2020-07-22 21:17:48 +00:00
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# Release 1.6 (2013-09-10)
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In addition to the usual bug fixes, this release has several new
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features:
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- The command `nix-build --run-env` has been renamed to `nix-shell`.
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- `nix-shell` now sources `$stdenv/setup` *inside* the interactive
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shell, rather than in a parent shell. This ensures that shell
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functions defined by `stdenv` can be used in the interactive shell.
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- `nix-shell` has a new flag `--pure` to clear the environment, so you
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get an environment that more closely corresponds to the “real” Nix
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build.
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2020-07-23 08:44:54 +00:00
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- `nix-shell` now sets the shell prompt (`PS1`) to ensure that Nix
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2020-07-22 21:17:48 +00:00
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shells are distinguishable from your regular shells.
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- `nix-env` no longer requires a `*` argument to match all packages,
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so `nix-env -qa` is equivalent to `nix-env
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-qa '*'`.
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- `nix-env -i` has a new flag `--remove-all` (`-r`) to remove all
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previous packages from the profile. This makes it easier to do
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declarative package management similar to NixOS’s
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`environment.systemPackages`. For instance, if you have a
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specification `my-packages.nix` like this:
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with import <nixpkgs> {};
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[ thunderbird
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geeqie
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...
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]
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then after any change to this file, you can run:
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$ nix-env -f my-packages.nix -ir
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to update your profile to match the specification.
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- The ‘`with`’ language construct is now more lazy. It only evaluates
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its argument if a variable might actually refer to an attribute in
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the argument. For instance, this now works:
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let
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pkgs = with pkgs; { foo = "old"; bar = foo; } // overrides;
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overrides = { foo = "new"; };
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in pkgs.bar
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This evaluates to `"new"`, while previously it gave an “infinite
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recursion” error.
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- Nix now has proper integer arithmetic operators. For instance, you
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can write `x + y` instead of `builtins.add x y`, or `x <
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y` instead of `builtins.lessThan x y`. The comparison operators also
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work on strings.
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- On 64-bit systems, Nix integers are now 64 bits rather than 32 bits.
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- When using the Nix daemon, the `nix-daemon` worker process now runs
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on the same CPU as the client, on systems that support setting CPU
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affinity. This gives a significant speedup on some systems.
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- If a stack overflow occurs in the Nix evaluator, you now get a
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proper error message (rather than “Segmentation fault”) on some
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systems.
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- In addition to directories, you can now bind-mount regular files in
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chroots through the (now misnamed) option `build-chroot-dirs`.
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This release has contributions from Domen Kožar, Eelco Dolstra, Florian
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Friesdorf, Gergely Risko, Ivan Kozik, Ludovic Courtès and Shea Levy.
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