$ git clone -n https://src.fedoraproject.org/rpms/golang-github-klauspost-compress.git /var/lib/mock/f40-build-2639650-66376/root/chroot_tmpdir/scmroot/golang-github-klauspost-compress
Cloning into '/var/lib/mock/f40-build-2639650-66376/root/chroot_tmpdir/scmroot/golang-github-klauspost-compress'...
$ git fetch origin 210fdda02d20c473d28654c5fe26ba61866e0d95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-klauspost-compress
 * [new ref]         210fdda02d20c473d28654c5fe26ba61866e0d95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 210fdda upload sources