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# Updating glean_parser
Project FOG uses the `glean_parser` to generate code from metric definitions.
It depends on [glean-parser] from pypi.org
[glean-parser]: https://pypi.org/project/glean-parser/
To update the in-tree glean-parser change the version in `third_party/python/requirements.in`,
then run
```
./mach vendor python
```
```{note}
**Important**: the glean_parser and all of its dependencies must support Python 3.5, as discussed here.
This is the minimum version supported by mach and installed on the CI images for running tests.
This is enforced by the version ranges declared in the Python installation manifest.
```
## Version mismatch of the Python dependencies
The logic for handling version mismatches is very similar to the one for the Rust crates.
See [Updating the Glean SDK](updating_sdk.md) for details.
However, updating Python packages also requires to think about Python 3.5 (and Python 2, still) compatibility.
## Keeping versions in sync
The Glean SDK and `glean_parser` are currently released as separate projects.
However each Glean SDK release requires a specific `glean_parser` version.
When updating one or the other ensure versions stay compatible.
You can find the currently used `glean_parser` version in the Glean SDK source tree, e.g. in [sdk_generator.sh].
[sdk_generator.sh]: https://github.com/mozilla/glean/blob/main/glean-core/ios/sdk_generator.sh#L28
## Using a local `glean_parser` development version
To test out a new `glean_parser` in mozilla-central follow these steps:
1. Remove `glean_parser` from the user-wide virtual environment.
This can be found in a path like `~/.mozbuild/srcdirs/gecko-f5e3b9c6ded5/_virtualenvs/mach/lib/python3.10/site-packages/glean_parser`
Note that the `gecko-f5e3b9c6ded5` part will be different depending on your local checkout.
Remove all directories and files mentioning `glean_parser`
2. Remove `glean_parser` from the build virtual enviromment.
This can be found in `$MOZ_OBJDIR/_virtualenvs/common/lib/python3.6/site-packages/glean_parser`.
Note that `$MOZ_OBJDIR` depends on your local mozconfig configuration.
Remove all directories and files mentioning `glean_parser`
3. Copy the local `glean_parser` checkout into `third_party/python/glean_parser`.
E.g. `cp ~/code/glean_parser $GECKO/third_party/python/glean_parser`.
You should now be able to build `mozilla-central` and it will use the modified `glean_parser`.
You can make further edits in `$GECKO/third_party/python/glean_parser`.
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