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"""Plugin utilities."""
import logging
import os
from certbot import util
logger = logging.getLogger(__name__)
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
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
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