$ git clone -n https://src.fedoraproject.org/rpms/octave-image.git /var/lib/mock/f45-build-20851-574/root/chroot_tmpdir/scmroot/octave-image
Cloning into '/var/lib/mock/f45-build-20851-574/root/chroot_tmpdir/scmroot/octave-image'...
$ git fetch origin bbe624d2bc2fbf634cf85ca221299d3e3ee3afd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-image
 * [new ref]         bbe624d2bc2fbf634cf85ca221299d3e3ee3afd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbe624d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild