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author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-10-28 00:56:22 +0100 |
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committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-10-28 22:45:55 +0100 |
commit | 0e333688cea468a28516bf6935648c03ed62a7bb (patch) | |
tree | 06657556c1e80363a51010d546cac68b98fde90a /nixos/modules/config/shells-environment.nix | |
parent | f4dadc5df8561405df9aabf4fa2c2dcd13234b22 (diff) | |
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Big cleanup of the NixOS module system
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.
Diffstat (limited to 'nixos/modules/config/shells-environment.nix')
-rw-r--r-- | nixos/modules/config/shells-environment.nix | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/nixos/modules/config/shells-environment.nix b/nixos/modules/config/shells-environment.nix index 4f7447f435bc..5b8b6bc600ca 100644 --- a/nixos/modules/config/shells-environment.nix +++ b/nixos/modules/config/shells-environment.nix @@ -26,11 +26,10 @@ in type = types.attrsOf (mkOptionType { name = "a string or a list of strings"; merge = xs: - let xs' = evalProperties xs; in - if isList (head xs') then concatLists xs' - else if builtins.lessThan 1 (length xs') then abort "variable in ‘environment.variables’ has multiple values" - else if !builtins.isString (head xs') then abort "variable in ‘environment.variables’ does not have a string value" - else head xs'; + if isList (head xs) then concatLists xs + else if builtins.lessThan 1 (length xs) then abort "variable in ‘environment.variables’ has multiple values" + else if !builtins.isString (head xs) then abort "variable in ‘environment.variables’ does not have a string value" + else head xs; }); apply = mapAttrs (n: v: if isList v then concatStringsSep ":" v else v); }; |