$ git clone -n https://src.fedoraproject.org/rpms/xbg.git /var/lib/mock/f40-build-798601-141990/root/chroot_tmpdir/scmroot/xbg
Cloning into '/var/lib/mock/f40-build-798601-141990/root/chroot_tmpdir/scmroot/xbg'...
$ git fetch origin e61d2ca023891a4b04d71e9f2dd2ea43de069369:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xbg
 * [new ref]         e61d2ca023891a4b04d71e9f2dd2ea43de069369 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e61d2ca Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild