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54 lines
2 KiB
Markdown
54 lines
2 KiB
Markdown
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# Release 2.8 (2022-04-19)
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* New experimental command: `nix fmt`, which applies a formatter
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defined by the `formatter.<system>` flake output to the Nix
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expressions in a flake.
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* Various Nix commands can now read expressions from standard input
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using `--file -`.
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* New experimental builtin function `builtins.fetchClosure` that
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copies a closure from a binary cache at evaluation time and rewrites
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it to content-addressed form (if it isn't already). Like
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`builtins.storePath`, this allows importing pre-built store paths;
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the difference is that it doesn't require the user to configure
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binary caches and trusted public keys.
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This function is only available if you enable the experimental
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feature `fetch-closure`.
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* New experimental feature: *impure derivations*. These are
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derivations that can produce a different result every time they're
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built. Here is an example:
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```nix
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stdenv.mkDerivation {
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name = "impure";
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__impure = true; # marks this derivation as impure
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buildCommand = "date > $out";
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}
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```
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Running `nix build` twice on this expression will build the
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derivation twice, producing two different content-addressed store
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paths. Like fixed-output derivations, impure derivations have access
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to the network. Only fixed-output derivations and impure derivations
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can depend on an impure derivation.
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* `nix store make-content-addressable` has been renamed to `nix store
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make-content-addressed`.
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* The `nixosModule` flake output attribute has been renamed consistent
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with the `.default` renames in Nix 2.7.
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* `nixosModule` → `nixosModules.default`
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As before, the old output will continue to work, but `nix flake check` will
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issue a warning about it.
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* `nix run` is now stricter in what it accepts: members of the `apps`
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flake output are now required to be apps (as defined in [the
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manual](https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-run.html#apps)),
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and members of `packages` or `legacyPackages` must be derivations
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(not apps).
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