Patchwork [1,of,1] util: remove unused realpath (issue4063)

# HG changeset patch
# User Christian Ebert <blacktrash@gmx.net>
# Date 1388325244 0
#      Sun Dec 29 13:54:04 2013 +0000
# Node ID 716491387f2aead12b9a3be1f67c2f3748719e78
# Parent  532fa12033e1ddf9cbe0d5507263a2c9cfbfddf9
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.

On Sun, Dec 29, 2013 at 01:57:56PM +0000, Christian Ebert wrote:
> # HG changeset patch
> # User Christian Ebert <blacktrash@gmx.net>
> # Date 1388325244 0
> #      Sun Dec 29 13:54:04 2013 +0000
> # Node ID 716491387f2aead12b9a3be1f67c2f3748719e78
> # Parent  532fa12033e1ddf9cbe0d5507263a2c9cfbfddf9
> util: remove unused realpath (issue4063)

queued, thanks

>
> util.realpath was in use for only 5 days from dbdb777502dc
> until it was backed out in c519cd8f0169 because it caused
> issue3077 and issue3071.
>
> diff --git a/mercurial/posix.py b/mercurial/posix.py
> --- a/mercurial/posix.py
> +++ b/mercurial/posix.py
> @@ -197,7 +197,6 @@
>      return path.lower()
>
>  if sys.platform == 'darwin':
> -    import fcntl # only needed on darwin, missing on jython
>
>      def normcase(path):
>          '''
> @@ -265,51 +264,6 @@
>          # 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
> diff --git a/mercurial/util.py b/mercurial/util.py
> --- a/mercurial/util.py
> +++ b/mercurial/util.py
> @@ -52,7 +52,6 @@
>  popen = platform.popen
>  posixfile = platform.posixfile
>  quotecommand = platform.quotecommand
> -realpath = platform.realpath
>  rename = platform.rename
>  samedevice = platform.samedevice
>  samefile = platform.samefile
> diff --git a/mercurial/windows.py b/mercurial/windows.py
> --- a/mercurial/windows.py
> +++ b/mercurial/windows.py
> @@ -133,15 +133,6 @@
>  def normcase(path):
>      return encoding.upper(path)
>
> -def realpath(path):
> -    '''
> -    Returns the true, canonical file system path equivalent to the given
> -    path.
> -    '''
> -    # TODO: There may be a more clever way to do this that also handles other,
> -    # less common file systems.
> -    return os.path.normpath(normcase(os.path.realpath(path)))
> -
>  def samestat(s1, s2):
>      return False
>
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