Parsing Jenkins build history for broken XML files with xmllint

xmllint-jenkins-builds.sh

# 1) Jenkins uses XML 1.1 standard that did not pick up in the industry after 20 years.
#    So browsers and xmllint claim they do not know of it: https://stackoverflow.com/a/4508357
#    Jenkins docs suggest replacing with "1.0" should suffice: https://www.jenkins.io/doc/upgrade-guide/2.107/
# 2) changelogNNNNNNNNNN.xml files are not XML but git commit info in fact
# 3) Some of those are plain empty and upset xmllint
# 4) xmllint insists on having an input file, so after rewrites we give it /dev/stdin.
#    This path name may be a feature of bash and/or certain platforms.

find . -name '*.xml' | while read F ; do
    [ -s "$F" ] || continue;
    head -1 "$F" | grep -E '^commit' >/dev/null && continue;
    sed 's,xml version=.1.1. encoding=.UTF-8.,xml version="1.0" encoding="UTF-8",' \
        < "$F" | xmllint /dev/stdin >/dev/null \
        || echo "FAILED ($?) for $F" ;
done