diff options
Diffstat (limited to 'extras/volume_id/vol_id.c')
| -rw-r--r-- | extras/volume_id/vol_id.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/extras/volume_id/vol_id.c b/extras/volume_id/vol_id.c new file mode 100644 index 0000000000..3048fd8062 --- /dev/null +++ b/extras/volume_id/vol_id.c @@ -0,0 +1,198 @@ +/* + * udev_volume_id - udev callout to read filesystem label and uuid + * + * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org> + * + * sample udev rule for creation of a symlink with the filsystem uuid: + * KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -u %N", SYMLINK="%c" + * + * 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 version 2 of the License. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE 1 +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> +#include <sys/ioctl.h> + +#include "../../udev_utils.h" +#include "../../logging.h" +#include "volume_id/volume_id.h" +#include "volume_id/dasd.h" + +#define BLKGETSIZE64 _IOR(0x12,114,size_t) + +#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 (priority > udev_log) + return; + + va_start(args, format); + vsyslog(priority, format, args); + va_end(args); +} +#endif + +static void set_str(char *to, const unsigned char *from, int count) +{ + int i, j; + int len; + + len = strnlen(from, count); + while (isspace(from[len-1])) + len--; + + i = 0; + while (isspace(from[i]) && (i < len)) + i++; + + j = 0; + while (i < len) { + switch(from[i]) { + case '/': + break; + case ' ': + to[j++] = '_'; + break; + default: + to[j++] = from[i]; + } + i++; + } + to[j] = '\0'; +} + +int main(int argc, char *argv[]) +{ + const char help[] = "usage: udev_volume_id [--export|-t|-l|-u] <device>\n" + " --export\n" + " -t filesystem type\n" + " -l filesystem label\n" + " -u filesystem uuid\n" + "\n"; + enum print_type { + PRINT_EXPORT, + PRINT_TYPE, + PRINT_LABEL, + PRINT_UUID, + } print = PRINT_EXPORT; + struct volume_id *vid = NULL; + static char name[VOLUME_ID_LABEL_SIZE]; + int i; + unsigned long long size; + const char *node = NULL; + int rc = 0; + + logging_init("udev_volume_id"); + + for (i = 1 ; i < argc; i++) { + char *arg = argv[i]; + + if (strcmp(arg, "--export") == 0) { + print = PRINT_EXPORT; + } else if (strcmp(arg, "-t") == 0) { + print = PRINT_TYPE; + } else if (strcmp(arg, "-l") == 0) { + print = PRINT_LABEL; + } else if (strcmp(arg, "-u") == 0) { + print = PRINT_UUID; + } else + node = arg; + } + if (!node) { + err("no node specified"); + fprintf(stderr, help); + rc = 1; + goto exit; + } + + vid = volume_id_open_node(node); + if (vid == NULL) { + fprintf(stderr, "error open volume\n"); + rc = 2; + goto exit; + } + + if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0) + size = 0; + + if (volume_id_probe_all(vid, 0, size) == 0) + goto print; + + if (volume_id_probe_dasd(vid) == 0) + goto print; + + fprintf(stderr, "unknown volume type\n"); + rc = 3; + goto exit; + +print: + set_str(name, vid->label, sizeof(vid->label)); + + switch (print) { + case PRINT_EXPORT: + printf("ID_FS_USAGE=%s\n", vid->usage); + printf("ID_FS_TYPE=%s\n", vid->type); + printf("ID_FS_VERSION=%s\n", vid->type_version); + printf("ID_FS_UUID=%s\n", vid->uuid); + printf("ID_FS_LABEL=%s\n", vid->label); + printf("ID_FS_LABEL_SAFE=%s\n", name); + break; + case PRINT_TYPE: + printf("%s\n", vid->type); + break; + case PRINT_LABEL: + if (name[0] == '\0' || + (vid->usage_id != VOLUME_ID_FILESYSTEM && vid->usage_id != VOLUME_ID_DISKLABEL)) { + rc = 3; + goto exit; + } + printf("%s\n", name); + break; + case PRINT_UUID: + if (vid->uuid[0] == '\0' || vid->usage_id != VOLUME_ID_FILESYSTEM) { + rc = 4; + goto exit; + } + printf("%s\n", vid->uuid); + break; + } + +exit: + if (vid != NULL) + volume_id_close(vid); + + logging_close(); + return rc; +} |