$ git clone -n https://src.fedoraproject.org/rpms/bridge-utils.git /var/lib/mock/f45-build-4054-330/root/chroot_tmpdir/scmroot/bridge-utils
Cloning into '/var/lib/mock/f45-build-4054-330/root/chroot_tmpdir/scmroot/bridge-utils'...
$ git fetch origin c6dc6bcb911f22349ac9076670b7a1988af1474b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bridge-utils
 * [new ref]         c6dc6bcb911f22349ac9076670b7a1988af1474b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6dc6bc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild