2020-07-22 21:17:48 +00:00
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# Release 0.13 (2009-11-05)
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This is primarily a bug fix release. It has some new features:
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- Syntactic sugar for writing nested attribute sets. Instead of
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{
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foo = {
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bar = 123;
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xyzzy = true;
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};
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a = { b = { c = "d"; }; };
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}
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you can write
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{
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foo.bar = 123;
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foo.xyzzy = true;
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a.b.c = "d";
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}
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This is useful, for instance, in NixOS configuration files.
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- Support for Nix channels generated by Hydra, the Nix-based
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continuous build system. (Hydra generates NAR archives on the fly,
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so the size and hash of these archives isn’t known in advance.)
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- Support `i686-linux` builds directly on `x86_64-linux` Nix
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installations. This is implemented using the `personality()`
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syscall, which causes `uname` to return `i686` in child processes.
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- Various improvements to the `chroot` support. Building in a `chroot`
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works quite well now.
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- Nix no longer blocks if it tries to build a path and another process
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is already building the same path. Instead it tries to build another
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buildable path first. This improves parallelism.
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- Support for large (\> 4 GiB) files in NAR archives.
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- Various (performance) improvements to the remote build mechanism.
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- New primops: `builtins.addErrorContext` (to add a string to stack
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traces — useful for debugging), `builtins.isBool`,
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`builtins.isString`, `builtins.isInt`, `builtins.intersectAttrs`.
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- OpenSolaris support (Sander van der Burg).
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- Stack traces are no longer displayed unless the `--show-trace`
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option is used.
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- The scoping rules for `inherit
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2020-07-23 12:28:05 +00:00
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(e) ...` in recursive attribute sets have changed. The expression
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*e* can now refer to the attributes defined in the containing set.
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