#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2008-2010 Martin Pitt <martin.pitt@canonical.com>
#
# ##################################################################
#
# 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; version 3.
# 
# 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.
#
# See file /usr/share/common-licenses/GPL-3 for more details.
#
# ##################################################################

import os, os.path, sys, urllib, subprocess, shutil
from ubuntutools.requestsync.lp import getUbuntuSrcPkg

def retrieve_file(url):
    '''Download file (by URL)  to the current directory.

    If the file is already present, this function does nothing.'''

    fname = os.path.basename(url)
    if not os.path.exists(fname):
	print 'downloading', url
	urllib.urlretrieve(url, fname)

def dsc_getfiles(dsc):
    '''Return list of files in a .dsc file (excluding the .dsc file itself).'''

    f = open(dsc)
    files = []

    # skip until 'Files:'
    for l in f:
	if l.strip() == 'Files:':
	    break

    for l in f:
	if l.strip() == '':
	    break
	fname = l.split()[2]
	if not fname.endswith('.dsc'):
	    files.append(fname)

    f.close()
    return files

#
# entry point
#

if len(sys.argv) != 3:
    print 'Usage: syncpackage <.dsc URL or path> <target release>'
    sys.exit (1)

(dscurl, release) = sys.argv[1:]
dscname = os.path.basename(dscurl)
basepath = os.path.dirname(dscurl)
(srcpkg, new_ver) = dscname.split('_')
new_ver = new_ver[:-4] # strip off '.dsc'

cur_ver = getUbuntuSrcPkg(srcpkg, release).getVersion()

retrieve_file(dscurl)
files = dsc_getfiles(dscname)

# do we need the orig.tar.gz?
need_orig = True
if cur_ver.find('-') > 0 and new_ver.find('-') > 0 and \
    cur_ver.split('-')[0] == new_ver.split('-')[0]:
    need_orig = False
    #files = [f for f in files if not f.endswith('orig.tar.gz')]

print 'Source %s: current version %s, new version %s' % (srcpkg, cur_ver, new_ver)
print 'needs orig.tar.gz', need_orig
print 'Files:', files
for f in files:
    retrieve_file(os.path.join(basepath, f))

uidx = cur_ver.find('ubuntu')
if uidx > 0:
    cur_ver = cur_ver[:uidx]
    print 'WARNING! Overwriting modified Ubuntu version, setting current version to', cur_ver

uidx = cur_ver.find('build')
if uidx > 0:
    cur_ver = cur_ver[:uidx]

orig_arg = ''
if need_orig:
    orig_arg = '-sa'

# extract package, build Source
assert subprocess.call(['dpkg-source', '-x', dscname]) == 0
os.chdir(srcpkg + '-' + new_ver.split('-')[0])
assert subprocess.call("dpkg-genchanges -q -S %s -v%s -e\"$(getent passwd $(id -u)|cut -f5 -d:|cut -f1 -d,) <$DEBEMAIL>\" | \
    	sed 's/^Distribution:.*$/Distribution: %s/; 1 i\Origin: debian/unstable' > ../%s_%s_source.changes" % 
	(orig_arg, cur_ver, release, srcpkg, new_ver), shell=True) == 0
os.chdir('..')
shutil.rmtree(srcpkg + '-' + new_ver.split('-')[0], True)
assert subprocess.call("debsign %s_%s_source.changes" % (srcpkg, new_ver), shell=True) == 0