debianutils/run_parts.c

/* vi: set sw=4 ts=4: */
/*
 * Mini run-parts implementation for busybox
 *
 *
 * Copyright (C) 2001 by Emanuele Aina <emanuele.aina@tiscali.it>
 *
 * Based on the Debian run-parts program, version 1.15
 *   Copyright (C) 1996 Jeff Noxon <jeff@router.patch.net>,
 *   Copyright (C) 1996-1999 Guy Maor <maor@debian.org>
 *   
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 */

/* This is my first attempt to write a program in C (well, this is my first
 * attempt to write a program! :-) . */

/* This piece of code is heavily based on the original version of run-parts,
 * taken from debian-utils. I've only removed the long options and a the 
 * report mode. As the original run-parts support only long options, I've
 * broken compatibility because the BusyBox policy doesn't allow them. 
 * The supported options are: 
 * -t			test. Print the name of the files to be executed, without
 * 				execute them.
 * -a ARG		argument. Pass ARG as an argument the program executed. It can 
 * 				be repeated to pass multiple arguments.
 * -u MASK 		umask. Set the umask of the program executed to MASK. */

/* TODO 
 * done - convert calls to error in perror... and remove error()
 * done - convert malloc/realloc to their x... counterparts 
 * done - remove catch_sigchld
 * done - use bb's concat_path_file() 
 * done - declare run_parts_main() as extern and any other function as static?
 */

#include <getopt.h>
#include <stdlib.h>

#include "libbb.h"

/* run_parts_main */
/* Process options */
int run_parts_main(int argc, char **argv)
{
	char **args = xmalloc(2 * sizeof(char *));
	unsigned char test_mode = 0;
	unsigned short argcount = 1;
	int opt;

	umask(022);

	while ((opt = getopt(argc, argv, "tu:a:")) != -1) {
		switch (opt) {
		case 't':		/* Enable test mode */
			test_mode = 1;
			break;
		case 'u':		/* Set the umask of the programs executed */
			/* Check and set the umask of the program executed. As stated in the original
			 * run-parts, the octal conversion in libc is not foolproof; it will take the 
			 * 8 and 9 digits under some circumstances. We'll just have to live with it.
			 */
			{
				const unsigned int mask = (unsigned int) strtol(optarg, NULL, 8);
				if (mask > 07777) {
					perror_msg_and_die("bad umask value");
				}
				umask(mask);
			}
			break;
		case 'a':		/* Pass an argument to the programs */
			/* Add an argument to the commands that we will call.
			 * Called once for every argument. */
			args = xrealloc(args, (argcount + 2) * (sizeof(char *)));
			args[argcount++] = optarg;
			break;
		default:
			show_usage();
		}
	}

	/* We require exactly one argument: the directory name */
	if (optind != (argc - 1)) {
		show_usage();
	}

	args[0] = argv[optind];
	args[argcount] = 0;

	return(run_parts(args, test_mode));
}