cvs2hg

#!/usr/bin/env python
# (Be in -*- python -*- mode.)
#
# ====================================================================
# Copyright (c) 2000-2008 CollabNet.  All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution.  The terms
# are also available at http://subversion.tigris.org/license-1.html.
# If newer versions of this license are posted there, you may use a
# newer version instead, at your option.
#
# This software consists of voluntary contributions made by many
# individuals.  For exact contribution history, see the revision
# history and logs, available at http://cvs2svn.tigris.org/.
# ====================================================================

import sys

# Make sure that a supported version of Python is being used.  Do this
# as early as possible, using only code compatible with Python 1.5.2
# and Python 3.x before the check.  Remember:
#
# Python 1.5.2 doesn't have sys.version_info or ''.join().
# Python 3.0 doesn't have string.join().
# There are plans to start deprecating the string formatting '%'
# operator in Python 3.1 (but we use it here anyway).

version_error = """\
ERROR: cvs2hg requires Python 2, version 2.4 or later; it does not
work with Python 3.  You are currently using"""

version_advice = """\
Please restart cvs2hg using a different version of the Python
interpreter.  Visit http://www.python.org or consult your local system
administrator if you need help.

HINT: If you already have a usable Python version installed, it might
be possible to invoke cvs2hg with the correct Python interpreter by
typing something like 'python2.5 """ + sys.argv[0] + """ [...]'.
"""

try:
  version = sys.version_info
except AttributeError:
  # This is probably a pre-2.0 version of Python.
  sys.stderr.write(version_error + '\n')
  sys.stderr.write('-'*70 + '\n')
  sys.stderr.write(sys.version + '\n')
  sys.stderr.write('-'*70 + '\n')
  sys.stderr.write(version_advice)
  sys.exit(1)

if not ((2,4) <= version < (3,0)):
  sys.stderr.write(
      version_error + ' version %d.%d.%d.\n'
      % (version[0], version[1], version[2],)
      )
  sys.stderr.write(version_advice)
  sys.exit(1)

hg_required = "ERROR: cvs2hg requires Mercurial 1.1 or later.\n"
hg_missing = "(No Mercurial API found.)\n"
hg_version = "(Attempted to use the Mercurial %s API in\n%s.)\n"


import os
try:
  import mercurial
  from mercurial import context, __version__
  context.memctx                        # ensure Mercurial >= 1.1
  context.memfilectx
except ImportError:
  sys.stderr.write(hg_required + hg_missing)
  sys.exit(1)
except AttributeError:
  sys.stderr.write(hg_required +
                   hg_version
                   % (__version__.version,
                      os.path.dirname(mercurial.__file__)))
  sys.exit(1)

import os

from cvs2svn_lib.common import FatalException
from cvs2svn_lib.main import hg_main


try:
  hg_main(os.path.basename(sys.argv[0]), sys.argv[1:])
except FatalException, e:
  sys.stderr.write(str(e) + '\n')
  sys.exit(1)