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/*
* find matching entry in fstab and export it
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.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.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <mntent.h>
#include <sys/stat.h>
#include "../../udev/udev.h"
static int debug;
static char root[PATH_SIZE] = "/dev";
static char **devices;
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
static int udev_log = -1;
if (udev_log == -1) {
const char *value;
value = getenv("UDEV_LOG");
if (value)
udev_log = log_priority(value);
else
udev_log = LOG_ERR;
if (debug && udev_log < LOG_INFO)
udev_log = LOG_INFO;
}
if (priority > udev_log)
return;
va_start(args, format);
if (debug) {
fprintf(stderr, "[%d] ", (int) getpid());
vfprintf(stderr, format, args);
} else
vsyslog(priority, format, args);
va_end(args);
}
#endif
static int matches_device_list(const char *name)
{
int i;
for (i = 0; devices[i] != NULL; i++) {
info("compare '%s' == '%s'\n", name, devices[i]);
if (strcmp(devices[i], name) == 0)
return 1;
}
return 0;
}
static void print_fstab_entry(struct mntent *mnt)
{
printf("FSTAB_NAME=%s\n", mnt->mnt_fsname);
printf("FSTAB_DIR=%s\n", mnt->mnt_dir);
printf("FSTAB_TYPE=%s\n", mnt->mnt_type);
printf("FSTAB_OPTS=%s\n", mnt->mnt_opts);
printf("FSTAB_FREQ=%d\n", mnt->mnt_freq);
printf("FSTAB_PASSNO=%d\n", mnt->mnt_passno);
}
int main(int argc, char *argv[])
{
static const struct option options[] = {
{ "export", 0, NULL, 'x' },
{ "root", 1, NULL, 'r' },
{ "debug", 0, NULL, 'd' },
{ "help", 0, NULL, 'h' },
{}
};
FILE *fp;
struct mntent *mnt;
int rc = 0;
logging_init("fstab_id");
while (1) {
int option;
option = getopt_long(argc, argv, "dr:xh", options, NULL);
if (option == -1)
break;
switch (option) {
case 'r':
strlcpy(root, optarg, sizeof(root));
break;
case 'd':
debug = 1;
break;
case 'h':
printf("Usage: fstab_id [OPTIONS] name [...]\n"
" --export print environment keys\n"
" --root device node root (default /dev)\n"
" --debug debug to stderr\n"
" --help print this help text\n\n");
default:
rc = 1;
goto exit;
}
}
devices = &argv[optind];
if (devices[0] == NULL) {
fprintf(stderr, "error: missing device(s) to match\n");
rc = 2;
goto exit;
}
fp = setmntent ("/etc/fstab", "r");
if (fp == NULL) {
fprintf(stderr, "error: opening fstab: %s\n", strerror(errno));
rc = 2;
goto exit;
}
while (1) {
mnt = getmntent(fp);
if (mnt == NULL)
break;
/* skip root device */
if (strcmp(mnt->mnt_dir, "/") == 0)
continue;
/* match LABEL */
if (strncmp(mnt->mnt_fsname, "LABEL=", 6) == 0) {
const char *label;
char str[256];
label = &mnt->mnt_fsname[6];
if (label[0] == '"' || label[0] == '\'') {
char *pos;
strlcpy(str, &label[1], sizeof(str));
pos = strrchr(str, label[0]);
if (pos == NULL)
continue;
pos[0] = '\0';
label = str;
}
if (matches_device_list(str)) {
print_fstab_entry(mnt);
break;
}
continue;
}
/* match UUID */
if (strncmp(mnt->mnt_fsname, "UUID=", 5) == 0) {
const char *uuid;
char str[256];
uuid = &mnt->mnt_fsname[5];
if (uuid[0] == '"' || uuid[0] == '\'') {
char *pos;
strlcpy(str, &uuid[1], sizeof(str));
pos = strrchr(str, uuid[0]);
if (pos == NULL)
continue;
pos[0] = '\0';
uuid = str;
}
if (matches_device_list(str)) {
print_fstab_entry(mnt);
break;
}
continue;
}
/* only devices */
if (strncmp(mnt->mnt_fsname, root, strlen(root)) != 0)
continue;
if (matches_device_list(&mnt->mnt_fsname[strlen(root)+1])) {
print_fstab_entry(mnt);
break;
}
}
endmntent(fp);
exit:
logging_close();
return rc;
}
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