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This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
77 lines
3.1 KiB
Markdown
77 lines
3.1 KiB
Markdown
# Name
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`nix.conf` - Nix configuration file
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# Description
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Nix supports a variety of configuration settings, which are read from configuration files or taken as command line flags.
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## Configuration file
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By default Nix reads settings from the following places, in that order:
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1. The system-wide configuration file `sysconfdir/nix/nix.conf` (i.e. `/etc/nix/nix.conf` on most systems), or `$NIX_CONF_DIR/nix.conf` if [`NIX_CONF_DIR`](./env-common.md#env-NIX_CONF_DIR) is set.
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Values loaded in this file are not forwarded to the Nix daemon.
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The client assumes that the daemon has already loaded them.
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1. If [`NIX_USER_CONF_FILES`](./env-common.md#env-NIX_USER_CONF_FILES) is set, then each path separated by `:` will be loaded in reverse order.
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Otherwise it will look for `nix/nix.conf` files in `XDG_CONFIG_DIRS` and [`XDG_CONFIG_HOME`](./env-common.md#env-XDG_CONFIG_HOME).
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If unset, `XDG_CONFIG_DIRS` defaults to `/etc/xdg`, and `XDG_CONFIG_HOME` defaults to `$HOME/.config` as per [XDG Base Directory Specification](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html).
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1. If [`NIX_CONFIG`](./env-common.md#env-NIX_CONFIG) is set, its contents are treated as the contents of a configuration file.
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### File format
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Configuration files consist of `name = value` pairs, one per line.
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Comments start with a `#` character.
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Example:
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```
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keep-outputs = true # Nice for developers
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keep-derivations = true # Idem
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```
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Other files can be included with a line like `include <path>`, where `<path>` is interpreted relative to the current configuration file.
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A missing file is an error unless `!include` is used instead.
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A configuration setting usually overrides any previous value.
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However, for settings that take a list of items, you can prefix the name of the setting by `extra-` to *append* to the previous value.
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For instance,
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```
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substituters = a b
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extra-substituters = c d
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```
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defines the `substituters` setting to be `a b c d`.
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Unknown option names are not an error, and are simply ignored with a warning.
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## Command line flags
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Configuration options can be set on the command line, overriding the values set in the [configuration file](#configuration-file):
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- Every configuration setting has corresponding command line flag (e.g. `--max-jobs 16`).
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Boolean settings do not need an argument, and can be explicitly disabled with the `no-` prefix (e.g. `--keep-failed` and `--no-keep-failed`).
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Unknown option names are invalid flags (unless there is already a flag with that name), and are rejected with an error.
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- The flag `--option <name> <value>` is interpreted exactly like a `<name> = <value>` in a setting file.
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Unknown option names are ignored with a warning.
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The `extra-` prefix is supported for settings that take a list of items (e.g. `--extra-trusted users alice` or `--option extra-trusted-users alice`).
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## Integer settings
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Settings that have an integer type support the suffixes `K`, `M`, `G`
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and `T`. These cause the specified value to be multiplied by 2^10,
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2^20, 2^30 and 2^40, respectively. For instance, `--min-free 1M` is
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equivalent to `--min-free 1048576`.
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# Available settings
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