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#!/usr/bin/env python3
# File: s2slib.py
# Locations:
# /mnt/public/Support/Programs/shortcuts/
# https://gitlab.com/bgstack15/s2s
# Author: bgstack15@gmail.com
# SPDX-License-Identifier: GPL-3.0
# Startdate: 2021-02-11 20:00
# Title: Shortcut To Symlink library
# Purpose: Convert .lnk files to POSIX symlinks within a single filesystem
# History:
# Usage:
# see s2s.py
# Reference:
# https://stackoverflow.com/questions/25146960/python-convert-back-slashes-to-forward-slashes/25147093#25147093
# https://github.com/libyal/liblnk/blob/main/documentation/Windows%20Shortcut%20File%20(LNK)%20format.asciidoc#file_attribute_flags
# Improve:
# Handle absolute paths when relative paths are absent?
# Add a force=True option to overwrite existing symlink that points to something else
# Dependencies:
# devuan-req: python3-liblnk
import pylnk # python3-liblnk
import os, re, posixpath
from sys import stderr
debuglevel = 8
# Functions
def eprint(*args, **kwargs):
print(*args, file=stderr, **kwargs)
# to benefit from caching outside of the function, maybe
lnkregex = re.compile(".*\.lnk$")
def replace_one_symlink(
lnkfile
, delete = False
, debuglevel = debuglevel
, dryrun = False
):
thislnk = pylnk.file()
basename = os.path.basename(lnkfile)
#workdir = os.path.dirname(lnkfile) # not used
# Exit if this is not a .lnk file
if not re.match(lnkregex,basename):
eprint(f"Cannot operate on {lnkfile}")
return -1
thislnk.open(lnkfile)
# Get relative path
# we are really expecting a relative path for every single one, because we are dealing with Windows shortcuts to files all on the same network share.
# Although I suppose a symlink could work if you could somehow map the expected SMB path to a POSIX filesystem
try:
relative_path = thislnk.relative_path
except:
eprint(f"No relative path for {lnkfile}, and abs path not yet implemented.")
return -1
# and make it a Unix-style path
relative_path = posixpath.join(*thislnk.relative_path.split('\\'))
# Not used for anything, but here if we want it.
linktype = "file"
if thislnk.file_attribute_flags & 0x10:
linktype = "dir"
# Get preferred name, and strip any " - Shortcut"
pn = os.path.splitext(lnkfile)[:-1][0] # remove the .lnk part, but preserve any other dots
symlink_path = re.sub(' - Shortcut$', "",pn)
# take action
if debuglevel >= 5:
eprint(f"Want symlink \"{symlink_path}\" ({linktype})--> \"{relative_path}\"")
ready_to_delete = False
if os.path.exists(symlink_path):
current_source = ""
try:
current_source = os.path.realpath(symlink_path)
except:
eprint(f"Unable to determine current_source for {symlink_path} which already exists.")
normpath = os.path.normpath(os.path.join(os.path.dirname(symlink_path),relative_path))
#eprint(f"Please ensure {current_source} matches {relative_path} which is {normpath}")
if normpath != current_source:
# The existing symlink points to something else. Not sure how to proceed.
# probably need to add a --force option to overwrite
eprint(f"Warning: Existing symlink {symlink_path} points to {current_source} and not {normpath} as requested")
else:
# it exists and already points to what we want it to point to.
if debuglevel >= 3:
eprint(f"symlink {symlink_path} already points to {current_source} which is {normpath}")
ready_to_delete = True
else:
# symlink does not exist, so make it!
if debuglevel >= 1:
eprint(f"ln -s {relative_path} {symlink_path}")
if not dryrun:
try:
os.symlink(relative_path,symlink_path)
ready_to_delete = True
except Exception as e:
eprint(e)
if delete:
if ready_to_delete:
if debuglevel >= 2:
eprint(f"rm {lnkfile}")
if not dryrun:
os.remove(lnkfile)
return 0
def list_all_child_lnk_files(indir):
mylist = []
for root, dirs, files in os.walk(indir):
for name in files:
if ".lnk" in name:
mylist.append(os.path.join(root,name))
#eprint(os.path.join(root,name))
return mylist
def replace_all_symlinks(
indir
, delete = False
, debuglevel = debuglevel
, dryrun = False
):
result = 0
# get list of all lnk files
mylist = list_all_child_lnk_files(indir)
for lnkfile in mylist:
replace_one_symlink(
lnkfile
, delete = delete
, debuglevel = debuglevel
, dryrun = dryrun
)
return result
if __name__ == "__main__":
print("running the main loop")
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