$ git clone -n https://src.fedoraproject.org/rpms/maven-jar-plugin.git /var/lib/mock/f40-build-2622807-64918/root/chroot_tmpdir/scmroot/maven-jar-plugin
Cloning into '/var/lib/mock/f40-build-2622807-64918/root/chroot_tmpdir/scmroot/maven-jar-plugin'...
$ git fetch origin 2656c6b7f7f85051b87f324b7e4e0ede9229858f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-jar-plugin
 * [new ref]         2656c6b7f7f85051b87f324b7e4e0ede9229858f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2656c6b Rebuilt for java-21-openjdk as system jdk