diff options
Diffstat (limited to 'lib/systems/default.nix')
-rw-r--r-- | lib/systems/default.nix | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/systems/default.nix b/lib/systems/default.nix new file mode 100644 index 00000000000..d956969a18f --- /dev/null +++ b/lib/systems/default.nix @@ -0,0 +1,23 @@ +rec { + doubles = import ./doubles.nix; + parse = import ./parse.nix; + platforms = import ./platforms.nix; + + # Elaborate a `localSystem` or `crossSystem` so that it contains everything + # necessary. + # + # `parsed` is inferred from args, both because there are two options with one + # clearly prefered, and to prevent cycles. A simpler fixed point where the RHS + # always just used `final.*` would fail on both counts. + elaborate = args: let + final = { + # Prefer to parse `config` as it is strictly more informative. + parsed = parse.mkSystemFromString (if args ? config then args.config else args.system); + # Either of these can be losslessly-extracted from `parsed` iff parsing succeeds. + system = parse.doubleFromSystem final.parsed; + config = parse.tripleFromSystem final.parsed; + # Just a guess, based on `system` + platform = platforms.selectBySystem final.system; + } // args; + in final; +} |