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#!/usr/bin/python
#
# make a git archive out of a Debian source package
#
# (C) 2006 Guido Guenther <agx@sigxcpu.org>
#    This program 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.
#
#    This program 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 this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import sys
import re
import os
import tempfile
import glob
from optparse import OptionParser
from git_buildpackage import *

gitAdd=GitAdd()
gitCommitAll=GitCommitAll()
gitTag=GitTag()

class DscPackage(object):
    """Parse the dsc file for verions, package names, etc"""
    pkgre=re.compile('Source: (?P<pkg>[\w\-]+)')
    versionre=re.compile('Version: (?P<upstream>[a-z\d\.]+)(-(?P<debian>[a-z\d\.~]+))?')
    tarre=re.compile ('^ [\da-z]+ \d+ (?P<tar>[a-z\d-]+_[a-z\d\.\~\-]+(\.orig)?\.tar\.gz)')

    def __init__(self, dscfile):
        self.dscfile=os.path.abspath(dscfile)
    	f=file(self.dscfile)
        for line in f:
            m=self.versionre.match(line)
            if m:
                self.upstream_version = m.group('upstream')
                if m.group('debian'):
                    self.debian_version = m.group('debian')
                    self.native = False
                else:
                    print "Debian Native Package"
                    self.native = True # Debian native package
                continue
            m=self.pkgre.match(line)
            if m:
                self.pkg= m.group('pkg')
                continue
            m=self.tarre.match(line)
            if m:
                self.tgz= os.path.dirname(dscfile)+'/'+m.group('tar')
                continue
        f.close()
  

def import_upstream(src, dirs):
    try:
        unpackTGZ=UnpackTGZ(src.tgz, dirs['tmp'])
        unpackTGZ()
    except CommandExecFailed:
        print >>sys.stderr,"Unpacking of %s failed" % (src.tgz,)
        RemoveTree(dirs['tmp'])()
        return 1

    try:
        dirs['git']=glob.glob('%s/*' % (unpackTGZ.dir, ))[0]
        os.chdir(dirs['git'])
        GitInitDB()()
        gitAdd(['.'])
        gitCommitAll(msg="Imported upstream version %s" % (src.upstream_version,))
        gitTag(src.upstream_version)
        if not src.native:
            GitBranch()('upstream')
    except CommandExecFailed:
        print >>sys.stderr,"Creation of git repository failed"
        RemoveTree(unpackTGZ.dir)()
        return 1
    return 0


def apply_debian_patch(src, dirs):
    try:
        DpkgSourceExtract()(src.dscfile, dirs['dpkg-src'])
        os.chdir(dirs['git'])
        GitLoadDirs()(dirs['dpkg-src'], 'Imported debian patch')
        gitTag('%s-%s' % (src.upstream_version, src.debian_version))
    except CommandExecFailed:
        print >>sys.stderr,"Failed to import debian package"
        return 1
    return 0


def move_tree(src, dirs):
    os.rename(dirs['git'], src.pkg)
    RemoveTree(dirs['tmp'])()


def usage(parser):
    parser.print_help()
    sys.exit(0)


def main(argv):
    dirs={'top': os.path.abspath(os.curdir)}

    parser = OptionParser('%prog [options] /path/to/package.dsc')

    parser.add_option("-v", "--verbose", action="store_true", dest="verbose", default=False,
                      help="verbose command execution")
    (options, args) = parser.parse_args()

    if options.verbose:
        Command.verbose = True

    if len(args) != 1:
        usage(parser)
    else:        
        src=DscPackage(args[0])

        dirs['tmp']=os.path.abspath(tempfile.mkdtemp(dir='.'))
        if import_upstream(src, dirs):
            return 1
        os.chdir(dirs['top'])
        if not src.native:
            dirs['unpack']=dirs['tmp']+'/unpack'
            os.mkdir(dirs['unpack'])
            dirs['dpkg-src']="%s/%s-%s-%s" % (dirs['unpack'], src.pkg, src.upstream_version, src.debian_version)
            if apply_debian_patch(src, dirs):
                return 1
        os.chdir(dirs['top'])
        move_tree(src, dirs)
        print 'Everything imported under %s' % (src.pkg, )

if __name__ == '__main__':
    sys.exit(main(sys.argv))
	    
# vim:et:ts=4:sw=4: