Flakes: Difference between revisions

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'''Nix flakes''' is an [https://nixos.org/manual/nix/stable/contributing/experimental-~~features~~.html experimental feature] ~~of the Nix package manager. It enables the pinning and installation of packages not included in nixpkgs. Flakes~~ was introduced with Nix 2.4 ([https://nixos.org/manual/nix/unstable/release-notes/rl-2.4.html see release notes]).

'''Nix flakes''' is an [https://nixos.org/manual/nix/stable/contributing/experimental-Features.html experimental feature] that was introduced with Nix 2.4 ([https://nixos.org/manual/nix/unstable/release-notes/rl-2.4.html see release notes]).

====Introduction====

Nix flakes ~~provide~~ a ~~standard way to write~~ Nix ~~expressions (and therefore packages) whose~~ dependencies ~~are version-pinned~~ in a lock file, ~~improving reproducibility of~~ Nix installations. The experimental <code>nix</code> CLI lets you evaluate or build an expression contained within a flake, install a derivation from a flake into an [[User Environment]], and operate on flake outputs much like the original nix-{build,eval,...} commands would.

Nix flakes enforce a uniform structure for Nix projects, pin versions of their dependencies in a lock file, and make it more convenient to write reproducible Nix expressions.

* A [https://nixos.org/manual/nix/unstable/command-ref/new-cli/nix3-flake.html#description flake] refers to a file-system tree whose root directory contains the Nix file specification called <code>flake.nix</code>.

* An installation may contain any number of flakes, independent of each other or even call each other.

* The contents of <code>flake.nix</code> file follow a uniform naming schema for declaring packages and their dependencies in the Nix language.

* The contents of <code>flake.nix</code> file follow ~~the~~ uniform naming schema for ~~expressing~~ packages and dependencies on Nix.

* Flakes introduce a [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#flake-references URL-like syntax] for specifying remote sources.

* Flakes ~~use the standard Nix protocols, including the~~ [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#flake-references URL-like syntax] for specifying ~~repositories and package names~~.

* To simplify the long URL syntax with shorter names, [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-registry.html flakes uses a registry] of symbolic identifiers.

* Flakes also allow for locking references and versions that can then be ~~easily~~ queried and updated programmatically.

* Flakes also allow for locking references and versions that can then be queried and updated programmatically.

* [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix.html ~~Nix~~ command-line interface] accepts flake references for expressions that build, run, and deploy packages.

* An [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix.html experimental command-line interface] accepts flake references for expressions that build, run, and deploy packages.

====Enable flakes temporarily====

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-'''Nix flakes''' is an [https://nixos.org/manual/nix/stable/contributing/experimental-features.html experimental feature] of the Nix package manager. It enables the pinning and installation of packages not included in nixpkgs. Flakes was introduced with Nix 2.4 ([https://nixos.org/manual/nix/unstable/release-notes/rl-2.4.html see release notes]).
+'''Nix flakes''' is an [https://nixos.org/manual/nix/stable/contributing/experimental-Features.html experimental feature] that was introduced with Nix 2.4 ([https://nixos.org/manual/nix/unstable/release-notes/rl-2.4.html see release notes]).
 ====Introduction====
-Nix flakes provide a standard way to write Nix expressions (and therefore packages) whose dependencies are version-pinned in a lock file, improving reproducibility of Nix installations. The experimental <code>nix</code> CLI lets you evaluate or build an expression contained within a flake, install a derivation from a flake into an [[User Environment]], and operate on flake outputs much like the original nix-{build,eval,...} commands would.
+Nix flakes enforce a uniform structure for Nix projects, pin versions of their dependencies in a lock file, and make it more convenient to write reproducible Nix expressions.
 * A [https://nixos.org/manual/nix/unstable/command-ref/new-cli/nix3-flake.html#description flake] refers to a file-system tree whose root directory contains the Nix file specification called <code>flake.nix</code>.
-* An installation may contain any number of flakes, independent of each other or even call each other.
+* The contents of <code>flake.nix</code> file follow a uniform naming schema for declaring packages and their dependencies in the Nix language.
-* The contents of <code>flake.nix</code> file follow the uniform naming schema for expressing packages and dependencies on Nix.
+*  Flakes introduce a [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#flake-references URL-like syntax] for specifying remote sources.
-*  Flakes use the standard Nix protocols, including the [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-flake.html#flake-references URL-like syntax] for specifying repositories and package names.
 * To simplify the long URL syntax with shorter names, [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-registry.html flakes uses a registry] of symbolic identifiers.
-* Flakes also allow for locking references and versions that can then be easily queried and updated programmatically.
+* Flakes also allow for locking references and versions that can then be queried and updated programmatically.
-*  [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix.html Nix command-line interface] accepts flake references for expressions that build, run, and deploy packages.
+* An [https://nixos.org/manual/nix/stable/command-ref/new-cli/nix.html experimental command-line interface] accepts flake references for expressions that build, run, and deploy packages.
 ====Enable flakes temporarily====