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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.
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