Commit Graph

13 Commits

Author SHA1 Message Date
Eelco Dolstra
a61b800da5 Fix backward compatibility with Nix < 1.6
"with" used to be less lazy, so don't rely on that.  Also don't use
the "<" operator.
2013-10-30 19:12:25 +01:00
Eelco Dolstra
70a2c54527 Strictly check the arguments to mkOption
And fix various instances of bad arguments.
2013-10-30 15:35:09 +01:00
Eelco Dolstra
800f9c2037 Show correct position info for errors in submodules
E.g.

  The unique option `fileSystems./.device' is defined multiple times, in `/etc/nixos/configuration.nix' and `/etc/nixos/foo.nix'.

This requires passing file/value tuples to the merge functions.
2013-10-30 14:57:43 +01:00
Eelco Dolstra
0afdb1e933 Add option type "str" for unique strings
An annoying and dangerous property of "types.string" is that it merges
multiple definitions by concatenating them, which almost never
produces a sensible result.  (Those options for which it does make
sense typically should use "types.lines" instead, and things only work
because the option definitions already end in a newline.)  Of course,
you can use "types.uniq types.string", but that's rather verbose, and
inconsistent with other basic types like "types.int".

Changing the behaviour of "types.string" to be unique by default is
not an option, given the large number of options that use it.  So
instead, we now have "types.str", which is equivalent to "types.uniq
types.string".
2013-10-29 13:45:30 +01:00
Eelco Dolstra
73f32d0375 Show precise error messages in option merge failures
For instance, if time.timeZone is defined multiple times, you now get
the error message:

  error: user-thrown exception: The unique option `time.timeZone' is defined multiple times, in `/etc/nixos/configurations/misc/eelco/x11vnc.nix' and `/etc/nixos/configuration.nix'.

while previously you got:

  error: user-thrown exception: Multiple definitions of string. Only one is allowed for this option.

and only an inspection of the stack trace gave a clue as to what
option caused the problem.
2013-10-28 22:45:57 +01:00
Eelco Dolstra
d5047faede Remove uses of the "merge" option attribute
It's redundant because you can (and should) specify an option type, or
an apply function.
2013-10-28 22:45:56 +01:00
Eelco Dolstra
f4a418761b Check for undeclared options 2013-10-28 22:45:56 +01:00
Eelco Dolstra
c263b5b284 Show error locations in submodules 2013-10-28 22:45:56 +01:00
Eelco Dolstra
89bd18b3af Fix manual generation 2013-10-28 22:45:56 +01:00
Eelco Dolstra
b479dac8df Inline some functions on the critical path 2013-10-28 22:45:55 +01:00
Eelco Dolstra
cfab329437 Use isType instead of typeOf 2013-10-28 22:45:55 +01:00
Eelco Dolstra
0e333688ce 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.
2013-10-28 22:45:55 +01:00
Eelco Dolstra
5fef92c4a0 Move pkgs/lib/ to lib/ 2013-10-10 13:28:21 +02:00