184 lines
7 KiB
Python
184 lines
7 KiB
Python
import os
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import shutil
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import dotbot
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class Link(dotbot.Plugin):
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'''
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Symbolically links dotfiles.
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'''
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_directive = 'link'
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def can_handle(self, directive):
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return directive == self._directive
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def handle(self, directive, data):
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if directive != self._directive:
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raise ValueError('Link cannot handle directive %s' % directive)
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return self._process_links(data)
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def _process_links(self, links):
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success = True
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defaults = self._context.defaults().get('link', {})
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for destination, source in links.items():
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destination = os.path.expandvars(destination)
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relative = defaults.get('relative', False)
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force = defaults.get('force', False)
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relink = defaults.get('relink', False)
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create = defaults.get('create', False)
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if isinstance(source, dict):
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# extended config
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relative = source.get('relative', relative)
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force = source.get('force', force)
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relink = source.get('relink', relink)
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create = source.get('create', create)
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path = self._default_source(destination, source.get('path'))
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else:
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path = self._default_source(destination, source)
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path = os.path.expandvars(os.path.expanduser(path))
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if not self._exists(os.path.join(self._context.base_directory(), path)):
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success = False
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self._log.warning('Nonexistent target %s -> %s' %
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(destination, path))
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continue
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if create:
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success &= self._create(destination)
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if force or relink:
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success &= self._delete(path, destination, relative, force)
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success &= self._link(path, destination, relative)
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if success:
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self._log.info('All links have been set up')
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else:
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self._log.error('Some links were not successfully set up')
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return success
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def _default_source(self, destination, source):
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if source is None:
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basename = os.path.basename(destination)
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if basename.startswith('.'):
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return basename[1:]
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else:
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return basename
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else:
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return source
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def _is_link(self, path):
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'''
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Returns true if the path is a symbolic link.
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'''
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return os.path.islink(os.path.expanduser(path))
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def _link_destination(self, path):
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'''
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Returns the destination of the symbolic link.
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'''
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path = os.path.expanduser(path)
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return os.readlink(path)
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def _exists(self, path):
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'''
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Returns true if the path exists.
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'''
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path = os.path.expanduser(path)
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return os.path.exists(path)
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def _create(self, path):
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success = True
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parent = os.path.abspath(os.path.join(os.path.expanduser(path), os.pardir))
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if not self._exists(parent):
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try:
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os.makedirs(parent)
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except OSError as err:
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self._log.warning('Failed to create directory %s' % parent)
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self._log.debug('Error: %s.' % err.strerror)
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success = False
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else:
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self._log.lowinfo('Creating directory %s' % parent)
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return success
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def _delete(self, source, path, relative, force):
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success = True
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source = os.path.join(self._context.base_directory(), source)
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fullpath = os.path.expanduser(path)
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if relative:
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source = self._relative_path(source, fullpath)
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if ((self._is_link(path) and self._link_destination(path) != source) or
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(self._exists(path) and not self._is_link(path))):
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removed = False
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try:
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if os.path.islink(fullpath):
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os.unlink(fullpath)
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removed = True
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elif force:
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if os.path.isdir(fullpath):
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shutil.rmtree(fullpath)
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removed = True
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else:
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os.remove(fullpath)
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removed = True
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except OSError as err:
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self._log.warning('Failed to remove %s' % path)
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self._log.debug('Error: %s' % err.strerror)
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success = False
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else:
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if removed:
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self._log.lowinfo('Removing %s' % path)
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return success
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def _relative_path(self, source, destination):
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'''
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Returns the relative path to get to the source file from the
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destination file.
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'''
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destination_dir = os.path.dirname(destination)
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return os.path.relpath(source, destination_dir)
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def _link(self, source, link_name, relative):
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'''
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Links link_name to source.
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Returns true if successfully linked files.
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'''
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success = False
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destination = os.path.expanduser(link_name)
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absolute_source = os.path.join(self._context.base_directory(), source)
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if relative:
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source = self._relative_path(absolute_source, destination)
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else:
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source = absolute_source
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if (not self._exists(link_name) and self._is_link(link_name) and
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self._link_destination(link_name) != source):
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self._log.warning('Invalid link %s -> %s' %
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(link_name, self._link_destination(link_name)))
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# we need to use absolute_source below because our cwd is the dotfiles
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# directory, and if source is relative, it will be relative to the
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# destination directory
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elif not self._exists(link_name) and self._exists(absolute_source):
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try:
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os.symlink(source, destination)
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except OSError as err:
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self._log.warning('Linking failed %s -> %s' % (link_name, source))
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self._log.debug('Error: %s' % err.strerror)
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else:
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self._log.lowinfo('Creating link %s -> %s' % (link_name, source))
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success = True
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elif self._exists(link_name) and not self._is_link(link_name):
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self._log.warning(
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'%s already exists but is a regular file or directory' %
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link_name)
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elif self._is_link(link_name) and self._link_destination(link_name) != source:
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self._log.warning('Incorrect link %s -> %s' %
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(link_name, self._link_destination(link_name)))
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# again, we use absolute_source to check for existence
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elif not self._exists(absolute_source):
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if self._is_link(link_name):
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self._log.warning('Nonexistent target %s -> %s' %
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(link_name, source))
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else:
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self._log.warning('Nonexistent target for %s : %s' %
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(link_name, source))
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else:
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self._log.lowinfo('Link exists %s -> %s' % (link_name, source))
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success = True
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return success
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