$ git clone -n https://src.fedoraproject.org/rpms/ghc-system-fileio.git /var/lib/mock/f42-build-3364943-45045/root/chroot_tmpdir/scmroot/ghc-system-fileio
Cloning into '/var/lib/mock/f42-build-3364943-45045/root/chroot_tmpdir/scmroot/ghc-system-fileio'...
$ git fetch origin 1a666637a50b7236a5639b92a9cffc0d69880c40:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-system-fileio
 * [new ref]         1a666637a50b7236a5639b92a9cffc0d69880c40 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a66663 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild