src/runsh.c

#include "config.h"
 
#ifdef OS_NETBSD_C
#define _NETBSD_SOURCE 1
#endif
#define _POSIX_C_SOURCE 200809L
 
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
 
#include "q.h"
 
/* run a recipe's command. the child shell sources /etc/q.cfg (the same
 * general-purpose config q itself reads its prefix/db/pkgs from) before
 * exec'ing "$shell -e recipe cmd" -- so a config can set PATH, build
 * flags, proxies, or anything else a recipe's get/add/del/upd needs. the
 * -e keeps q's "fail loud, not silent" rule: a failing command inside a
 * recipe aborts the whole operation. q's own Q_PREFIX/Q_DB/Q_PKGS are
 * exported too, so a recipe knows where to install without the config
 * having to export them itself. */
int
runrecipe(const struct qcfg* c, const char* recipe, const char* cmd)
{
	pid_t pid;
	int status;
 
	pid = fork();
	if(pid < 0)
	{
		die("fork failed");
		return 1;
	}
	if(pid == 0)
	{
		setenv("Q_PREFIX", c->prefix, 1);
		setenv("Q_DB", c->db, 1);
		setenv("Q_PKGS", c->pkgs, 1);
		setenv("Q_CONF_PATH", c->conf, 1);
		execlp(c->shell, c->shell, "-e", "-c",
		    "[ -f \"$Q_CONF_PATH\" ] && . \"$Q_CONF_PATH\"; "
		    "exec \"$1\" -e \"$2\" \"$3\"",
		    c->shell, c->shell, recipe, cmd, (char*)NULL);
		_exit(127);
	}
	if(waitpid(pid, &status, 0) < 0)
	{
		die("waitpid failed");
		return 1;
	}
	if(!WIFEXITED(status) || WEXITSTATUS(status) != 0)
	{
		return 1;
	}
	return 0;
}