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docs: explain provenance of default nix-path values

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this should make it more obvious how things are related to each other, and also
hopefully expose the historical context without having to say on every
corner that these details are accounting for legacy decisions.
This commit is contained in:
Valentin Gagarin 2024-09-05 04:18:02 +02:00
parent 668d63d8dd
commit 17655ecfef
1 changed files with 10 additions and 1 deletions
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11
src/libexpr/eval-settings.hh
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@ -87,10 +87,19 @@ struct EvalSettings : Config
If the respective paths are accessible, the default values are:
- `$HOME/.nix-defexpr/channels`
The [user channel link](@docroot@/command-ref/files/default-nix-expression.md#user-channel-link), pointing to the current state of [channels](@docroot@/command-ref/files/channels.md) for the current user.
- `nixpkgs=$NIX_STATE_DIR/profiles/per-user/root/channels/nixpkgs`
The current state of the `nixpkgs` channel for the `root` user.
- `$NIX_STATE_DIR/profiles/per-user/root/channels`
See [`NIX_STATE_DIR`](@docroot@/command-ref/env-common.md#env-NIX_STATE_DIR) for details.
The current state of all channels for the `root` user.
These files are set up by the [Nix installer](@docroot@/installation/installing-binary.md).
See [`NIX_STATE_DIR`](@docroot@/command-ref/env-common.md#env-NIX_STATE_DIR) for details on the environment variable.
> **Note**
>