$ git clone -n https://src.fedoraproject.org/rpms/gzip.git /var/lib/mock/f40-build-777666-129469/root/chroot_tmpdir/scmroot/gzip
Cloning into '/var/lib/mock/f40-build-777666-129469/root/chroot_tmpdir/scmroot/gzip'...
$ git fetch origin 3407b65673d7248b71716005159a3b84051d8544:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gzip
 * [new ref]         3407b65673d7248b71716005159a3b84051d8544 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3407b65 Update to gzip-1.13