$ git clone -n https://src.fedoraproject.org/rpms/loupe.git /var/lib/mock/f45-build-43643-804/root/chroot_tmpdir/scmroot/loupe
Cloning into '/var/lib/mock/f45-build-43643-804/root/chroot_tmpdir/scmroot/loupe'...
$ git fetch origin a05c55e9eba63738668abf361173e3c48ee3f42e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/loupe
 * [new ref]         a05c55e9eba63738668abf361173e3c48ee3f42e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a05c55e Rebuild with gufo v0.5.3 to address RHBZ#2546588 for loupe