$ git clone -n https://src.fedoraproject.org/rpms/openbox-theme-mistral-thin.git /var/lib/mock/f45-build-21005-577/root/chroot_tmpdir/scmroot/openbox-theme-mistral-thin
Cloning into '/var/lib/mock/f45-build-21005-577/root/chroot_tmpdir/scmroot/openbox-theme-mistral-thin'...
$ git fetch origin 58c649ba97b585346f48144b5c1825a19aea86d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openbox-theme-mistral-thin
 * [new ref]         58c649ba97b585346f48144b5c1825a19aea86d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58c649b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild