$ git clone -n https://src.fedoraproject.org/rpms/mbuffer.git /var/lib/mock/f40-build-2297075-56437/root/chroot_tmpdir/scmroot/mbuffer
Cloning into '/var/lib/mock/f40-build-2297075-56437/root/chroot_tmpdir/scmroot/mbuffer'...
$ git fetch origin a61de3c0c68b353389b9117772cea05f57fe3153:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbuffer
 * [new ref]         a61de3c0c68b353389b9117772cea05f57fe3153 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a61de3c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild