$ git clone -n https://src.fedoraproject.org/rpms/xgalaxy.git /var/lib/mock/f45-build-38886-730/root/chroot_tmpdir/scmroot/xgalaxy
Cloning into '/var/lib/mock/f45-build-38886-730/root/chroot_tmpdir/scmroot/xgalaxy'...
$ git fetch origin 979b2706d7cbf00b3509813e07cfeaaec479ecac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xgalaxy
 * [new ref]         979b2706d7cbf00b3509813e07cfeaaec479ecac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 979b270 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild