chiark / gitweb /
usb_id: append target:lun to storage device serial
authorKay Sievers <kay.sievers@vrfy.org>
Wed, 21 Mar 2007 12:55:48 +0000 (13:55 +0100)
committerKay Sievers <kay.sievers@vrfy.org>
Wed, 21 Mar 2007 12:55:48 +0000 (13:55 +0100)
Some broken usb-storage devices implement multiple
luns with all the same SCSI identifiers. Append the
target:lun to get unique names in /dev/disk/by-id/.

extras/usb_id/usb_id.c

index ba8bfdf..50918f0 100644 (file)
@@ -20,6 +20,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
+#include <getopt.h>
 
 #include "../../udev.h"
 
@@ -55,12 +56,12 @@ void log_message(int priority, const char *format, ...)
 static char vendor_str[64];
 static char model_str[64];
 static char serial_str[MAX_SERIAL_LEN];
-static char revision_str[16];
-static char type_str[16];
+static char revision_str[64];
+static char type_str[64];
+static char instance_str[64];
 
 static int use_usb_info;
 static int use_num_info;
-static int export;
 
 static void set_str(char *to, const char *from, size_t count)
 {
@@ -115,7 +116,7 @@ static void set_usb_iftype(char *to, int if_class_num, size_t len)
                type = "printer";
                break;
        case 8:
-               type = "disk";
+               type = "storage";
                break;
        case 2: /* CDC-Control */
        case 5: /* Physical */
@@ -164,48 +165,40 @@ static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len
                        break;
                }
        }
-       strncpy(to, type, len);
-       to[len-1] = '\0';
+       strlcpy(to, type, len);
 
        return type_num;
 }
 
-static void set_scsi_type(char *to, const char *from, int count)
+static void set_scsi_type(char *to, const char *from, size_t len)
 {
        int type_num;
        char *eptr;
+       char *type = "generic";
 
        type_num = strtoul(from, &eptr, 0);
        if (eptr != from) {
                switch (type_num) {
                case 0:
-                       sprintf(to, "disk");
+               case 0xe:
+                       type = "disk";
                        break;
                case 1:
-                       sprintf(to, "tape");
+                       type = "tape";
                        break;
                case 4:
-                       sprintf(to, "optical");
-                       break;
-               case 5:
-                       sprintf(to, "cd");
-                       break;
                case 7:
-                       sprintf(to, "optical");
-                       break;
-               case 0xe:
-                       sprintf(to, "disk");
-                       break;
                case 0xf:
-                       sprintf(to, "optical");
+                       type = "optical";
+                       break;
+               case 5:
+                       type = "cd";
                        break;
                default:
-                       sprintf(to, "generic");
                        break;
                }
-       } else {
-               sprintf(to, "generic");
        }
+       strlcpy(to, type, len);
 }
 
 /*
@@ -278,6 +271,7 @@ static int usb_id(const char *devpath)
        /* mass storage */
        if (protocol == 6 && !use_usb_info) {
                struct sysfs_device *dev_scsi;
+               int host, bus, target, lun;
 
                /* get scsi device */
                dev_scsi = sysfs_device_get_parent_with_subsystem(dev, "scsi");
@@ -285,6 +279,10 @@ static int usb_id(const char *devpath)
                        info("unable to find parent 'scsi' device of '%s'", devpath);
                        goto fallback;
                }
+               if (sscanf(dev_scsi->kernel, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
+                       info("invalid scsi device '%s'", dev_scsi->kernel);
+                       goto fallback;
+               }
 
                /* Generic SPC-2 device */
                scsi_vendor = sysfs_attr_get_value(dev_scsi->devpath, "vendor");
@@ -314,6 +312,12 @@ static int usb_id(const char *devpath)
                        goto fallback;
                }
                set_str(revision_str, scsi_rev, sizeof(revision_str)-1);
+
+               /*
+                * some broken devices have the same identifiers
+                * for all luns, export the target:lun number
+                */
+               sprintf(instance_str, "%d:%d", target, lun);
        }
 
 fallback:
@@ -363,18 +367,25 @@ int main(int argc, char **argv)
        int retval = 0;
        const char *env;
        char devpath[MAX_PATH_LEN];
-       int option;
+       static int export;
 
        logging_init("usb_id");
        sysfs_init();
 
-       dbg("argc is %d", argc);
+       static const struct option options[] = {
+               { "usb-info", 0, NULL, 'u' },
+               { "num-info", 0, NULL, 'n' },
+               { "export", 0, NULL, 'x' },
+               { "help", 0, NULL, 'h' },
+               {}
+       };
 
-       while ((option = getopt(argc, argv, "dnux")) != -1 ) {
-               if (optarg)
-                       dbg("option '%c' arg '%s'", option, optarg);
-               else
-                       dbg("option '%c'", option);
+       while (1) {
+               int option;
+
+               option = getopt_long(argc, argv, "nuxh", options, NULL);
+               if (option == -1)
+                       break;
 
                switch (option) {
                case 'n':
@@ -387,10 +398,15 @@ int main(int argc, char **argv)
                case 'x':
                        export = 1;
                        break;
+               case 'h':
+                       printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help]\n"
+                              "  --usb-info  use usb strings instead\n"
+                              "  --num-info  use numerical values\n"
+                              "  --export    print values as environemt keys\n"
+                              "  --help      print this help text\n\n");
                default:
-                       info("Unknown or bad option '%c' (0x%x)", option, option);
                        retval = 1;
-                       break;
+                       goto exit;
                }
        }
 
@@ -398,7 +414,7 @@ int main(int argc, char **argv)
        if (env != NULL)
                strlcpy(devpath, env, sizeof(devpath));
        else {
-               if (optind == argc) {
+               if (argv[optind] == NULL) {
                        fprintf(stderr, "No device specified\n");
                        retval = 1;
                        goto exit;
@@ -409,28 +425,33 @@ int main(int argc, char **argv)
        retval = usb_id(devpath);
 
        if (retval == 0) {
+               char serial[256];
+
+               strlcpy(serial, vendor_str, sizeof(serial));
+               strlcat(serial, "_", sizeof(serial));
+               strlcat(serial, model_str, sizeof(serial));
+               if (serial_str[0] != '\0') {
+                       strlcat(serial, "_", sizeof(serial));
+                       strlcat(serial, serial_str, sizeof(serial));
+               }
+               if (instance_str[0] != '\0') {
+                       strlcat(serial, "-", sizeof(serial));
+                       strlcat(serial, instance_str, sizeof(serial));
+               }
+
                if (export) {
                        printf("ID_VENDOR=%s\n", vendor_str);
                        printf("ID_MODEL=%s\n", model_str);
                        printf("ID_REVISION=%s\n", revision_str);
-                       if (serial_str[0] == '\0') {
-                               printf("ID_SERIAL=%s_%s\n", 
-                                      vendor_str, model_str);
-                       } else {
-                               printf("ID_SERIAL=%s_%s_%s\n", 
-                                      vendor_str, model_str, serial_str);
-                       }
+                       printf("ID_SERIAL=%s\n", serial);
+                       if (serial_str[0] != '\0')
+                               printf("ID_SERIAL_SHORT=%s\n", serial_str);
                        printf("ID_TYPE=%s\n", type_str);
+                       if (instance_str[0] != '\0')
+                               printf("ID_INSTANCE=%s\n", instance_str);
                        printf("ID_BUS=usb\n");
-               } else {
-                       if (serial_str[0] == '\0') {
-                               printf("%s_%s\n", 
-                                      vendor_str, model_str);
-                       } else {
-                               printf("%s_%s_%s\n", 
-                                      vendor_str, model_str, serial_str);
-                       }
-               }
+               } else
+                       printf("%s\n", serial);
        }
 
 exit: