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Add FAQ for Alpine Linux #14

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Jan 19, 2022
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Add FAQ for Alpine Linux #14

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Add FAQ for Alpine Linux
philipgiuliani Oct 8, 2021
91dda27
Update README.md
philipgiuliani Oct 9, 2021
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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -138,6 +138,21 @@ alias for deployments, which will also use the `--style=compressed` option:
]
```

## FAQ
### Compatibility with Alpine Linux (`mix sass default` exited with 2)
Dart-native executables rely on [glibc](https://www.gnu.org/software/libc/) to be present. Because Alpine Linux uses [musl](https://musl.libc.org/) instead, you have to add the package [alpine-pkg-glibc](https://github.com/sgerrand/alpine-pkg-glibc) to your installation. Follow the installation guide in the README.

Example for Docker (has to be added before running `mix sass`):
```Dockerfile
RUN wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub
RUN wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.34-r0/glibc-2.34-r0.apk
RUN apk add glibc-2.34-r0.apk
```

In case you get the error `../../runtime/bin/eventhandler_linux.cc: 412: error: Failed to start event handler thread 1`, it means that your Docker installation or the used Docker-in-Docker image, is using a version below Docker 20.10.6. This error is related to an [updated version of the musl library](https://about.gitlab.com/blog/2021/08/26/its-time-to-upgrade-docker-engine). It can be resolved by using the [alpine-pkg-glibc](https://github.com/sgerrand/alpine-pkg-glibc) with the version 2.33 instead of 2.34.

Notes: The Alpine package gcompat vs libc6-compat will not work.

## Acknowledgements

This package is based on the excellent [esbuild](https://github.com/phoenixframework/esbuild) by Wojtek Mach and José Valim.
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