#!/usr/bin/env python
#
# Extract build dependencies from an RPM .spec file.
#
# Copyright (C) 2014 Red Hat
#
# 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 sys
import re
import rpm

def usage(file):
    file.write(("Usage: %s SPEC\n" +
                "Extract build dependencies from an RPM .spec file.\n") %
               re.match(".*?([^/]+)$", sys.argv[0]).group(1))

if len(sys.argv) != 2:
    usage(sys.stderr)
    sys.exit(1)

spec = rpm.spec(sys.argv[1])
for d in rpm.ds(spec.sourceHeader, 'requires'):
    print d.DNEVR()[2:]
