playwright/browser_patches/README.md
2020-02-04 08:01:25 -08:00

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# Contributing Browser Patches
Firefox and WebKit have additional patches atop to expose necessary capabilities.
Ideally, all these changes should be upstreamed.
For the time being, it is possible to setup a browser checkout
and develop from there.
## 1. Setting up local browser checkout
From the `playwright` repo, run the following command:
```sh
$ ./browser_patches/prepare_checkout.sh firefox <path to checkout>
```
(you can optionally pass "webkit" for a webkit checkout)
If you don't have a checkout, don't pass a path and one will be created for you in `./browser_patches/firefox/checkout`
> **NOTE:** this command downloads GBs of data.
This command will:
- create a `browser_upstream` remote in the checkout
- create a `playwright-build` branch and apply all playwright-required patches to it.
## 2. Developing a new change
You want to create a new branch off the `playwright-build` branch.
Assuming that you're under `./browser_patches/firefox/checkout`:
```sh
$ git checkout -b my-new-feature playwright-build
$ # develop my feature on the my-new-feature branch ....
```
## 3. Exporting your change to playwright repo
Once you're happy with the work you did in the browser-land, you want to export it to the `playwright` repo.
Assuming that you're in the root of the `playwright` repo and that your browser checkout has your feature branch checked out:
```sh
$ ./browser_patches/export.sh firefox <path to checkout>
```
This script will:
- create a new patch and put it to the `./browser_patches/firefox/patches/`
- update the `./browser_patches/firefox/UPSTREAM_CONFIG.sh` if necessary
- bump the `./browser_patches/firefox/BUILD_NUMBER` number.
If you omit the path to your checkout, the script will assume one is located at `./browser_patches/firefox/checkout`
Send a PR to the Playwright repo to be reviewed.
## 4. Rolling Playwright to the new browser build
Once the patch has been committed, the build bots will kick in, compile and upload a new browser version to all the platforms.
You can check the CDN status:
```sh
$ ./browser_patches/tools/check_cdn.sh
```
As the builds appear, you can roll to a new browser version in the `./package.json` file.