205 lines
7.3 KiB
Python
Executable File
205 lines
7.3 KiB
Python
Executable File
#!/usr/bin/env python3
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"""dotfilemanager.py - a dotfiles manager script. See --help for usage
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and command-line arguments.
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"""
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import os,sys,platform
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# TODO: allow setting hostname as a command-line argument also?
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try:
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HOSTNAME = os.environ['DOTFILEMANAGER_HOSTNAME']
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except KeyError:
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HOSTNAME = platform.node()
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HOSTNAME_SEPARATOR = '__'
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def tidy(d,report=False):
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"""Find and delete any broken symlinks in directory d.
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Arguments:
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d -- The directory to consider (absolute path)
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Keyword arguments:
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report -- If report is True just report on what broken symlinks are
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found, don't attempt to delete them (default: False)
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"""
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for f in os.listdir(d):
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path = os.path.join(d,f)
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if os.path.islink(path):
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target_path = os.readlink(path)
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target_path = os.path.abspath(os.path.expanduser(target_path))
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if not os.path.exists(target_path):
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# This is a broken symlink.
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if report:
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print('tidy would delete broken symlink: %s->%s' % (path,target_path))
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else:
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print('Deleting broken symlink: %s->%s' % (path,target_path))
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os.remove(path)
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def get_target_paths(to_dir,report=False):
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"""Return the list of absolute paths to link to for a given to_dir.
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This handles skipping various types of filename in to_dir and
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resolving host-specific filenames.
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"""
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paths = []
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filenames = os.listdir(to_dir)
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for filename in filenames:
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path = os.path.join(to_dir,filename)
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if filename.endswith('~'):
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if report:
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print('Skipping %s' % filename)
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continue
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elif (not os.path.isfile(path)) and (not os.path.isdir(path)):
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if report:
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print('Skipping %s (not a file or directory)' % filename)
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continue
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elif filename.startswith('.'):
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if report:
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print('Skipping %s (filename has a leading dot)' % filename)
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continue
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else:
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if HOSTNAME_SEPARATOR in filename:
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# This appears to be a filename with a trailing
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# hostname, e.g. _muttrc__dulip. If the trailing
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# hostname matches the hostname of this host then we
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# link to it.
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hostname = filename.split(HOSTNAME_SEPARATOR)[-1]
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if hostname == HOSTNAME:
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paths.append(path)
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else:
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if report:
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print('Skipping %s (different hostname)' % filename)
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continue
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else:
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# This appears to be a filename without a trailing
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# hostname.
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if filename + HOSTNAME_SEPARATOR + HOSTNAME in filenames:
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if report:
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print('Skipping %s (there is a host-specific version of this file for this host)' % filename)
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continue
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else:
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paths.append(path)
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return paths
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def link(from_dir,to_dir,report=False):
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"""Make symlinks in from_dir to each file and directory in to_dir.
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This handles converting leading underscores in to_dir to leading
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dots in from_dir.
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Arguments:
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from_dir -- The directory in which symlinks will be created (string,
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absolute path)
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to_dir -- The directory containing the files and directories that
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will be linked to (string, absolute path)
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Keyword arguments:
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report -- If report is True then only report on the status of
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symlinks in from_dir, don't actually create any new
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symlinks (default: False)
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"""
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# The paths in to_dir that we will be symlinking to.
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to_paths = get_target_paths(to_dir,report)
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# Dictionary of symlinks we will be creating, from_path->to_path
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symlinks = {}
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for to_path in to_paths:
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to_directory, to_filename = os.path.split(to_path)
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# Change leading underscores to leading dots.
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if to_filename.startswith('_'):
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from_filename = '.' + to_filename[1:]
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else:
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from_filename = to_filename
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# Remove hostname specifiers.
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parts = from_filename.split(HOSTNAME_SEPARATOR)
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assert len(parts) == 1 or len(parts) == 2
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from_filename = parts[0]
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from_path = os.path.join(from_dir,from_filename)
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symlinks[from_path] = to_path
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# Attempt to create the symlinks that don't already exist.
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for from_path,to_path in list(symlinks.items()):
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# Check that nothing already exists at from_path.
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if os.path.islink(from_path):
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# A link already exists.
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existing_to_path = os.readlink(from_path)
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existing_to_path = os.path.abspath(os.path.expanduser(existing_to_path))
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if existing_to_path == to_path:
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# It's already a link to the intended target. All is
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# well.
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continue
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else:
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# It's a link to somewhere else.
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print(from_path+" => is already symlinked to "+existing_to_path)
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elif os.path.isfile(from_path):
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print("There's a file in the way at "+from_path)
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elif os.path.isdir(from_path):
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print("There's a directory in the way at "+from_path)
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elif os.path.ismount(from_path):
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print("There's a mount point in the way at "+from_path)
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else:
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# The path is clear, make the symlink.
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if report:
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print('link would make symlink: %s->%s' % (from_path,to_path))
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else:
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print('Making symlink %s->%s' % (from_path,to_path))
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os.symlink(to_path,from_path)
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def usage():
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return """Usage:
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dotfilemanager link|tidy|report [FROM_DIR [TO_DIR]]
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Commands:
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link -- make symlinks in FROM_DIR to files and directories in TO_DIR
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tidy -- remove broken symlinks from FROM_DIR
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report -- report on symlinks in FROM_DIR and files and directories in TO_DIR
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FROM_DIR defaults to ~ and TO_DIR defaults to ~/.dotfiles.
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"""
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if __name__ == "__main__":
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try:
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ACTION = sys.argv[1]
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except IndexError:
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print(usage())
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sys.exit(2)
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try:
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FROM_DIR = sys.argv[2]
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except IndexError:
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FROM_DIR = '~'
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FROM_DIR = os.path.abspath(os.path.expanduser(FROM_DIR))
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if not os.path.isdir(FROM_DIR):
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print("FROM_DIR %s is not a directory!" % FROM_DIR)
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print(usage())
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sys.exit(2)
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if ACTION == 'tidy':
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tidy(FROM_DIR)
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else:
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try:
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TO_DIR = sys.argv[3]
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except IndexError:
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TO_DIR = os.path.join('~','.dotfiles')
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TO_DIR = os.path.abspath(os.path.expanduser(TO_DIR))
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if not os.path.isdir(TO_DIR):
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print("TO_DIR %s is not a directory!" % TO_DIR)
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print(usage())
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sys.exit(2)
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if ACTION == 'link':
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link(FROM_DIR,TO_DIR)
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elif ACTION == 'report':
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link(FROM_DIR,TO_DIR,report=True)
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tidy(FROM_DIR,report=True)
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else:
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print(usage())
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sys.exit(2)
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