[ios] Add support for filtering codesiging identity.

build/config/ios/ios_sdk.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.
 
 import("//build/toolchain/toolchain.gni")
 
 declare_args() {
   # SDK path to use. When empty this will use the default SDK based on the
   # value of use_ios_simulator.
   ios_sdk_path = ""
   ios_sdk_name = ""
   ios_sdk_version = ""
   ios_sdk_platform = ""
   ios_sdk_platform_path = ""
   xcode_version = ""
   xcode_build = ""
   machine_os_build = ""
 
   # Version of iOS that we're targeting.
   ios_deployment_target = "9.0"
 
   # The iOS Code signing identity to use
   # TODO(GYP), TODO(sdfresne): Consider having a separate
   # ios_enable_code_signing_flag=<bool> flag to make the invocation clearer.
   ios_enable_code_signing = true
   ios_code_signing_identity = ""
+  ios_code_signing_identity_description = "iPhone Developer"
 
   # Prefix for CFBundleIdentifier property of iOS bundles (correspond to the
   # "Organization Identifier" in Xcode). Code signing will fail if no mobile
   # provisioning for the selected code signing identify support that prefix.
   ios_app_bundle_id_prefix = "org.chromium"
 
   # If true, then allow using Xcode to automatically manage certificates. This
   # requires loading a separate Xcode project and enable automatically managed
   # certificates. When true, all test application will use the same bundle id
   # to avoid running out of certificates if using a free account.
@@ skipping 71 matching lines @@
   if (use_ios_simulator) {
     # This is weird, but Xcode sets DTPlatformBuild to an empty field for
     # simulator builds.
     ios_platform_build = ""
   } else {
     ios_platform_build = ios_sdk_build
   }
 }
 
 if (ios_enable_code_signing && !use_ios_simulator) {
-  find_signing_identity_args = []
+  find_signing_identity_args = [
+    "--identity-description",
+    ios_code_signing_identity_description,
+  ]
   if (!use_system_xcode) {
     find_signing_identity_args += [
       "--developer_dir",
       hermetic_xcode_path,
     ]
   }
 
   # If an identity is not provided, look for one on the host
   if (ios_code_signing_identity == "") {
     _ios_identities = exec_script("find_signing_identity.py",
                                   find_signing_identity_args,
                                   "list lines")
-    ios_code_signing_identity = _ios_identities[0]
-  }
+    if (_ios_identities == []) {
+      print("Tried to prepare a device build without specifying a code signing")
+      print("identity and could not detect one automatically either.")
+      print("TIP: Simulator builds don't require code signing...")

[justincohen, 2017/04/25 14:31:38]

I thought we codesign simulator builds now?

[sdefresne, 2017/04/25 14:34:53]

Simulator builds use "ad-hoc" code signing and do not require a valid
codesigning identity (confusing, isn't it?).

+      assert(false)
+    } else {
+      _ios_identities_len = 0
+      foreach(_, _ios_identities) {
+        _ios_identities_len += 1
+      }
 
-  if (ios_code_signing_identity == "") {
-    print("Tried to prepare a device build without specifying a code signing")
-    print("identity and could not detect one automatically either.")
-    print("TIP: Simulator builds don't require code signing...")
-    assert(false)
+      ios_code_signing_identity = _ios_identities[0]
+      if (_ios_identities_len != 1) {
+        print("Warning: Multiple codesigning identities match " +
+              "\"$ios_code_signing_identity_description\"")
+        foreach(_ios_identity, _ios_identities) {
+          _selected = ""
+          if (ios_code_signing_identity == _ios_identity) {
+            _selected = " (selected)"
+          }
+          print("Warning: - $_ios_identity$_selected")
+        }
+        print("Warning: Please use either ios_code_signing_identity or ")
+        print("Warning: ios_code_signing_identity_description variable to ")
+        print("Warning: control which identity is selected.")
+        print()
+      }
+    }
   }
 }