$ git clone -n https://src.fedoraproject.org/rpms/golang-github-guregu-null.git /var/lib/mock/f40-build-2667916-67176/root/chroot_tmpdir/scmroot/golang-github-guregu-null
Cloning into '/var/lib/mock/f40-build-2667916-67176/root/chroot_tmpdir/scmroot/golang-github-guregu-null'...
$ git fetch origin 1aa510d8f80dc288706a4e9bcca56c35e4e63695:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-guregu-null
 * [new ref]         1aa510d8f80dc288706a4e9bcca56c35e4e63695 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1aa510d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild