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//usr/lib/python2.7/site-packages/certbot/_internal/hooks.py

"""Facilities for implementing hooks that call shell commands."""
from __future__ import print_function

import logging

from acme.magic_typing import List
from acme.magic_typing import Set
from certbot import errors
from certbot import util
from certbot.compat import filesystem
from certbot.compat import misc
from certbot.compat import os
from certbot.plugins import util as plug_util

logger = logging.getLogger(__name__)

def validate_hooks(config):
    """Check hook commands are executable."""
    validate_hook(config.pre_hook, "pre")
    validate_hook(config.post_hook, "post")
    validate_hook(config.deploy_hook, "deploy")
    validate_hook(config.renew_hook, "renew")

def _prog(shell_cmd):
    """Extract the program run by a shell command.

:param str shell_cmd: command to be executed

:returns: basename of command or None if the command isn't found
    :rtype: str or None

"""
    if not util.exe_exists(shell_cmd):
        plug_util.path_surgery(shell_cmd)
        if not util.exe_exists(shell_cmd):
            return None
    return os.path.basename(shell_cmd)

def validate_hook(shell_cmd, hook_name):
    """Check that a command provided as a hook is plausibly executable.

:raises .errors.HookCommandNotFound: if the command is not found
    """
    if shell_cmd:
        cmd = shell_cmd.split(None, 1)[0]
        if not _prog(cmd):
            path = os.environ["PATH"]
            if os.path.exists(cmd):
                msg = "{1}-hook command {0} exists, but is not executable.".format(cmd, hook_name)
            else:
                msg = "Unable to find {2}-hook command {0} in the PATH.\n(PATH is {1})".format(
                    cmd, path, hook_name)

raise errors.HookCommandNotFound(msg)

def pre_hook(config):
    """Run pre-hooks if they exist and haven't already been run.

When Certbot is running with the renew subcommand, this function
    runs any hooks found in the config.renewal_pre_hooks_dir (if they
    have not already been run) followed by any pre-hook in the config.
    If hooks in config.renewal_pre_hooks_dir are run and the pre-hook in
    the config is a path to one of these scripts, it is not run twice.

:param configuration.NamespaceConfig config: Certbot settings

"""
    if config.verb == "renew" and config.directory_hooks:
        for hook in list_hooks(config.renewal_pre_hooks_dir):
            _run_pre_hook_if_necessary(hook)

cmd = config.pre_hook
    if cmd:
        _run_pre_hook_if_necessary(cmd)

executed_pre_hooks = set()  # type: Set[str]

def _run_pre_hook_if_necessary(command):
    """Run the specified pre-hook if we haven't already.

If we've already run this exact command before, a message is logged
    saying the pre-hook was skipped.

:param str command: pre-hook to be run

"""
    if command in executed_pre_hooks:
        logger.info("Pre-hook command already run, skipping: %s", command)
    else:
        _run_hook("pre-hook", command)
        executed_pre_hooks.add(command)

def post_hook(config):
    """Run post-hooks if defined.

This function also registers any executables found in
    config.renewal_post_hooks_dir to be run when Certbot is used with
    the renew subcommand.

If the verb is renew, we delay executing any post-hooks until
    :func:`run_saved_post_hooks` is called. In this case, this function
    registers all hooks found in config.renewal_post_hooks_dir to be
    called followed by any post-hook in the config. If the post-hook in
    the config is a path to an executable in the post-hook directory, it
    is not scheduled to be run twice.

:param configuration.NamespaceConfig config: Certbot settings

"""

cmd = config.post_hook
    # In the "renew" case, we save these up to run at the end
    if config.verb == "renew":
        if config.directory_hooks:
            for hook in list_hooks(config.renewal_post_hooks_dir):
                _run_eventually(hook)
        if cmd:
            _run_eventually(cmd)
    # certonly / run
    elif cmd:
        _run_hook("post-hook", cmd)

post_hooks = []  # type: List[str]

def _run_eventually(command):
    """Registers a post-hook to be run eventually.

All commands given to this function will be run exactly once in the
    order they were given when :func:`run_saved_post_hooks` is called.

:param str command: post-hook to register to be run

"""
    if command not in post_hooks:
        post_hooks.append(command)

def run_saved_post_hooks():
    """Run any post hooks that were saved up in the course of the 'renew' verb"""
    for cmd in post_hooks:
        _run_hook("post-hook", cmd)

def deploy_hook(config, domains, lineage_path):
    """Run post-issuance hook if defined.

:param configuration.NamespaceConfig config: Certbot settings
    :param domains: domains in the obtained certificate
    :type domains: `list` of `str`
    :param str lineage_path: live directory path for the new cert

"""
    if config.deploy_hook:
        _run_deploy_hook(config.deploy_hook, domains,
                         lineage_path, config.dry_run)

def renew_hook(config, domains, lineage_path):
    """Run post-renewal hooks.

This function runs any hooks found in
    config.renewal_deploy_hooks_dir followed by any renew-hook in the
    config. If the renew-hook in the config is a path to a script in
    config.renewal_deploy_hooks_dir, it is not run twice.

If Certbot is doing a dry run, no hooks are run and messages are
    logged saying that they were skipped.

"""
    executed_dir_hooks = set()
    if config.directory_hooks:
        for hook in list_hooks(config.renewal_deploy_hooks_dir):
            _run_deploy_hook(hook, domains, lineage_path, config.dry_run)
            executed_dir_hooks.add(hook)

if config.renew_hook:
        if config.renew_hook in executed_dir_hooks:
            logger.info("Skipping deploy-hook '%s' as it was already run.",
                        config.renew_hook)
        else:
            _run_deploy_hook(config.renew_hook, domains,
                             lineage_path, config.dry_run)

def _run_deploy_hook(command, domains, lineage_path, dry_run):
    """Run the specified deploy-hook (if not doing a dry run).

If dry_run is True, command is not run and a message is logged
    saying that it was skipped. If dry_run is False, the hook is run
    after setting the appropriate environment variables.

:param str command: command to run as a deploy-hook
    :param domains: domains in the obtained certificate
    :type domains: `list` of `str`
    :param str lineage_path: live directory path for the new cert
    :param bool dry_run: True iff Certbot is doing a dry run

"""
    if dry_run:
        logger.warning("Dry run: skipping deploy hook command: %s",
                       command)
        return

os.environ["RENEWED_DOMAINS"] = " ".join(domains)
    os.environ["RENEWED_LINEAGE"] = lineage_path
    _run_hook("deploy-hook", command)

def _run_hook(cmd_name, shell_cmd):
    """Run a hook command.

:param str cmd_name: the user facing name of the hook being run
    :param shell_cmd: shell command to execute
    :type shell_cmd: `list` of `str` or `str`

:returns: stderr if there was any"""
    err, _ = misc.execute_command(cmd_name, shell_cmd, env=util.env_no_snap_for_external_calls())
    return err

def list_hooks(dir_path):
    """List paths to all hooks found in dir_path in sorted order.

:param str dir_path: directory to search

:returns: `list` of `str`
    :rtype: sorted list of absolute paths to executables in dir_path

"""
    allpaths = (os.path.join(dir_path, f) for f in os.listdir(dir_path))
    hooks = [path for path in allpaths if filesystem.is_executable(path) and not path.endswith('~')]
    return sorted(hooks)