invenio-symlink-installer

#!/usr/bin/env python
# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2012 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

import sys
import os
import getopt

__doc__ = """\
Simple GNU install drop-in replacement that creates symlinks instead of copying
file over.

Usage:
$ INSTALL=%s ./configure [CONFIGURE OPTIONS]
""" % sys.argv[0]


def usage():
    """
    Print usage instruction and exit.
    """
    print >> sys.stderr, __doc__
    sys.exit(1)

def main():
    """
    Parse the minimal set of GNU install CLI arguments in order to install
    Invenio using symlinks.
    """
    optlist, args = getopt.gnu_getopt(sys.argv[1:], 'bvVfFh:m:o:psS:t:TvZ:', ["backup=", "compare", "group=", "mode=", "owner=", "preserve-timestamps", "strip", "strip-program=", "target-directory=", "no-target-directory", "verbose", "preserve-context", "context=", "help", "version"])
    files = args[:-1]
    if args:
        dd = args[-1]
    else:
        dd = None
    cwd = os.getcwd()
    verbose = False
    try:
        for opt, value in optlist:
            if opt in ('-v', '--verbose'):
                verbose = True
            elif opt in ('-T', '--no-target-directory'):
                dd = None
                files = args
            elif opt in ('-t', '--target-directory'):
                dd = value
                files = args
            elif opt in ('-h', '--help'):
                usage()
        if dd:
            if not os.path.exists(dd):
                os.makedirs(dd)
            for file in files:
                from_file = os.path.join(cwd, file)
                to_file = os.path.join(dd, file)
                if os.path.exists(to_file):
                    os.remove(to_file)
                os.symlink(from_file, to_file)
                if verbose:
                    print "Linking %s to %s" % (from_file, to_file)
        else:
            from_file = os.path.join(cwd, args[0])
            to_file = args[1]
            if os.path.exists(to_file):
                os.remove(to_file)
            os.symlink(from_file, to_file)
            if verbose:
                print "Linking %s to %s" % (from_file, to_file)
    except Exception, err:
        print >> sys.stderr, "ERROR: in calling %s: %s" % (' '.join(sys.argv), err)
        usage()

if __name__ == "__main__":
    main()