$ git clone -n https://src.fedoraproject.org/rpms/golang-github-matrix-org-util.git /var/lib/mock/f45-build-12208-439/root/chroot_tmpdir/scmroot/golang-github-matrix-org-util
Cloning into '/var/lib/mock/f45-build-12208-439/root/chroot_tmpdir/scmroot/golang-github-matrix-org-util'...
$ git fetch origin e88772329bf747618e6aaf15f3801f3c5288aea8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-matrix-org-util
 * [new ref]         e88772329bf747618e6aaf15f3801f3c5288aea8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e887723 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild