$ git clone -n https://src.fedoraproject.org/rpms/xlog.git /var/lib/mock/f45-build-38930-730/root/chroot_tmpdir/scmroot/xlog
Cloning into '/var/lib/mock/f45-build-38930-730/root/chroot_tmpdir/scmroot/xlog'...
$ git fetch origin a70537ddb6d941b3e5baeeecfe9e73ca8479c2dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xlog
 * [new ref]         a70537ddb6d941b3e5baeeecfe9e73ca8479c2dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a70537d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild