chiark / gitweb /
libudev: allow to store negative values in the udev database
[elogind.git] / extras / path_id / path_id.c
index 872f0c9..dcee378 100644 (file)
@@ -1,8 +1,10 @@
 /*
- * compose persisistent device path
+ * compose persistent device path
  *
  * Copyright (C) 2009 Kay Sievers <kay.sievers@vrfy.org>
  *
+ * Logic based on Hannes Reinecke's shell script.
+ *
  * 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
 #include <dirent.h>
 #include <getopt.h>
 
-#include <libudev.h>
-#include <../../udev/udev.h>
+#include "libudev.h"
+#include "libudev-private.h"
 
-int debug;
+static int debug;
 
 static void log_fn(struct udev *udev, int priority,
                   const char *file, int line, const char *fn,
@@ -89,29 +91,131 @@ static struct udev_device *skip_subsystem(struct udev_device *dev, const char *s
        return dev;
 }
 
-/* find smallest number of instances of <syspath>/<name><number> */
-static int base_number(const char *syspath, const char *name)
+static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path)
+{
+       struct udev *udev  = udev_device_get_udev(parent);
+       struct udev_device *targetdev;
+       struct udev_device *fcdev = NULL;
+       const char *port;
+       unsigned int lun;
+
+       targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
+       if (targetdev == NULL)
+               return NULL;
+
+       fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
+       if (fcdev == NULL)
+               return NULL;
+       port = udev_device_get_sysattr_value(fcdev, "port_name");
+       if (port == NULL) {
+               parent = NULL;
+               goto out;
+       }
+
+       lun = strtoul(udev_device_get_sysnum(parent), NULL, 10);
+       path_prepend(path, "fc-%s:0x%04x%04x00000000", port, lun & 0xffff, (lun >> 16) & 0xffff);
+out:
+       udev_device_unref(fcdev);
+       return parent;
+}
+
+static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
+{
+       return NULL;
+}
+
+static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path)
 {
+       struct udev *udev  = udev_device_get_udev(parent);
+       struct udev_device *transportdev;
+       struct udev_device *sessiondev = NULL;
+       const char *target;
+       char *connname;
+       struct udev_device *conndev = NULL;
+       const char *addr;
+       const char *port;
+
+       /* find iscsi session */
+       transportdev = parent;
+       while (1) {
+               transportdev = udev_device_get_parent(transportdev);
+               if (transportdev == NULL)
+                       return NULL;
+               if (strncmp(udev_device_get_sysname(transportdev), "session", 7) == 0)
+                       break;
+       }
+       if (transportdev == NULL)
+               return NULL;
+
+       /* find iscsi session device */
+       sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
+       if (sessiondev == NULL)
+               return NULL;
+       target = udev_device_get_sysattr_value(sessiondev, "targetname");
+       if (target == NULL) {
+               parent = NULL;
+               goto out;
+       }
+
+       if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) {
+               parent = NULL;
+               goto out;
+       }
+       conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
+       free(connname);
+       if (conndev == NULL) {
+               parent = NULL;
+               goto out;
+       }
+       addr = udev_device_get_sysattr_value(conndev, "persistent_address");
+       port = udev_device_get_sysattr_value(conndev, "persistent_port");
+       if (addr == NULL || port == NULL) {
+               parent = NULL;
+               goto out;
+       }
+
+       path_prepend(path, "ip-%s:%s-iscsi-%s-lun-%s", addr, port, target, udev_device_get_sysnum(parent));
+out:
+       udev_device_unref(sessiondev);
+       udev_device_unref(conndev);
+       return parent;
+}
+
+static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path)
+{
+       struct udev_device *hostdev;
+       int host, bus, target, lun;
+       const char *name;
        char *base;
        char *pos;
        DIR *dir;
        struct dirent *dent;
-       size_t len;
-       int number = -1;
+       int basenum;
 
-       base = strdup(syspath);
-       if (base == NULL)
-               goto out;
+       hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
+       if (hostdev == NULL)
+               return NULL;
+
+       name = udev_device_get_sysname(parent);
+       if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
+               return NULL;
 
+       /* rebase host offset to get the local relative number */
+       basenum = -1;
+       base = strdup(udev_device_get_syspath(hostdev));
+       if (base == NULL)
+               return NULL;
        pos = strrchr(base, '/');
-       if (pos == NULL)
+       if (pos == NULL) {
+               parent = NULL;
                goto out;
+       }
        pos[0] = '\0';
-
-       len = strlen(name);
        dir = opendir(base);
-       if (dir == NULL)
+       if (dir == NULL) {
+               parent = NULL;
                goto out;
+       }
        for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
                char *rest;
                int i;
@@ -120,49 +224,66 @@ static int base_number(const char *syspath, const char *name)
                        continue;
                if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
                        continue;
-               if (strncmp(dent->d_name, name, len) != 0)
+               if (strncmp(dent->d_name, "host", 4) != 0)
                        continue;
-               i = strtoul(&dent->d_name[len], &rest, 10);
+               i = strtoul(&dent->d_name[4], &rest, 10);
                if (rest[0] != '\0')
                        continue;
-               if (number == -1 || i < number)
-                       number = i;
+               if (basenum == -1 || i < basenum)
+                       basenum = i;
        }
        closedir(dir);
+       if (basenum == -1) {
+               parent = NULL;
+               goto out;
+       }
+       host -= basenum;
+
+       path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
 out:
        free(base);
-       return number;
+       return hostdev;
 }
 
-static struct udev_device *handle_scsi(struct udev_device *dev, char **path)
+static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
 {
        const char *devtype;
-       struct udev_device *hostdev;
        const char *name;
-       int host, bus, target, lun;
-       int base;
+       const char *id;
 
-       devtype = udev_device_get_devtype(dev);
+       devtype = udev_device_get_devtype(parent);
        if (devtype == NULL || strcmp(devtype, "scsi_device") != 0)
-               return dev;
+               return parent;
 
-       hostdev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_host");
-       if (hostdev == NULL)
-               return dev;
+       /* firewire */
+       id = udev_device_get_sysattr_value(parent, "ieee1394_id");
+       if (id != NULL) {
+               parent = skip_subsystem(parent, "scsi");
+               path_prepend(path, "ieee1394-0x%s", id);
+               goto out;
+       }
 
-       name = udev_device_get_sysname(dev);
-       if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
-               return dev;
+       /* lousy scsi sysfs does not have a "subsystem" for the transport */
+       name = udev_device_get_syspath(parent);
 
-       /* rebase host offset to get the local relative number */
-       base = base_number(udev_device_get_syspath(hostdev), "host");
-       if (base < 0)
-               return dev;
-       host -= base;
+       if (strstr(name, "/rport-") != NULL) {
+               parent = handle_scsi_fibre_channel(parent, path);
+               goto out;
+       }
 
-       path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
-       dev = skip_subsystem(dev, "scsi");
-       return dev;
+       if (strstr(name, "/end_device-") != NULL) {
+               parent = handle_scsi_sas(parent, path);
+               goto out;
+       }
+
+       if (strstr(name, "/session") != NULL) {
+               parent = handle_scsi_iscsi(parent, path);
+               goto out;
+       }
+
+       parent = handle_scsi_default(parent, path);
+out:
+       return parent;
 }
 
 static void handle_scsi_tape(struct udev_device *dev, char **suffix)
@@ -176,42 +297,30 @@ static void handle_scsi_tape(struct udev_device *dev, char **suffix)
                asprintf(suffix, "st%c", name[2]);
 }
 
-static struct udev_device *handle_usb(struct udev_device *dev, char **path)
+static struct udev_device *handle_usb(struct udev_device *parent, char **path)
 {
        const char *devtype;
        const char *str;
        const char *port;
 
-       devtype = udev_device_get_devtype(dev);
+       devtype = udev_device_get_devtype(parent);
        if (devtype == NULL || strcmp(devtype, "usb_interface") != 0)
-               return dev;
+               return parent;
 
-       str = udev_device_get_sysname(dev);
+       str = udev_device_get_sysname(parent);
        port = strchr(str, '-');
        if (port == NULL)
-               return dev;
+               return parent;
        port++;
 
-       dev = skip_subsystem(dev, "usb");
+       parent = skip_subsystem(parent, "usb");
        path_prepend(path, "usb-0:%s", port);
-       return dev;
+       return parent;
 }
 
-static struct udev_device *handle_firewire(struct udev_device *parent, struct udev_device *dev, char **path)
+static struct udev_device *handle_cciss(struct udev_device *parent, char **path)
 {
-       struct udev_device *scsi_dev;
-
-       scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
-       if (scsi_dev != NULL) {
-               const char *id;
-
-               id = udev_device_get_sysattr_value(scsi_dev, "ieee1394_id");
-               if (id != NULL)
-                       path_prepend(path, "ieee1394-0x%s", id);
-       }
-
-       parent = skip_subsystem(parent, "firewire");
-       return parent;
+       return NULL;
 }
 
 static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path)
@@ -259,7 +368,7 @@ int main(int argc, char **argv)
        if (udev == NULL)
                goto exit;
 
-       logging_init("usb_id");
+       udev_log_init("path_id");
        udev_set_log_fn(udev, log_fn);
 
        while (1) {
@@ -303,6 +412,14 @@ int main(int argc, char **argv)
        path = NULL;
        path_suffix = NULL;
 
+       /* S390 ccw bus */
+       parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
+       if (parent != NULL) {
+               handle_ccw(parent, dev, &path);
+               goto out;
+       }
+
+       /* walk up the chain of devices and compose path */
        parent = dev;
        while (parent != NULL) {
                const char *subsys;
@@ -315,23 +432,13 @@ int main(int argc, char **argv)
                        handle_scsi_tape(parent, &path_suffix);
                } else if (strcmp(subsys, "scsi") == 0) {
                        parent = handle_scsi(parent, &path);
-               } else if (strcmp(subsys, "fc_transport") == 0) {
-                       ; //handle_fc();
-               } else if (strcmp(subsys, "sas_end_device") == 0) {
-                       ; //handle_sas();
-               } else if (strcmp(subsys, "iscsi_session") == 0) {
-                       ; //handle_iscsi()
-               } else if (strcmp(subsys, "ccw") == 0) {
-                       handle_ccw(parent, dev, &path);
                } else if (strcmp(subsys, "cciss") == 0) {
-                       ; //handle_cciss();
+                       handle_cciss(parent, &path);
                } else if (strcmp(subsys, "usb") == 0) {
                        parent = handle_usb(parent, &path);
                } else if (strcmp(subsys, "serio") == 0) {
                        path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
                        parent = skip_subsystem(parent, "serio");
-               } else if (strcmp(subsys, "firewire") == 0 || strcmp(subsys, "ieee1394") == 0) {
-                       parent = handle_firewire(parent, dev, &path);
                } else if (strcmp(subsys, "pci") == 0) {
                        path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
                        parent = skip_subsystem(parent, "pci");
@@ -345,7 +452,7 @@ int main(int argc, char **argv)
 
                parent = udev_device_get_parent(parent);
        }
-
+out:
        if (path != NULL) {
                if (path_suffix != NULL) {
                        printf("ID_PATH=%s%s\n", path, path_suffix);
@@ -360,6 +467,6 @@ int main(int argc, char **argv)
        udev_device_unref(dev);
 exit:
        udev_unref(udev);
-       logging_close();
+       udev_log_close();
        return rc;
 }