$ git clone -n https://src.fedoraproject.org/rpms/ghc-kan-extensions.git /var/lib/mock/f38-build-side-42-init-devel-904789-28620/root/chroot_tmpdir/scmroot/ghc-kan-extensions
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-904789-28620/root/chroot_tmpdir/scmroot/ghc-kan-extensions'...
$ git fetch origin d99ee15d5743424c009256a6f99ed95a7b477110:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-kan-extensions
 * [new ref]         d99ee15d5743424c009256a6f99ed95a7b477110 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d99ee15 update to 5.2.5