$ git clone -n https://src.fedoraproject.org/rpms/cosmic-store.git /var/lib/mock/f45-build-39629-750/root/chroot_tmpdir/scmroot/cosmic-store
Cloning into '/var/lib/mock/f45-build-39629-750/root/chroot_tmpdir/scmroot/cosmic-store'...
$ git fetch origin 43595675822ef20ac2ff3a4230b7e371641dc988:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-store
 * [new ref]         43595675822ef20ac2ff3a4230b7e371641dc988 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4359567 Update to 1.8.0