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34 lines
1.3 KiB
Markdown
34 lines
1.3 KiB
Markdown
# Release X.Y (202?-??-??)
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* Various nix commands can now read expressions from stdin with `--file -`.
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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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* 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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