fsck_ext2fs.c

/*
 * fsck_ext2fs - wrapper for e2fsck on FreeBSD
 * Copyright (C) 2004,2006 Matthias Andree <[email protected]>
 * redistributable in accordance with the
 * GNU General Public License v2
 *
 * Upstream: $Id: fsck_ext2fs.c,v 1.6 2006/07/02 11:37:49 emma Exp $
 *
 * format: gindent -kr
 */

#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>

__attribute__ ((noreturn))
static int die(const char *tag)
{
	perror(tag);
	exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
	int ch, i = 1, force = 0, status, verbose = 0, t;
	long block = 0;
	enum { normal, preen, yes, no } mode = normal;
	char *cmd[256];
	pid_t pid;

	cmd[0] = "/sbin/e2fsck";
	while ((ch = getopt(argc, argv, "BFpfnyb:v")) != -1) {
		switch (ch) {
		case 'p':
			mode = preen;
			break;
		case 'f':
			force = 1;
			break;
		case 'n':
			mode = no;
			break;
		case 'y':
			mode = yes;
			break;
		case 'b':
			block = atol(optarg);
			break;
		case 'v':
			verbose++;
			break;
		case 'F':
			/* e2fsck does not support background checking,
			 * hence exit with nonzero status to force
			 * the foreground check. */
			exit(1);
		case 'B':
		default:
			fprintf(stderr, "%s: unknown option -%c\n",
				argv[0], optopt);
			exit(EXIT_FAILURE);
		}
	}

	if (force)
		cmd[i++] = "-f";

	switch (mode) {
	case normal:
		/* FreeBSD needs -f to force a check only in context
		 * with -p -- so map normal to force to match
		 * expectations */
		if (!force)
		    cmd[i++] = "-f";
		break;
	case yes:
		cmd[i++] = "-y";
		break;
	case no:
		cmd[i++] = "-n";
		break;
	case preen:
		cmd[i++] = "-p";
		break;
	}

	if (block) {
		static char b[30];

		sprintf(b, "-b %ld", block);
		cmd[i++] = b;
	}

	/* silently limit verbose to 15 so we don't overflow the cmd array */
	if (verbose > 15)
	    verbose = 15;

	for (t = verbose; t > 1; t--)
	    cmd[i++] = "-v";

	while (optind < argc) {
		cmd[i++] = argv[optind++];
		/* sanity check so we don't overflow the cmd buffer */
		if (i+1 == sizeof(cmd)/sizeof(cmd[0])) {
		    errno = E2BIG;
		    die(argv[0]);
		}
	}

	cmd[i++] = 0;

	if (verbose) {
		for (i=0; cmd[i]; i++)
			fputs(cmd[i], stderr),
			fputc(' ', stderr);
		fputc('\n', stderr);
	}

	pid = fork();
	switch (pid) {
	case -1:
		/* error */
		die("fork");
		break;
	case 0:
		/* child */
		(void) execv(cmd[0], cmd);
		perror("execve");
		_exit(127);
	default:
		/* parent */
		if (pid != waitpid(pid, &status, 0))
			die("waitpid");
		if (WIFSIGNALED(status)
		    || (WIFEXITED(status) && WEXITSTATUS(status) >= 4))
			exit(EXIT_FAILURE);
	}
	exit(EXIT_SUCCESS);
}