$ git clone -n https://src.fedoraproject.org/rpms/ghc-cryptohash.git /var/lib/mock/f41-build-side-1-3079824-38944/root/chroot_tmpdir/scmroot/ghc-cryptohash
Cloning into '/var/lib/mock/f41-build-side-1-3079824-38944/root/chroot_tmpdir/scmroot/ghc-cryptohash'...
$ git fetch origin fcdb75778546a45b7dfe6fee6654b9929cd20cdd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cryptohash
 * [new ref]         fcdb75778546a45b7dfe6fee6654b9929cd20cdd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcdb757 Retired: https://pagure.io/releng/issue/12387