Commit 8cccf214 authored by michaeldo's avatar michaeldo Committed by Commit bot
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Move ios documentation from //docs to //docs/ios.

Cr-Commit-Position: refs/heads/master@{#454972}
parent 8bb8e0c0
......@@ -12,7 +12,7 @@ you might want to build:
* [Android](
* [Cast](
* [Chrome OS](
* [iOS](
* [iOS](ios/
* [Linux](
* [Mac](
* [Windows](
# Checking out and building Chromium for iOS
There are instructions for other platforms linked from the
[get the code](../ page.
## Instructions for Google Employees
Are you a Google employee? See
[go/building-chrome]( instead.
## System requirements
* A 64-bit Mac running 10.11+.
* [Xcode]( 8.0+.
* The OS X 10.10 SDK. Run
$ ls `xcode-select -p`/Platforms/MacOSX.platform/Developer/SDKs
to check whether you have it. Building with the 10.11 SDK works too, but
the releases currently use the 10.10 SDK.
* The current version of the JDK (required for the Closure compiler).
## Install `depot_tools`
Clone the `depot_tools` repository:
$ git clone
Add `depot_tools` to the end of your PATH (you will probably want to put this
in your `~/.bashrc` or `~/.zshrc`). Assuming you cloned `depot_tools` to
$ export PATH="$PATH:/path/to/depot_tools"
## Get the code
Create a `chromium` directory for the checkout and change to it (you can call
this whatever you like and put it wherever you like, as
long as the full path has no spaces):
$ mkdir chromium && cd chromium
Run the `fetch` tool from `depot_tools` to check out the code and its
$ fetch ios
If you don't want the full repo history, you can save a lot of time by
adding the `--no-history` flag to `fetch`.
Expect the command to take 30 minutes on even a fast connection, and many
hours on slower ones.
When `fetch` completes, it will have created a hidden `.gclient` file and a
directory called `src` in the working directory. The remaining instructions
assume you have switched to the `src` directory:
$ cd src
*Optional*: You can also [install API
keys]( if you want your
build to talk to some Google services, but this is not necessary for most
development and testing purposes.
## Setting up the build
Since the iOS build is a bit more complicated than a desktop build, we provide
`ios/build/tools/`, which will create four appropriately configured
build directories under `out` for Release and Debug device and simulator
builds, and generates an appropriate Xcode workspace as well.
This script is run automatically by fetch (as part of `gclient runhooks`).
You can customize the build by editing the file `$HOME/.setup-gn` (create it if
it does not exist). Look at `src/ios/build/tools/setup-gn.config` for
available configuration options.
From this point, you can either build from Xcode or from the command line using
`ninja`. `` creates sub-directories named
`out/${configuration}-${platform}`, so for a `Debug` build for simulator use:
$ ninja -C out/Debug-iphonesimulator gn_all
Note: you need to run `` script every time one of the ``
file is updated (either by you or after rebasing). If you forget to run it,
the list of targets and files in the Xcode solution may be stale.
You can also follow the manual instructions on the
[Mac page](../, but make sure you set the
GN arg `target_os="ios"`.
## Building for device
To be able to build and run Chromium and the tests for devices, you need to
have an Apple developer account (a free one will work) and the appropriate
provisioning profiles, then configure the build to use them.
### Code signing identity
Please refer to the Apple documentation on how to get a code signing identity
and certificates. You can check that you have a code signing identity correctly
installed by running the following command.
$ xcrun security find-identity -v -p codesigning
1) 0123456789ABCDEF0123456789ABCDEF01234567 "iPhone Developer: (XXXXXXXXXX)"
1 valid identities found
If the command output says you have zero valid identities, then you do not
have a code signing identity installed and need to get one from Apple. If
you have more than one identity, the build system may select the wrong one
automatically, and you can use the `ios_code_signing_identity` gn variable
to control which one to use by setting it to the identity hash, e.g. to
### Mobile provisioning profiles
Once you have the code signing identity, you need to decide on a prefix
for the application bundle identifier. This is controlled by the gn variable
`ios_app_bundle_id_prefix` and usually corresponds to a reversed domain name
(the default value is `"org.chromium"`).
You then need to request provisioning profiles from Apple for your devices
for the following bundle identifiers to build and run Chromium with these
application extensions:
- `${prefix}.chrome.ios.herebedragons`
- `${prefix}.chrome.ios.herebedragons.ShareExtension`
- `${prefix}.chrome.ios.herebedragons.TodayExtension`
All these certificates need to have the "App Groups"
(``) capability enabled for
the following groups:
- `group.${prefix}.chrome`
- `group.${prefix}.common`
The `group.${prefix}.chrome` is only shared by Chromium and its extensions
to share files and configurations while the `group.${prefix}.common` is shared
with Chromium and other applications from the same organisation and can be used
to send commands to Chromium.
### Mobile provisioning profiles for tests
In addition to that, you need provisioning profiles for the individual test
suites that you want to run. Their bundle identifier depends on whether the
gn variable `ios_automatically_manage_certs` is set to true (the default)
or false.
If set to true, then you just need a provisioning profile for the bundle
identifier `${prefix}.gtest.generic-unit-test` but you can only have a
single test application installed on the device (all the test application
will share the same bundle identifier).
If set to false, then you need a different provisioning profile for each
test application. Those provisioning profile will have a bundle identifier
matching the following pattern `${prefix}.gtest.${test-suite-name}` where
`${test-suite-name}` is the name of the test suite with underscores changed
to dashes (e.g. `base_unittests` app will use `${prefix}.gest.base-unittests`
as bundle identifier).
To be able to run the EarlGrey tests on a device, you'll need two provisioning
profiles for EarlGrey and OCHamcrest frameworks:
- `${prefix}.test.OCHamcrest`
- `${prefix}.test.EarlGrey`
In addition to that, then you'll need one additional provisioning profile for
the XCTest module too. This module bundle identifier depends on whether the
gn variable `ios_automatically_manage_certs` is set to true or false. If set
to true, then `${prefix}.test.gtest.generic-unit-test.generic-unit-test-module`
will be used, otherwise it will match the following pattern:
### Other applications
Other applications like `ios_web_shell` usually will require mobile provisioning
profiles with bundle identifiers that may usually match the following pattern
`${prefix}.${application-name}` and may require specific capabilities.
Generally, if the mobile provisioning profile is missing then the code signing
step will fail and will print the bundle identifier of the bundle that could not
be signed on the command line, e.g.:
$ ninja -C out/Debug-iphoneos ios_web_shell
ninja: Entering directory `out/Debug-iphoneos'
python ../../build/config/ios/ code-sign-bundle -t=iphoneos -i=0123456789ABCDEF0123456789ABCDEF01234567 -e=../../build/config/ios/entitlements.plist -b=obj/ios/web/shell/ios_web_shell
Error: no mobile provisioning profile found for "org.chromium.ios-web-shell".
ninja: build stopped: subcommand failed.
Here, the build is failing because there are no mobile provisioning profiles
installed that could sign the `` bundle with the identity
`0123456789ABCDEF0123456789ABCDEF01234567`. To fix the build, you'll need to
request such a mobile provisioning profile from Apple.
You can inspect the file passed via the `-e` flag to the `` script
to check which capabilites are required for the mobile provisioning profile
(e.g. `src/build/config/ios/entitlements.plist` for the above build error,
remember that the paths are relative to the build directory, not to the source
If the required capabilities are not enabled on the mobile provisioning profile,
then it will be impossible to install the application on a device (Xcode will
display an error stating that "The application was signed with invalid
## Running apps from the commandline
Any target that is built and runs on the bots (see [below](#Troubleshooting))
should run successfully in a local build. To run in the simulator from the
command line, you can use `iossim`. For example, to run a debug build of
$ out/Debug-iphonesimulator/iossim out/Debug-iphonesimulator/
## Update your checkout
To update an existing checkout, you can run
$ git rebase-update
$ gclient sync
The first command updates the primary Chromium source repository and rebases
any of your local branches on top of tip-of-tree (aka the Git branch
`origin/master`). If you don't want to use this script, you can also just use
`git pull` or other common Git commands to update the repo.
The second command syncs dependencies to the appropriate versions and re-runs
hooks as needed.
## Tips, tricks, and troubleshooting
If you have problems building, join us in `#chromium` on `` and
ask there. As mentioned above, be sure that the
[waterfall]( is green and the tree
is open before checking out. This will increase your chances of success.
### Improving performance of `git status`
`git status` is used frequently to determine the status of your checkout. Due
to the large number of files in Chromium's checkout, `git status` performance
can be quite variable. Increasing the system's vnode cache appears to help.
By default, this command:
$ sysctl -a | egrep kern\..*vnodes
Outputs `kern.maxvnodes: 263168` (263168 is 257 * 1024). To increase this
$ sudo sysctl kern.maxvnodes=$((512*1024))
Higher values may be appropriate if you routinely move between different
Chromium checkouts. This setting will reset on reboot, the startup setting can
be set in `/etc/sysctl.conf`:
$ echo kern.maxvnodes=$((512*1024)) | sudo tee -a /etc/sysctl.conf
Or edit the file directly.
If `git --version` reports 2.6 or higher, the following may also improve
performance of `git status`:
$ git update-index --untracked-cache
### Xcode license agreement
If you're getting the error
> Agreeing to the Xcode/iOS license requires admin privileges, please re-run as
> root via sudo.
the Xcode license hasn't been accepted yet which (contrary to the message) any
user can do by running:
$ xcodebuild -license
Only accepting for all users of the machine requires root:
$ sudo xcodebuild -license
# Continuous build and test infrastructure for Chromium for iOS
See the [instructions] for how to check out and build Chromium for iOS.
The Chromium projects use buildbot for continuous integration. This doc starts
with an overview of the system, then gives detailed explanations about each
## Overview
Commits are made using the [commit queue], which triggers a series of try jobs
to compile and test the proposed patch against Chromium tip of tree before
actually making the commit. If the try jobs succeed the patch is committed. A
newly committed change triggers the builders (or "bots") to compile and test
the change again.
## Bots
Bots are slaves attached to a buildbot master (or "waterfall"). A buildbot
master is a server which polls for commits to a repository and triggers workers
to compile and test new commits whenever they are detected. [chromium.mac] is
the main waterfall for Mac desktop and iOS. [tryserver.chromium.mac] serves
as the try server for Mac desktop and iOS.
The bots know how to check out a given revision of Chromium, compile, and test.
### Code location
#### Master configs
The masters are configured in [tools/build], a separate repository which
contains various infra-related scripts.
#### Pollers
[chromium.mac] uses a `GitilesPoller` which polls the Chromium repository for
new commits using the [gitiles] interface. When a new commit is detected, the
bots are triggered.
#### Recipes
The bots run [recipes], which are scripts that specify their sequence of steps
located in [tools/build]. An iOS-specific [recipe module] contains common
functionality that the various [iOS recipes] use.
#### Configs
Because the recipes live in another repository, changes to the recipes don't
go through the Chromium [commit queue] and aren't tested on the [try server].
In order to allow bot changes to be tested by the commit queue, the recipes
for iOS are generic instead of bot-specific, and rely on configuration files
which live in master-specific JSON config files located in [src/ios/build/bots].
These configs define the `gn_args` to use during compilation as well as the
tests to run.
#### Scripts
The [test runner] is the script which installs and runs the tests, interprets
the results, and collects any files emitted by the test ("test data"). It can
be found in [src/ios/build/bots/scripts], which means changes to the test runner
can be tested on the [try server].
### Compiling with goma
Goma is the distributed build system used by Chromium. It reduces compilation
time by avoiding recompilation of objects which have already been compiled
### Testing with swarming
Tests run on [swarming], a distributed test system used by Chromium. After
compilation, configured tests will be zipped up along with their necessary
dependencies ("isolated") and sent to the [swarming server] for execution. The
server issues tasks to its attached workers for execution. The bots themselves
don't run any tests, they trigger tests to be run remotely on the swarming
server, then wait and display the results. This allows multiple tests to be
executed in parallel.
## Try bots
Try bots are bots which test proposed patches which are not yet committed.
Request [try job access] in order to trigger try jobs against your patch. The
relevant try bots for an iOS patch are `ios-device`, `ios-device-xcode-clang`,
`ios-simulator`, and `ios-simulator-xcode-clang`. These bots can be found on
the Mac-specific [try server]. A try job is said to succeed when the build
passes (i.e. when the bot successfully compiles and tests the patch).
`ios-device` and `ios-device-xcode-clang` both compile for the iOS device
architecture (ARM), and neither run any tests. A build is considered successful
so long as compilation is successful.
`ios-simulator` and `ios-simulator-xcode-clang` both compile for the iOS
simulator architecture (x86), and run tests in the iOS [simulator]. A build is
considered successful when both compilation and all configured test succeed.
`ios-device` and `ios-simulator` both compile using the version of [clang]
defined by the `CLANG_REVISION` in the Chromium tree.
`ios-device-xcode-clang` and `ios-simulator-xcode-clang` both compile using the
version of clang that ships with Xcode.
### Scheduling try jobs using buildbucket
Triggering a try job and collecting its results is accomplished using
[buildbucket]. The service allows for build requests to be put into buckets. A
request in this context is a set of properties indicating things such as where
to get the patch. The try bots are set up to poll a particular bucket for build
requests which they execute and post the results of.
### Compiling with the analyzer
In addition to goma, the try bots use another time-saving mechanism called the
[analyzer] to determine the subset of compilation targets affected by the patch
that need to be compiled in order to run the affected tests. If a patch is
determined not to affect a certain test target, compilation and execution of the
test target will be skipped.
## Configuring the bots
See the [configs code location](#Configs) for where to find the config files for
the bots. The config files are JSON which describe how the bot should compile
and which tests it should run. The config files are located in the configs
directory. The configs directory contains a named directory for each master. For
$ ls ios/build/bots
OWNERS scripts tests chromium.mac
In this case, configs are defined for iOS bots on [] and
[chromium.mac]. Inside each master-specific directory are JSON config files
named after each bot. For example:
$ ls ios/build/bots/chromium.mac
ios-device.json ios-simulator.json
The `ios-device` bot on [chromium.mac] will read its configuration from
`chromium.mac/ios-device.json` in the configs directory.
### Example
"comments": [
"Sample config for a bot."
"gn_args": [
"tests": [
"app": "ios_chrome_unittests",
"device type": "iPhone 5s",
"os": "10.0",
"xcode version": "8.0"
The `comments` key is optional and defines a list of strings which can be used
to annotate the config. You may want to explain why the bot exists and what it's
doing, particularly if there are extensive and atypical `gn_args`.
The `gn_args` key is a required list of arguments to pass to [GN] to generate
the build files. Two GN args are required, `is_debug` and `target_cpu`. Use
`is_debug` to define whether to compile for Debug or Release, and `target_cpu`
to define whether to compile for x86, x64, arm, or arm64. The iOS bots typically
perform Debug builds for x86 and x64, and Release builds for arm and arm64. An
x86/x64 build can only be tested on the [iOS simulator], while an arm/arm64
build can only be tested on a physical device.
Since Chromium for iOS is shipped as a [universal binary], it's also fairly
common to set `additional_target_cpus`. For simulator builds, we typically set:
"gn_args": [
This builds universal binaries which run in 32-bit mode on 32-bit simulators and
64-bit mode on 64-bit simulators. For device builds we typically set:
"gn_args": [
In order to build universal binaries which run in 32-bit mode on 32-bit devices
and 64-bit mode on 64-bit devices.
The `tests` key is an optional list of dictionaries defining tests to run. There
are two types of test dictionary, `app` and `include`. An `app` dict defines a
specific compiled app to run, for example:
"tests": [
"app": "ios_chrome_unittests",
"device type": "iPhone 5s",
"os": "10.0",
"xcode version": "8.0"
This dict says to run `ios_chrome_unittests` on an `iPhone 5s` running iOS
`10.0` using Xcode `8.0`. A test dict may optionally define a list of `test
args`, which are arguments to pass directly to the test on the command line,
and it may define a boolean value `xctest` to indicate whether the test is an
[xctest] \(default if unspecified is `false`\). For example:
"tests": [
"app": "ios_chrome_unittests",
"device type": "iPhone 5s",
"os": "10.0",
"test args": [
"xcode version": "8.0"
"app": "ios_chrome_integration_egtests",
"device type": "iPhone 5s",
"os": "10.0",
"xcode version": "8.0",
"xctest": true
This defines two tests to run, first `ios_chrome_unittests` will be run with
`--foo` and `--bar` passed directly to the test on the command line. Next,
`ios_chrome_integration_egtests` will be run as an xctest. `"xctest": true`
must be specified for all xctests, it is an error to try and launch an xctest as
a regular test.
An `include` dict defines a list of tests to import from the `tests`
subdirectory in the configs directory. For example:
"tests": [
"include": "common_tests.json",
"device type": "iPhone 5s",
"os": "10.0",
"xcode version": "8.0"
This dict says to import the list of tests from the `tests` subdirectory and run
each one on an `iPhone 5s` running iOS `10.0` using Xcode `8.0`. Here's what
`common_tests.json` might look like:
"tests": [
"app": "ios_chrome_unittests"
"app": "ios_net_unittests"
"app": "ios_web_unittests"
Includes may contain other keys besides `app` which can then be omitted in the
bot config. For example if `common_tests.json` specifies:
"tests": [
"app": "ios_chrome_integration_egtests",
"xctest": true,
"xcode version": "8.0"
Then the bot config may omit the `xctest` or `xcode version` keys, for example:
"comments": [
"Sample config for a bot."
"gn_args": [
"tests": [
"include": "common_tests.json",
"device type": "iPhone 5s",
"os": "10.0"
Includes are not recursive, so `common_tests.json` may not itself include any
`include` dicts.
### Uploading compiled artifacts from a bot
A bot may be configured to upload compiled artifacts. This is defined by the
`upload` key. For example:
"comments": [
"Sample config for a bot which uploads artifacts."
"gn_args": [
"upload": [
"artifact": "Chromium.breakpad",
"bucket": "my-gcs-bucket",