$ git clone -n https://src.fedoraproject.org/rpms/octave-metch.git /var/lib/mock/f45-build-20871-574/root/chroot_tmpdir/scmroot/octave-metch
Cloning into '/var/lib/mock/f45-build-20871-574/root/chroot_tmpdir/scmroot/octave-metch'...
$ git fetch origin bd916d6ce6fe43f4d926a7e2220f0f0e500aa055:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-metch
 * [new ref]         bd916d6ce6fe43f4d926a7e2220f0f0e500aa055 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd916d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild