$ git clone -n https://src.fedoraproject.org/rpms/plexus-archiver.git /var/lib/mock/f40-build-2630297-65649/root/chroot_tmpdir/scmroot/plexus-archiver
Cloning into '/var/lib/mock/f40-build-2630297-65649/root/chroot_tmpdir/scmroot/plexus-archiver'...
$ git fetch origin ca7510984d69d0d7b9aeb7b7dfbe32f8acd132ad:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-archiver
 * [new ref]         ca7510984d69d0d7b9aeb7b7dfbe32f8acd132ad -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca75109 Rebuilt for java-21-openjdk as system jdk