git-big windows

windows.py

# experimental impl for core.symlinks = false
class WindowsFileSystem(FileSystem):
    def islink(self, path, start=None):
        if start:
            path = os.path.relpath(path, start)
        files = git('ls-files', '-s', path)
        lines = files.splitlines()
        if lines:
            first_line = lines[0]
            parts = first_line.split()
            mode = parts[0]
            if mode == '120000':
                return True
        return False

    def readlink(self, path):
        with io.open(path, 'r', encoding='utf-8') as file_:
            return file_.read().rstrip()

    def link(self, src, dst):
        import win32file
        win32file.CreateHardLink(dst, src)

    def symlink(self, src, dst, repo_dir):
        proc = subprocess.Popen(
            ['git', 'hash-object', '-w', '--stdin'],
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE)
        sha1 = proc.communicate(src.encode())[0].decode().rstrip()
        posix_dst = dst.replace('\\', '/')
        subprocess.check_output(
            [
                'git', 'update-index', '--add', '--cacheinfo',
                '120000,{},{}'.format(sha1, posix_dst)
            ],
            cwd=repo_dir)
        env = dict(os.environ)
        env['GIT_BIG_IGNORE_HOOK'] = '1'
        subprocess.check_output(
            ['git', 'checkout', '--', dst], env=env, cwd=repo_dir)