 @@
-from .buildah import Buildah
-from .docker import Docker
-from .localhost import Localhost
-from .ssh import Ssh

shlax/targets/base.py

@@ -0,0 +1,201 @@
+import asyncio
+import copy
+from pathlib import Path
+import os
+import re
+import sys
+
+from ..output import Output
+from ..proc import Proc, ProcFailure
+from ..result import Result, Results
+
+
+class Target:
+    isguest = False
+
+    def __init__(self, *actions, root=None):
+        self.actions = actions
+        self.results = []
+        self.output = Output()
+        self.parent = None
+        self.root = root or ''
+
+    def __str__(self):
+        return 'localhost'
+
+    @property
+    def parent(self):
+        return self._parent or Target()
+
+    @parent.setter
+    def parent(self, value):
+        self._parent = value
+
+    @property
+    def caller(self):
+        """Traverse parents and return the top-levels Target."""
+        if not self._parent:
+            return self
+        caller = self._parent
+        while caller._parent:
+            caller = caller._parent
+        return caller
+
+    async def __call__(self, *actions, target=None):
+        if target:
+            # that's going to be used by other target methods, to access
+            # the calling target
+            self.parent = target
+
+        result = Result(self, self)
+        result.status = 'success'
+
+        for action in actions or self.actions:
+            if await self.action(action, reraise=bool(actions)):
+                result.status = 'failure'
+                break
+
+        if getattr(self, 'clean', None):
+            self.output.clean(self)
+            await self.clean(self, result)
+
+    async def action(self, action, reraise=False):
+        result = Result(self, action)
+        self.output.start(action)
+        try:
+            await action(target=self)
+        except Exception as e:
+            self.output.fail(action, e)
+            result.status = 'failure'
+            result.exception = e
+
+            if not isinstance(e, ProcFailure):
+                # no need to reraise in case of command error
+                # because the command has been printed
+
+                if reraise:
+                    # nested call, re-raise
+                    raise
+                else:
+                    import traceback
+                    traceback.print_exception(type(e), e, sys.exc_info()[2])
+
+            return True  # because it failed
+        else:
+            if getattr(action, 'skipped', False):
+                self.output.skip(action)
+            else:
+                self.output.success(action)
+            result.status = 'success'
+        finally:
+            self.caller.results.append(result)
+
+            clean = getattr(action, 'clean', None)
+            if clean:
+                self.output.clean(action)
+                await clean(self, result)
+
+    async def rexec(self, *args, **kwargs):
+        kwargs['user'] = 'root'
+        return await self.exec(*args, **kwargs)
+
+    async def which(self, *cmd):
+        """
+        Return the first path to the cmd in the container.
+
+        If cmd argument is a list then it will try all commands.
+        """
+        proc = await self.exec('type ' + ' '.join(cmd), raises=False)
+        result = []
+        for res in proc.out.split('\n'):
+            match = re.match('([^ ]+) is ([^ ]+)$', res.strip())
+            if match:
+                result.append(match.group(1))
+        return result
+
+    def shargs(self, *args, **kwargs):
+        user = kwargs.pop('user', None)
+        args = [str(arg) for arg in args if args is not None]
+
+        if args and ' ' in args[0]:
+            if len(args) == 1:
+                args = ['sh', '-euc', args[0]]
+            else:
+                args = ['sh', '-euc'] + list(args)
+
+        if user == 'root':
+            args = ['sudo'] + args
+        elif user:
+            args = ['sudo', '-u', user] + args
+
+        return args, kwargs
+
+        if self.parent:
+            return self.parent.shargs(*args, **kwargs)
+        else:
+            return args, kwargs
+
+    async def exec(self, *args, **kwargs):
+        kwargs['output'] = self.output
+        args, kwargs = self.shargs(*args, **kwargs)
+        proc = await Proc(*args, **kwargs)()
+        if kwargs.get('wait', True):
+            await proc.wait()
+        return proc
+
+    @property
+    def root(self):
+        return self._root
+
+    @root.setter
+    def root(self, value):
+        self._root = Path(value) if value else ''
+
+    @property
+    def host(self):
+        current = self
+        while current.isguest:
+            current = self.parent
+        return current
+
+    def path(self, path):
+        if not self.root:
+            return path
+        if str(path).startswith('/'):
+            path = str(path)[1:]
+        return str(self.root / path)
+
+    async def mkdir(self, *paths):
+        if '_mkdir' not in self.__dict__:
+            self._mkdir = []
+
+        make = [str(path) for path in paths if str(path) not in self._mkdir]
+        if make:
+            await self.exec('mkdir', '-p', *make)
+            self._mkdir += make
+
+    async def copy(self, *args):
+        return await self.exec('cp', '-a', *args)
+
+    async def exists(self, path):
+        return (await self.exec('ls ' + self.path(path), raises=False)).rc == 0
+
+    async def read(self, path):
+        return (await self.exec('cat', self.path(path))).out
+
+    async def write(self, path, content, **kwargs):
+        return await self.exec(
+            f'cat > {self.path(path)} <<EOF\n'
+            + content
+            + '\nEOF',
+            **kwargs
+        )
+
+    async def rm(self, path):
+        return await self.exec('rm', self.path(path))
+
+    async def getenv(self, key):
+        return (await self.exec('echo $' + key)).out
+
+    async def getcwd(self):
+        return (await self.exec('pwd')).out

shlax/targets/buildah.py

@@ -1,156 +1,231 @@
 import asyncio
+import copy
+import hashlib
+import json
 import os
-import asyncio
-from pathlib import Path
-import signal
-import shlex
-import subprocess
 import sys
-import textwrap
+from pathlib import Path
+
+from .base import Target
 
-from ..actions.base import Action
-from ..exceptions import Mistake
-from ..proc import Proc
 from ..image import Image
-from .localhost import Localhost
+from ..proc import Proc
 
 
-class Buildah(Localhost):
-    """
-    The build script iterates over visitors and runs the build functions, it
-    also provides wrappers around the buildah command.
-    """
-    contextualize = Localhost.contextualize + ['mnt', 'ctr', 'mount', 'image']
+class Buildah(Target):
+    """Build container image with buildah"""
+    isguest = True
 
-    def __init__(self, base, *args, commit=None, push=False, cmd=None, **kwargs):
-        if isinstance(base, Action):
-            args = [base] + list(args)
-            base = 'alpine'  # default selection in case of mistake
-        super().__init__(*args, **kwargs)
-        self.base = base
-        self.mounts = dict()
-        self.ctr = None
-        self.mnt = None
+    def __init__(self, *actions, base=None, commit=None):
+        self.base = base or 'alpine'
         self.image = Image(commit) if commit else None
-        self.config= dict(
-            cmd=cmd or 'sh',
-        )
 
-    def shargs(self, *args, user=None, buildah=True, **kwargs):
-        if not buildah or args[0].startswith('buildah'):
-            return super().shargs(*args, user=user, **kwargs)
+        self.ctr = None
+        self.root = None
+        self.mounts = dict()
 
+        # Always consider localhost as parent for now
+        self.parent = Target()
+
+        super().__init__(*actions)
+
+    def is_runnable(self):
+        return Proc.test or os.getuid() == 0
+
+    def __str__(self):
+        if not self.is_runnable():
+            return 'Replacing with: buildah unshare ' + ' '.join(sys.argv)
+        return f'Buildah({self.image})'
+
+    async def __call__(self, *actions, target=None, push: str=False):
+        if target:
+            self.parent = target
+
+        self.push = push
+
+        if not self.is_runnable():
+            os.execvp('buildah', ['buildah', 'unshare'] + sys.argv)
+            return  # process has been replaced
+
+        layers = await self.image.layers.ls(self)
+        keep = await self.cache_setup(self.image.layers, *actions)
+        keepnames = [*map(lambda x: 'localhost/' + str(x), keep)]
+        self.invalidate = [name for name in self.image.layers if name not in keepnames]
+        if self.invalidate:
+            self.output.info('Invalidating old layers')
+            await self.image.layers.rm(self.parent, self.invalidate)
+
+        if actions:
+            actions = actions[len(keep):]
+        else:
+            self.actions = self.actions[len(keep):]
+
+        self.ctr = (await self.parent.exec('buildah', 'from', self.base)).out
+        self.root = Path((await self.parent.exec('buildah', 'mount', self.ctr)).out)
+
+        return await super().__call__(*actions)
+
+    async def cache_setup(self, layers, *actions):
+        keep = []
+        self.image_previous = Image(self.base)
+        for action in actions or self.actions:
+            action_image = await self.action_image(action)
+            name = 'localhost/' + str(action_image)
+            if name in layers:
+                self.base = self.image_previous = action_image
+                keep.append(action_image)
+                self.output.skip(
+                    f'Found layer for {action}: {action_image.tags[0]}'
+                )
+            else:
+                break
+        return keep
+
+    async def action_image(self, action):
+        prefix = str(self.image_previous)
+        for tag in self.image_previous.tags:
+            if tag.startswith('layer-'):
+                prefix = tag
+                break
+        if hasattr(action, 'cachekey'):
+            action_key = action.cachekey(self)
+            if asyncio.iscoroutine(action_key):
+                action_key = str(await action_key)
+        else:
+            action_key = str(action)
+        key = prefix + action_key
+        sha1 = hashlib.sha1(key.encode('ascii'))
+        action_image = copy.deepcopy(self.image)
+        action_image.tags = ['layer-' + sha1.hexdigest()]
+        return action_image
+
+    async def action(self, action, reraise=False):
+        stop = await super().action(action, reraise)
+        if not stop:
+            action_image = await self.action_image(action)
+            self.output.info(f'Commiting {action_image} for {action}')
+            await self.parent.exec(
+                'buildah',
+                'commit',
+                self.ctr,
+                action_image,
+            )
+            self.image_previous = action_image
+        return stop
+
+    async def clean(self, target, result):
+        if self.ctr is not None:
+            for src, dst in self.mounts.items():
+                await self.parent.exec('umount', self.root / str(dst)[1:])
+            await self.parent.exec('buildah', 'umount', self.ctr)
+
+        if result.status == 'success' and self.ctr:
+            await self.commit()
+            if self.push:
+                await self.image.push(target, self.push)
+
+        if self.ctr is not None:
+            await self.parent.exec('buildah', 'rm', self.ctr)
+
+    async def mount(self, src, dst):
+        """Mount a host directory into the container."""
+        target = self.root / str(dst)[1:]
+        await self.parent.exec(f'mkdir -p {src} {target}')
+        await self.parent.exec(f'mount -o bind {src} {target}')
+        self.mounts[src] = dst
+
+    async def exec(self, *args, user=None, **kwargs):
         _args = ['buildah', 'run']
         if user:
             _args += ['--user', user]
         _args += [self.ctr, '--', 'sh', '-euc']
-        return super().shargs(
-            *(
-                _args
-                + [' '.join([str(a) for a in args])]
-            ),
-            **kwargs
-        )
-
-    def __repr__(self):
-        return f'Base({self.base})'
-
-    async def config(self, line):
-        """Run buildah config."""
-        return await self.exec(f'buildah config {line} {self.ctr}', buildah=False)
-
-    async def copy(self, *args):
-        """Run buildah copy to copy a file from host into container."""
-        src = args[:-1]
-        dst = args[-1]
-        await self.mkdir(dst)
-
-        procs = []
-        for s in src:
-            if Path(s).is_dir():
-                target = self.mnt / s
-                if not target.exists():
-                    await self.mkdir(target)
-                args = ['buildah', 'copy', self.ctr, s, Path(dst) / s]
-            else:
-                args = ['buildah', 'copy', self.ctr, s, dst]
-            procs.append(self.exec(*args, buildah=False))
-
-        return await asyncio.gather(*procs)
-
-    async def mount(self, src, dst):
-        """Mount a host directory into the container."""
-        target = self.mnt / str(dst)[1:]
-        await self.exec(f'mkdir -p {src} {target}', buildah=False)
-        await self.exec(f'mount -o bind {src} {target}', buildah=False)
-        self.mounts[src] = dst
-
-    def is_runnable(self):
-        return (
-            Proc.test
-            or os.getuid() == 0
-        )
-
-    async def call(self, *args, **kwargs):
-        if self.is_runnable():
-            self.ctr = (await self.exec('buildah', 'from', self.base, buildah=False)).out
-            self.mnt = Path((await self.exec('buildah', 'mount', self.ctr, buildah=False)).out)
-            result = await super().call(*args, **kwargs)
-            return result
-
-        from shlax.cli import cli
-        debug = kwargs.get('debug', False)
-        # restart under buildah unshare environment
-        argv = [
-            'buildah', 'unshare',
-            sys.argv[0],  # current script location
-            cli.shlaxfile.path,  # current shlaxfile location
-        ]
-        if debug is True:
-            argv.append('-d')
-        elif isinstance(debug, str) and debug:
-            argv.append('-d=' + debug)
-        argv += [
-            cli.parser.command.name,  # script name ?
-        ]
-
-        await self.exec(*argv)
+        _args += [' '.join([str(a) for a in args])]
+        return await self.parent.exec(*_args, **kwargs)
 
     async def commit(self):
-        if not self.image:
-            return
-
-        for key, value in self.config.items():
-            await self.exec(f'buildah config --{key} "{value}" {self.ctr}')
-
-        self.sha = (await self.exec(
+        await self.parent.exec(
             'buildah',
             'commit',
-            '--format=' + self.image.format,
+            f'--format={self.image.format}',
             self.ctr,
-            buildah=False,
-        )).out
+            f'{self.image.repository}:final',
+        )
+        if self.image.backend == 'docker':
+            await self.parent.exec(
+                'buildah',
+                'push',
+                f'{self.image.repository}:final',
+                f'docker-daemon:{self.image.repository}:latest'
+            )
+
+        ENV_TAGS = (
+            # gitlab
+            'CI_COMMIT_SHORT_SHA',
+            'CI_COMMIT_REF_NAME',
+            'CI_COMMIT_TAG',
+            # CircleCI
+            'CIRCLE_SHA1',
+            'CIRCLE_TAG',
+            'CIRCLE_BRANCH',
+            # contributions welcome here
+        )
+
+        # figure tags from CI vars
+        for name in ENV_TAGS:
+            value = os.getenv(name)
+            if value:
+                self.image.tags.append(value)
 
         if self.image.tags:
             tags = [f'{self.image.repository}:{tag}' for tag in self.image.tags]
         else:
             tags = [self.image.repository]
 
-        for tag in tags:
-            await self.exec('buildah', 'tag', self.sha, tag, buildah=False)
+        await self.parent.exec('buildah', 'tag', self.image.repository + ':final', *tags)
 
-    async def clean(self, *args, **kwargs):
-        if self.is_runnable():
-            for src, dst in self.mounts.items():
-                await self.exec('umount', self.mnt / str(dst)[1:], buildah=False)
+    async def mkdir(self, *paths):
+        return await self.parent.mkdir(*[self.path(path) for path in paths])
 
-            if self.status == 'success':
-                await self.commit()
-                if 'push' in args:
-                    await self.image.push(action=self)
+    async def copy(self, *args):
+        return await self.parent.exec('buildah', 'copy', self.ctr, *args)
 
-            if self.mnt is not None:
-                await self.exec('buildah', 'umount', self.ctr, buildah=False)
+    async def write(self, path, content):
+        return await self.write(path, content)
 
-            if self.ctr is not None:
-                await self.exec('buildah', 'rm', self.ctr, buildah=False)
+    async def write(self, path, content, **kwargs):
+        return await self.exec(
+            f'cat > {path} <<EOF\n'
+            + content
+            + '\nEOF',
+            **kwargs
+        )
+
+    class Config:
+        def __init__(self, **config):
+            self.config = config
+
+        async def __call__(self, target):
+            for key, value in self.config.items():
+                await target.parent.exec(
+                    f'buildah config --{key} "{value}" {target.ctr}'
+                )
+
+        def __str__(self):
+            return f'Buildah.Config({self.config})'
+
+    class Env:
+        def __init__(self, **env):
+            self.env = env
+
+        async def __call__(self, target):
+            for key, value in self.env.items():
+                await target.parent.exec(
+                    'buildah',
+                    'config',
+                    '--env',
+                    f'{key}={value}',
+                    target.ctr,
+                )
+
+        def __str__(self):
+            return f'Buildah.Env({self.env})'

shlax/targets/docker.py

@@ -1,99 +0,0 @@
-import asyncio
-from pathlib import Path
-import os
-
-from ..image import Image
-from .localhost import Localhost
-
-
-class Docker(Localhost):
-    contextualize = Localhost.contextualize + ['mnt', 'ctr', 'mount']
-
-    def __init__(self, *args, **kwargs):
-        self.image = kwargs.get('image', 'alpine')
-        self.name = kwargs.get('name', os.getcwd().split('/')[-1])
-
-        if not isinstance(self.image, Image):
-            self.image = Image(self.image)
-
-        super().__init__(*args, **kwargs)
-
-    def shargs(self, *args, daemon=False, **kwargs):
-        if args[0] == 'docker':
-            return args, kwargs
-
-        extra = []
-        if 'user' in kwargs:
-            extra += ['--user', kwargs.pop('user')]
-
-        args, kwargs = super().shargs(*args, **kwargs)
-
-        if self.name:
-            executor = 'exec'
-            extra = [self.name]
-            return [self.kwargs.get('docker', 'docker'), executor, '-t'] + extra + list(args), kwargs
-
-        executor = 'run'
-        cwd = os.getcwd()
-        if daemon:
-            extra += ['-d']
-        extra = extra + ['-v', f'{cwd}:{cwd}', '-w', f'{cwd}']
-        return [self.kwargs.get('docker', 'docker'), executor, '-t'] + extra + [str(self.image)] + list(args), kwargs
-
-    async def call(self, *args, **kwargs):
-        def step(step):
-            return not args or step in args
-
-        # self.name = (
-        #     await self.exec(
-        #         'docker', 'ps', '-aq', '--filter',
-        #         'name=' + self.name,
-        #         raises=False
-        #     )
-        # ).out.split('\n')[0]
-
-        if step('rm'):
-            await self.rm(*args, **kwargs)
-
-        if step('down') and self.name:
-            await self.exec('docker', 'down', '-f', self.name)
-
-        if step('up'):
-            await self.up(*args, **kwargs)
-        return await super().call(*args, **kwargs)
-
-    async def rm(self, *args, **kwargs):
-        return await self.exec('docker', 'rm', '-f', self.name)
-
-    async def down(self, *args, **kwargs):
-        """Remove instance, except persistent data if any"""
-        if self.name:
-            self.name = (await self.exec('docker', 'start', self.name)).out
-        else:
-            self.name = (await self.exec('docker', 'run', '-d', '--name', self.name)).out
-
-    async def up(self, *args, **kwargs):
-        """Perform start or run"""
-        if self.name:
-            self.name = (await self.exec('docker', 'start', self.name)).out
-        else:
-            self.id = (await self.exec('docker', 'run', '-d', '--name', self.name)).out
-
-    async def copy(self, *args):
-        src = args[:-1]
-        dst = args[-1]
-        await self.mkdir(dst)
-
-        procs = []
-        for s in src:
-            '''
-            if Path(s).is_dir():
-                await self.mkdir(s)
-                args = ['docker', 'copy', self.ctr, s, Path(dst) / s]
-            else:
-                args = ['docker', 'copy', self.ctr, s, dst]
-            '''
-            args = ['docker', 'cp', s, self.name + ':' + dst]
-            procs.append(self.exec(*args))
-
-        return await asyncio.gather(*procs)

shlax/targets/localhost.py

@@ -1,19 +1,14 @@
-import os
+import copy
 import re
 
-from shlax.proc import Proc
+from ..output import Output
+from ..proc import Proc
+from ..result import Result, Results
 
-from ..strategies.script import Script
+from .base import Target
 
 
-class Localhost(Script):
-    root = '/'
-    contextualize = Script.contextualize + ['home']
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.home = kwargs.pop('home', os.getcwd())
-
+class Localhost(Target):
     def shargs(self, *args, **kwargs):
         user = kwargs.pop('user', None)
         args = [str(arg) for arg in args if args is not None]
@@ -29,54 +24,17 @@ class Localhost(Script):
         elif user:
             args = ['sudo', '-u', user] + args
 
+        return args, kwargs
+
         if self.parent:
             return self.parent.shargs(*args, **kwargs)
         else:
             return args, kwargs
 
     async def exec(self, *args, **kwargs):
-        if 'debug' not in kwargs:
-            kwargs['debug'] = getattr(self, 'call_kwargs', {}).get('debug', False)
-        kwargs.setdefault('output', self.output)
+        kwargs['output'] = self.output
         args, kwargs = self.shargs(*args, **kwargs)
         proc = await Proc(*args, **kwargs)()
         if kwargs.get('wait', True):
             await proc.wait()
         return proc
-
-    async def rexec(self, *args, **kwargs):
-        kwargs['user'] = 'root'
-        return await self.exec(*args, **kwargs)
-
-    async def env(self, name):
-        return (await self.exec('echo $' + name)).out
-
-    async def exists(self, *paths):
-        proc = await self.exec('type ' + ' '.join(cmd), raises=False)
-
-    async def which(self, *cmd):
-        """
-        Return the first path to the cmd in the container.
-
-        If cmd argument is a list then it will try all commands.
-        """
-        proc = await self.exec('type ' + ' '.join(cmd), raises=False)
-        result = []
-        for res in proc.out.split('\n'):
-            match = re.match('([^ ]+) is ([^ ]+)$', res.strip())
-            if match:
-                result.append(match.group(1))
-        return result
-
-    async def copy(self, *args):
-        if args[-1].startswith('./'):
-            args = list(args)
-            args[-1] = self.home + '/' + args[-1][2:]
-        args = ['cp', '-rua'] + list(args)
-        return await self.exec(*args)
-
-    async def mount(self, *dirs):
-        pass
-
-    async def mkdir(self, *dirs):
-        return await self.exec(*['mkdir', '-p'] + list(dirs))

shlax/targets/ssh.py

@@ -1,17 +1,15 @@
-import os
-
-from shlax.proc import Proc
-
-from .localhost import Localhost
+from .base import Target
 
 
-class Ssh(Localhost):
-    root = '/'
-
-    def __init__(self, host, *args, **kwargs):
+class Ssh(Target):
+    def __init__(self, *actions, host, user=None):
         self.host = host
-        super().__init__(*args, **kwargs)
+        self.user = user
+        super().__init__(*actions)
 
-    def shargs(self, *args, **kwargs):
-        args, kwargs = super().shargs(*args, **kwargs)
-        return (['ssh', self.host] + list(args)), kwargs
+    async def exec(self, *args, user=None, **kwargs):
+        _args = ['ssh', self.host]
+        if user == 'root':
+            _args += ['sudo']
+        _args += [' '.join([str(a) for a in args])]
+        return await self.parent.exec(*_args, **kwargs)

shlax/targets/stub.py

@@ -0,0 +1,23 @@
+from ..proc import Proc
+
+from .base import Target
+
+
+class ProcStub(Proc):
+    async def __call__(self, wait=True):
+        return self
+
+    async def communicate(self):
+        self.communicated = True
+        return self
+
+    async def wait(self):
+        return self
+
+
+class Stub(Target):
+    async def exec(self, *args, **kwargs):
+        proc = await ProcStub(*args, **kwargs)()
+        if kwargs.get('wait', True):
+            await proc.wait()
+        return proc

shlaxfile.py

@@ -1,55 +1,20 @@
-#!/usr/bin/env shlax
-from shlax.contrib.gitlab import *
+#!/usr/bin/env python
+"""
+Shlaxfile for shlax itself.
+"""
 
-PYTEST = 'py.test -svv tests'
-
-test = Script(
-    Pip('.[test]'),
-    Run(PYTEST),
-)
-
-build = Buildah(
-    'quay.io/podman/stable',
-    Packages('python38', 'buildah', 'unzip', 'findutils', 'python3-yaml', upgrade=False),
-    Async(
-        # python3.8 on centos with pip dance ...
-        Run('''
-        curl -o setuptools.zip https://files.pythonhosted.org/packages/42/3e/2464120172859e5d103e5500315fb5555b1e908c0dacc73d80d35a9480ca/setuptools-45.1.0.zip
-        unzip setuptools.zip
-        mkdir -p /usr/local/lib/python3.8/site-packages/
-        sh -c "cd setuptools-* && python3.8 setup.py install"
-        easy_install-3.8 pip
-        echo python3.8 -m pip > /usr/bin/pip
-        chmod +x /usr/bin/pip
-        '''),
-        Copy('shlax/', 'setup.py', '/app'),
-    ),
-    Pip('/app[full]'),
-    commit='docker.io/yourlabs/shlax',
-    workdir='/app',
-)
+from shlax.shortcuts import *
 
 shlax = Container(
-    build=build,
-    test=Script(Run('./shlaxfile.py -d test')),
+    build=Buildah(
+        Packages('python38', 'buildah', 'unzip', 'findutils', upgrade=False),
+        Copy('setup.py', 'shlax', '/app'),
+        Pip('/app[cli]'),
+        base='quay.io/buildah/stable',
+        commit='docker://docker.io/yourlabs/shlax',
+    ),
 )
 
-gitlabci = GitLabCI(
-    test=dict(
-        stage='build',
-        script='pip install -U --user -e .[test] && ' + PYTEST,
-        image='yourlabs/python',
-    ),
-    build=dict(
-        stage='build',
-        image='yourlabs/shlax',
-        script='pip install -U --user -e . && CACHE_DIR=$(pwd)/.cache ./shlaxfile.py -d shlax build push',
-        cache=dict(paths=['.cache'], key='cache'),
-    ),
-    pypi=dict(
-        stage='deploy',
-        only=['tags'],
-        image='yourlabs/python',
-        script='pypi-release',
-    ),
-)
+
+if __name__ == '__main__':
+    print(Group(doc=__doc__).load(shlax).entry_point())

tests/actions/test_base.py

@@ -1,53 +0,0 @@
-from shlax import *
-
-inner = Run()
-other = Run('ls')
-middle = Buildah('alpine', inner, other)
-outer = Localhost(middle)
-middle = outer.actions[0]
-other = middle.actions[1]
-inner = middle.actions[0]
-
-
-def test_action_init_args():
-    assert other.args == ('ls',)
-
-
-def test_action_parent_autoset():
-    assert list(outer.actions) == [middle]
-    assert middle.parent == outer
-    assert inner.parent == middle
-    assert other.parent == middle
-
-
-def test_action_context():
-    assert outer.context is inner.context
-    assert middle.context is inner.context
-    assert middle.context is outer.context
-    assert other.context is outer.context
-
-
-def test_action_sibblings():
-    assert inner.sibblings() == [other]
-    assert inner.sibblings(lambda s: s.args[0] == 'ls') == [other]
-    assert inner.sibblings(lambda s: s.args[0] == 'foo') == []
-    assert inner.sibblings(type='run') == [other]
-    assert inner.sibblings(args=('ls',)) == [other]
-
-
-def test_actions_parents():
-    assert other.parents() == [middle, outer]
-    assert other.parents(lambda p: p.base == 'alpine') == [middle]
-    assert inner.parents(type='localhost') == [outer]
-    assert inner.parents(type='buildah') == [middle]
-
-
-def test_action_childrens():
-    assert middle.children() == [inner, other]
-    assert middle.children(lambda a: a.args[0] == 'ls') == [other]
-    assert outer.children() == [middle, inner, other]
-
-
-def test_action_getattr():
-    assert other.exec == middle.exec
-    assert other.shargs == middle.shargs

tests/shlaxfail.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+"""
+Shlaxfile for shlax itself.
+"""
+
+from shlax.shortcuts import *
+
+shlax = Container(
+    build=Buildah(
+        Packages('prout', upgrade=False),
+        base='alpine',
+        commit='shlaxfail',
+    ),
+)
+
+
+if __name__ == '__main__':
+    print(Group(doc=__doc__).load(shlax).entry_point())

tests/shlaxsuccess.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+"""
+Shlaxfile for shlax itself.
+"""
+
+from shlax.shortcuts import *
+
+shlax = Container(
+    build=Buildah(
+        base='alpine',
+        commit='shlaxsuccess',
+    ),
+)
+
+
+if __name__ == '__main__':
+    print(Group(doc=__doc__).load(shlax).entry_point())

tests/test_image.py

@@ -1,7 +1,7 @@
 import pytest
 import os
 
-from shlax import Image
+from shlax.image import Image
 
 
 tests = {
@@ -25,9 +25,3 @@ def test_args(arg, expected):
     im = Image(arg)
     for k, v in expected.items():
         assert getattr(im, k) == v
-
-def test_args_env():
-    os.environ['IMAGE_TEST_ARGS_ENV'] = 'foo'
-    Image.ENV_TAGS = ['IMAGE_TEST_ARGS_ENV']
-    im = Image('re/po:x,y')
-    assert im.tags == ['x', 'y', 'foo']

tests/test_output.py

@@ -1,5 +1,5 @@
 import pytest
-from shlax import Output
+from shlax.output import Output
 
 
 class Write:

tests/test_proc.py

@@ -1,65 +0,0 @@
-import pytest
-
-from unittest.mock import patch
-
-from shlax import *
-from shlax import proc
-
-
-test_args_params = [
-    (
-        Localhost(Run('echo hi')),
-        [('sh', '-euc', 'echo hi')]
-    ),
-    (
-        Localhost(Run('echo hi', user='jimi')),
-        [('sudo', '-u', 'jimi', 'sh', '-euc', 'echo hi')]
-    ),
-    (
-        Localhost(Run('echo hi', user='root')),
-        [('sudo', 'sh', '-euc', 'echo hi')]
-    ),
-    (
-        Ssh('host', Run('echo hi', user='root')),
-        [('ssh', 'host', 'sudo', 'sh', '-euc', 'echo hi')]
-    ),
-    (
-        Buildah('alpine', Run('echo hi')),
-        [
-            ('buildah', 'from', 'alpine'),
-            ('buildah', 'mount', ''),
-            ('buildah', 'run', '', '--', 'sh', '-euc', 'echo hi'),
-            ('buildah', 'umount', ''),
-            ('buildah', 'rm', ''),
-        ]
-    ),
-    (
-        Buildah('alpine', Run('echo hi', user='root')),
-        [
-            ('buildah', 'from', 'alpine'),
-            ('buildah', 'mount', ''),
-            ('buildah', 'run', '--user', 'root', '', '--', 'sh', '-euc', 'echo hi'),
-            ('buildah', 'umount', ''),
-            ('buildah', 'rm', ''),
-        ]
-    ),
-    (
-        Ssh('host', Buildah('alpine', Run('echo hi', user='root'))),
-        [
-            ('ssh', 'host', 'buildah', 'from', 'alpine'),
-            ('ssh', 'host', 'buildah', 'mount', ''),
-            ('ssh', 'host', 'buildah', 'run', '--user', 'root', '', '--', 'sh', '-euc', 'echo hi'),
-            ('ssh', 'host', 'buildah', 'umount', ''),
-            ('ssh', 'host', 'buildah', 'rm', ''),
-        ]
-    ),
-]
-@pytest.mark.parametrize(
-    'script,commands',
-    test_args_params
-)
-@pytest.mark.asyncio
-async def test_args(script, commands):
-    with Proc.mock():
-        await script()
-        assert commands == Proc.test

tests/test_target.py

@@ -0,0 +1,132 @@
+import pytest
+
+from shlax.targets.stub import Stub
+from shlax.actions.run import Run
+from shlax.actions.parallel import Parallel
+from shlax.result import Result
+
+
+class Error:
+    async def __call__(self, target):
+        raise Exception('lol')
+
+
+@pytest.mark.asyncio
+async def test_success():
+    action = Run('echo hi')
+    target = Stub(action)
+    await target()
+    assert target.results[0].action == action
+    assert target.results[0].status == 'success'
+
+
+@pytest.mark.asyncio
+async def test_error():
+    action = Error()
+    target = Stub(action)
+    await target()
+    assert target.results[0].action == action
+    assert target.results[0].status == 'failure'
+
+
+@pytest.mark.asyncio
+async def test_nested():
+    nested = Error()
+
+    class Nesting:
+        async def __call__(self, target):
+            await target(nested)
+    nesting = Nesting()
+
+    target = Stub(nesting)
+    await target()
+
+    assert len(target.results) == 2
+    assert target.results[0].status == 'failure'
+    assert target.results[0].action == nested
+    assert target.results[1].status == 'failure'
+    assert target.results[1].action == nesting
+
+
+@pytest.mark.asyncio
+async def test_parallel():
+    winner = Run('echo hi')
+    looser = Error()
+    parallel = Parallel(winner, looser)
+
+    target = Stub(parallel)
+    await target()
+    assert len(target.results) == 3
+    assert target.results[0].status == 'success'
+    assert target.results[0].action == winner
+    assert target.results[1].status == 'failure'
+    assert target.results[1].action == looser
+    assert target.results[2].status == 'failure'
+    assert target.results[2].action == parallel
+
+
+@pytest.mark.asyncio
+async def test_function():
+    async def hello(target):
+        await target.exec('hello')
+    await Stub()(hello)
+
+
+@pytest.mark.asyncio
+async def test_action_clean():
+    class Example:
+        def __init__(self):
+            self.was_called = False
+        async def clean(self, target, result):
+            self.was_called = True
+        async def __call__(self, target):
+            raise Exception('lol')
+
+    action = Example()
+    target = Stub()
+    with pytest.raises(Exception):
+        await target(action)
+    assert action.was_called
+
+
+@pytest.mark.asyncio
+async def test_target_clean():
+    class Example(Stub):
+        def __init__(self, action):
+            self.was_called = False
+            super().__init__(action)
+        async def clean(self, target, result):
+            self.was_called = True
+
+    target = Example(Error())
+    await target()
+    assert target.was_called
+
+
+@pytest.mark.asyncio
+async def test_method():
+    class Example:
+        def __init__(self):
+            self.was_called = False
+        async def test(self, target):
+            self.was_called = True
+
+    example = Example()
+    action = example.test
+    target = Stub()
+    await target(action)
+    assert example.was_called
+
+
+@pytest.mark.asyncio
+async def test_target_action():
+    child = Stub(Run('echo hi'))
+    parent = Stub(child)
+
+    grandpa = Stub()
+    await grandpa(parent)
+    assert len(grandpa.results) == 3
+
+    grandpa = Stub(parent)
+    await grandpa()
+    assert len(grandpa.results) == 3