$ git clone -n https://src.fedoraproject.org/rpms/libgsystem.git /var/lib/mock/f40-build-2243474-53669/root/chroot_tmpdir/scmroot/libgsystem
Cloning into '/var/lib/mock/f40-build-2243474-53669/root/chroot_tmpdir/scmroot/libgsystem'...
$ git fetch origin 28d4ac9333fef392feedc0be402fc696e176ac52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgsystem
 * [new ref]         28d4ac9333fef392feedc0be402fc696e176ac52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28d4ac9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild