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83 lines
3.2 KiB
Markdown
83 lines
3.2 KiB
Markdown
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# Release 2.2 (2019-01-11)
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This is primarily a bug fix release. It also has the following changes:
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- In derivations that use structured attributes (i.e. that specify set
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the `__structuredAttrs` attribute to `true` to cause all attributes
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to be passed to the builder in JSON format), you can now specify
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closure checks per output, e.g.:
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outputChecks."out" = {
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# The closure of 'out' must not be larger than 256 MiB.
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maxClosureSize = 256 * 1024 * 1024;
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# It must not refer to C compiler or to the 'dev' output.
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disallowedRequisites = [ stdenv.cc "dev" ];
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};
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outputChecks."dev" = {
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# The 'dev' output must not be larger than 128 KiB.
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maxSize = 128 * 1024;
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};
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- The derivation attribute `requiredSystemFeatures` is now enforced
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for local builds, and not just to route builds to remote builders.
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The supported features of a machine can be specified through the
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configuration setting `system-features`.
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By default, `system-features` includes `kvm` if `/dev/kvm` exists.
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For compatibility, it also includes the pseudo-features
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`nixos-test`, `benchmark` and `big-parallel` which are used by
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Nixpkgs to route builds to particular Hydra build machines.
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- Sandbox builds are now enabled by default on Linux.
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- The new command `nix doctor` shows potential issues with your Nix
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installation.
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- The `fetchGit` builtin function now uses a caching scheme that puts
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different remote repositories in distinct local repositories, rather
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than a single shared repository. This may require more disk space
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but is faster.
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- The `dirOf` builtin function now works on relative paths.
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- Nix now supports [SRI hashes](https://www.w3.org/TR/SRI/), allowing
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the hash algorithm and hash to be specified in a single string. For
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example, you can write:
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import <nix/fetchurl.nix> {
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url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
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hash = "sha256-XSLa0FjVyADWWhFfkZ2iKTjFDda6mMXjoYMXLRSYQKQ=";
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};
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instead of
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import <nix/fetchurl.nix> {
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url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
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sha256 = "5d22dad058d5c800d65a115f919da22938c50dd6ba98c5e3a183172d149840a4";
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};
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In fixed-output derivations, the `outputHashAlgo` attribute is no
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longer mandatory if `outputHash` specifies the hash.
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`nix hash-file` and `nix
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hash-path` now print hashes in SRI format by default. They also use
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SHA-256 by default instead of SHA-512 because that's what we use
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most of the time in Nixpkgs.
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- Integers are now 64 bits on all platforms.
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- The evaluator now prints profiling statistics (enabled via the
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NIX\_SHOW\_STATS and NIX\_COUNT\_CALLS environment variables) in
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JSON format.
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- The option `--xml` in `nix-store
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--query` has been removed. Instead, there now is an option
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`--graphml` to output the dependency graph in GraphML format.
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- All `nix-*` commands are now symlinks to `nix`. This saves a bit of
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disk space.
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- `nix repl` now uses `libeditline` or `libreadline`.
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