300     try:

   300     # No readline() in osutil.posixfile, reading everything is

   301         file = repo.vfs('bookmarks.current')

   301     # cheap.

   302     except IOError as inst:

   302     content = repo.vfs.tryread('bookmarks.current')

   303         if inst.errno != errno.ENOENT:

   303     mark = encoding.tolocal((content.splitlines() or [''])[0])

   304             raise

   304     if mark == '' or mark not in marks:

   305         return None

   305         mark = None

   306     try:

   307         # No readline() in osutil.posixfile, reading everything is

   308         # cheap.

   309         # Note that it's possible for readlines() here to raise

   310         # IOError, since we might be reading the active mark over

   311         # static-http which only tries to load the file when we try

   312         # to read from it.

   313         mark = encoding.tolocal((file.readlines() or [''])[0])

   314         if mark == '' or mark not in marks:

   315             mark = None

   316     except IOError as inst:

   317         if inst.errno != errno.ENOENT:

   318             raise

   319         return None

   320     finally:

   321         file.close()