forked from lix-project/lix
remove unnecessary indentation from markdown list
this makes it a bit easier to work with, as some tooling doesn't work well with too much indentation.
This commit is contained in:
Valentin Gagarin
parent
c29b8ba142
commit
0246de1896
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@ -2,109 +2,124 @@
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Most Nix commands interpret the following environment variables:
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- <span id="env-IN_NIX_SHELL">[`IN_NIX_SHELL`](#env-IN_NIX_SHELL)</span>\
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Indicator that tells if the current environment was set up by
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`nix-shell`. It can have the values `pure` or `impure`.
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- <span id="env-IN_NIX_SHELL">[`IN_NIX_SHELL`](#env-IN_NIX_SHELL)</span>
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- <span id="env-NIX_PATH">[`NIX_PATH`](#env-NIX_PATH)</span>\
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A colon-separated list of directories used to look up the location of Nix
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expressions using [paths](@docroot@/language/values.md#type-path)
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enclosed in angle brackets (i.e., `<path>`),
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e.g. `/home/eelco/Dev:/etc/nixos`. It can be extended using the
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[`-I` option](@docroot@/command-ref/opt-common.md#opt-I).
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Indicator that tells if the current environment was set up by
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`nix-shell`. It can have the values `pure` or `impure`.
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If `NIX_PATH` is not set at all, Nix will fall back to the following list in [impure](@docroot@/command-ref/conf-file.md#conf-pure-eval) and [unrestricted](@docroot@/command-ref/conf-file.md#conf-restrict-eval) evaluation mode:
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- <span id="env-NIX_PATH">[`NIX_PATH`](#env-NIX_PATH)</span>
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1. `$HOME/.nix-defexpr/channels`
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2. `nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixpkgs`
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3. `/nix/var/nix/profiles/per-user/root/channels`
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A colon-separated list of directories used to look up the location of Nix
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expressions using [paths](@docroot@/language/values.md#type-path)
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enclosed in angle brackets (i.e., `<path>`),
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e.g. `/home/eelco/Dev:/etc/nixos`. It can be extended using the
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[`-I` option](@docroot@/command-ref/opt-common.md#opt-I).
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If `NIX_PATH` is set to an empty string, resolving search paths will always fail.
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For example, attempting to use `<nixpkgs>` will produce:
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If `NIX_PATH` is not set at all, Nix will fall back to the following list in [impure](@docroot@/command-ref/conf-file.md#conf-pure-eval) and [unrestricted](@docroot@/command-ref/conf-file.md#conf-restrict-eval) evaluation mode:
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error: file 'nixpkgs' was not found in the Nix search path
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1. `$HOME/.nix-defexpr/channels`
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2. `nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixpkgs`
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3. `/nix/var/nix/profiles/per-user/root/channels`
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- <span id="env-NIX_IGNORE_SYMLINK_STORE">[`NIX_IGNORE_SYMLINK_STORE`](#env-NIX_IGNORE_SYMLINK_STORE)</span>\
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Normally, the Nix store directory (typically `/nix/store`) is not
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allowed to contain any symlink components. This is to prevent
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“impure” builds. Builders sometimes “canonicalise” paths by
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resolving all symlink components. Thus, builds on different machines
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(with `/nix/store` resolving to different locations) could yield
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different results. This is generally not a problem, except when
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builds are deployed to machines where `/nix/store` resolves
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differently. If you are sure that you’re not going to do that, you
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can set `NIX_IGNORE_SYMLINK_STORE` to `1`.
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If `NIX_PATH` is set to an empty string, resolving search paths will always fail.
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For example, attempting to use `<nixpkgs>` will produce:
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Note that if you’re symlinking the Nix store so that you can put it
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on another file system than the root file system, on Linux you’re
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better off using `bind` mount points, e.g.,
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error: file 'nixpkgs' was not found in the Nix search path
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```console
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$ mkdir /nix
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$ mount -o bind /mnt/otherdisk/nix /nix
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```
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- <span id="env-NIX_IGNORE_SYMLINK_STORE">[`NIX_IGNORE_SYMLINK_STORE`](#env-NIX_IGNORE_SYMLINK_STORE)</span>
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Consult the mount 8 manual page for details.
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Normally, the Nix store directory (typically `/nix/store`) is not
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allowed to contain any symlink components. This is to prevent
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“impure” builds. Builders sometimes “canonicalise” paths by
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resolving all symlink components. Thus, builds on different machines
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(with `/nix/store` resolving to different locations) could yield
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different results. This is generally not a problem, except when
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builds are deployed to machines where `/nix/store` resolves
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differently. If you are sure that you’re not going to do that, you
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can set `NIX_IGNORE_SYMLINK_STORE` to `1`.
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- <span id="env-NIX_STORE_DIR">[`NIX_STORE_DIR`](#env-NIX_STORE_DIR)</span>\
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Overrides the location of the Nix store (default `prefix/store`).
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Note that if you’re symlinking the Nix store so that you can put it
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on another file system than the root file system, on Linux you’re
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better off using `bind` mount points, e.g.,
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- <span id="env-NIX_DATA_DIR">[`NIX_DATA_DIR`](#env-NIX_DATA_DIR)</span>\
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Overrides the location of the Nix static data directory (default
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`prefix/share`).
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```console
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$ mkdir /nix
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$ mount -o bind /mnt/otherdisk/nix /nix
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```
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- <span id="env-NIX_LOG_DIR">[`NIX_LOG_DIR`](#env-NIX_LOG_DIR)</span>\
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Overrides the location of the Nix log directory (default
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`prefix/var/log/nix`).
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Consult the mount 8 manual page for details.
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- <span id="env-NIX_STATE_DIR">[`NIX_STATE_DIR`](#env-NIX_STATE_DIR)</span>\
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Overrides the location of the Nix state directory (default
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`prefix/var/nix`).
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- <span id="env-NIX_STORE_DIR">[`NIX_STORE_DIR`](#env-NIX_STORE_DIR)</span>
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- <span id="env-NIX_CONF_DIR">[`NIX_CONF_DIR`](#env-NIX_CONF_DIR)</span>\
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Overrides the location of the system Nix configuration directory
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(default `prefix/etc/nix`).
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Overrides the location of the Nix store (default `prefix/store`).
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- <span id="env-NIX_CONFIG">[`NIX_CONFIG`](#env-NIX_CONFIG)</span>\
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Applies settings from Nix configuration from the environment.
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The content is treated as if it was read from a Nix configuration file.
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Settings are separated by the newline character.
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- <span id="env-NIX_DATA_DIR">[`NIX_DATA_DIR`](#env-NIX_DATA_DIR)</span>
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- <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>\
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Overrides the location of the Nix user configuration files to load from.
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Overrides the location of the Nix static data directory (default
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`prefix/share`).
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The default are the locations according to the [XDG Base Directory Specification].
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See the [XDG Base Directories](#xdg-base-directories) sub-section for details.
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- <span id="env-NIX_LOG_DIR">[`NIX_LOG_DIR`](#env-NIX_LOG_DIR)</span>
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The variable is treated as a list separated by the `:` token.
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Overrides the location of the Nix log directory (default
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`prefix/var/log/nix`).
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- <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>\
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Use the specified directory to store temporary files. In particular,
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this includes temporary build directories; these can take up
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substantial amounts of disk space. The default is `/tmp`.
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- <span id="env-NIX_STATE_DIR">[`NIX_STATE_DIR`](#env-NIX_STATE_DIR)</span>
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- <span id="env-NIX_REMOTE">[`NIX_REMOTE`](#env-NIX_REMOTE)</span>\
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This variable should be set to `daemon` if you want to use the Nix
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daemon to execute Nix operations. This is necessary in [multi-user
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Nix installations](@docroot@/installation/multi-user.md). If the Nix
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daemon's Unix socket is at some non-standard path, this variable
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should be set to `unix://path/to/socket`. Otherwise, it should be
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left unset.
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Overrides the location of the Nix state directory (default
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`prefix/var/nix`).
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- <span id="env-NIX_SHOW_STATS">[`NIX_SHOW_STATS`](#env-NIX_SHOW_STATS)</span>\
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If set to `1`, Nix will print some evaluation statistics, such as
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the number of values allocated.
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- <span id="env-NIX_CONF_DIR">[`NIX_CONF_DIR`](#env-NIX_CONF_DIR)</span>
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- <span id="env-NIX_COUNT_CALLS">[`NIX_COUNT_CALLS`](#env-NIX_COUNT_CALLS)</span>\
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If set to `1`, Nix will print how often functions were called during
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Nix expression evaluation. This is useful for profiling your Nix
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expressions.
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Overrides the location of the system Nix configuration directory
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(default `prefix/etc/nix`).
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- <span id="env-GC_INITIAL_HEAP_SIZE">[`GC_INITIAL_HEAP_SIZE`](#env-GC_INITIAL_HEAP_SIZE)</span>\
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If Nix has been configured to use the Boehm garbage collector, this
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variable sets the initial size of the heap in bytes. It defaults to
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384 MiB. Setting it to a low value reduces memory consumption, but
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will increase runtime due to the overhead of garbage collection.
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- <span id="env-NIX_CONFIG">[`NIX_CONFIG`](#env-NIX_CONFIG)</span>
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Applies settings from Nix configuration from the environment.
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The content is treated as if it was read from a Nix configuration file.
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Settings are separated by the newline character.
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- <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>
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Overrides the location of the Nix user configuration files to load from.
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The default are the locations according to the [XDG Base Directory Specification].
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See the [XDG Base Directories](#xdg-base-directories) sub-section for details.
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The variable is treated as a list separated by the `:` token.
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- <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>
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Use the specified directory to store temporary files. In particular,
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this includes temporary build directories; these can take up
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substantial amounts of disk space. The default is `/tmp`.
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- <span id="env-NIX_REMOTE">[`NIX_REMOTE`](#env-NIX_REMOTE)</span>
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This variable should be set to `daemon` if you want to use the Nix
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daemon to execute Nix operations. This is necessary in [multi-user
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Nix installations](@docroot@/installation/multi-user.md). If the Nix
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daemon's Unix socket is at some non-standard path, this variable
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should be set to `unix://path/to/socket`. Otherwise, it should be
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left unset.
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- <span id="env-NIX_SHOW_STATS">[`NIX_SHOW_STATS`](#env-NIX_SHOW_STATS)</span>
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If set to `1`, Nix will print some evaluation statistics, such as
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the number of values allocated.
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- <span id="env-NIX_COUNT_CALLS">[`NIX_COUNT_CALLS`](#env-NIX_COUNT_CALLS)</span>
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If set to `1`, Nix will print how often functions were called during
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Nix expression evaluation. This is useful for profiling your Nix
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expressions.
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- <span id="env-GC_INITIAL_HEAP_SIZE">[`GC_INITIAL_HEAP_SIZE`](#env-GC_INITIAL_HEAP_SIZE)</span>
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If Nix has been configured to use the Boehm garbage collector, this
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variable sets the initial size of the heap in bytes. It defaults to
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384 MiB. Setting it to a low value reduces memory consumption, but
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will increase runtime due to the overhead of garbage collection.
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## XDG Base Directories
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