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#!/usr/bin/python3
# Merges a downstream releases.xml file with the upstream metainfo.xml.
#
# Opens the metainfo file, finds the <releases> tag, and replaces its contents
# with the contents of the <releases> tag found in the releases file.
#
# This facilitates keeping a downstream changelog, not shipped in tarballs.
#
# This substitution is meant to be done at `make install` time. Set the
# `DOWNSTREAM_RELEASES_XML` environment variable while calling `make install`.
import argparse
import xml.etree.ElementTree as ET
parser = argparse.ArgumentParser()
parser.add_argument('metainfo')
parser.add_argument('releases')
args = parser.parse_args()
releases = ET.parse(args.releases)
releases_releases = releases.find('releases')
assert releases_releases is not None
metainfo = ET.parse(args.metainfo)
metainfo_releases = metainfo.find('releases')
assert metainfo_releases is not None
stub_release = metainfo_releases.find('release')
if stub_release is not None:
metainfo_releases.remove(stub_release)
metainfo_releases.extend(releases_releases)
metainfo.write(args.metainfo, encoding='utf-8', xml_declaration=True)
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