cafkafk/nixpkgs
cafkafk/nixpkgs
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lib.systems: use explicit attrset instead of rec

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This allows refactoring in the file without accidentally modifying the
public interface of the file.

Also, pull in symbols consistently from `lib` instead of `builtins`.
This commit is contained in:
Philip Taron 2024-03-12 08:32:54 -07:00
parent b022be4d67
commit 5988f8f841
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1 changed files with 54 additions and 20 deletions
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74
lib/systems/default.nix
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@ -1,7 +1,25 @@
{ lib }:
let inherit (lib.attrsets) mapAttrs; in
rec {
let
inherit (lib)
any
filterAttrs
foldl
hasInfix
isFunction
isList
isString
mapAttrs
optional
optionalAttrs
optionalString
removeSuffix
replaceStrings
toUpper
;
inherit (lib.strings) toJSON;
doubles = import ./doubles.nix { inherit lib; };
parse = import ./parse.nix { inherit lib; };
inspect = import ./inspect.nix { inherit lib; };
@ -24,7 +42,7 @@ rec {
both arguments have been `elaborate`-d.
*/
equals =
let removeFunctions = a: lib.filterAttrs (_: v: !builtins.isFunction v) a;
let removeFunctions = a: filterAttrs (_: v: !isFunction v) a;
in a: b: removeFunctions a == removeFunctions b;
/* List of all Nix system doubles the nixpkgs flake will expose the package set
@ -41,7 +59,7 @@ rec {
# clearly preferred, and to prevent cycles. A simpler fixed point where the RHS
# always just used `final.*` would fail on both counts.
elaborate = args': let
args = if lib.isString args' then { system = args'; }
args = if isString args' then { system = args'; }
else args';
# TODO: deprecate args.rustc in favour of args.rust after 23.05 is EOL.
@ -96,7 +114,7 @@ rec {
then "lib64"
else "lib"
else null;
extensions = lib.optionalAttrs final.hasSharedLibraries {
extensions = optionalAttrs final.hasSharedLibraries {
sharedLibrary =
if final.isDarwin then ".dylib"
else if final.isWindows then ".dll"
@ -134,9 +152,9 @@ rec {
# uname -m
processor =
if final.isPower64
then "ppc64${lib.optionalString final.isLittleEndian "le"}"
then "ppc64${optionalString final.isLittleEndian "le"}"
else if final.isPower
then "ppc${lib.optionalString final.isLittleEndian "le"}"
then "ppc${optionalString final.isLittleEndian "le"}"
else if final.isMips64
then "mips64" # endianness is *not* included on mips64
else final.parsed.cpu.name;
@ -202,8 +220,8 @@ rec {
else if final.isS390 && !final.isS390x then null
else if final.isx86_64 then "x86_64"
else if final.isx86 then "i386"
else if final.isMips64n32 then "mipsn32${lib.optionalString final.isLittleEndian "el"}"
else if final.isMips64 then "mips64${lib.optionalString final.isLittleEndian "el"}"
else if final.isMips64n32 then "mipsn32${optionalString final.isLittleEndian "el"}"
else if final.isMips64 then "mips64${optionalString final.isLittleEndian "el"}"
else final.uname.processor;
# Name used by UEFI for architectures.
@ -255,7 +273,7 @@ rec {
if pkgs.stdenv.hostPlatform.canExecute final
then "${pkgs.runtimeShell} -c '\"$@\"' --"
else if final.isWindows
then "${wine}/bin/wine${lib.optionalString (final.parsed.cpu.bits == 64) "64"}"
then "${wine}/bin/wine${optionalString (final.parsed.cpu.bits == 64) "64"}"
else if final.isLinux && pkgs.stdenv.hostPlatform.isLinux && final.qemuArch != null
then "${qemu-user}/bin/qemu-${final.qemuArch}"
else if final.isWasi
@ -306,10 +324,10 @@ rec {
let
f = args.rustc.platform.target-family;
in
if builtins.isList f then f else [ f ]
if isList f then f else [ f ]
)
else lib.optional final.isUnix "unix"
++ lib.optional final.isWindows "windows";
else optional final.isUnix "unix"
++ optional final.isWindows "windows";
# https://doc.rust-lang.org/reference/conditional-compilation.html#target_vendor
vendor = let
@ -333,13 +351,13 @@ rec {
vendor_ = final.rust.platform.vendor;
# TODO: deprecate args.rustc in favour of args.rust after 23.05 is EOL.
in args.rust.rustcTarget or args.rustc.config
or "${cpu_}-${vendor_}-${kernel.name}${lib.optionalString (abi.name != "unknown") "-${abi.name}"}";
or "${cpu_}-${vendor_}-${kernel.name}${optionalString (abi.name != "unknown") "-${abi.name}"}";
# The name of the rust target if it is standard, or the json file
# containing the custom target spec.
rustcTargetSpec = rust.rustcTargetSpec or (
/**/ if rust ? platform
then builtins.toFile (final.rust.rustcTarget + ".json") (builtins.toJSON rust.platform)
then builtins.toFile (final.rust.rustcTarget + ".json") (toJSON rust.platform)
else final.rust.rustcTarget);
# The name of the rust target if it is standard, or the
@ -348,7 +366,7 @@ rec {
#
# This is the name used by Cargo for target subdirectories.
cargoShortTarget =
lib.removeSuffix ".json" (baseNameOf "${final.rust.rustcTargetSpec}");
removeSuffix ".json" (baseNameOf "${final.rust.rustcTargetSpec}");
# When used as part of an environment variable name, triples are
# uppercased and have all hyphens replaced by underscores:
@ -356,17 +374,17 @@ rec {
# https://github.com/rust-lang/cargo/pull/9169
# https://github.com/rust-lang/cargo/issues/8285#issuecomment-634202431
cargoEnvVarTarget =
lib.strings.replaceStrings ["-"] ["_"]
(lib.strings.toUpper final.rust.cargoShortTarget);
replaceStrings ["-"] ["_"]
(toUpper final.rust.cargoShortTarget);
# True if the target is no_std
# https://github.com/rust-lang/rust/blob/2e44c17c12cec45b6a682b1e53a04ac5b5fcc9d2/src/bootstrap/config.rs#L415-L421
isNoStdTarget =
builtins.any (t: lib.hasInfix t final.rust.rustcTarget) ["-none" "nvptx" "switch" "-uefi"];
any (t: hasInfix t final.rust.rustcTarget) ["-none" "nvptx" "switch" "-uefi"];
};
};
in assert final.useAndroidPrebuilt -> final.isAndroid;
assert lib.foldl
assert foldl
(pass: { assertion, message }:
if assertion final
then pass
@ -374,4 +392,20 @@ rec {
true
(final.parsed.abi.assertions or []);
final;
in
# Everything in this attrset is the public interface of the file.
{
inherit
architectures
doubles
elaborate
equals
examples
flakeExposed
inspect
parse
platforms
;
}