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build: document electron goma usage and add the external binaries (#2…

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MarshallOfSound committed Jan 7, 2020
1 parent 0a850fb commit e18acb4380ef8a7e299a0a6eea548cb39062318a
Showing with 85 additions and 2 deletions.
  1. +2 −0 build/args/
  2. +61 −0 docs/development/
  3. +15 −0 script/external-binaries.json
  4. +7 −2 script/
@@ -0,0 +1,2 @@
goma_dir = rebase_path("//electron/external_binaries/goma")
use_goma = true
@@ -0,0 +1,61 @@
# Goma

> Goma is a distributed compiler service for open-source projects such as
> Chromium and Android.
Electron has a deployment of a custom Goma Backend that we make available to
all Electron Maintainers. See the [Access](#access) section below for details
on authentication.

## Enabling Goma

Currently Electron Goma supports both Windows and Linux, we may add macOS
support at some point in the future. If you are on a supported platform
you can enable goma by importing the `` config file when using `gn`.

gn gen out/Testing --args="import(\"//electron/build/args/\") import(\"//electron/build/args/\")"

You must ensure that you do not have `cc_wrapper` configured, this means you
can't use `sccache` or similar technology.

Before you can use goma to build Electron you need to authenticate against
the Goma service. You only need to do this once per-machine.

cd electron/external_binaries/goma login

Once authenticated you need to make sure the goma daemon is running on your

cd electron/external_binaries/goma ensure_start

## Building with Goma

When you are using Goma you can run `ninja` with a substantially higher `j`
value than would normally be supported by your machine. Please do not set
a value higher than **300**, we monitor the goma system and users found to
be abusing it with unreasonable concurrency will be de-activated.

ninja -C out/Testing electron -j 200

## Monitoring Goma

If you access [http://localhost:8088](http://localhost:8088) on your local
machine you can monitor compile jobs as they flow through the goma system.

## Access

For security and cost reasons access to Electron Goma is currently restricted
to Electron Maintainers. If you want access please head to `#access-requests` in
Slack and ping `@goma-squad` to ask for access. Please be aware that being a
maintainer does not *automatically* grant access and access is determined on a
case by case basis.
@@ -43,6 +43,21 @@
"url": "",
"platform": "win32",
"sha": "b6a20fd1c2026f3792e7286bc768a7ebc261847b76449b49f55455e1f841fecd"
"url": "",
"platform": "win32",
"sha": "f97c88aa5d49395ae20387b6329ad406fd019f5fb4aac4ba639ca928b7151f6b"
"url": "goma-linux.tgz",
"platform": "linux",
"sha": "1cb3099a40f6200ae57216efa26af795c587b6ac7ae97955d1078d0b1e3011a6"
"url": "goma-mac.tgz",
"platform": "darwin",
"sha": "da1e7de82fbf3b99f1a9d0f9bf51b25e75e8778fec180deb72cff873813d717c"
@@ -5,6 +5,7 @@
import hashlib
import json
import os
import tarfile

from lib.config import PLATFORM, get_target_arch
from lib.util import add_exec_bit, download, extract_zip, rm_rf, \
@@ -51,8 +52,12 @@ def main():

temp_path = download_binary(base_url, version, binary['url'], binary['sha'])

# We assume that all binaries are in zip archives.
extract_zip(temp_path, output_dir)
if temp_path.endswith('.zip'):
extract_zip(temp_path, output_dir)
tar =, "r:gz")

# Hack alert. Set exec bit for sccache binaries.

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