mirror of
https://github.com/numtide/flake-utils.git
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introduce externally extensible systems (#93)
This PR is a back-compatible subset of #84. By adding a new flake input here, it makes it possible to override the list of systems using flake overrides. See <https://github.com/nix-systems/nix-systems> for the full explanation.
This commit is contained in:
Jonas Chevalier
GitHub
parent
13faa43c34
commit
1c226cc8c6
4 changed files with 265 additions and 230 deletions
230
default.nix
230
default.nix
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@ -1,228 +1,2 @@
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let
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# Used for back-compat
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# The list of systems supported by nixpkgs and hydra
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import ./lib.nix { }
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defaultSystems = [
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"aarch64-linux"
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"aarch64-darwin"
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"x86_64-darwin"
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"x86_64-linux"
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];
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# List of all systems defined in nixpkgs
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# Keep in sync with nixpkgs wit the following command:
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# $ nix-instantiate --json --eval --expr "with import <nixpkgs> {}; lib.platforms.all" | jq 'sort' | sed 's!,!!'
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allSystems = [
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"aarch64-darwin"
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"aarch64-genode"
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"aarch64-linux"
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"aarch64-netbsd"
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"aarch64-none"
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"aarch64_be-none"
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"arm-none"
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"armv5tel-linux"
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"armv6l-linux"
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"armv6l-netbsd"
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"armv6l-none"
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"armv7a-darwin"
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"armv7a-linux"
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"armv7a-netbsd"
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"armv7l-linux"
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"armv7l-netbsd"
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"avr-none"
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"i686-cygwin"
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"i686-darwin"
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"i686-freebsd"
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"i686-genode"
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"i686-linux"
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"i686-netbsd"
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"i686-none"
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"i686-openbsd"
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"i686-windows"
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"js-ghcjs"
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"m68k-linux"
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"m68k-netbsd"
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"m68k-none"
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"mips64el-linux"
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"mipsel-linux"
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"mipsel-netbsd"
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"mmix-mmixware"
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"msp430-none"
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"or1k-none"
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"powerpc-netbsd"
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"powerpc-none"
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"powerpc64-linux"
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"powerpc64le-linux"
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"powerpcle-none"
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"riscv32-linux"
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"riscv32-netbsd"
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"riscv32-none"
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"riscv64-linux"
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"riscv64-netbsd"
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"riscv64-none"
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"s390-linux"
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"s390-none"
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"s390x-linux"
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"s390x-none"
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"vc4-none"
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"wasm32-wasi"
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"wasm64-wasi"
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"x86_64-cygwin"
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"x86_64-darwin"
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"x86_64-freebsd"
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"x86_64-genode"
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"x86_64-linux"
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"x86_64-netbsd"
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"x86_64-none"
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"x86_64-openbsd"
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"x86_64-redox"
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"x86_64-solaris"
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"x86_64-windows"
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];
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# A map from system to system. It's useful to detect typos.
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#
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# Instead of typing `"x86_64-linux"`, type `flake-utils.lib.system.x86_64-linux`
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# and get an error back if you used a dash instead of an underscore.
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system =
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builtins.listToAttrs
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(map (system: { name = system; value = system; }) allSystems);
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# eachSystem using defaultSystems
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eachDefaultSystem = eachSystem defaultSystems;
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# Builds a map from <attr>=value to <attr>.<system>=value for each system,
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# except for the `hydraJobs` attribute, where it maps the inner attributes,
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# from hydraJobs.<attr>=value to hydraJobs.<attr>.<system>=value.
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#
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eachSystem = systems: f:
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let
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# Taken from <nixpkgs/lib/attrsets.nix>
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isDerivation = x: builtins.isAttrs x && x ? type && x.type == "derivation";
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# Used to match Hydra's convention of how to define jobs. Basically transforms
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#
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# hydraJobs = {
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# hello = <derivation>;
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# haskellPackages.aeson = <derivation>;
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# }
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#
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# to
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#
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# hydraJobs = {
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# hello.x86_64-linux = <derivation>;
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# haskellPackages.aeson.x86_64-linux = <derivation>;
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# }
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#
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# if the given flake does `eachSystem [ "x86_64-linux" ] { ... }`.
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pushDownSystem = system: merged:
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builtins.mapAttrs
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(name: value:
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if ! (builtins.isAttrs value) then value
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else if isDerivation value then (merged.${name} or {}) // { ${system} = value; }
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else pushDownSystem system (merged.${name} or {}) value);
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# Merge together the outputs for all systems.
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op = attrs: system:
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let
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ret = f system;
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op = attrs: key:
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let
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appendSystem = key: system: ret:
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if key == "hydraJobs"
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then (pushDownSystem system (attrs.hydraJobs or {}) ret.hydraJobs)
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else { ${system} = ret.${key}; };
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in attrs //
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{
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${key} = (attrs.${key} or { })
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// (appendSystem key system ret);
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}
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;
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in
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builtins.foldl' op attrs (builtins.attrNames ret);
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in
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builtins.foldl' op { } systems
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;
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# eachSystemMap using defaultSystems
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eachDefaultSystemMap = eachSystemMap defaultSystems;
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# Builds a map from <attr>=value to <system>.<attr> = value.
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eachSystemMap = systems: f: builtins.listToAttrs (builtins.map (system: { name = system; value = f system; }) systems);
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# Nix flakes insists on having a flat attribute set of derivations in
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# various places like the `packages` and `checks` attributes.
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#
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# This function traverses a tree of attributes (by respecting
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# recurseIntoAttrs) and only returns their derivations, with a flattened
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# key-space.
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#
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# Eg:
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#
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# flattenTree { hello = pkgs.hello; gitAndTools = pkgs.gitAndTools };
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#
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# Returns:
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#
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# {
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# hello = «derivation»;
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# "gitAndTools/git" = «derivation»;
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# "gitAndTools/hub" = «derivation»;
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# # ...
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# }
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flattenTree = tree: import ./flattenTree.nix tree;
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# Nix check functionality validates packages for various conditions, like if
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# they build for any given platform or if they are marked broken.
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#
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# This function filters a flattend package set for conditinos that
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# would *trivially* break `nix flake check`. It does not flatten a tree and it
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# does not implement advanced package validation checks.
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#
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# Eg:
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#
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# filterPackages "x86_64-linux" {
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# hello = pkgs.hello;
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# "gitAndTools/git" = pkgs.gitAndTools // {meta.broken = true;};
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# };
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#
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# Returns:
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#
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# {
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# hello = «derivation»;
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# }
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filterPackages = import ./filterPackages.nix { inherit allSystems; };
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# Returns the structure used by `nix app`
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mkApp =
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{ drv
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, name ? drv.pname or drv.name
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, exePath ? drv.passthru.exePath or "/bin/${name}"
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}:
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{
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type = "app";
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program = "${drv}${exePath}";
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};
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# This function tries to capture a common flake pattern.
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simpleFlake = import ./simpleFlake.nix { inherit lib defaultSystems; };
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# Helper functions for Nix evaluation
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check-utils = import ./check-utils.nix;
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lib = {
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inherit
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allSystems
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check-utils
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defaultSystems
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eachDefaultSystem
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eachSystem
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eachDefaultSystemMap
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eachSystemMap
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filterPackages
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flattenTree
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mkApp
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simpleFlake
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system
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;
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};
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in
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lib
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26
flake.lock
Normal file
26
flake.lock
Normal file
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@ -0,0 +1,26 @@
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{
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"nodes": {
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"root": {
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"inputs": {
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"systems": "systems"
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}
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},
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"systems": {
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"locked": {
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"lastModified": 1681028828,
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"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
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"owner": "nix-systems",
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"repo": "default",
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"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
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"type": "github"
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},
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"original": {
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"owner": "nix-systems",
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"repo": "default",
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"type": "github"
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}
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}
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},
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"root": "root",
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"version": 7
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}
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10
flake.nix
10
flake.nix
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{
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{
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description = "Pure Nix flake utility functions";
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description = "Pure Nix flake utility functions";
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outputs = { self }: {
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lib = import ./.;
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# Externally extensible flake systems. See <https://github.com/nix-systems/nix-systems>.
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inputs.systems.url = "github:nix-systems/default";
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outputs = { self, systems }: {
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lib = import ./lib.nix {
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defaultSystems = import systems;
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};
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templates = {
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templates = {
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simple-flake = {
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simple-flake = {
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path = ./examples/simple-flake;
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path = ./examples/simple-flake;
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229
lib.nix
Normal file
229
lib.nix
Normal file
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{
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# The list of systems supported by nixpkgs and hydra
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defaultSystems ? [
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"aarch64-linux"
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"aarch64-darwin"
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"x86_64-darwin"
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"x86_64-linux"
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]
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}:
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let
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# List of all systems defined in nixpkgs
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# Keep in sync with nixpkgs wit the following command:
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# $ nix-instantiate --json --eval --expr "with import <nixpkgs> {}; lib.platforms.all" | jq 'sort' | sed 's!,!!'
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allSystems = [
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"aarch64-darwin"
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"aarch64-genode"
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"aarch64-linux"
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"aarch64-netbsd"
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"aarch64-none"
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"aarch64_be-none"
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"arm-none"
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"armv5tel-linux"
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"armv6l-linux"
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"armv6l-netbsd"
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"armv6l-none"
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"armv7a-darwin"
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"armv7a-linux"
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"armv7a-netbsd"
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"armv7l-linux"
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"armv7l-netbsd"
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"avr-none"
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"i686-cygwin"
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"i686-darwin"
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"i686-freebsd"
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"i686-genode"
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"i686-linux"
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"i686-netbsd"
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"i686-none"
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"i686-openbsd"
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"i686-windows"
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"js-ghcjs"
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"m68k-linux"
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"m68k-netbsd"
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||||||
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"m68k-none"
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"mips64el-linux"
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"mipsel-linux"
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"mipsel-netbsd"
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||||||
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"mmix-mmixware"
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"msp430-none"
|
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"or1k-none"
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"powerpc-netbsd"
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"powerpc-none"
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"powerpc64-linux"
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"powerpc64le-linux"
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"powerpcle-none"
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"riscv32-linux"
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"riscv32-netbsd"
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"riscv32-none"
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"riscv64-linux"
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"riscv64-netbsd"
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"riscv64-none"
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"s390-linux"
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"s390-none"
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"s390x-linux"
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"s390x-none"
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"vc4-none"
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||||||
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"wasm32-wasi"
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"wasm64-wasi"
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"x86_64-cygwin"
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"x86_64-darwin"
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"x86_64-freebsd"
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||||||
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"x86_64-genode"
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"x86_64-linux"
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"x86_64-netbsd"
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"x86_64-none"
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"x86_64-openbsd"
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"x86_64-redox"
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"x86_64-solaris"
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"x86_64-windows"
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|
];
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|
|
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|
# A map from system to system. It's useful to detect typos.
|
||||||
|
#
|
||||||
|
# Instead of typing `"x86_64-linux"`, type `flake-utils.lib.system.x86_64-linux`
|
||||||
|
# and get an error back if you used a dash instead of an underscore.
|
||||||
|
system =
|
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|
builtins.listToAttrs
|
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|
(map (system: { name = system; value = system; }) allSystems);
|
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|
|
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|
# eachSystem using defaultSystems
|
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|
eachDefaultSystem = eachSystem defaultSystems;
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||||||
|
|
||||||
|
# Builds a map from <attr>=value to <attr>.<system>=value for each system,
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||||||
|
# except for the `hydraJobs` attribute, where it maps the inner attributes,
|
||||||
|
# from hydraJobs.<attr>=value to hydraJobs.<attr>.<system>=value.
|
||||||
|
#
|
||||||
|
eachSystem = systems: f:
|
||||||
|
let
|
||||||
|
# Taken from <nixpkgs/lib/attrsets.nix>
|
||||||
|
isDerivation = x: builtins.isAttrs x && x ? type && x.type == "derivation";
|
||||||
|
|
||||||
|
# Used to match Hydra's convention of how to define jobs. Basically transforms
|
||||||
|
#
|
||||||
|
# hydraJobs = {
|
||||||
|
# hello = <derivation>;
|
||||||
|
# haskellPackages.aeson = <derivation>;
|
||||||
|
# }
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|
#
|
||||||
|
# to
|
||||||
|
#
|
||||||
|
# hydraJobs = {
|
||||||
|
# hello.x86_64-linux = <derivation>;
|
||||||
|
# haskellPackages.aeson.x86_64-linux = <derivation>;
|
||||||
|
# }
|
||||||
|
#
|
||||||
|
# if the given flake does `eachSystem [ "x86_64-linux" ] { ... }`.
|
||||||
|
pushDownSystem = system: merged:
|
||||||
|
builtins.mapAttrs
|
||||||
|
(name: value:
|
||||||
|
if ! (builtins.isAttrs value) then value
|
||||||
|
else if isDerivation value then (merged.${name} or {}) // { ${system} = value; }
|
||||||
|
else pushDownSystem system (merged.${name} or {}) value);
