unikernel/duniverse/dune_/test/blackbox-tests/test-cases/pkg/additional-constraints-ocaml-system.t

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+Test that we support the use case of using additional constraints to force the
+system compiler to be used instead of installing the compiler.
+
+  $ . ./helpers.sh
+
+Create packages resembling the ocaml compiler packages
+  $ mkrepo
+
+  $ mkpkg ocaml-base-compiler <<EOF
+  > conflicts: [ "ocaml-system" "ocaml-variants" ]
+  > EOF
+
+  $ mkpkg ocaml-variants <<EOF
+  > conflicts: [ "ocaml-system" "ocaml-base-compiler" ]
+  > EOF
+
+  $ mkpkg ocaml-system <<EOF
+  > conflicts: [ "ocaml-variants" "ocaml-base-compiler" ]
+  > EOF
+
+  $ mkpkg ocaml <<EOF
+  > depends: [
+  >  "ocaml-base-compiler" | "ocaml-variants" | "ocaml-system"
+  > ]
+  > EOF
+
+A package that depends on ocaml:
+  $ cat > dune-project <<EOF
+  > (lang dune 3.13)
+  > (package
+  >  (name foo)
+  >  (depends ocaml))
+  > EOF
+
+Try solving without additional constraints:
+  $ add_mock_repo_if_needed
+  $ dune pkg lock
+  Solution for dune.lock:
+  - ocaml.0.0.1
+  - ocaml-base-compiler.0.0.1
+
+Now make a workspace file adding the constarint on ocaml-system:
+  $ cat >dune-workspace <<EOF
+  > (lang dune 3.13)
+  > (lock_dir
+  >  (constraints ocaml-system)
+  >  (repositories mock))
+  > (repository
+  >  (name mock)
+  >  (url "file://$(pwd)/mock-opam-repository"))
+  > EOF
+
+Solve again. This time ocaml-system is chosen.
+  $ dune pkg lock
+  Solution for dune.lock:
+  - ocaml.0.0.1
+  - ocaml-system.0.0.1