diff options
Diffstat (limited to 'extras/fstab_import/fstab_import.c')
| -rw-r--r-- | extras/fstab_import/fstab_import.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/extras/fstab_import/fstab_import.c b/extras/fstab_import/fstab_import.c new file mode 100644 index 0000000000..a8de067b38 --- /dev/null +++ b/extras/fstab_import/fstab_import.c @@ -0,0 +1,213 @@ +/* + * 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.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; +} |