#! /usr/bin/python
# 
#   update-maintainer - this script is used to update the Maintainer field of an
#                       Ubuntu package, as approved by the Ubuntu Technical
#                       Board at:
#
#       https://lists.ubuntu.com/archives/ubuntu-devel/2009-May/028213.html
#
#   Copyright (C) 2009 Jonathan Davies <jpds@ubuntu.com>
#
#   Original shell script was:
#
#   Copyright 2007 (C) Albin Tonnerre (Lutin) <lut1n.tne@gmail.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, either version 3 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, see <http://www.gnu.org/licenses/>.
#

import os
import re
import sys
import ubuntutools.packages

valid_locations = ["debian/control", "control"]
control_file_found = False

# Check changelog file exists.
for location in valid_locations:
    if os.path.exists(location):
         control_file_found = True
         control_file = location
         break # Stop looking.

# Check if we've found a control file.
if not control_file_found:
   sys.stderr.write("Unable to find debian/control file.\n")
   sys.exit(1)

# Read found file contents.
debian_control_file = open(control_file, "r")
file_contents = debian_control_file.read()
debian_control_file.close()

# Check if there is a Maintainer field in file found.
if not 'Maintainer' in file_contents:
    sys.stderr.write("Unable to find Maintainer field in %s.\n" % control_file)
    sys.exit(1)

package_field = re.findall('(Source:) (.*)', file_contents)
package_name = package_field[0][1]

# Get maintainer field information.
maintainer_field = re.findall('(Maintainer:) (.*) (<.*>)', file_contents)

# Split out maintainer name and email address.
maintainer_name = maintainer_field[0][1]
maintainer_mail = maintainer_field[0][2]

if maintainer_mail.find("@ubuntu.com") != -1:
    print "Maintainer email is set to an @ubuntu.com address - doing nothing."
    sys.exit(0)

# Check if Maintainer field is as approved in TB decision.
if 'Ubuntu Developers' in maintainer_name and \
    '<ubuntu-devel-discuss@lists.ubuntu.com>' in maintainer_mail:
    print "Ubuntu Developers is already set as maintainer."
    sys.exit(0)

if not ubuntutools.packages.checkIsInDebian(package_name, 'unstable'):
    user_email_address = os.getenv('DEBEMAIL')
    if not user_email_address:
        sys.stderr.write('The environment variable DEBEMAIL needs to be ' +\
            'set to make proper use of this script.\n')
    	sys.exit(1)
    target_maintainer = user_email_address
else:
    target_maintainer = "Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>"

# Set original maintainer field in a string.
original_maintainer = maintainer_name + " " + maintainer_mail
final_addition = target_maintainer + "\nXSBC-Original-Maintainer: " + original_maintainer

print "The original maintainer for this package is: " + original_maintainer
print "Resetting as: " + target_maintainer

# Replace text.
debian_control_file = open(control_file, "w")
debian_control_file.write(re.sub(original_maintainer, final_addition, file_contents))
debian_control_file.close()