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72 lines
2.4 KiB
Markdown
72 lines
2.4 KiB
Markdown
# Release 0.9 (2005-09-16)
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NOTE: this version of Nix uses Berkeley DB 4.3 instead of 4.2. The
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database is upgraded automatically, but you should be careful not to use
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old versions of Nix that still use Berkeley DB 4.2. In particular, if
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you use a Nix installed through Nix, you should run
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$ nix-store --clear-substitutes
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first.
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- Unpacking of patch sequences is much faster now since we no longer
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do redundant unpacking and repacking of intermediate paths.
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- Nix now uses Berkeley DB 4.3.
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- The `derivation` primitive is lazier. Attributes of dependent
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derivations can mutually refer to each other (as long as there are
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no data dependencies on the `outPath` and `drvPath` attributes
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computed by `derivation`).
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For example, the expression `derivation
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attrs` now evaluates to (essentially)
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attrs // {
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type = "derivation";
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outPath = derivation! attrs;
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drvPath = derivation! attrs;
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}
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where `derivation!` is a primop that does the actual derivation
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instantiation (i.e., it does what `derivation` used to do). The
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advantage is that it allows commands such as `nix-env -qa` and
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`nix-env -i` to be much faster since they no longer need to
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instantiate all derivations, just the `name` attribute.
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Also, it allows derivations to cyclically reference each other, for
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example,
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webServer = derivation {
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...
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hostName = "svn.cs.uu.nl";
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services = [svnService];
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};
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svnService = derivation {
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...
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hostName = webServer.hostName;
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};
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Previously, this would yield a black hole (infinite recursion).
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- `nix-build` now defaults to using `./default.nix` if no Nix
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expression is specified.
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- `nix-instantiate`, when applied to a Nix expression that evaluates
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to a function, will call the function automatically if all its
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arguments have defaults.
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- Nix now uses libtool to build dynamic libraries. This reduces the
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size of executables.
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- A new list concatenation operator `++`. For example, `[1 2 3] ++
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[4 5
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6]` evaluates to `[1 2 3 4 5
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6]`.
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- Some currently undocumented primops to support low-level build
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management using Nix (i.e., using Nix as a Make replacement). See
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the commit messages for `r3578` and `r3580`.
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- Various bug fixes and performance improvements.
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