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execve: allow argv propagation

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tv 2016-02-13 16:45:26 +01:00
parent eb0797b7ed
commit 49efebaad7
1 changed files with 25 additions and 14 deletions
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39
krebs/5pkgs/builders.nix
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@ -1,19 +1,30 @@
{ lib, pkgs, ... }:
with lib;
{
execve = name: { filename, argv, envp ? {}, destination ? "" }:
writeC name { inherit destination; } ''
#include <unistd.h>
int main () {
const char *filename = ${toC filename};
char *const argv[] = ${toC (argv ++ [null])};
char *const envp[] = ${toC (
mapAttrsToList (k: v: "${k}=${v}") envp ++ [null]
)};
execve(filename, argv, envp);
return -1;
}
'';
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}"; });