unikernel/duniverse/dune_/test/blackbox-tests/test-cases/read-only-symlink-target.t/run.t

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+Nix can leave a symlink to a store path in the tree, often called 'result'.
+'dune fmt' crashes because of that.
+
+  $ RESULT=`mktemp -d`
+  $ echo "let x  = 2" > "$RESULT/foo.ml"
+  $ chmod -R a-w "$RESULT"
+  $ ln -s "$RESULT" result
+
+This command should succeed:
+
+  $ dune fmt
+  File "ocamlformat.ml", line 1, characters 0-0:
+  Error: Files _build/default/ocamlformat.ml and
+  _build/default/.formatted/ocamlformat.ml differ.
+  File "result/foo.ml", line 1, characters 0-0:
+  Error: Files _build/default/result/foo.ml and
+  _build/default/result/.formatted/foo.ml differ.
+  Promoting _build/default/.formatted/ocamlformat.ml to ocamlformat.ml.
+  Promoting _build/default/result/.formatted/foo.ml to result/foo.ml.
+  Error: failed to promote result/foo.ml
+  Permission denied
+  [1]
+
+Allow Dune to remove temporary files (calling Dune crashes without this):
+
+  $ chmod -R u+w "$RESULT"