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import os
from . import Executor
class Cleaner(Executor):
'''
Cleans broken symbolic links.
'''
_directive = 'clean'
def can_handle(self, directive):
return directive == self._directive
def handle(self, directive, data):
if directive != self._directive:
raise ValueError('Cleaner cannot handle directive %s' % directive)
return self._process_clean(data)
def _process_clean(self, targets):
success = True
for target in targets:
success &= self._clean(target)
if success:
self._log.info('All targets have been cleaned')
else:
self._log.error('Some targets were not successfully cleaned')
return success
def _clean(self, target):
'''
Cleans all the broken symbolic links in target that point to
a subdirectory of the base directory.
'''
if not os.path.isdir(os.path.expanduser(target)):
self._log.debug('Ignoring nonexistent directory %s' % target)
return True
for item in os.listdir(os.path.expanduser(target)):
path = os.path.join(os.path.expanduser(target), item)
if not os.path.exists(path) and os.path.islink(path):
if self._in_directory(path, self._base_directory):
self._log.lowinfo('Removing invalid link %s -> %s' %
(path, os.path.join(os.path.dirname(path), os.readlink(path))))
os.remove(path)
return True
def _in_directory(self, path, directory):
'''
Returns true if the path is in the directory.
'''
directory = os.path.join(os.path.realpath(directory), '')
path = os.path.realpath(path)
return os.path.commonprefix([path, directory]) == directory
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