$ git clone -n https://src.fedoraproject.org/rpms/octave-zmat.git /var/lib/mock/f45-build-20866-574/root/chroot_tmpdir/scmroot/octave-zmat
Cloning into '/var/lib/mock/f45-build-20866-574/root/chroot_tmpdir/scmroot/octave-zmat'...
$ git fetch origin 37ec1635309df0b0e0b2eb16071ee6691e78d5ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-zmat
 * [new ref]         37ec1635309df0b0e0b2eb16071ee6691e78d5ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37ec163 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild