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import imp
import os
import sys
import tempfile
from pip.backwardcompat import uses_pycache, b
from pip.exceptions import UninstallationError
from pip.log import logger
from pip.util import (rmtree, ask, is_local, dist_is_local, renames,
normalize_path)
class UninstallPathSet(object):
"""A set of file paths to be removed in the uninstallation of a
requirement."""
def __init__(self, dist):
self.paths = set()
self._refuse = set()
self.pth = {}
self.dist = dist
self.save_dir = None
self._moved_paths = []
def _permitted(self, path):
"""
Return True if the given path is one we are permitted to
remove/modify, False otherwise.
"""
return is_local(path)
def _can_uninstall(self):
if not dist_is_local(self.dist):
logger.notify(
"Not uninstalling %s at %s, outside environment %s" %
(
self.dist.project_name,
normalize_path(self.dist.location),
sys.prefix
),
)
return False
return True
def add(self, path):
path = normalize_path(path)
if not os.path.exists(path):
return
if self._permitted(path):
self.paths.add(path)
else:
self._refuse.add(path)
# __pycache__ files can show up after 'installed-files.txt' is created,
# due to imports
if os.path.splitext(path)[1] == '.py' and uses_pycache:
self.add(imp.cache_from_source(path))
def add_pth(self, pth_file, entry):
pth_file = normalize_path(pth_file)
if self._permitted(pth_file):
if pth_file not in self.pth:
self.pth[pth_file] = UninstallPthEntries(pth_file)
self.pth[pth_file].add(entry)
else:
self._refuse.add(pth_file)
def compact(self, paths):
"""Compact a path set to contain the minimal number of paths
necessary to contain all paths in the set. If /a/path/ and
/a/path/to/a/file.txt are both in the set, leave only the
shorter path."""
short_paths = set()
for path in sorted(paths, key=len):
if not any([
(path.startswith(shortpath) and
path[len(shortpath.rstrip(os.path.sep))] == os.path.sep)
for shortpath in short_paths]):
short_paths.add(path)
return short_paths
def _stash(self, path):
return os.path.join(
self.save_dir, os.path.splitdrive(path)[1].lstrip(os.path.sep))
def remove(self, auto_confirm=False):
"""Remove paths in ``self.paths`` with confirmation (unless
``auto_confirm`` is True)."""
if not self._can_uninstall():
return
if not self.paths:
logger.notify(
"Can't uninstall '%s'. No files were found to uninstall." %
self.dist.project_name
)
return
logger.notify('Uninstalling %s:' % self.dist.project_name)
logger.indent += 2
paths = sorted(self.compact(self.paths))
try:
if auto_confirm:
response = 'y'
else:
for path in paths:
logger.notify(path)
response = ask('Proceed (y/n)? ', ('y', 'n'))
if self._refuse:
logger.notify('Not removing or modifying (outside of prefix):')
for path in self.compact(self._refuse):
logger.notify(path)
if response == 'y':
self.save_dir = tempfile.mkdtemp(suffix='-uninstall',
prefix='pip-')
for path in paths:
new_path = self._stash(path)
logger.info('Removing file or directory %s' % path)
self._moved_paths.append(path)
renames(path, new_path)
for pth in self.pth.values():
pth.remove()
logger.notify(
'Successfully uninstalled %s' % self.dist.project_name
)
finally:
logger.indent -= 2
def rollback(self):
"""Rollback the changes previously made by remove()."""
if self.save_dir is None:
logger.error(
"Can't roll back %s; was not uninstalled" %
self.dist.project_name
)
return False
logger.notify('Rolling back uninstall of %s' % self.dist.project_name)
for path in self._moved_paths:
tmp_path = self._stash(path)
logger.info('Replacing %s' % path)
renames(tmp_path, path)
for pth in self.pth:
pth.rollback()
def commit(self):
"""Remove temporary save dir: rollback will no longer be possible."""
if self.save_dir is not None:
rmtree(self.save_dir)
self.save_dir = None
self._moved_paths = []
class UninstallPthEntries(object):
def __init__(self, pth_file):
if not os.path.isfile(pth_file):
raise UninstallationError(
"Cannot remove entries from nonexistent file %s" % pth_file
)
self.file = pth_file
self.entries = set()
self._saved_lines = None
def add(self, entry):
entry = os.path.normcase(entry)
# On Windows, os.path.normcase converts the entry to use
# backslashes. This is correct for entries that describe absolute
# paths outside of site-packages, but all the others use forward
# slashes.
if sys.platform == 'win32' and not os.path.splitdrive(entry)[0]:
entry = entry.replace('\\', '/')
self.entries.add(entry)
def remove(self):
logger.info('Removing pth entries from %s:' % self.file)
fh = open(self.file, 'rb')
# windows uses '\r\n' with py3k, but uses '\n' with py2.x
lines = fh.readlines()
self._saved_lines = lines
fh.close()
if any(b('\r\n') in line for line in lines):
endline = '\r\n'
else:
endline = '\n'
for entry in self.entries:
try:
logger.info('Removing entry: %s' % entry)
lines.remove(b(entry + endline))
except ValueError:
pass
fh = open(self.file, 'wb')
fh.writelines(lines)
fh.close()
def rollback(self):
if self._saved_lines is None:
logger.error(
'Cannot roll back changes to %s, none were made' % self.file
)
return False
logger.info('Rolling %s back to previous state' % self.file)
fh = open(self.file, 'wb')
fh.writelines(self._saved_lines)
fh.close()
return True
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