$ git clone -n https://src.fedoraproject.org/rpms/ghc-cryptohash.git /var/lib/mock/f39-build-2005936-44977/root/chroot_tmpdir/scmroot/ghc-cryptohash
Cloning into '/var/lib/mock/f39-build-2005936-44977/root/chroot_tmpdir/scmroot/ghc-cryptohash'...
$ git fetch origin fae738488782f720203ee68db00ab2118edb974a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cryptohash
 * [new ref]         fae738488782f720203ee68db00ab2118edb974a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fae7384 bump release