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https://github.com/LnL7/nix-darwin.git
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129 lines
4.4 KiB
Nix
129 lines
4.4 KiB
Nix
{ options, config, lib, ... }:
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with lib;
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let
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cfg = config.system;
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defaultStateVersion = options.system.stateVersion.default;
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# Based on `lib.trivial.revisionWithDefault` from nixpkgs.
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gitRevision = path:
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if pathIsGitRepo "${path}/.git"
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then commitIdFromGitRepo "${path}/.git"
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else if pathExists "${path}/.git-revision"
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then fileContents "${path}/.git-revision"
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else null;
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nixpkgsSrc = config.nixpkgs.source;
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# If `nixpkgs.constructedByUs` is true, then Nixpkgs was imported from
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# `nixpkgs.source` and we can use revision information (flake input,
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# `builtins.fetchGit`, etc.) from it. Otherwise `pkgs` could be
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# anything and we can't reliably determine exact version information,
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# but if the configuration explicitly sets `nixpkgs.source` we
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# trust it.
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useSourceRevision =
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(config.nixpkgs.constructedByUs
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|| options.nixpkgs.source.highestPrio < (lib.mkDefault {}).priority)
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&& isAttrs nixpkgsSrc
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&& (nixpkgsSrc._type or null == "flake"
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|| isString (nixpkgsSrc.rev or null));
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in
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{
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options = {
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system.stateVersion = mkOption {
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type = types.int;
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default = 4;
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description = ''
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Every once in a while, a new NixOS release may change
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configuration defaults in a way incompatible with stateful
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data. For instance, if the default version of PostgreSQL
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changes, the new version will probably be unable to read your
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existing databases. To prevent such breakage, you can set the
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value of this option to the NixOS release with which you want
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to be compatible. The effect is that NixOS will option
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defaults corresponding to the specified release (such as using
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an older version of PostgreSQL).
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'';
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};
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system.darwinLabel = mkOption {
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type = types.str;
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description = "Label to be used in the names of generated outputs.";
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};
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system.darwinVersion = mkOption {
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internal = true;
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type = types.str;
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default = "darwin${toString cfg.stateVersion}${cfg.darwinVersionSuffix}";
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description = "The full darwin version (e.g. `darwin4.2abdb5a`).";
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};
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system.darwinVersionSuffix = mkOption {
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internal = true;
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type = types.str;
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default = if cfg.darwinRevision != null
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then ".${substring 0 7 cfg.darwinRevision}"
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else "";
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description = "The short darwin version suffix (e.g. `.2abdb5a`).";
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};
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system.darwinRevision = mkOption {
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internal = true;
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type = types.nullOr types.str;
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default = gitRevision (toString ../..);
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description = "The darwin git revision from which this configuration was built.";
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};
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system.nixpkgsRelease = mkOption {
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readOnly = true;
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type = types.str;
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default = lib.trivial.release;
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description = "The nixpkgs release (e.g. `16.03`).";
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};
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system.nixpkgsVersion = mkOption {
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internal = true;
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type = types.str;
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default = cfg.nixpkgsRelease + cfg.nixpkgsVersionSuffix;
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description = "The full nixpkgs version (e.g. `16.03.1160.f2d4ee1`).";
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};
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system.nixpkgsVersionSuffix = mkOption {
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internal = true;
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type = types.str;
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default = if useSourceRevision
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then ".${lib.substring 0 8 (nixpkgsSrc.lastModifiedDate or nixpkgsSrc.lastModified or "19700101")}.${nixpkgsSrc.shortRev or "dirty"}"
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else lib.trivial.versionSuffix;
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description = "The short nixpkgs version suffix (e.g. `.1160.f2d4ee1`).";
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};
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system.nixpkgsRevision = mkOption {
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internal = true;
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type = types.nullOr types.str;
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default = if useSourceRevision && nixpkgsSrc ? rev
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then nixpkgsSrc.rev
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else lib.trivial.revisionWithDefault null;
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description = "The nixpkgs git revision from which this configuration was built.";
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};
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system.configurationRevision = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "The Git revision of the top-level flake from which this configuration was built.";
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};
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};
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config = {
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# This default is set here rather than up there so that the options
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# documentation is not reprocessed on every commit
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system.darwinLabel = mkDefault "${cfg.nixpkgsVersion}+${cfg.darwinVersion}";
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assertions = [ {
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assertion = cfg.stateVersion <= defaultStateVersion;
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message = "system.stateVersion = ${toString cfg.stateVersion}; is not a valid value";
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} ];
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};
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}
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