$ git clone -n https://src.fedoraproject.org/rpms/golang-github-fvbommel-util.git /var/lib/mock/f45-build-11923-436/root/chroot_tmpdir/scmroot/golang-github-fvbommel-util
Cloning into '/var/lib/mock/f45-build-11923-436/root/chroot_tmpdir/scmroot/golang-github-fvbommel-util'...
$ git fetch origin 2107670cadb0d2bc4440273064b651a3144ea34b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-fvbommel-util
 * [new ref]         2107670cadb0d2bc4440273064b651a3144ea34b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2107670 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild