$ git clone -n https://src.fedoraproject.org/rpms/loupe.git /var/lib/mock/f42-build-3339823-41426/root/chroot_tmpdir/scmroot/loupe
Cloning into '/var/lib/mock/f42-build-3339823-41426/root/chroot_tmpdir/scmroot/loupe'...
$ git fetch origin 99815536c5002d9f5cd2475fcfcfd6b334853a0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/loupe
 * [new ref]         99815536c5002d9f5cd2475fcfcfd6b334853a0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9981553 Update to 47.4