$ git clone -n https://src.fedoraproject.org/rpms/jhead.git /var/lib/mock/f31-build-55715-28149/root/thebuilddir/tmp/scmroot/jhead
Cloning into '/var/lib/mock/f31-build-55715-28149/root/thebuilddir/tmp/scmroot/jhead'...
$ git reset --hard f901ebef68887396952075cbf50e21b483a92ff5
HEAD is now at f901ebe - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild