unikernel/duniverse/dune_/test/blackbox-tests/test-cases/overlapping-deps.t

@@ -0,0 +1,111 @@
+Dune prevents overlapping dependencies. These are local dependencies whose names
+collide with dependencies already installed. This was introduced in
+https://github.com/ocaml/dune/pull/587
+
+First we prepare two external libraries where some_package1 depends on some_package2
+
+  $ mkdir external
+  $ cd external
+  $ cat >dune-project <<EOF
+  > (lang dune 2.8)
+  > (package (name some_package1))
+  > (package (name some_package2))
+  > EOF
+  $ cat >dune <<EOF
+  > (library
+  >  (name lib1)
+  >  (modules ())
+  >  (libraries some_package2)
+  >  (public_name some_package1))
+  > (library
+  >  (name lib2)
+  >  (modules ())
+  >  (public_name some_package2))
+  > EOF
+  $ dune build @install
+  $ cd ..
+
+Then we create a workspace with some_package2
+
+  $ mkdir use
+  $ cd use
+
+  $ mkdir proj1
+  $ cd proj1
+  $ cat >dune-project <<EOF
+  > (lang dune 2.8)
+  > (package (name some_package2))
+  > EOF
+  $ cat >dune <<EOF
+  > (library
+  >  (name lib1)
+  >  (modules ())
+  >  (public_name some_package2))
+  > EOF
+  $ cd ..
+
+Then we try to build a library that uses some_package1 which in turn
+depends on the overlapping some_package2:
+  $ mkdir proj2
+  $ cd proj2
+  $ cat >dune-project <<EOF
+  > (lang dune 2.8)
+  > EOF
+  $ cat >dune <<EOF
+  > (library
+  >  (name bar)
+  >  (libraries some_package1))
+  > EOF
+  $ touch bar.ml
+  $ cd ..
+
+And we see the error:
+  $ OCAMLPATH=$PWD/../external/_build/install/default/lib dune build %{cma:proj2/bar} --root .
+  Error: Conflict between the following libraries:
+  - "some_package2" in _build/default/proj1
+  - "some_package2" in
+    $TESTCASE_ROOT/use/../external/_build/install/default/lib/some_package2
+    -> required by library "some_package1" in
+       $TESTCASE_ROOT/use/../external/_build/install/default/lib/some_package1
+  -> required by _build/default/proj2/.bar.objs/byte/bar.cmo
+  -> required by _build/default/proj2/bar.cma
+  -> required by %{cma:proj2/bar} at command line:1
+  [1]
+
+We can fix the error by allow overlapping dependencies:
+  $ cat >proj2/dune <<EOF
+  > (library
+  >  (name bar)
+  >  (allow_overlapping_dependencies)
+  >  (libraries some_package1))
+  > EOF
+  $ OCAMLPATH=$PWD/../external/_build/install/default/lib dune build %{cma:proj2/bar} --root .
+
+Strangely, the error disappears if we remove the source for the bar lib:
+
+  $ cat >proj2/dune <<EOF
+  > (library
+  >  (name bar)
+  >  (libraries some_package1))
+  > EOF
+  $ rm proj2/bar.ml
+  $ OCAMLPATH=$PWD/../external/_build/install/default/lib dune build %{cma:proj2/bar} --root .
+
+We also make sure the error exists for executables:
+  $ cat >proj2/dune <<EOF
+  > (executable
+  >  (name bar)
+  >  (libraries some_package1))
+  > EOF
+  $ touch proj2/bar.ml
+  $ OCAMLPATH=$PWD/../external/_build/install/default/lib dune build ./proj2/bar.exe --root .
+  Error: Conflict between the following libraries:
+  - "some_package2" in _build/default/proj1
+  - "some_package2" in
+    $TESTCASE_ROOT/use/../external/_build/install/default/lib/some_package2
+    -> required by library "some_package1" in
+       $TESTCASE_ROOT/use/../external/_build/install/default/lib/some_package1
+  -> required by executable bar in proj2/dune:2
+  -> required by _build/default/proj2/.bar.eobjs/native/dune__exe__Bar.cmx
+  -> required by _build/default/proj2/bar.exe
+  [1]