rebar3: add rebar3WithPlugins

doc/languages-frameworks/beam.section.md

@@ -24,6 +24,10 @@ Many Erlang/OTP distributions available in `beam.interpreters` have versions wit
 
 We provide a version of Rebar3, under `rebar3`. We also provide a helper to fetch Rebar3 dependencies from a lockfile under `fetchRebar3Deps`.
 
+We also provide a version on Rebar3 with plugins included, under `rebar3WithPlugins`. This package is a function which takes two arguments: `plugins`, a list of nix derivations to include as plugins (loaded only when specified in `rebar.config`), and `globalPlugins`, which should always be loaded by rebar3. Example: `rebar3WithPlugins { globalPlugins = [beamPackages.pc]; }`.
+
+When adding a new plugin it is important that the `packageName` attribute is the same as the atom used by rebar3 to refer to the plugin.
+
 ### Mix & Erlang.mk {#build-tools-other}
 
 Erlang.mk works exactly as expected. There is a bootstrap process that needs to be run, which is supported by the `buildErlangMk` derivation.

pkgs/development/beam-modules/default.nix

@@ -18,8 +18,8 @@ let
       inherit callPackage erlang;
       beamPackages = self;
 
+      inherit (callPackage ../tools/build-managers/rebar3 { }) rebar3 rebar3WithPlugins;
       rebar = callPackage ../tools/build-managers/rebar { };
-      rebar3 = callPackage ../tools/build-managers/rebar3 { };
 
       # rebar3 port compiler plugin is required by buildRebar3
       pc = callPackage ./pc { };

pkgs/development/tools/build-managers/rebar3/default.nix

@@ -1,71 +1,104 @@
 { lib, stdenv, fetchFromGitHub,
-  fetchHex, erlang,
-  tree }:
+  fetchHex, erlang, makeWrapper }:
 
 let
   version = "3.15.1";
+  owner = "erlang";
+  deps = import ./rebar-deps.nix { inherit fetchHex fetchFromGitHub; };
+  rebar3 = stdenv.mkDerivation rec {
+    pname = "rebar3";
+    inherit version erlang;
 
-  # Dependencies should match the ones in:
-  # https://github.com/erlang/rebar3/blob/${version}/rebar.lock
-  # `sha256` could also be taken from https://hex.pm - Checksum
-  deps = import ./rebar-deps.nix { inherit fetchHex; };
-in
-stdenv.mkDerivation rec {
-  pname = "rebar3";
-  inherit version erlang;
+    # How to obtain `sha256`:
+    # nix-prefetch-url --unpack https://github.com/erlang/rebar3/archive/${version}.tar.gz
+    src = fetchFromGitHub {
+      inherit owner;
+      repo = pname;
+      rev = version;
+      sha256 = "1pcy5m79g0l9l3d8lkbx6cq1w87z1g3sa6wwvgbgraj2v3wkyy5g";
+    };
+
+    bootstrapper = ./rebar3-nix-bootstrap;
+
+    buildInputs = [ erlang ];
+
+    postPatch = ''
+      mkdir -p _checkouts _build/default/lib/
+
+      ${toString (lib.mapAttrsToList (k: v: ''
+        cp -R --no-preserve=mode ${v} _checkouts/${k}
+      '') deps)}
+
+      # Bootstrap script expects the dependencies in _build/default/lib
+      # TODO: Make it accept checkouts?
+      for i in _checkouts/* ; do
+          ln -s $(pwd)/$i $(pwd)/_build/default/lib/
+      done
+    '';
+
+    buildPhase = ''
+      HOME=. escript bootstrap
+    '';
+
+    installPhase = ''
+      mkdir -p $out/bin
+      cp rebar3 $out/bin/rebar3
+    '';
+
+    meta = {
+      homepage = "https://github.com/rebar/rebar3";
+      description = "Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases";
+
+      longDescription = ''
+        rebar is a self-contained Erlang script, so it's easy to distribute or
+        even embed directly in a project. Where possible, rebar uses standard
+        Erlang/OTP conventions for project structures, thus minimizing the amount
+        of build configuration work. rebar also provides dependency management,
+        enabling application writers to easily re-use common libraries from a
+        variety of locations (hex.pm, git, hg, and so on).
+        '';
+
+      platforms = lib.platforms.unix;
+      maintainers = lib.teams.beam.members;
+      license = lib.licenses.asl20;
+    };
 
-  # How to obtain `sha256`:
-  # nix-prefetch-url --unpack https://github.com/erlang/rebar3/archive/${version}.tar.gz
-  src = fetchFromGitHub {
-    owner = "erlang";
-    repo = pname;
-    rev = version;
-    sha256 = "1pcy5m79g0l9l3d8lkbx6cq1w87z1g3sa6wwvgbgraj2v3wkyy5g";
   };
+  rebar3WithPlugins = { plugins ? [ ], globalPlugins ? [ ] }:
+    let
+      pluginLibDirs = map (p: "${p}/lib/erlang/lib") (lib.unique (plugins ++ globalPlugins));
+      globalPluginNames = lib.unique (map (p: p.packageName) globalPlugins);
+      rebar3Patched = (rebar3.overrideAttrs (old: {
 
-  bootstrapper = ./rebar3-nix-bootstrap;
+        # skip-plugins.patch is necessary because otherwise rebar3 will always
+        # try to fetch plugins if they are not already present in _build.
+        #
+        # global-deps.patch makes it possible to use REBAR_GLOBAL_PLUGINS to
+        # instruct rebar3 to always load a certain plugin. It is necessary since
+        # REBAR_GLOBAL_CONFIG_DIR doesn't seem to work for this.
+        patches = [ ./skip-plugins.patch ./global-plugins.patch ];
+      }));
+    in stdenv.mkDerivation {
+      pname = "rebar3-with-plugins";
+      inherit (rebar3) version bootstrapper;
+      nativeBuildInputs = [ erlang makeWrapper ];
+      unpackPhase = "true";
 
-  buildInputs = [ erlang tree ];
+      # Here we extract the rebar3 escript (like `rebar3_prv_local_install.erl`) and
+      # add plugins to the code path.
 
-  postPatch = ''
-    mkdir -p _checkouts
-    mkdir -p _build/default/lib/
-
-    ${toString (lib.mapAttrsToList (k: v: ''
-      cp -R --no-preserve=mode ${v} _checkouts/${k}
-    '') deps)}
-
-    # Bootstrap script expects the dependencies in _build/default/lib
-    # TODO: Make it accept checkouts?
-    for i in _checkouts/* ; do
-        ln -s $(pwd)/$i $(pwd)/_build/default/lib/
-    done
-  '';
-
-  buildPhase = ''
-    HOME=. escript bootstrap
-  '';
-
-  installPhase = ''
-    mkdir -p $out/bin
-    cp rebar3 $out/bin/rebar3
-  '';
-
-  meta = {
-    homepage = "https://github.com/rebar/rebar3";
-    description = "Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases";
-
-    longDescription = ''
-      rebar is a self-contained Erlang script, so it's easy to distribute or
-      even embed directly in a project. Where possible, rebar uses standard
-      Erlang/OTP conventions for project structures, thus minimizing the amount
-      of build configuration work. rebar also provides dependency management,
-      enabling application writers to easily re-use common libraries from a
-      variety of locations (hex.pm, git, hg, and so on).
+      installPhase = ''
+        erl -noshell -eval '
+          {ok, Escript} = escript:extract("${rebar3Patched}/bin/rebar3", []),
+          {archive, Archive} = lists:keyfind(archive, 1, Escript),
+          {ok, _} = zip:extract(Archive, [{cwd, "'$out/lib'"}]),
+          init:stop(0)
+        '
+        mkdir -p $out/bin
+        makeWrapper ${erlang}/bin/erl $out/bin/rebar3 \
+          --set REBAR_GLOBAL_PLUGINS "${toString globalPluginNames}" \
+          --suffix-each ERL_LIBS ":" "$out/lib ${toString pluginLibDirs}" \
+          --add-flags "+sbtu +A1 -noshell -boot start_clean -s rebar3 main -extra"
       '';
-
-    platforms = lib.platforms.unix;
-    maintainers = lib.teams.beam.members;
-    license = lib.licenses.asl20;
-  };
-}
+    };
+in { inherit rebar3 rebar3WithPlugins; }

pkgs/development/tools/build-managers/rebar3/global-plugins.patch

@@ -0,0 +1,14 @@
+diff --git a/src/rebar_plugins.erl b/src/rebar_plugins.erl
+index f2d22233..bee2cf18 100644
+--- a/src/rebar_plugins.erl
++++ b/src/rebar_plugins.erl
+@@ -30,7 +30,8 @@ project_plugins_install(State) ->
+ top_level_install(State) ->
+     Profiles = rebar_state:current_profiles(State),
+     lists:foldl(fun(Profile, StateAcc) ->
+-                        Plugins = rebar_state:get(State, {plugins, Profile}, []),
++                        Plugins = rebar_state:get(State, {plugins, Profile}, [])
++                            ++ [list_to_atom(P) || P <- string:lexemes(os:getenv("REBAR_GLOBAL_PLUGINS", ""), " ")],
+                         handle_plugins(Profile, Plugins, StateAcc)
+                 end, State, Profiles).
+ 

pkgs/development/tools/build-managers/rebar3/skip-plugins.patch

@@ -0,0 +1,54 @@
+diff --git a/src/rebar_plugins.erl b/src/rebar_plugins.erl
+index f2d22233..c61fa553 100644
+--- a/src/rebar_plugins.erl
++++ b/src/rebar_plugins.erl
+@@ -106,31 +106,9 @@ handle_plugins(Profile, Plugins, State, Upgrade) ->
+     State3 = rebar_state:set(State2, deps_dir, DepsDir),
+     rebar_state:lock(State3, Locks).
+ 
+-handle_plugin(Profile, Plugin, State, Upgrade) ->
++handle_plugin(_Profile, Plugin, State, _Upgrade) ->
+     try
+-        {Apps, State2} = rebar_prv_install_deps:handle_deps_as_profile(Profile, State, [Plugin], Upgrade),
+-        {no_cycle, Sorted} = rebar_prv_install_deps:find_cycles(Apps),
+-        ToBuild = rebar_prv_install_deps:cull_compile(Sorted, []),
+-
+-        %% Add already built plugin deps to the code path
+-        ToBuildPaths = [rebar_app_info:ebin_dir(A) || A <- ToBuild],
+-        PreBuiltPaths = [Ebin || A <- Apps,
+-                                 Ebin <- [rebar_app_info:ebin_dir(A)],
+-                                 not lists:member(Ebin, ToBuildPaths)],
+-        code:add_pathsa(PreBuiltPaths),
+-
+-        %% Build plugin and its deps
+-        build_plugins(ToBuild, Apps, State2),
+-
+-        %% Add newly built deps and plugin to code path
+-        State3 = rebar_state:update_all_plugin_deps(State2, Apps),
+-        NewCodePaths = [rebar_app_info:ebin_dir(A) || A <- ToBuild],
+-
+-        %% Store plugin code paths so we can remove them when compiling project apps
+-        State4 = rebar_state:update_code_paths(State3, all_plugin_deps, PreBuiltPaths++NewCodePaths),
+-        rebar_paths:set_paths([plugins], State4),
+-
+-        {plugin_providers(Plugin), State4}
++        {plugin_providers(Plugin), State}
+     catch
+         ?WITH_STACKTRACE(C,T,S)
+             ?DEBUG("~p ~p ~p", [C, T, S]),
+@@ -138,15 +116,6 @@ handle_plugin(Profile, Plugin, State, Upgrade) ->
+             {[], State}
+     end.
+ 
+-build_plugins(MustBuildApps, AllApps, State) ->
+-    State1 = rebar_state:deps_to_build(State, MustBuildApps),
+-    State2 = rebar_state:all_deps(State1, AllApps),
+-    State3 = rebar_state:set(State2, deps_dir, ?DEFAULT_PLUGINS_DIR),
+-    {Args, Extra} = rebar_state:command_parsed_args(State),
+-    State4 = rebar_state:command_parsed_args(State3, {[{deps_only, true}|Args], Extra}),
+-    rebar_prv_compile:do(State4),
+-    ok.
+-
+ plugin_providers({Plugin, _, _, _}) when is_atom(Plugin) ->
+     validate_plugin(Plugin);
+ plugin_providers({Plugin, _, _}) when is_atom(Plugin) ->

pkgs/top-level/all-packages.nix

@@ -11855,7 +11855,7 @@ in
   erlang_nox = beam_nox.interpreters.erlang;
 
   inherit (beam.packages.erlang)
-    rebar rebar3
+    rebar rebar3 rebar3WithPlugins
     fetchHex beamPackages
     relxExe;