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76a63d102b
Show a warning message that a package manager is running. This prevents users from getting an installation error just because another installation/upgrade is running. Closes: #625.
120 lines
3.6 KiB
Python
Executable File
120 lines
3.6 KiB
Python
Executable File
#!/usr/bin/python3
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#
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# This file is part of Plinth.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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Wrapper to handle package installation with apt-get.
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"""
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import argparse
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from importlib import import_module
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import os
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import subprocess
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import sys
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from plinth import cfg
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LOCK_FILE = '/var/lib/dpkg/lock'
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def parse_arguments():
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"""Return parsed command line arguments as dictionary."""
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parser = argparse.ArgumentParser()
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subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
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subparsers.add_parser('update', help='update the package lists')
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subparser = subparsers.add_parser('install', help='install packages')
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subparser.add_argument(
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'module', help='name of module for which package is being installed')
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subparser.add_argument(
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'packages', nargs='+', help='list of packages to install')
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subparsers.add_parser('is-package-manager-busy',
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help='Return whether package manager is busy')
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subparsers.required = True
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return parser.parse_args()
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def _run_apt_command(arguments):
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"""Run apt-get with provided arguments."""
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# Ask apt-get to output its progress to file descriptor 3.
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command = ['apt-get', '--assume-yes', '--quiet=2', '--option',
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'APT::Status-Fd=3'] + arguments
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# Duplicate stdout to file descriptor 3 for this process.
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os.dup2(1, 3)
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# Pass on file descriptor 3 instead of closing it. Close stdout
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# so that regular output is ignored.
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env = os.environ.copy()
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env['DEBIAN_FRONTEND'] = 'noninteractive'
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process = subprocess.run(
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command, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
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close_fds=False, env=env)
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sys.exit(process.returncode)
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def subcommand_update(arguments):
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"""Update apt package lists."""
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_run_apt_command(['update'])
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def subcommand_install(arguments):
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"""Install packages using apt-get."""
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try:
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_assert_managed_packages(arguments.module, arguments.packages)
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except Exception as exception:
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print('Access check failed:', exception, file=sys.stderr)
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sys.exit(99)
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_run_apt_command(['install'] + arguments.packages)
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def _assert_managed_packages(module, packages):
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"""Check that list of packages are in fact managed by module."""
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cfg.read()
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module_file = os.path.join(cfg.config_dir, 'modules-enabled', module)
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with open(module_file, 'r') as file_handle:
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module_path = file_handle.read().strip()
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module = import_module(module_path)
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for package in packages:
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assert package in module.managed_packages
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def subcommand_is_package_manager_busy(_):
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"""Return whether package manager is busy."""
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try:
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subprocess.check_output(['lsof', LOCK_FILE])
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except subprocess.CalledProcessError:
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sys.exit(-1)
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def main():
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"""Parse arguments and perform all duties."""
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arguments = parse_arguments()
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subcommand = arguments.subcommand.replace('-', '_')
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subcommand_method = globals()['subcommand_' + subcommand]
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subcommand_method(arguments)
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if __name__ == '__main__':
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main()
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