ios: add CrNet

ios/build/packaging/link_dependencies.py

Index: ios/build/packaging/link_dependencies.py
diff --git a/ios/build/packaging/link_dependencies.py b/ios/build/packaging/link_dependencies.py
new file mode 100755
index 0000000000000000000000000000000000000000..df541a63758a734f7fce000adb9a8ad7e4058369
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+++ b/ios/build/packaging/link_dependencies.py
@@ -0,0 +1,149 @@
+#!/usr/bin/env python
+#
+# 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.
+
+"""Links the deps of a binary into a static library.
+
+Run with a working directory, the name of a binary target, and the name of the
+static library that should be produced. For example:
+
+  $ link_dependencies.py out/Release-iphoneos \
+                         crnet_consumer.app/crnet_consumer \
+                         out/Release-iphoneos/crnet_standalone.a
+"""
+
+import argparse
+import os
+import subprocess
+
+
+class SubprocessError(Exception):
+  pass
+
+
+def extract_inputs(query_result, prefix=''):
+  """Extracts inputs from ninja query output.
+
+  Given 'ninja -t query' output for a target, extracts all the inputs of that
+  target, prefixing them with an optional prefix. Inputs prefixed with '|' are
+  implicit, so we discard them as they shouldn't be linked into the resulting
+  binary (these are things like the .ninja files themselves, dep lists, and so
+  on).
+
+  Example query result:
+    arch/crnet_consumer.armv7:
+      input: link
+        obj/[long path...]/crnet_consumer.crnet_consumer_app_delegate.armv7.o
+        obj/[long path...]/crnet_consumer.crnet_consumer_view_controller.armv7.o
+        obj/[long path...]/crnet_consumer.main.armv7.o
+        libcrnet.a
+        libdata_reduction_proxy_code_browser.a
+        ... many more inputs ...
+        liburl_util.a
+        | obj/content/content.actions_depends.stamp
+        | gen/components/data_reduction_proxy/common/version.h
+        | obj/ui/resources/ui_resources.actions_rules_copies.stamp
+        ... more implicit inputs ...
+    outputs:
+      crnet_consumer.app/crnet_consumer
+
+  Args:
+    query_result: output from 'ninja -t query'
+    prefix: optional file system path to prefix to returned inputs
+
+  Returns:
+    A list of the inputs.
+  """
+  extracting = False
+  inputs = []
+  for line in query_result.splitlines():
+    if line.startswith('  input:'):
+      extracting = True
+    elif line.startswith('  outputs:'):
+      extracting = False
+    elif extracting and '|' not in line:
+      inputs.append(os.path.join(prefix, line.strip()))
+  return inputs
+
+
+def query_ninja(target, workdir, prefix=''):
+  """Returns the inputs for the named target.
+
+  Queries ninja for the set of inputs of the named target, then returns the list
+  of inputs to that target.
+
+  Args:
+    target: ninja target name to query for
+    workdir: workdir for ninja
+    prefix: optional file system path to prefix to returned inputs
+
+  Returns:
+    A list of file system paths to the inputs to the named target.
+  """
+  proc = subprocess.Popen(['ninja', '-C', workdir, '-t', 'query', target],
+                          stdout=subprocess.PIPE)
+  stdout, _ = proc.communicate()
+  return extract_inputs(stdout, prefix)
+
+
+def is_library(target):
+  """Returns whether target is a library file."""
+  return os.path.splitext(target)[1] in ('.a', '.o')
+
+
+def library_deps(targets, workdir, query=query_ninja):
+  """Returns the set of library dependencies for the supplied targets.
+
+  The entries in the targets list can be either a static library, an object
+  file, or an executable. Static libraries and object files are incorporated
+  directly; executables are treated as being thin executable inputs to a fat
+  executable link step, and have their own library dependencies added in their
+  place.
+
+  Args:
+    targets: list of targets to include library dependencies from
+    workdir: working directory to run ninja queries in
+    query: function taking target, workdir, and prefix and returning an input
+           set
+  Returns:
+    Set of library dependencies.
+  """
+  deps = set()
+  for target in targets:
+    if is_library(target):
+      deps.add(os.path.join(workdir, target))
+    else:
+      deps = deps.union(query(target, workdir, workdir))
+  return deps
+
+
+def link(output, inputs):
+  """Links output from inputs using libtool.
+
+  Args:
+    output: file system path to desired output library
+    inputs: list of file system paths to input libraries
+  """
+  p = subprocess.Popen(['libtool', '-o', output] + inputs)
+  p.communicate()
+  if p.returncode != 0:
+    message = "subprocess libtool returned {0}".format(p.returncode)
+    raise SubprocessError(message)
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='Link dependencies of a ninja target into a static library')
+  parser.add_argument('workdir', nargs=1, help='ninja working directory')
+  parser.add_argument('target', nargs=1, help='target to query for deps')
+  parser.add_argument('output', nargs=1, help='path to output static library')
+  args = parser.parse_args()
+
+  inputs = query_ninja(args.target[0], args.workdir[0])
+  link(args.output[0], list(library_deps(inputs, args.workdir[0])))
+
+
+if __name__ == '__main__':
+  main()