$ git clone -n https://src.fedoraproject.org/rpms/gjs.git /var/lib/mock/f38-build-side-42-init-devel-745795-27658/root/chroot_tmpdir/scmroot/gjs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-745795-27658/root/chroot_tmpdir/scmroot/gjs'...
$ git fetch origin a2646f7eeb185306d0560cd3b358271e51db58fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gjs
 * [new ref]         a2646f7eeb185306d0560cd3b358271e51db58fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2646f7 Update to 1.76.0