Add Linux build packaging targets to GN

chrome/version.gni

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 
 # Runs the version processing script over the given template file to produce
 # an output file. This is used for generating various forms of files that
 # incorporate the product name and version.
 #
 # Unlike GYP, this will actually compile the resulting file, so you don't need
 # to add it separately to the sources, just depend on the target.
 #
 # This template automatically includes VERSION, LASTCHANGE, and BRANDING. It
 # automatically uses the template file .
 # GYP parameterizes this template file but all current invocations use this
 # same one. If in the future we need to set it, this should be added as an
 # optional argument.
 #
 # In GYP this is a rule that runs once per ".ver" file. In GN this just
 # processes one file per invocation of the template so you may have to have
 # multiple targets.
 #
-# You must specify either sources or a template_file, or both.
-#
 # Parameters:
 #   sources (optional):
 #     List of file names to read. When converting a GYP target, this should
 #     list the 'source' (see above) as well as any extra_variable_files.
 #
 #   output:
 #     File name of file to write. In GYP this is unspecified and it will
 #     make up a file name for you based on the input name, and tack on
 #     "_version.rc" to the end. But in GN you need to specify the full name.
 #
 #   template_file (optional):
-#     Template file to use (not a list). Defaults to
-#     //chrome/app/chrome_version.rc.version if unspecified.
-#     TODO(brettw) remove this default behavior and specify it every time.
+#     Template file to use (not a list). Most Windows uses for generating
+#     resources will want to specify the chrome_version_rc_template defined
+#     below.
 #
 #   extra_args (optional):
 #     Extra arguments to pass to version.py. Any "-f <filename>" args should
 #     use sources instead.
 #
 #   process_only (optional, defaults to false)
 #     Set to generate only one action that processes the version file and
 #     doesn't attempt to link the result into a source set. This is for if
 #     you are processing the version as data only.
 #
 #   visibility (optional)
 #
 # Example:
 #   process_version("myversion") {
 #     sources = [ "myfile.h.in" ]
 #     output = "$target_gen_dir/myfile.h"
 #     extra_args = ["-e", "FOO=42"]
 #     extra_files = [ "foo/BRANDING" ]
 #   }
 template("process_version") {
-  assert(defined(invoker.sources) || defined(invoker.template_file),
-         "Either sources or template_file must be defined for $target_name")
   assert(defined(invoker.output), "Output must be defined for $target_name")
 
   process_only = defined(invoker.process_only) && invoker.process_only
 
   if (process_only) {
     action_name = target_name
   } else {
     action_name = target_name + "_action"
     source_set_name = target_name
   }
 
   action(action_name) {
     script = "//build/util/version.py"
 
     lastchange_path = "//build/util/LASTCHANGE"
     version_path = "//chrome/VERSION"
     if (is_chrome_branded) {
       branding_path = "//chrome/app/theme/google_chrome/BRANDING"
     } else {
       branding_path = "//chrome/app/theme/chromium/BRANDING"
     }
-    if (defined(invoker.template_file)) {
-      template_path = invoker.template_file
-    } else {
-      template_path = "//chrome/app/chrome_version.rc.version"
-    }
 
     inputs = [
       version_path,
       lastchange_path,
       branding_path,
-      template_path,
     ]
+    if (defined(invoker.template_file)) {
+      inputs += [ invoker.template_file ]
+    }
 
     outputs = [
       invoker.output,
     ]
 
     args = []
 
     if (defined(invoker.sources)) {
       inputs += invoker.sources
       foreach(i, invoker.sources) {
         args += [
           "-f",
           rebase_path(i, root_build_dir),
         ]
       }
     }
 
     args += [
       "-f",
       rebase_path(version_path, root_build_dir),
       "-f",
       rebase_path(branding_path, root_build_dir),
       "-f",
       rebase_path(lastchange_path, root_build_dir),
     ]
     if (defined(invoker.extra_args)) {
       args += invoker.extra_args
     }
     args += [
-      rebase_path(template_path, root_build_dir),
+      "-o",
       rebase_path(invoker.output, root_build_dir),
     ]
+    if (defined(invoker.template_file)) {
+      args += [ rebase_path(invoker.template_file, root_build_dir) ]
+    }
 
     if (process_only) {
       # When processing only, visibility gets applied to this target.
       forward_variables_from(invoker, [ "visibility" ])
     } else {
       # When linking the result, only the source set can depend on the action.
       visibility = [ ":$source_set_name" ]
     }
   }
 
   if (!process_only) {
     source_set(source_set_name) {
       forward_variables_from(invoker, [ "visibility" ])
       sources = get_target_outputs(":$action_name")
       public_deps = [
         ":$action_name",
       ]
     }
   }
 }
+
+chrome_version_rc_template = "//chrome/app/chrome_version.rc.version"