$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-crypting.git /var/lib/mock/f41-build-847359-163983/root/chroot_tmpdir/scmroot/gap-pkg-crypting
Cloning into '/var/lib/mock/f41-build-847359-163983/root/chroot_tmpdir/scmroot/gap-pkg-crypting'...
$ git fetch origin ce58797241197a4c2a62e1734bb73ffe53a330a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-crypting
 * [new ref]         ce58797241197a4c2a62e1734bb73ffe53a330a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce58797 Version 0.10.5