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Reword info on XDG base dirs (#8338)

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This gives some more context and should clarify why it works that way.
Also link it from the section on `NIX_USER_CONF_FILES`.

Co-authored-by: John Ericson <git@JohnEricson.me>
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Valentin Gagarin 2023-05-16 05:30:20 +02:00 committed by GitHub
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21
doc/manual/src/command-ref/env-common.md
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@ -71,9 +71,12 @@ Most Nix commands interpret the following environment variables:
Settings are separated by the newline character. Settings are separated by the newline character.
- <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>\ - <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>\
Overrides the location of the user Nix configuration files to load Overrides the location of the Nix user configuration files to load from.
from (defaults to the XDG spec locations). The variable is treated
as a list separated by the `:` token. The default are the locations according to the [XDG Base Directory Specification].
See the [XDG Base Directories](#xdg-base-directories) sub-section for details.
The variable is treated as a list separated by the `:` token.
- <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>\ - <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>\
Use the specified directory to store temporary files. In particular, Use the specified directory to store temporary files. In particular,
@ -103,15 +106,19 @@ Most Nix commands interpret the following environment variables:
384 MiB. Setting it to a low value reduces memory consumption, but 384 MiB. Setting it to a low value reduces memory consumption, but
will increase runtime due to the overhead of garbage collection. will increase runtime due to the overhead of garbage collection.
## XDG Base Directory ## XDG Base Directories
New Nix commands conform to the [XDG Base Directory Specification], and use the following environment variables to determine locations of various state and configuration files: Nix follows the [XDG Base Directory Specification].
For backwards compatibility, Nix commands will follow the standard only when [`use-xdg-base-directories`] is enabled.
[New Nix commands](@docroot@/command-ref/new-cli/nix.md) (experimental) conform to the standard by default.
The following environment variables are used to determine locations of various state and configuration files:
- [`XDG_CONFIG_HOME`]{#env-XDG_CONFIG_HOME} (default `~/.config`) - [`XDG_CONFIG_HOME`]{#env-XDG_CONFIG_HOME} (default `~/.config`)
- [`XDG_STATE_HOME`]{#env-XDG_STATE_HOME} (default `~/.local/state`) - [`XDG_STATE_HOME`]{#env-XDG_STATE_HOME} (default `~/.local/state`)
- [`XDG_CACHE_HOME`]{#env-XDG_CACHE_HOME} (default `~/.cache`) - [`XDG_CACHE_HOME`]{#env-XDG_CACHE_HOME} (default `~/.cache`)
Classic Nix commands can also be made to follow this standard using the [`use-xdg-base-directories`] configuration option.
[XDG Base Directory Specification]: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html [XDG Base Directory Specification]: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
[`use-xdg-base-directories`]: @docroot@/command-ref/conf-file.md#conf-use-xdg-base-directories [`use-xdg-base-directories`]: @docroot@/command-ref/conf-file.md#conf-use-xdg-base-directories