$ git clone -n https://src.fedoraproject.org/rpms/golang-github-juju-gnuflag.git /var/lib/mock/f45-build-12149-439/root/chroot_tmpdir/scmroot/golang-github-juju-gnuflag
Cloning into '/var/lib/mock/f45-build-12149-439/root/chroot_tmpdir/scmroot/golang-github-juju-gnuflag'...
$ git fetch origin 4cb444a41c0f951c628a460512dae1d826b037f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-juju-gnuflag
 * [new ref]         4cb444a41c0f951c628a460512dae1d826b037f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cb444a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild