2020-07-22 21:17:48 +00:00
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# Release 1.7 (2014-04-11)
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In addition to the usual bug fixes, this release has the following new
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features:
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- Antiquotation is now allowed inside of quoted attribute names (e.g.
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`set."${foo}"`). In the case where the attribute name is just a
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single antiquotation, the quotes can be dropped (e.g. the above
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example can be written `set.${foo}`). If an attribute name inside of
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a set declaration evaluates to `null` (e.g. `{ ${null} = false; }`),
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then that attribute is not added to the set.
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- Experimental support for cryptographically signed binary caches. See
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[the commit for
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details](https://github.com/NixOS/nix/commit/0fdf4da0e979f992db75cc17376e455ddc5a96d8).
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- An experimental new substituter, `download-via-ssh`, that fetches
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binaries from remote machines via SSH. Specifying the flags
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`--option
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use-ssh-substituter true --option ssh-substituter-hosts
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user@hostname` will cause Nix to download binaries from the
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specified machine, if it has them.
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- `nix-store -r` and `nix-build` have a new flag, `--check`, that
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builds a previously built derivation again, and prints an error
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message if the output is not exactly the same. This helps to verify
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whether a derivation is truly deterministic. For example:
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$ nix-build '<nixpkgs>' -A patchelf
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…
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$ nix-build '<nixpkgs>' -A patchelf --check
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…
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error: derivation `/nix/store/1ipvxs…-patchelf-0.6' may not be deterministic:
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hash mismatch in output `/nix/store/4pc1dm…-patchelf-0.6.drv'
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- The `nix-instantiate` flags `--eval-only` and `--parse-only` have
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been renamed to `--eval` and `--parse`, respectively.
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- `nix-instantiate`, `nix-build` and `nix-shell` now have a flag
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`--expr` (or `-E`) that allows you to specify the expression to be
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evaluated as a command line argument. For instance, `nix-instantiate
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--eval -E
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'1 + 2'` will print `3`.
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- `nix-shell` improvements:
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- It has a new flag, `--packages` (or `-p`), that sets up a build
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environment containing the specified packages from Nixpkgs. For
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example, the command
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$ nix-shell -p sqlite xorg.libX11 hello
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will start a shell in which the given packages are present.
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- It now uses `shell.nix` as the default expression, falling back
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to `default.nix` if the former doesn’t exist. This makes it
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convenient to have a `shell.nix` in your project to set up a
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nice development environment.
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- It evaluates the derivation attribute `shellHook`, if set. Since
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`stdenv` does not normally execute this hook, it allows you to
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do `nix-shell`-specific setup.
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- It preserves the user’s timezone setting.
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- In chroots, Nix now sets up a `/dev` containing only a minimal set
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of devices (such as `/dev/null`). Note that it only does this if you
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*don’t* have `/dev` listed in your `build-chroot-dirs` setting;
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otherwise, it will bind-mount the `/dev` from outside the chroot.
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Similarly, if you don’t have `/dev/pts` listed in
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`build-chroot-dirs`, Nix will mount a private `devpts` filesystem on
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the chroot’s `/dev/pts`.
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- New built-in function: `builtins.toJSON`, which returns a JSON
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representation of a value.
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- `nix-env -q` has a new flag `--json` to print a JSON representation
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of the installed or available packages.
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- `nix-env` now supports meta attributes with more complex values,
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such as attribute sets.
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- The `-A` flag now allows attribute names with dots in them, e.g.
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$ nix-instantiate --eval '<nixos>' -A 'config.systemd.units."nscd.service".text'
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- The `--max-freed` option to `nix-store --gc` now accepts a unit
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specifier. For example, `nix-store --gc --max-freed
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1G` will free up to 1 gigabyte of disk space.
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2020-07-23 12:28:05 +00:00
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- `nix-collect-garbage` has a new flag `--delete-older-than` *N*`d`,
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which deletes all user environment generations older than *N* days.
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2020-07-22 21:17:48 +00:00
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Likewise, `nix-env
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2020-07-23 12:28:05 +00:00
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--delete-generations` accepts a *N*`d` age limit.
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2020-07-22 21:17:48 +00:00
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- Nix now heuristically detects whether a build failure was due to a
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disk-full condition. In that case, the build is not flagged as
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“permanently failed”. This is mostly useful for Hydra, which needs
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to distinguish between permanent and transient build failures.
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- There is a new symbol `__curPos` that expands to an attribute set
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containing its file name and line and column numbers, e.g. `{ file =
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"foo.nix"; line = 10;
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column = 5; }`. There also is a new builtin function,
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`unsafeGetAttrPos`, that returns the position of an attribute. This
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is used by Nixpkgs to provide location information in error
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messages, e.g.
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$ nix-build '<nixpkgs>' -A libreoffice --argstr system x86_64-darwin
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error: the package ‘libreoffice-4.0.5.2’ in ‘.../applications/office/libreoffice/default.nix:263’
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is not supported on ‘x86_64-darwin’
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- The garbage collector is now more concurrent with other Nix
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processes because it releases certain locks earlier.
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- The binary tarball installer has been improved. You can now install
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Nix by running:
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2020-09-12 20:08:40 +00:00
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$ bash <(curl -L https://nixos.org/nix/install)
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2020-07-22 21:17:48 +00:00
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- More evaluation errors include position information. For instance,
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selecting a missing attribute will print something like
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error: attribute `nixUnstabl' missing, at /etc/nixos/configurations/misc/eelco/mandark.nix:216:15
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- The command `nix-setuid-helper` is gone.
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- Nix no longer uses Automake, but instead has a non-recursive, GNU
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Make-based build system.
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- All installed libraries now have the prefix `libnix`. In particular,
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this gets rid of `libutil`, which could clash with libraries with
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the same name from other packages.
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- Nix now requires a compiler that supports C++11.
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This release has contributions from Danny Wilson, Domen Kožar, Eelco
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Dolstra, Ian-Woo Kim, Ludovic Courtès, Maxim Ivanov, Petr Rockai,
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Ricardo M. Correia and Shea Levy.
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