fix(pkg): improve locations for local path repos

bin/pkg/pkg_common.ml

@@ -105,7 +105,7 @@ let get_repos repos ~repositories ~update_opam_repositories =
        | `Git ->
          let* source = Opam_repo.Source.of_opam_url loc opam_url in
          Opam_repo.of_git_repo ~update:update_opam_repositories source
-       | `Path path -> Fiber.return @@ Opam_repo.of_opam_repo_dir_path path))
+       | `Path path -> Fiber.return @@ Opam_repo.of_opam_repo_dir_path loc path))
 ;;
 
 let find_local_packages =

src/dune_pkg/opam_repo.ml

@@ -134,34 +134,40 @@ let equal { source; serializable } t =
 
 let serializable { serializable; _ } = serializable
 
-let of_opam_repo_dir_path opam_repo_dir_path =
+let of_opam_repo_dir_path loc opam_repo_dir_path =
   (match Path.stat opam_repo_dir_path with
    | Error (Unix.ENOENT, _, _) ->
      User_error.raise
+       ~loc
        [ Pp.textf "%s does not exist" (Path.to_string_maybe_quoted opam_repo_dir_path) ]
    | Error _ ->
      User_error.raise
+       ~loc
        [ Pp.textf "could not read %s" (Path.to_string_maybe_quoted opam_repo_dir_path) ]
    | Ok { Unix.st_kind = S_DIR; _ } -> ()
    | Ok _ ->
      User_error.raise
+       ~loc
        [ Pp.textf "%s is not a directory" (Path.to_string_maybe_quoted opam_repo_dir_path)
        ]);
   (let packages = Path.append_local opam_repo_dir_path Paths.packages in
    match Path.stat packages with
    | Ok { Unix.st_kind = S_DIR; _ } -> ()
    | Ok _ ->
      User_error.raise
+       ~loc
        [ Pp.textf "%s is not a directory" (Path.to_string_maybe_quoted packages) ]
    | Error (Unix.ENOENT, _, _) ->
      User_error.raise
+       ~loc
        [ Pp.textf
            "%s doesn't look like a path to an opam repository as it lacks a subdirectory \
             named \"packages\""
            (Path.to_string_maybe_quoted opam_repo_dir_path)
        ]
    | Error _ ->
      User_error.raise
+       ~loc
        [ Pp.textf "could not read %s" (Path.to_string_maybe_quoted opam_repo_dir_path) ]);
   { source = Directory opam_repo_dir_path; serializable = None }
 ;;

src/dune_pkg/opam_repo.mli

@@ -36,7 +36,7 @@ end
 
 (** [of_opam_repo_dir_path opam_repo_dir] creates a repo represented by a local
     directory in the path given by [opam_repo_dir]. *)
-val of_opam_repo_dir_path : Path.t -> t
+val of_opam_repo_dir_path : Loc.t -> Path.t -> t
 
 (** [of_git_repo git ~update source] loads the opam repository located
     at [source] from git. [source] can be any URL that [git remote add]

test/blackbox-tests/test-cases/pkg/invalid-opam-repo-errors.t/run.t

@@ -14,7 +14,18 @@ Test the error cases for invalid opam repositories
   >  (source "file://$(pwd)/directory-that-does-not-exist"))
   > EOF
 
-  $ dune pkg lock
+  $ lock() {
+  > out="$(dune pkg lock 2>&1)"
+  > local code="$?"
+  > echo "$out" | sed 's/character.*:/characters X-X:/g' \
+  >   | sed 's/source ".*"/source ../g' \
+  >   | grep -v "\^"
+  > printf "[%d]\n" "$code"
+  > }
+
+  $ lock
+  File "dune-workspace", line 6, characters X-X:
+  6 |  (source ..))
   Error:
   $TESTCASE_ROOT/directory-that-does-not-exist
   does not exist
@@ -29,7 +40,9 @@ Test the error cases for invalid opam repositories
   >  (name mock)
   >  (source "file://$(pwd)/empty"))
   > EOF
-  $ dune pkg lock
+  $ lock
+  File "dune-workspace", line 6, characters X-X:
+  6 |  (source ..))
   Error:
   $TESTCASE_ROOT/empty
   is not a directory
@@ -43,7 +56,9 @@ Test the error cases for invalid opam repositories
   >  (name mock)
   >  (source "file://$(pwd)/no-packages-dir"))
   > EOF
-  $ dune pkg lock
+  $ lock
+  File "dune-workspace", line 6, characters X-X:
+  6 |  (source ..))
   Error:
   $TESTCASE_ROOT/no-packages-dir
   doesn't look like a path to an opam repository as it lacks a subdirectory