#!/usr/bin/env python

#

# Copyright 2005-2007 by Intevation GmbH <intevation@intevation.de>

#

# Author(s):

# Thomas Arendsen Hein <thomas@intevation.de>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""

hg-ssh - a wrapper for ssh access to a limited set of mercurial repos

To be used in ~/.ssh/authorized_keys with the "command" option, see sshd(8):

command="hg-ssh path/to/repo1 /path/to/repo2 ~/repo3 ~user/repo4" ssh-dss ...

(probably together with these other useful options:

 no-port-forwarding,no-X11-forwarding,no-agent-forwarding)

This allows pull/push over ssh from/to the repositories given as arguments.

If all your repositories are subdirectories of a common directory, you can

allow shorter paths with:

command="cd path/to/my/repositories && hg-ssh repo1 subdir/repo2"

You can use pattern matching of your normal shell, e.g.:

command="cd repos && hg-ssh user/thomas/* projects/{mercurial,foo}"

"""

# enable importing on demand to reduce startup time

from mercurial import demandimport; demandimport.enable()

from mercurial import dispatch

import sys, os, shlex

def main():

    cwd = os.getcwd()

    allowed_paths = [os.path.normpath(os.path.join(cwd,

                                                   os.path.expanduser(path)))

    orig_cmd = os.getenv('SSH_ORIGINAL_COMMAND', '?')

    try:

        cmdargv = shlex.split(orig_cmd)

    except ValueError, e:

        sys.stderr.write('Illegal command "%s": %s\n' % (orig_cmd, e))

        sys.exit(255)

    if cmdargv[:2] == ['hg', '-R'] and cmdargv[3:] == ['serve', '--stdio']:

        path = cmdargv[2]

        repo = os.path.normpath(os.path.join(cwd, os.path.expanduser(path)))

        if repo in allowed_paths:

        else:

            sys.stderr.write('Illegal repository "%s"\n' % repo)

            sys.exit(255)

    else:

        sys.stderr.write('Illegal command "%s"\n' % orig_cmd)

        sys.exit(255)

if __name__ == '__main__':

    main()