$ git clone -n https://src.fedoraproject.org/rpms/sahara-image-elements.git /var/lib/mock/f39-build-2512492-61701/root/chroot_tmpdir/scmroot/sahara-image-elements
Cloning into '/var/lib/mock/f39-build-2512492-61701/root/chroot_tmpdir/scmroot/sahara-image-elements'...
$ git fetch origin fdc9252bd46721f0a993e50cfe50a7d5c01f3312:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sahara-image-elements
 * [new ref]         fdc9252bd46721f0a993e50cfe50a7d5c01f3312 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdc9252 Initial setup of the repo