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# Release 1.7 (2014-04-11)
In addition to the usual bug fixes, this release has the following new
features:
- Antiquotation is now allowed inside of quoted attribute names (e.g.
`set."${foo}"`). In the case where the attribute name is just a
single antiquotation, the quotes can be dropped (e.g. the above
example can be written `set.${foo}`). If an attribute name inside of
a set declaration evaluates to `null` (e.g. `{ ${null} = false; }`),
then that attribute is not added to the set.
- Experimental support for cryptographically signed binary caches. See
[the commit for
details](https://github.com/NixOS/nix/commit/0fdf4da0e979f992db75cc17376e455ddc5a96d8).
- An experimental new substituter, `download-via-ssh`, that fetches
binaries from remote machines via SSH. Specifying the flags
`--option
use-ssh-substituter true --option ssh-substituter-hosts
user@hostname` will cause Nix to download binaries from the
specified machine, if it has them.
- `nix-store -r` and `nix-build` have a new flag, `--check`, that
builds a previously built derivation again, and prints an error
message if the output is not exactly the same. This helps to verify
whether a derivation is truly deterministic. For example:
$ nix-build '<nixpkgs>' -A patchelf
…
$ nix-build '<nixpkgs>' -A patchelf --check
…
error: derivation `/nix/store/1ipvxs…-patchelf-0.6' may not be deterministic:
hash mismatch in output `/nix/store/4pc1dm…-patchelf-0.6.drv'
- The `nix-instantiate` flags `--eval-only` and `--parse-only` have
been renamed to `--eval` and `--parse`, respectively.
- `nix-instantiate`, `nix-build` and `nix-shell` now have a flag
`--expr` (or `-E`) that allows you to specify the expression to be
evaluated as a command line argument. For instance, `nix-instantiate
--eval -E
'1 + 2'` will print `3`.
- `nix-shell` improvements:
- It has a new flag, `--packages` (or `-p`), that sets up a build
environment containing the specified packages from Nixpkgs. For
example, the command
$ nix-shell -p sqlite xorg.libX11 hello
will start a shell in which the given packages are present.
- It now uses `shell.nix` as the default expression, falling back
to `default.nix` if the former doesn’t exist. This makes it
convenient to have a `shell.nix` in your project to set up a
nice development environment.
- It evaluates the derivation attribute `shellHook`, if set. Since
`stdenv` does not normally execute this hook, it allows you to
do `nix-shell`-specific setup.
- It preserves the user’s timezone setting.
- In chroots, Nix now sets up a `/dev` containing only a minimal set
of devices (such as `/dev/null`). Note that it only does this if you
*don’t* have `/dev` listed in your `build-chroot-dirs` setting;
otherwise, it will bind-mount the `/dev` from outside the chroot.
Similarly, if you don’t have `/dev/pts` listed in
`build-chroot-dirs`, Nix will mount a private `devpts` filesystem on
the chroot’s `/dev/pts`.
- New built-in function: `builtins.toJSON`, which returns a JSON
representation of a value.
- `nix-env -q` has a new flag `--json` to print a JSON representation
of the installed or available packages.
- `nix-env` now supports meta attributes with more complex values,
such as attribute sets.
- The `-A` flag now allows attribute names with dots in them, e.g.
$ nix-instantiate --eval '<nixos>' -A 'config.systemd.units."nscd.service".text'
- The `--max-freed` option to `nix-store --gc` now accepts a unit
specifier. For example, `nix-store --gc --max-freed
1G` will free up to 1 gigabyte of disk space.
- `nix-collect-garbage` has a new flag `--delete-older-than` *N*`d`,
which deletes all user environment generations older than *N* days.
Likewise, `nix-env
--delete-generations` accepts a *N*`d` age limit.
- Nix now heuristically detects whether a build failure was due to a
disk-full condition. In that case, the build is not flagged as
“permanently failed”. This is mostly useful for Hydra, which needs
to distinguish between permanent and transient build failures.
- There is a new symbol `__curPos` that expands to an attribute set
containing its file name and line and column numbers, e.g. `{ file =
"foo.nix"; line = 10;
column = 5; }`. There also is a new builtin function,
`unsafeGetAttrPos`, that returns the position of an attribute. This
is used by Nixpkgs to provide location information in error
messages, e.g.
$ nix-build '<nixpkgs>' -A libreoffice --argstr system x86_64-darwin
error: the package ‘libreoffice-4.0.5.2’ in ‘.../applications/office/libreoffice/default.nix:263’
is not supported on ‘x86_64-darwin’
- The garbage collector is now more concurrent with other Nix
processes because it releases certain locks earlier.
- The binary tarball installer has been improved. You can now install
Nix by running:
$ bash <(curl -L https://nixos.org/nix/install)
- More evaluation errors include position information. For instance,
selecting a missing attribute will print something like
error: attribute `nixUnstabl' missing, at /etc/nixos/configurations/misc/eelco/mandark.nix:216:15
- The command `nix-setuid-helper` is gone.
- Nix no longer uses Automake, but instead has a non-recursive, GNU
Make-based build system.
- All installed libraries now have the prefix `libnix`. In particular,
this gets rid of `libutil`, which could clash with libraries with
the same name from other packages.
- Nix now requires a compiler that supports C++11.
This release has contributions from Danny Wilson, Domen Kožar, Eelco
Dolstra, Ian-Woo Kim, Ludovic Courtès, Maxim Ivanov, Petr Rockai,
Ricardo M. Correia and Shea Levy.
|
