$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-default-instances-containers.git /var/lib/mock/f38-build-side-42-init-devel-605185-26247/root/chroot_tmpdir/scmroot/ghc-data-default-instances-containers
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-605185-26247/root/chroot_tmpdir/scmroot/ghc-data-default-instances-containers'...
$ git fetch origin e34971d43e52582c0235d139f2ed216f2487ce9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-default-instances-containers
 * [new ref]         e34971d43e52582c0235d139f2ed216f2487ce9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e34971d Convert to %autorelease and %autochangelog