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# libchromiumcontent
# ⚠️⚠️⚠️ DEPRECATED ⚠️⚠️⚠️
Automatically builds and provides prebuilt binaries of the [Chromium Content
module](http://www.chromium.org/developers/content-module) and all its
dependencies (e.g., Blink, V8, etc.).
As of Electron 4.0.0, libchromiumcontent is no longer built separately from Electron.
## Development
See [Updated Electron build instructions](https://github.com/electron/electron/blob/master/docs/development/build-instructions-gn.md).
### Prerequisites
### Older versions
* [Linux](https://chromium.googlesource.com/chromium/src/+/master/docs/linux_build_instructions.md)
* [Mac](https://chromium.googlesource.com/chromium/src/+/master/docs/mac_build_instructions.md#Prerequisites)
* [Windows](https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md)
If you're trying to build a pre-4.0.0 version of Electron, look at one of the old branches in this repo:
Note: Even though it is not mentioned in chromium documentation, pywin32 must
also be installed for `gclient` to work properly. Before invoking script/update,
download/install the x64 version from: https://sourceforge.net/projects/pywin32/
### One-time setup
$ script/bootstrap
### Building
$ script/update -t x64
$ script/build -t x64
### Updating project files
If you switch to a different Chromium release, or modify
files inside the `chromiumcontent` directory, you should run:
$ script/update
This will regenerate all the project files. Then you can build again.
### Building for ARM target
> TODO: This section may be out of date, needs review
```bash
$ ./script/bootstrap
$ ./script/update -t arm
$ cd vendor/chromium/src
$ ./build/install-build-deps.sh --arm
$ ./chrome/installer/linux/sysroot_scripts/install-debian.wheezy.sysroot.py --arch=arm
$ cd -
$ ./script/build -t arm
```
### Building for ARM64 target
```bash
$ ./script/bootstrap
$ ./script/update -t arm64
$ ./script/build -t arm64
$ ./script/create-dist -t arm64
```
### Adding a Patch
The Chromium checkout consists of several repos. Chromium itself is in the `src`
directory, and its dependencies are in subdirectories of `src`, mostly in
`src/third_party/*`.
Files in the top level of the `patches` directory only contain patches for
the files in `src` that belong to the Chromium repo itself. Subdirectories like
`patches/v8` or `patches/third_party/skia` contain patches for the corresponding
subdirectories in `src` (`src/v8` and
`src/third_party/skia` respectively), which are independent repos.
If you need to make changes in two different repos, you must create two patch
files. Giving those patch files the same name is a good idea.
Get Chromium in `src/` and apply existing patches to it. No need to do this
again if it has already been done:
```sh
./script/update
```
Change to the `src` directory:
```sh
cd src
```
Stage existing changes to make `git diff` useful:
```sh
git add .
```
Make any code changes you like.
When you're done, pipe the diff into a patch file. The file should be prefixed
with a number with leading zeros that is greater than any existing patch index,
e.g. `0052` if the last patch in the folder is named `0051-some-other.patch`:
```
git diff > patches/0052-meaningful-name.patch
```
## Releases
There is no formal release process for libchromiumcontent, as release artifacts
are created as a byproduct of CI. When a build is successful, its compiled
asset is automatically uploaded to S3. These assets are later downloaded as
part of Electron's bootstrap script. These files are about 4GB, so the
bootstrap task takes a while to run.
Asset URLs have the following format:
```js
`https://s3.amazonaws.com/github-janky-artifacts/libchromiumcontent/${platform}/${commit}/libchromiumcontent.zip`
```
Builds exist for the following platform/arch pairs:
- `linux/arm`
- `linux/ia32`
- `linux/x64`
- `mas/x64` (though `osx/mas` would be a more accurate name)
- `osx/x64`
- `win/ia32`
- `win/x64`
The Linux machines only build for pushes by GitHub employees, so PRs
from third parties have to have their linux builds triggered manually.
Each platform/arch has its own CI task, so it should be made sure that all
platform/arch have the CI tasks started and finished. To verify that
a given commit has all the necessary build artifacts:
```
npm i -g electron/libcc-check
libcc-check 7a9d4a1c9c265468dd54005f6c1920b2cc2c8ec3
```
## Setting libchromiumcontent version in Electron
For Electron versions 1.7 and higher, libchromiumcontent is vendored as a git
submodule in the Electron repo. To change the version that Electron is using,
use git to check out the target branch / SHA:
```
cd electron/electron/vendor/libchromiumcontent
git checkout some-branch-or-sha
```
For Electron versions 1.6 and lower, libchromiumcontent is vendored as part
of a (now retired) project called brightray. To change the version that
Electron is using, change the commit SHA in [config.py](https://github.com/electron/electron/blob/0428632a4e5dfa65e7ffbe39ff208069f0b9cdc4/script/lib/config.py#L12).
- [electron-3-0-x](https://github.com/electron/libchromiumcontent/tree/electron-3-0-x)
- [electron-2-0-x](https://github.com/electron/libchromiumcontent/tree/electron-2-0-x)
- [electron-1-8-x](https://github.com/electron/libchromiumcontent/tree/electron-1-8-x)