$ git clone -n https://src.fedoraproject.org/rpms/ghc-Diff.git /var/lib/mock/f40-build-775903-128499/root/chroot_tmpdir/scmroot/ghc-Diff
Cloning into '/var/lib/mock/f40-build-775903-128499/root/chroot_tmpdir/scmroot/ghc-Diff'...
$ git fetch origin 30b0867d34c49c3fbde7a0090bb7860feb793c3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-Diff
 * [new ref]         30b0867d34c49c3fbde7a0090bb7860feb793c3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30b0867 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild