d17f75a010
User defined processes are defined by new cdist beta command 'process'.
Processes can be defined in `process` subdirectory in `$HOME/.cdist` or
in custom directories specified through CDIST_PROCESS_PATH environment
variable.
`<path>/process` processes are defined in subdirectories, where a
directory must contain `__init__.py` file to be recognized as a process,
and it is then imported as a module.
Since scanning and registering processes happens before cdist arguments
are parsed, then standard cdist logging cannot be used in this stage.
This is why CDIST_PROCESS_DEBUG environemnt variable turns on debug
messages.
Dummy example (`~/.cdist/process/homeprocess/__init__.py`):
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import logging
import subprocess
log = logging.getLogger(__name__)
def register(parent_parser):
parser = parent_parser.add_parser('cdist-help')
parser.set_defaults(func=cdist_help)
def cdist_help(args):
cmd = [ "cdist", "-h", ]
log.info("Running my process cdist help")
subprocess.check_call(cmd)
81 lines
2.4 KiB
Python
81 lines
2.4 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# 2020 Darko Poljak (darko.poljak at gmail.com)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import os
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import sys
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import importlib
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import re
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import cdist
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PROCESS_PARENT = 'process'
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_PROCESS_DEBUG = os.environ.get('CDIST_PROCESS_DEBUG', None)
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if _PROCESS_DEBUG:
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def _debug(msg):
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print('[cdist process debug] {}'.format(msg))
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else:
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def _debug(msg):
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pass
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_process_path = []
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_env_path = os.environ.get('CDIST_PROCESS_PATH', None)
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if _env_path:
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for x in re.split(r'(?<!\\):', _env_path):
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if x:
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_debug('Adding CDIST_PROCESS_PATH {}'.format(x))
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_process_path.append(x)
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_home_dir = cdist.home_dir()
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if _home_dir:
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_debug('Adding cdist home dir process path {}'.format(_home_dir))
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_process_path.append(_home_dir)
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def _scan_processes():
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for path in _process_path:
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process_path = os.path.join(path, PROCESS_PARENT)
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for fname in os.listdir(process_path):
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entry = os.path.join(process_path, fname)
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if not os.path.isdir(entry):
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continue
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_debug('Scanning {}'.format(entry))
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pfile = os.path.join(entry, '__init__.py')
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_debug('Scanning {}'.format(pfile))
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if os.path.exists(pfile):
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_debug('Found process in {}: {}'.format(entry, pfile))
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yield entry
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def setup(parent_parser):
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for entry in _scan_processes():
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mod_name = os.path.basename(entry)
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mod_dir = os.path.dirname(entry)
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sys.path.insert(0, mod_dir)
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proc_mod = importlib.import_module(mod_name)
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_debug('Registering process module {} from {}'.format(
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mod_name, entry))
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proc_mod.register(parent_parser)
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def commandline(args, parser):
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parser.print_help()
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