{ config, lib, pkgs, ... }: with config.krebs.lib; rec { execve = name: { filename, argv ? null, envp ? {}, destination ? "" }: let in writeC name { inherit destination; } '' #include <unistd.h> static char *const filename = ${toC filename}; ${if argv == null then /* Propagate arguments */ '' #define MAIN_ARGS int argc, char **argv '' else /* Provide fixed arguments */ '' #define MAIN_ARGS void static char *const argv[] = ${toC (argv ++ [null])}; ''} static char *const envp[] = ${toC ( mapAttrsToList (k: v: "${k}=${v}") envp ++ [null] )}; int main (MAIN_ARGS) { execve(filename, argv, envp); return -1; } ''; execveBin = name: cfg: execve name (cfg // { destination = "/bin/${name}"; }); writeC = name: { destination ? "" }: src: pkgs.runCommand name {} '' PATH=${makeBinPath (with pkgs; [ binutils coreutils gcc ])} src=${pkgs.writeText "${name}.c" src} exe=$out${destination} mkdir -p "$(dirname "$exe")" gcc -O -Wall -o "$exe" $src strip --strip-unneeded "$exe" ''; writeDash = name: text: pkgs.writeScript name '' #! ${pkgs.dash}/bin/dash ${text} ''; writeDashBin = name: text: pkgs.writeTextFile { executable = true; destination = "/bin/${name}"; name = name; text = '' #! ${pkgs.dash}/bin/dash ${text} ''; }; writeNixFromCabal = name: path: pkgs.runCommand name {} '' ${pkgs.cabal2nix}/bin/cabal2nix ${path} > $out ''; }