$ git clone -n https://src.fedoraproject.org/rpms/ghc-time-compat.git /var/lib/mock/f39-build-1507402-35253/root/chroot_tmpdir/scmroot/ghc-time-compat
Cloning into '/var/lib/mock/f39-build-1507402-35253/root/chroot_tmpdir/scmroot/ghc-time-compat'...
$ git fetch origin b2182c28d1834b5285f28e6e5070dc5ba6e293a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-time-compat
 * [new ref]         b2182c28d1834b5285f28e6e5070dc5ba6e293a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2182c2 revised .cabal file