$ git clone -n https://src.fedoraproject.org/rpms/libgsystem.git /var/lib/mock/f40-build-2611131-63912/root/chroot_tmpdir/scmroot/libgsystem
Cloning into '/var/lib/mock/f40-build-2611131-63912/root/chroot_tmpdir/scmroot/libgsystem'...
$ git fetch origin aa72f1a4096d3a9c7142b52bde2a7a1b5a134caa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgsystem
 * [new ref]         aa72f1a4096d3a9c7142b52bde2a7a1b5a134caa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa72f1a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild