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doc/manual/src/release-notes/rl-2.3.md

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+# Release 2.3 (2019-09-04)
+
+This is primarily a bug fix release. However, it makes some incompatible
+changes:
+
+  - Nix now uses BSD file locks instead of POSIX file locks. Because of
+    this, you should not use Nix 2.3 and previous releases at the same
+    time on a Nix store.
+
+It also has the following changes:
+
+  - `builtins.fetchGit`'s `ref` argument now allows specifying an
+    absolute remote ref. Nix will automatically prefix `ref` with
+    `refs/heads` only if `ref` doesn't already begin with `refs/`.
+
+  - The installer now enables sandboxing by default on Linux when the
+    system has the necessary kernel support.
+
+  - The `max-jobs` setting now defaults to 1.
+
+  - New builtin functions: `builtins.isPath`, `builtins.hashFile`.
+
+  - The `nix` command has a new `--print-build-logs` (`-L`) flag to
+    print build log output to stderr, rather than showing the last log
+    line in the progress bar. To distinguish between concurrent builds,
+    log lines are prefixed by the name of the package.
+
+  - Builds are now executed in a pseudo-terminal, and the TERM
+    environment variable is set to `xterm-256color`. This allows many
+    programs (e.g. `gcc`, `clang`, `cmake`) to print colorized log
+    output.
+
+  - Add `--no-net` convenience flag. This flag disables substituters;
+    sets the `tarball-ttl` setting to infinity (ensuring that any
+    previously downloaded files are considered current); and disables
+    retrying downloads and sets the connection timeout to the minimum.
+    This flag is enabled automatically if there are no configured
+    non-loopback network interfaces.
+
+  - Add a `post-build-hook` setting to run a program after a build has
+    succeeded.
+
+  - Add a `trace-function-calls` setting to log the duration of Nix
+    function calls to stderr.