|
||||||
|
|
||||||
|
# Merge together the outputs for all systems.
|
||||||
|
op = attrs: system:
|
||||||
|
let
|
||||||
|
ret = f system;
|
||||||
|
op = attrs: key:
|
||||||
|
let
|
||||||
|
appendSystem = key: system: ret:
|
||||||
|
if key == "hydraJobs"
|
||||||
|
then (pushDownSystem system (attrs.hydraJobs or {}) ret.hydraJobs)
|
||||||
|
else { ${system} = ret.${key}; };
|
||||||
|
in attrs //
|
||||||
|
{
|
||||||
|
${key} = (attrs.${key} or { })
|
||||||
|
// (appendSystem key system ret);
|
||||||
|
}
|
||||||
|
;
|
||||||
|
in
|
||||||
|
builtins.foldl' op attrs (builtins.attrNames ret);
|
||||||
|
in
|
||||||
|
builtins.foldl' op { } systems
|
||||||
|
;
|
||||||
|
|
||||||
|
# eachSystemMap using defaultSystems
|
||||||
|
eachDefaultSystemMap = eachSystemMap defaultSystems;
|
||||||
|
|
||||||
|
# Builds a map from <attr>=value to <system>.<attr> = value.
|
||||||
|
eachSystemMap = systems: f: builtins.listToAttrs (builtins.map (system: { name = system; value = f system; }) systems);
|
||||||
|
|
||||||
|
# Nix flakes insists on having a flat attribute set of derivations in
|
||||||
|
# various places like the `packages` and `checks` attributes.
|
||||||
|
#
|
||||||
|
# This function traverses a tree of attributes (by respecting
|
||||||
|
# recurseIntoAttrs) and only returns their derivations, with a flattened
|
||||||
|
# key-space.
|
||||||
|
#
|
||||||
|
# Eg:
|
||||||
|
#
|
||||||
|
# flattenTree { hello = pkgs.hello; gitAndTools = pkgs.gitAndTools };
|
||||||
|
#
|
||||||
|
# Returns:
|
||||||
|
#
|
||||||
|
# {
|
||||||
|
# hello = «derivation»;
|
||||||
|
# "gitAndTools/git" = «derivation»;
|
||||||
|
# "gitAndTools/hub" = «derivation»;
|
||||||
|
# # ...
|
||||||
|
# }
|
||||||
|
flattenTree = tree: import ./flattenTree.nix tree;
|
||||||
|
|
||||||
|
# Nix check functionality validates packages for various conditions, like if
|
||||||
|
# they build for any given platform or if they are marked broken.
|
||||||
|
#
|
||||||
|
# This function filters a flattend package set for conditinos that
|
||||||
|
# would *trivially* break `nix flake check`. It does not flatten a tree and it
|
||||||
|
# does not implement advanced package validation checks.
|
||||||
|
#
|
||||||
|
# Eg:
|
||||||
|
#
|
||||||
|
# filterPackages "x86_64-linux" {
|
||||||
|
# hello = pkgs.hello;
|
||||||
|
# "gitAndTools/git" = pkgs.gitAndTools // {meta.broken = true;};
|
||||||
|
# };
|
||||||
|
#
|
||||||
|
# Returns:
|
||||||
|
#
|
||||||
|
# {
|
||||||
|
# hello = «derivation»;
|
||||||
|
# }
|
||||||
|
filterPackages = import ./filterPackages.nix { inherit allSystems; };
|
||||||
|
|
||||||
|
# Returns the structure used by `nix app`
|
||||||
|
mkApp =
|
||||||
|
{ drv
|
||||||
|
, name ? drv.pname or drv.name
|
||||||
|
, exePath ? drv.passthru.exePath or "/bin/${name}"
|
||||||
|
}:
|
||||||
|
{
|
||||||
|
type = "app";
|
||||||
|
program = "${drv}${exePath}";
|
||||||
|
};
|
||||||
|
|
||||||
|
# This function tries to capture a common flake pattern.
|
||||||
|
simpleFlake = import ./simpleFlake.nix { inherit lib defaultSystems; };
|
||||||
|
|
||||||
|
# Helper functions for Nix evaluation
|
||||||
|
check-utils = import ./check-utils.nix;
|
||||||
|
|
||||||
|
lib = {
|
||||||
|
inherit
|
||||||
|
allSystems
|
||||||
|
check-utils
|
||||||
|
defaultSystems
|
||||||
|
eachDefaultSystem
|
||||||
|
eachSystem
|
||||||
|
eachDefaultSystemMap
|
||||||
|
eachSystemMap
|
||||||
|
filterPackages
|
||||||
|
flattenTree
|
||||||
|
mkApp
|
||||||
|
simpleFlake
|
||||||
|
system
|
||||||
|
;
|
||||||
|
};
|
||||||
|
in
|
||||||
|
lib
|
||||||
Loading…
Reference in a new issue