Source code for certbot.plugins.util

"""Plugin utilities."""
import logging
import os

from certbot import util

logger = logging.getLogger(__name__)

[docs]def get_prefixes(path): """Retrieves all possible path prefixes of a path, in descending order of length. For instance, (linux) /a/b/c returns ['/a/b/c', '/a/b', '/a', '/'] (windows) C:\\a\\b\\c returns ['C:\\a\\b\\c', 'C:\\a\\b', 'C:\\a', 'C:'] :param str path: the path to break into prefixes :returns: all possible path prefixes of given path in descending order :rtype: `list` of `str` """ prefix = os.path.normpath(path) prefixes = [] while len(prefix) > 0: prefixes.append(prefix) prefix, _ = os.path.split(prefix) # break once we hit the root path if prefix == prefixes[-1]: break return prefixes
[docs]def path_surgery(cmd): """Attempt to perform PATH surgery to find cmd Mitigates https://github.com/certbot/certbot/issues/1833 :param str cmd: the command that is being searched for in the PATH :returns: True if the operation succeeded, False otherwise """ dirs = ("/usr/sbin", "/usr/local/bin", "/usr/local/sbin") path = os.environ["PATH"] added = [] for d in dirs: if d not in path: path += os.pathsep + d added.append(d) if any(added): logger.debug("Can't find %s, attempting PATH mitigation by adding %s", cmd, os.pathsep.join(added)) os.environ["PATH"] = path if util.exe_exists(cmd): return True else: expanded = " expanded" if any(added) else "" logger.debug("Failed to find executable %s in%s PATH: %s", cmd, expanded, path) return False