Currently, on iOS Firestore is loading `roots.pem` file from the gRPC bundle. The mechanism has proved to be brittle, so instead we can use the same approach as the CMake build does -- parse the file at build time and embed its contents into the binary.
One downside of this approach is that now we would have to periodically update the generated files for embedding manually. Judging from history, `roots.pem` is updated quite often in gRPC repo, and can be expected to be modified on each release.
The command to regenerate the certificates is something like:
```sh
mkdir build # From the root of the repo
cd build
cmake .. && make -j 8 generate_grpc_root_certificates
```
TESTED=with Fireeats.
* Rewrite lint.sh as check_lint.py
This makes several beneficial changes:
* Runs in parallel: lint all now takes 5.5 seconds, down from 25.
* Supports linting specific files, passed on the command-line.
* Defaults to linting files changed since master, pass --all to lint
everything.
* Infers header language based on related files.
* Lays the groundwork for linting more than just C++.
* Adds support for linting python.
* Fix lint errors
* Use check_lint.py in check.sh
* Remove lint.sh
* Python lint configuration
* Enable python linting in travis
Konstantin Varlamov