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doc/stdenv/stdenv.chapter.md: add information about nix-update-script and nixpkgs-update

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Nick Hu 2023-08-14 12:58:40 +01:00
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@ -425,6 +425,16 @@ A script to be run by `maintainers/scripts/update.nix` when the package is match
};
```
::: {.tip}
A common pattern is to use the [`nix-update-script`](https://github.com/NixOS/nixpkgs/blob/master/pkgs/common-updater/nix-update.nix) attribute provided in Nixpkgs, which runs [`nix-update`](https://github.com/Mic92/nix-update):
```nix
passthru.updateScript = nix-update-script { };
```
For simple packages, this is often enough, and will ensure that the package is updated automatically by [`nixpkgs-update`](https://ryantm.github.io/nixpkgs-update) when a new version is released. The [update bot](https://nix-community.org/update-bot) runs periodically to attempt to automatically update packages, and will run `passthru.updateScript` if set. While not strictly necessary if the project is listed on [Repology](https://repology.org), using `nix-update-script` allows the package to update via many more sources (e.g. GitHub releases).
:::
##### How update scripts are executed? {#var-passthru-updateScript-execution}
Update scripts are to be invoked by `maintainers/scripts/update.nix` script. You can run `nix-shell maintainers/scripts/update.nix` in the root of Nixpkgs repository for information on how to use it. `update.nix` offers several modes for selecting packages to update (e.g. select by attribute path, traverse Nixpkgs and filter by maintainer, etc.), and it will execute update scripts for all matched packages that have an `updateScript` attribute.