$ git clone -n https://src.fedoraproject.org/rpms/golang-gopkg-mgo-2.git /var/lib/mock/f39-build-1503897-34991/root/chroot_tmpdir/scmroot/golang-gopkg-mgo-2
Cloning into '/var/lib/mock/f39-build-1503897-34991/root/chroot_tmpdir/scmroot/golang-gopkg-mgo-2'...
$ git fetch origin c0c04f921dc8fbadc256e5cdb4596e2d007f9fa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gopkg-mgo-2
 * [new ref]         c0c04f921dc8fbadc256e5cdb4596e2d007f9fa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0c04f9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild