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doc/manual/src/release-notes/rl-2.2.md

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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`.