$ git clone -n https://src.fedoraproject.org/rpms/ghc-NumInstances.git /var/lib/mock/f40-build-775912-128499/root/chroot_tmpdir/scmroot/ghc-NumInstances
Cloning into '/var/lib/mock/f40-build-775912-128499/root/chroot_tmpdir/scmroot/ghc-NumInstances'...
$ git fetch origin c5a7bf2093cebe65fe3c304b471a4ca417405e2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-NumInstances
 * [new ref]         c5a7bf2093cebe65fe3c304b471a4ca417405e2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5a7bf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild