$ git clone -n https://src.fedoraproject.org/rpms/ghc-mwc-random.git /var/lib/mock/f40-build-2665933-67104/root/chroot_tmpdir/scmroot/ghc-mwc-random
Cloning into '/var/lib/mock/f40-build-2665933-67104/root/chroot_tmpdir/scmroot/ghc-mwc-random'...
$ git fetch origin c304dca71a723ce8c9eea49c13d523e3cfa10c6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mwc-random
 * [new ref]         c304dca71a723ce8c9eea49c13d523e3cfa10c6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c304dca Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild