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