unikernel/duniverse/dune_/test/blackbox-tests/test-cases/dynamic-dependencies/read-macro-produces-dyn-deps.t

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+Tests for dynamic dependencies computed from the `%{read:...}` family of macros
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.0)
+  > EOF
+
+Define rules have dynamic file dependencies
+
+  $ cat > dune <<EOF
+  > (rule
+  >  (target deps.d)
+  >  (action
+  >   (system "echo 'depA\ndepB' > %{target}")))
+  > 
+  > (rule
+  >  (target depA)
+  >  (action
+  >   (system "echo contentsA > %{target}")))
+  > 
+  > (rule
+  >  (target depB)
+  >  (action
+  >   (system "echo contentsB > %{target}")))
+  > EOF
+
+Now we define a rule that reads `deps.d` to figure out what to build.
+
+  $ cat >> dune <<EOF
+  > (rule
+  >  (target output)
+  >  (deps %{read-lines:./deps.d})
+  >  (action
+  >   (progn
+  >    (system "cat %{deps}")
+  >    (system "echo %{deps} > %{target}"))))
+  > EOF
+
+Building `./output` should now produce a file with contents "depA depB"
+
+  $ dune build ./output --display=short
+            sh deps.d
+            sh depA
+            sh depB
+            sh output
+  contentsA
+  contentsB
+            sh output
+
+  $ cat ./_build/default/output
+  depA depB