$ git clone -n https://src.fedoraproject.org/rpms/distrobox.git /var/lib/mock/f42-build-3273931-41313/root/chroot_tmpdir/scmroot/distrobox
Cloning into '/var/lib/mock/f42-build-3273931-41313/root/chroot_tmpdir/scmroot/distrobox'...
$ git fetch origin 8c98d831f98bbab78f5a38b3ad232ec8c6a9c1e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/distrobox
 * [new ref]         8c98d831f98bbab78f5a38b3ad232ec8c6a9c1e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c98d83 Update to 1.8.1.2