$ git clone -n https://src.fedoraproject.org/rpms/libgsystem.git /var/lib/mock/f40-build-2297647-56477/root/chroot_tmpdir/scmroot/libgsystem
Cloning into '/var/lib/mock/f40-build-2297647-56477/root/chroot_tmpdir/scmroot/libgsystem'...
$ git fetch origin 74d78bd011f384d38b3948f0d3ef70517a334d28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgsystem
 * [new ref]         74d78bd011f384d38b3948f0d3ef70517a334d28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74d78bd Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild