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74 lines
2.7 KiB
74 lines
2.7 KiB
buildArgs@{ nixpkgs ? <nixpkgs>, pkgs ? import nixpkgs {}, lib ? import ./lib.nix { inherit pkgs; }, root, filter ? [] }:
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let
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inherit (lib) searchPath whichdo d1 d2 getSrc;
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resolve = path: let
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builder = (whichdo path);
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in if builder == "" then throw "No rule to build ${path}"
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else runBuilder (d1 path builder) (d2 path builder) builder;
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runBuilder = d1: d2: builder:
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with pkgs.lib;
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with builtins;
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let
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# CWD relative to source root
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rcwd = dirOf (removePrefix (root + "/") builder);
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# Funktionalise pkgs; our main entry point to resolve default*nix build
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# scripts.
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funcPkgs = {
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__functor = self: arg: resolve arg;
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src = getSrc root rcwd filter resolve id;
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inherit pkgs rcwd d1 d2;
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# Convenience function that calculates the source tree, links it to src
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# and cd's to the location of the current builder.
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S = getSrc root rcwd filter resolve (src: ''
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ln -s ${src} src
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cd src/${rcwd}
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'');
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};
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_builder = let
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imported = (tryEval (let
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# Needs to be done as nix chokes on empty files rn.
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# Potential source of memory exhaustion for untrusted very large *.do files!
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content = readFile builder;
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in assert content != "" && (! (hasPrefix "#!" content)); import builder));
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in if imported.success
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then imported.value
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else {
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src = getSrc (/. + root);
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builder = ''
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#!/bin/sh
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set -e
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pout=$(mktemp -u -p $PWD)
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cp -r --reflink=auto --no-preserve=mode "$src/" src
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cd src/${rcwd}
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${/. + builder} "$d1" "$d2" "$out" >$pout
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if [ -e "$out" -a -s "$pout" ]; then
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printf "Error: %s wrote to stdout and created \$3\n" "${baseNameOf builder}" >&2
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exit 207
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elif [ -s $pout ]; then
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mv $pout $out
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fi
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'';
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};
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__builder = if isFunction _builder then _builder funcPkgs
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else _builder;
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args = { stdenv = pkgs.stdenvNoCC; } // (if isString __builder
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then { builder = __builder; }
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else __builder);
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drv = (args.deriver or args.stdenv.mkDerivation) ({
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name = pkgs.lib.strings.sanitizeDerivationName d1;
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buildCommand = args.builder;
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passAsFile = [ "buildCommand" ];
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preferLocalBuild = true;
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allowSubstitutes = false;
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outputs = [ "out" ];
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inherit d1 d2;
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} // (removeAttrs args [ "builder" "system" "deriver" "stdenv" "outputs" ]));
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in drv; # myself
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in resolve
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