0e333688ce
The major changes are:
* The evaluation is now driven by the declared options. In
particular, this fixes the long-standing problem with lack of
laziness of disabled option definitions. Thus, a configuration like
config = mkIf false {
environment.systemPackages = throw "bla";
};
will now evaluate without throwing an error. This also improves
performance since we're not evaluating unused option definitions.
* The implementation of properties is greatly simplified.
* There is a new type constructor "submodule" that replaces
"optionSet". Unlike "optionSet", "submodule" gets its option
declarations as an argument, making it more like "listOf" and other
type constructors. A typical use is:
foo = mkOption {
type = type.attrsOf (type.submodule (
{ config, ... }:
{ bar = mkOption { ... };
xyzzy = mkOption { ... };
}));
};
Existing uses of "optionSet" are automatically mapped to
"submodule".
* Modules are now checked for unsupported attributes: you get an error
if a module contains an attribute other than "config", "options" or
"imports".
* The new implementation is faster and uses much less memory.
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|---|---|---|
| .. | ||
| test-driver | ||
| build-vms.nix | ||
| channel-expr.nix | ||
| eval-config.nix | ||
| from-env.nix | ||
| make-iso9660-image.nix | ||
| make-iso9660-image.sh | ||
| make-squashfs.nix | ||
| make-system-tarball.nix | ||
| make-system-tarball.sh | ||
| nixpkgs.nix | ||
| qemu-flags.nix | ||
| testing.nix | ||
| utils.nix | ||