Use bundle_data and create_bundle to add support for iOS app bundle.

build/config/ios/rules.gni

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-ios_app_script = "//build/config/ios/ios_app.py"
+import("//build/config/ios/ios_sdk.gni")
 
-template("code_sign_ios") {
-  assert(defined(invoker.entitlements_path),
-         "The path to the entitlements .xcent file")
-  assert(defined(invoker.identity), "The code signing identity")
-  assert(defined(invoker.application_path), "The application to code sign")
-  assert(defined(invoker.deps))
+# TODO(crbug.com/297668): refactor this template to extract common behaviour
+# between OS X and iOS bundle generation, then create a generic "app" template
+# that forward to "executable" on all platform except iOS/OS X.
+template("ios_app") {
+  # The application name defaults to target_name.
+  _app_name = target_name
+  if (defined(invoker.app_name)) {
+    _app_name = invoker.app_name
+  }
 
-  action(target_name) {
+  # Declare the name of the target creating the application bundle so that
+  # other targets can use it when setting "visibility". The target is named
+  # $target_name.app as it allows use to use the application name as argument
+  # to ninja during the build.
+  _create_app_bundle = target_name + ".app"

[Dirk Pranke, 2016/03/01 23:56:30]

This is a bit confusing to me. Is _create_app_bundle supposed to refer to the
generated GN label, or the directory name of the bundle, or both? Can we split
these apart? It's strange to have a file extension be in the label name.

[sdefresne, 2016/03/11 17:57:12]

Done, but now I get the following error:

$ ninja -C out/Default base_unittest.app
ninja: Entering directory `out/Default'
ninja: error: unknown target 'base_unittest.app'

I've added a comment to find a way to fix this.

+
+  # Declare the name of some target as they have circular dependency via
+  # "visibility" and "deps".
+  _generate_info_plist = target_name + "_generate_info_plist"
+  _bundle_data_info_plist = target_name + "_bundle_data_info_plist"
+
+  # Perform variable substitutions in the Info.plist and convert it to
+  # binary1 format.
+  action(_generate_info_plist) {
+    visibility = [ ":$_bundle_data_info_plist" ]
+    script = "//build/config/ios/ios_gen_plist.py"
     sources = [
-      invoker.entitlements_path,
+      "//build/config/ios/BuildInfo.plist",
+      invoker.info_plist,
     ]
+    outputs = [
+      "$target_gen_dir/$target_name/Info.plist",
+    ]
+    extra_args = []
+    if (defined(invoker.extra_substitutions)) {
+      foreach(substitution, invoker.extra_substitutions) {
+        extra_args += [ "-s=$substitution" ]
+      }
+    }
+    args = extra_args + [
+             "-s=BUILD_MACHINE_OS_BUILD=$machine_os_build",
+             "-s=EXECUTABLE_NAME=$_app_name",
+             "-s=GCC_VERSION=com.apple.compilers.llvm.clang.1_0",
+             "-s=IOS_DEPLOYMENT_TARGET=$ios_deployment_target",
+             "-s=IOS_PLATFORM_BUILD=$ios_platform_build",
+             "-s=IOS_PLATFORM_NAME=$ios_sdk_name",
+             "-s=IOS_PLATFORM_VERSION=$ios_sdk_version",
+             "-s=IOS_SDK_BUILD=$ios_sdk_build",
+             "-s=IOS_SDK_NAME=$ios_sdk_name$ios_sdk_version",
+             "-s=IOS_SUPPORTED_PLATFORM=$ios_sdk_platform",
+             "-s=PRODUCT_NAME=$_app_name",
+             "-s=XCODE_BUILD=$xcode_build",
+             "-s=XCODE_VERSION=$xcode_version",
+             "-o=" + rebase_path(outputs[0], root_build_dir),
+           ] + rebase_path(sources, root_build_dir)
+  }
 
-    _application_path = invoker.application_path
+  # Informs that the generated Info.plist file needs to be copied into the
+  # application bundle.
+  bundle_data(_bundle_data_info_plist) {
+    forward_variables_from(invoker, [ "testonly" ])
+    visibility = [ ":$_create_app_bundle" ]
+    sources = get_target_outputs(":$_generate_info_plist")
+    outputs = [
+      "{{bundle_root_dir}}/Info.plist",
+    ]
+    public_deps = [
+      ":$_generate_info_plist",
+    ]
+  }
 
-    script = ios_app_script
+  # Declare the name of some target as they have circular dependency via
+  # "visibility" and "deps".

[Dirk Pranke, 2016/03/01 23:56:30]

I would probably drop this comment as calling things a "circular dependency" may
just create confusion. Declaring variables that are used in multiple targets the
way you are is pretty common and I don't think it needs a comment.

[sdefresne, 2016/03/11 17:57:12]

Done.

+  _generate_executable = target_name + "_generate_executable"
+  _bundle_data_executable = target_name + "_bundle_data_executable"
 
+  # Generates the application executable.

[Dirk Pranke, 2016/03/01 23:56:30]

I would omit this comment.

[sdefresne, 2016/03/11 17:57:12]

Done.

+  executable(_generate_executable) {
+    visibility = [ ":$_bundle_data_executable" ]
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "app_name",
+                             "code_signing_identity",
+                             "data_deps",
+                             "entitlements_path",
+                             "info_plist",
+                             "visibility",
+                           ])
+
+    output_name = rebase_path("$target_gen_dir/$_app_name", root_build_dir)
+    if (!defined(libs)) {
+      libs = []
+    }
+    libs += [ "UIKit.framework" ]
+  }
+
+  # Informs that the application executable needs to be copied into the
+  # application bundle.

[Dirk Pranke, 2016/03/01 23:56:30]

I'm not actually sure what you're trying to convey with this comment, but I'd
probably leave it out.

[sdefresne, 2016/03/11 17:57:12]

Done.

+  bundle_data(_bundle_data_executable) {
+    forward_variables_from(invoker, [ "testonly" ])
+    visibility = [ ":$_create_app_bundle" ]
+    sources = [
+      "$target_gen_dir/$_app_name",
+    ]
     outputs = [
-      "$_application_path/_CodeSignature/CodeResources",
+      "{{bundle_executable_dir}}/$_app_name",
     ]
+    public_deps = [
+      ":$_generate_executable",
+    ]
+  }
 
-    args = [
-      "codesign",
-      "-p",
-      rebase_path(invoker.application_path, root_build_dir),
-      "-i",
-      invoker.identity,
-      "-e",
-      rebase_path(invoker.entitlements_path, root_build_dir),
-    ]
-
+  # Creates the application bundle.
+  create_bundle(_create_app_bundle) {

[Dirk Pranke, 2016/03/01 23:56:30]

Can you just make this be 

  create_bundle(target_name) {
    ...
 
handle the app_name inside, and get rid of the separate group() target?

[sdefresne, 2016/03/11 17:57:12]

Done, but now I get the following error:

$ ninja -C out/Default base_unittest.app
ninja: Entering directory `out/Default'
ninja: error: unknown target 'base_unittest.app'

I've added a comment to find a way to fix this.

     forward_variables_from(invoker,
                            [
+                             "data_deps",
                              "deps",
                              "public_deps",
                              "testonly",
+                             "visibility",
                            ])
+
+    if (!defined(deps)) {
+      deps = []
+    }
+    deps += [
+      ":$_bundle_data_executable",
+      ":$_bundle_data_info_plist",
+    ]
+
+    bundle_root_dir = "$root_out_dir/$_app_name.app"
+    bundle_resources_dir = bundle_root_dir
+    bundle_executable_dir = bundle_root_dir
+    bundle_plugins_dir = "$bundle_root_dir/Plugins"
   }
-}
 
-# TODO(GYP), TODO(dpranke): Should this be part of ios_app?
-template("resource_copy_ios") {
-  assert(defined(invoker.resources),
-         "The source list of resources to copy over")
-  assert(defined(invoker.bundle_directory),
-         "The directory within the bundle to place the sources in")
-  assert(defined(invoker.app_name), "The name of the application")
+  # TODO(crbug.com/297668):
+  # - add support for codesigning,
+  # - implements //testing/iossim(//build/toolchain/mac:clang_x64) and then

[Dirk Pranke, 2016/03/01 23:56:30]

Nit: s/implements/implement

[sdefresne, 2016/03/11 17:57:12]

Done.

+  #   add a depency to that target.
 
-  _bundle_directory = invoker.bundle_directory
-  _app_name = invoker.app_name
-  _resources = invoker.resources
-
-  copy(target_name) {
-    set_sources_assignment_filter([])
-    sources = _resources
-    outputs = [
-      "$root_build_dir/$_app_name.app/$_bundle_directory/{{source_file_part}}",
+  # This group target is there to alias the _create_app_bundle target using
+  # the name passed to the template.
+  group(target_name) {
+    forward_variables_from(invoker,
+                           [
+                             "testonly",
+                             "visibility",
+                           ])
+    deps = [
+      ":$_create_app_bundle",
     ]
   }
 }
-
-template("ios_app") {
-  assert(defined(invoker.deps),
-         "Dependencies must be specified for $target_name")
-  assert(defined(invoker.info_plist),
-         "The application plist file must be specified for $target_name")
-  assert(defined(invoker.entitlements_path),
-         "The entitlements path must be specified for $target_name")
-  assert(defined(invoker.code_signing_identity),
-         "The code_signing_identity must be specified for $target_name")
-
-  # We just create a variable so we can use the same in interpolation
-  if (defined(invoker.app_name)) {
-    _app_name = invoker.app_name
-  } else {
-    _app_name = target_name
-  }
-
-  forward_variables_from(invoker, [ "testonly" ])
-
-  plist_gen_target_name = target_name + "_plist"
-  bin_gen_target_name = target_name + "_bin"
-  group_target_name = target_name
-
-  # Generate the executable
-  executable(bin_gen_target_name) {
-    visibility = [ ":$group_target_name" ]
-
-    output_name = "${_app_name}.app/${_app_name}"
-
-    forward_variables_from(invoker,
-                           [
-                             "all_dependent_configs",
-                             "allow_circular_includes_from",
-                             "cflags",
-                             "cflags_c",
-                             "cflags_cc",
-                             "cflags_objc",
-                             "cflags_objcc",
-                             "configs",
-                             "check_includes",
-                             "data",
-                             "data_deps",
-                             "defines",
-                             "include_dirs",
-                             "ldflags",
-                             "public",
-                             "public_configs",
-                             "public_deps",
-                             "sources",
-                           ])
-
-    if (defined(invoker.libs)) {
-      libs = invoker.libs
-    } else {
-      libs = []
-    }
-    libs += [
-      "UIKit.framework",
-      "QuartzCore.framework",
-      "OpenGLES.framework",
-    ]
-
-    if (defined(invoker.deps)) {
-      deps = invoker.deps
-    } else {
-      deps = []
-    }
-    deps += [ ":$plist_gen_target_name" ]
-  }
-
-  # Process the Info.plist
-  action(plist_gen_target_name) {
-    visibility = [
-      ":$group_target_name",
-      ":$bin_gen_target_name",
-    ]
-
-    script = ios_app_script
-
-    sources = [
-      invoker.info_plist,
-    ]
-    outputs = [
-      "$root_build_dir/${_app_name}.app/Info.plist",
-    ]
-
-    args = [
-      "plist",
-      "-i",
-      rebase_path(invoker.info_plist, root_build_dir),
-      "-o",
-      rebase_path("$root_build_dir/${_app_name}.app"),
-    ]
-  }
-
-  # Perform Code Signing
-  entitlements_path = invoker.entitlements_path
-  if (invoker.code_signing_identity != "") {
-    code_sign_gen_target_name = target_name + "_codesign"
-    code_sign_ios(code_sign_gen_target_name) {
-      visibility = [ ":$target_name" ]
-
-      identity = invoker.code_signing_identity
-      application_path = "$root_build_dir/$app_name.app"
-      deps = [
-        ":$bin_gen_target_name",
-        ":$plist_gen_target_name",
-      ]
-    }
-  } else {
-    # This avoids a potential unused variable warning in the caller.
-    entitlements_path = entitlements_path
-  }
-
-  # Top level group
-  group(target_name) {
-    deps = [
-      ":$bin_gen_target_name",
-      ":$plist_gen_target_name",
-    ]
-    if (invoker.code_signing_identity != "") {
-      deps += [ ":$code_sign_gen_target_name" ]
-    }
-  }
-}