$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-z.git /var/lib/mock/f45-build-20275-569/root/chroot_tmpdir/scmroot/golang-modernc-z
Cloning into '/var/lib/mock/f45-build-20275-569/root/chroot_tmpdir/scmroot/golang-modernc-z'...
$ git fetch origin e665f9ec84d712094db9eaf699aa37fa44447fde:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-z
 * [new ref]         e665f9ec84d712094db9eaf699aa37fa44447fde -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e665f9e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild