$ git clone -n https://src.fedoraproject.org/rpms/octave-miscellaneous.git /var/lib/mock/f45-build-20861-574/root/chroot_tmpdir/scmroot/octave-miscellaneous
Cloning into '/var/lib/mock/f45-build-20861-574/root/chroot_tmpdir/scmroot/octave-miscellaneous'...
$ git fetch origin 5b8505bc9f55dcc810a7944fc20ecfa8118ab829:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-miscellaneous
 * [new ref]         5b8505bc9f55dcc810a7944fc20ecfa8118ab829 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b8505b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild