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-rw-r--r--krebs/5pkgs/builders.nix62
1 files changed, 62 insertions, 0 deletions
diff --git a/krebs/5pkgs/builders.nix b/krebs/5pkgs/builders.nix
new file mode 100644
index 000000000..fa51857ba
--- /dev/null
+++ b/krebs/5pkgs/builders.nix
@@ -0,0 +1,62 @@
+{ 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=${makeSearchPath "bin" (with pkgs; [
+ binutils
+ coreutils
+ gcc
+ ])}
+ src=${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
+ '';
+}