$ git clone -n https://src.fedoraproject.org/rpms/loupe.git /var/lib/mock/f39-build-2192717-51476/root/chroot_tmpdir/scmroot/loupe
Cloning into '/var/lib/mock/f39-build-2192717-51476/root/chroot_tmpdir/scmroot/loupe'...
$ git fetch origin 67abc2b6ab46b8a52d370da28c991c2915c9d81e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/loupe
 * [new ref]         67abc2b6ab46b8a52d370da28c991c2915c9d81e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67abc2b Update to 45.3