# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.

import os
import stat
from sos.report.plugins import Plugin, IndependentPlugin


class SosExtras(Plugin, IndependentPlugin):

    short_desc = 'Collect extra data defined in /etc/sos/extras.d'

    """The plugin traverses 'extras_dir' directory and for each file there,
    it executes commands or collects files optionally with sizelimit. Expected
    content of a file:
    - empty lines or those starting with '#' are ignored
    - add_copy_spec called to lines starting by ':', optionally followed by
      sizelimit
    - otherwise, whole line will be executed as a command.
    Example:
    command1 --arg1 val1
    command2
    :/path/to/file
    :/path/to/files* sizelimit

    WARNING: be careful what files to collect or what commands to execute:
    - prevent calling potentially dangerous or system altering commands, like:
      - using multiple commands on a line (via pipes, semicolon etc.)
      - executing commands on background
      - setting env.variables (as those will be ignored)
      - altering a system (not only by "rm -rf")
    - be aware, no secret obfuscation is made
    """

    plugin_name = "sos_extras"

    extras_dir = '/etc/sos/extras.d/'

    files = (extras_dir,)

    def setup(self):
        try:
            st_res = os.stat(self.extras_dir)
            if (st_res.st_uid != 0) or (st_res.st_mode & stat.S_IWGRP) or \
               (st_res.st_mode & stat.S_IWOTH):
                self._log_warn(f"Skipping sos extras as {self.extras_dir} has"
                               " too wide permissions or ownership.")
                return
        except OSError:
            self._log_warn(f"can't stat {self.extras_dir}, skipping sos"
                           " extras")
            return

        for path, _, filelist in os.walk(self.extras_dir):
            for file in filelist:
                _file = self.path_join(path, file)
                self._log_warn(f"Collecting data from extras file {_file}")
                try:
                    with open(_file, 'r', encoding='UTF-8') as sfile:
                        for line in sfile.read().splitlines():
                            # ignore empty lines or comments
                            if len(line.split()) == 0 or line.startswith('#'):
                                continue
                            # lines starting by ':' specify file pattern to
                            # collect optionally followed by sizelimit
                            if line.startswith(':'):
                                words = line.split()
                                limit = None
                                if len(words) > 1:
                                    try:
                                        limit = int(words[1])
                                    except ValueError:
                                        self._log_warn(
                                            f"Can't decode size limit on line"
                                            f"{line} in {_file}, using default"
                                        )
                                self.add_copy_spec(words[0][1:],
                                                   sizelimit=limit)
                            else:
                                # command to execute
                                self.add_cmd_output(line, subdir=file)

                except IOError:
                    self._log_warn(f"unable to read extras file {_file}")

# vim: set et ts=4 sw=4 :