comparison mercurial/posix.py @ 20202:a6014018ec28

util: remove unused realpath (issue4063)

util.realpath was in use for only 5 days from dbdb777502dc
until it was backed out in c519cd8f0169 because it caused
issue3077 and issue3071.

20201:bc3b48b0f5c8

# os.path.normcase is a no-op, which doesn't help us on non-native filesystems
def normcase(path):
    return path.lower()

if sys.platform == 'darwin':
    import fcntl # only needed on darwin, missing on jython

    def normcase(path):
        '''
        Normalize a filename for OS X-compatible comparison:
        - escape-encode invalid characters

            u = s.decode('utf-8')

        # Decompose then lowercase (HFS+ technote specifies lower)
        return unicodedata.normalize('NFD', u).lower().encode('utf-8')

    def realpath(path):
        '''
        Returns the true, canonical file system path equivalent to the given
        path.

        Equivalent means, in this case, resulting in the same, unique
        file system link to the path. Every file system entry, whether a file,
        directory, hard link or symbolic link or special, will have a single
        path preferred by the system, but may allow multiple, differing path
        lookups to point to it.

        Most regular UNIX file systems only allow a file system entry to be
        looked up by its distinct path. Obviously, this does not apply to case
        insensitive file systems, whether case preserving or not. The most
        complex issue to deal with is file systems transparently reencoding the
        path, such as the non-standard Unicode normalisation required for HFS+
        and HFSX.
        '''
        # Constants copied from /usr/include/sys/fcntl.h
        F_GETPATH = 50
        O_SYMLINK = 0x200000

        try:
            fd = os.open(path, O_SYMLINK)
        except OSError, err:
            if err.errno == errno.ENOENT:
                return path
            raise

        try:
            return fcntl.fcntl(fd, F_GETPATH, '\0' * 1024).rstrip('\0')
        finally:
            os.close(fd)
elif sys.version_info < (2, 4, 2, 'final'):
    # Workaround for http://bugs.python.org/issue1213894 (os.path.realpath
    # didn't resolve symlinks that were the first component of the path.)
    def realpath(path):
        if os.path.isabs(path):
            return os.path.realpath(path)
        else:
            return os.path.realpath('./' + path)
else:
    # Fallback to the likely inadequate Python builtin function.
    realpath = os.path.realpath

if sys.platform == 'cygwin':
    # workaround for cygwin, in which mount point part of path is
    # treated as case sensitive, even though underlying NTFS is case
    # insensitive.

20202:a6014018ec28

# os.path.normcase is a no-op, which doesn't help us on non-native filesystems
def normcase(path):
    return path.lower()

if sys.platform == 'darwin':

    def normcase(path):
        '''
        Normalize a filename for OS X-compatible comparison:
        - escape-encode invalid characters

            u = s.decode('utf-8')

        # Decompose then lowercase (HFS+ technote specifies lower)
        return unicodedata.normalize('NFD', u).lower().encode('utf-8')

if sys.platform == 'cygwin':
    # workaround for cygwin, in which mount point part of path is
    # treated as case sensitive, even though underlying NTFS is case
    # insensitive.