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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
#
# (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
"""make a git archive out of a Debian source package"""

import sys
import re
import os
import tempfile
import glob
import git_buildpackage
from git_buildpackage.deb_utils import debian_version_chars
from git_buildpackage.git_utils import sanitize_version
from git_buildpackage.config import GBPOptionParser


class DscFile(object):
    """Keeps all needed data read from a dscfile"""
    pkg_re = re.compile('Source:\s+(?P<pkg>.+)\s*')
    version_re = re.compile("Version:\s(\d+\:)?(?P<version>[%s]+)\s*$" % debian_version_chars)
    tar_re = re.compile('^\s\w+\s\d+\s+(?P<tar>[^_]+_[^_]+(\.orig)?\.tar\.(gz|bz2))')

    def __init__(self, dscfile):
        self.dscfile = os.path.abspath(dscfile)
        f = file(self.dscfile)
        for line in f:
            m = self.version_re.match(line)
            if m:
                if '-' in m.group('version'):
                    self.debian_version = m.group('version').split("-")[-1]
                    self.upstream_version = "-".join(m.group('version').split("-")[0:-1])
                    self.native = False
                else:
                    self.native = True # Debian native package
                    self.upstream_version = m.group('version')
                continue
            m = self.pkg_re.match(line)
            if m:
                self.pkg = m.group('pkg')
                continue
            m = self.tar_re.match(line)
            if m:
                fromdir = os.path.dirname(dscfile)
                self.tgz = os.path.join(fromdir, m.group('tar'))
                continue
        f.close()
    

def parse_dsc(dscfile):
    """parse dsc by creating a DscFile object"""
    try:
        dsc = DscFile(dscfile)
    except IOError, err:
        print >>sys.stderr, "Error reading dsc file: %s" % err
        dsc = None
    else:
        try:
            if dsc.native:
                print "Debian Native Package"
                print "Version:", dsc.upstream_version
            else:
                print "Upstream version:", dsc.upstream_version
                print "Debian version:", dsc.debian_version
        except AttributeError:
            print >>sys.stderr, "Error parsing dsc file %s" % dscfile 
            dsc = None
    return dsc


def import_upstream(src, dirs, upstream_branch, tagger):
    """
    import a new upstream version on the upstream branch and tag
    appropriately
    """
    try:
        unpackTGZ = git_buildpackage.UnpackTGZ(src.tgz, dirs['tmp'])
        unpackTGZ()
    except git_buildpackage.CommandExecFailed:
        print >>sys.stderr,"Unpacking of %s failed" % src.tgz
        git_buildpackage.RemoveTree(dirs['tmp'])()
        return False

    try:
        dirs['git'] = glob.glob('%s/*' % unpackTGZ.dir)[0]
        os.chdir(dirs['git'])
        git_buildpackage.GitInitDB()()
        git_buildpackage.GitAdd()(['.'])
        git_buildpackage.GitCommitAll()(
             msg="Imported %s version %s" % (['upstream', 'Debian'][src.native],
             src.upstream_version))
        tagger(sanitize_version(src.upstream_version))
        if not src.native:
            git_buildpackage.GitBranch()(upstream_branch)
    except git_buildpackage.CommandExecFailed:
        print >>sys.stderr,"Creation of git repository failed"
        git_buildpackage.RemoveTree(unpackTGZ.dir)()
        return False
    return True


def apply_debian_patch(src, dirs, tagger):
    """apply the debian patch and tag appropriately"""
    try:
        git_buildpackage.DpkgSourceExtract()(src.dscfile, dirs['dpkg-src'])
        os.chdir(dirs['git'])
        git_buildpackage.GitLoadDirs()(dirs['dpkg-src'], 'Imported Debian patch')
        tagger(sanitize_version('%s-%s' % (src.upstream_version, src.debian_version)))
    except git_buildpackage.CommandExecFailed:
        print >>sys.stderr,"Failed to import Debian package"
        return False
    return True


def move_tree(src, dirs):
    """rename the temporary unpack directory to it's final name"""
    try:
        os.rename(dirs['git'], src.pkg)
    except OSError, err:
        print >>sys.stderr, "Cannot move git repository '%s' to it's final location '%s': %s" % (dirs['git'],
              os.path.abspath(src.pkg), err)
        return False
    else:
        git_buildpackage.RemoveTree(dirs['tmp'])()
    return True


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

    parser = GBPOptionParser(command=os.path.basename(argv[0]), prefix='',
                             usage='%prog [options] /path/to/package.dsc')

    parser.add_option("-v", "--verbose", action="store_true", dest="verbose", default=False,
                      help="verbose command execution")
    parser.add_config_file_option(option_name="upstream-branch", dest="upstream_branch",
                      help="upstream branch, default is '%(upstream-branch)s'")
    parser.add_config_file_option(option_name="sign-tags", dest="sign_tags",
                      help="sign git tags", action="store_true")
    parser.add_config_file_option(option_name="keyid", dest="keyid",
                      help="GPG keyid to sign tags with")
    (options, args) = parser.parse_args(argv[1:])

    if options.verbose:
        git_buildpackage.Command.verbose = True

    gitTag = git_buildpackage.GitTag(options.sign_tags, options.keyid)

    if len(args) != 1:
        parser.print_help()
        return 1
    else:        
        src = parse_dsc(args[0])
        if not src:
            return 1

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

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