$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-hap.git /var/lib/mock/f39-build-1648750-40450/root/chroot_tmpdir/scmroot/gap-pkg-hap
Cloning into '/var/lib/mock/f39-build-1648750-40450/root/chroot_tmpdir/scmroot/gap-pkg-hap'...
$ git fetch origin c4baf442d5dd07ca682d4691cab0a23ef70cb589:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-hap
 * [new ref]         c4baf442d5dd07ca682d4691cab0a23ef70cb589 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4baf44 Version 1.60, non-bootstrap build