$ git clone -n https://src.fedoraproject.org/rpms/ghc-assoc.git /var/lib/mock/f40-build-2085765-50093/root/chroot_tmpdir/scmroot/ghc-assoc
Cloning into '/var/lib/mock/f40-build-2085765-50093/root/chroot_tmpdir/scmroot/ghc-assoc'...
$ git fetch origin c432b1e4057c3c419609e2b6efc3487ffacf4442:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-assoc
 * [new ref]         c432b1e4057c3c419609e2b6efc3487ffacf4442 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c432b1e https://hackage.haskell.org/package/assoc-1.1/changelog