$ git clone -n https://src.fedoraproject.org/rpms/x11trace.git /var/lib/mock/f45-build-38556-725/root/chroot_tmpdir/scmroot/x11trace
Cloning into '/var/lib/mock/f45-build-38556-725/root/chroot_tmpdir/scmroot/x11trace'...
$ git fetch origin b4d38878f8e60eaeaa1b4643cdf85c95063ef7a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x11trace
 * [new ref]         b4d38878f8e60eaeaa1b4643cdf85c95063ef7a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4d3887 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild