$ git clone -n https://src.fedoraproject.org/rpms/primecount.git /var/lib/mock/f40-build-2257872-54327/root/chroot_tmpdir/scmroot/primecount
Cloning into '/var/lib/mock/f40-build-2257872-54327/root/chroot_tmpdir/scmroot/primecount'...
$ git fetch origin 112a4719d081c6ffad4960b173ea60f123bfcac7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/primecount
 * [new ref]         112a4719d081c6ffad4960b173ea60f123bfcac7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 112a471 Fix source archive name