mirror of
https://github.com/systemd/systemd.git
synced 2024-11-14 15:21:37 +03:00
84b6ad702e
Based on a patch by Kay Sievers. A tag is exported at boot as a symlinks to the device node in the folder /run/udev/static_node-tags/<tagname>/, if the device node exists. These tags are cleaned up by udevadm info --cleanup-db, but are otherwise never removed.
551 lines
20 KiB
C
551 lines
20 KiB
C
/*
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* Copyright (C) 2004-2009 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "udev.h"
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static bool skip_attribute(const char *name)
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{
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static const char* const skip[] = {
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"uevent",
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"dev",
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"modalias",
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"resource",
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"driver",
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"subsystem",
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"module",
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};
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unsigned int i;
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for (i = 0; i < ELEMENTSOF(skip); i++)
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if (streq(name, skip[i]))
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return true;
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return false;
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}
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static void print_all_attributes(struct udev_device *device, const char *key)
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{
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struct udev_list_entry *sysattr;
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udev_list_entry_foreach(sysattr, udev_device_get_sysattr_list_entry(device)) {
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const char *name;
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const char *value;
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size_t len;
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name = udev_list_entry_get_name(sysattr);
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if (skip_attribute(name))
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continue;
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value = udev_device_get_sysattr_value(device, name);
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if (value == NULL)
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continue;
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/* skip any values that look like a path */
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if (value[0] == '/')
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continue;
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/* skip nonprintable attributes */
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len = strlen(value);
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while (len > 0 && isprint(value[len-1]))
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len--;
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if (len > 0)
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continue;
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printf(" %s{%s}==\"%s\"\n", key, name, value);
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}
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printf("\n");
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}
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static int print_device_chain(struct udev_device *device)
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{
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struct udev_device *device_parent;
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const char *str;
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printf("\n"
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"Udevadm info starts with the device specified by the devpath and then\n"
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"walks up the chain of parent devices. It prints for every device\n"
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"found, all possible attributes in the udev rules key format.\n"
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"A rule to match, can be composed by the attributes of the device\n"
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"and the attributes from one single parent device.\n"
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"\n");
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printf(" looking at device '%s':\n", udev_device_get_devpath(device));
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printf(" KERNEL==\"%s\"\n", udev_device_get_sysname(device));
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str = udev_device_get_subsystem(device);
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if (str == NULL)
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str = "";
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printf(" SUBSYSTEM==\"%s\"\n", str);
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str = udev_device_get_driver(device);
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if (str == NULL)
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str = "";
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printf(" DRIVER==\"%s\"\n", str);
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print_all_attributes(device, "ATTR");
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device_parent = device;
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do {
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device_parent = udev_device_get_parent(device_parent);
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if (device_parent == NULL)
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break;
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printf(" looking at parent device '%s':\n", udev_device_get_devpath(device_parent));
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printf(" KERNELS==\"%s\"\n", udev_device_get_sysname(device_parent));
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str = udev_device_get_subsystem(device_parent);
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if (str == NULL)
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str = "";
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printf(" SUBSYSTEMS==\"%s\"\n", str);
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str = udev_device_get_driver(device_parent);
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if (str == NULL)
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str = "";
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printf(" DRIVERS==\"%s\"\n", str);
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print_all_attributes(device_parent, "ATTRS");
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} while (device_parent != NULL);
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return 0;
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}
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static void print_record(struct udev_device *device)
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{
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const char *str;
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int i;
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struct udev_list_entry *list_entry;
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printf("P: %s\n", udev_device_get_devpath(device));
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str = udev_device_get_devnode(device);
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if (str != NULL)
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printf("N: %s\n", str + strlen("/dev/"));
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i = udev_device_get_devlink_priority(device);
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if (i != 0)
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printf("L: %i\n", i);
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udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device))
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printf("S: %s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/"));
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udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
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printf("E: %s=%s\n",
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udev_list_entry_get_name(list_entry),
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udev_list_entry_get_value(list_entry));
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printf("\n");
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}
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static int stat_device(const char *name, bool export, const char *prefix)
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{
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struct stat statbuf;
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if (stat(name, &statbuf) != 0)
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return -1;
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if (export) {
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if (prefix == NULL)
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prefix = "INFO_";
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printf("%sMAJOR=%d\n"
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"%sMINOR=%d\n",
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prefix, major(statbuf.st_dev),
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prefix, minor(statbuf.st_dev));
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} else
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printf("%d:%d\n", major(statbuf.st_dev), minor(statbuf.st_dev));
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return 0;
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}
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static int export_devices(struct udev *udev)
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{
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struct udev_enumerate *udev_enumerate;
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struct udev_list_entry *list_entry;
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udev_enumerate = udev_enumerate_new(udev);
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if (udev_enumerate == NULL)
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return -1;
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udev_enumerate_scan_devices(udev_enumerate);
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udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
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struct udev_device *device;
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device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
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if (device != NULL) {
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print_record(device);
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udev_device_unref(device);
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}
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}
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udev_enumerate_unref(udev_enumerate);
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return 0;
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}
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static void cleanup_dir(DIR *dir, mode_t mask, int depth)
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{
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struct dirent *dent;
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if (depth <= 0)
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return;
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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struct stat stats;
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if (dent->d_name[0] == '.')
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continue;
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if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
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continue;
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if ((stats.st_mode & mask) != 0)
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continue;
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if (S_ISDIR(stats.st_mode)) {
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DIR *dir2;
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dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
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if (dir2 != NULL) {
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cleanup_dir(dir2, mask, depth-1);
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closedir(dir2);
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}
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unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR);
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} else {
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unlinkat(dirfd(dir), dent->d_name, 0);
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}
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}
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}
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static void cleanup_db(struct udev *udev)
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{
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DIR *dir;
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unlink("/run/udev/queue.bin");
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dir = opendir("/run/udev/data");
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if (dir != NULL) {
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cleanup_dir(dir, S_ISVTX, 1);
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closedir(dir);
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}
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dir = opendir("/run/udev/links");
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if (dir != NULL) {
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cleanup_dir(dir, 0, 2);
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closedir(dir);
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}
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dir = opendir("/run/udev/tags");
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if (dir != NULL) {
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cleanup_dir(dir, 0, 2);
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closedir(dir);
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}
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dir = opendir("/run/udev/static_node-tags");
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if (dir != NULL) {
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cleanup_dir(dir, 0, 2);
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closedir(dir);
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}
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dir = opendir("/run/udev/watch");
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if (dir != NULL) {
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cleanup_dir(dir, 0, 1);
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closedir(dir);
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}
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}
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static struct udev_device *find_device(struct udev *udev, const char *id, const char *prefix)
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{
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char name[UTIL_PATH_SIZE];
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if (prefix && !startswith(id, prefix)) {
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strscpyl(name, sizeof(name), prefix, id, NULL);
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id = name;
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}
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if (startswith(id, "/dev/")) {
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struct stat statbuf;
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char type;
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if (stat(id, &statbuf) < 0)
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return NULL;
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if (S_ISBLK(statbuf.st_mode))
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type = 'b';
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else if (S_ISCHR(statbuf.st_mode))
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type = 'c';
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else
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return NULL;
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return udev_device_new_from_devnum(udev, type, statbuf.st_rdev);
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} else if (startswith(id, "/sys/"))
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return udev_device_new_from_syspath(udev, id);
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else
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return NULL;
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}
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static int uinfo(struct udev *udev, int argc, char *argv[])
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{
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struct udev_device *device = NULL;
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bool root = 0;
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bool export = 0;
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const char *export_prefix = NULL;
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char name[UTIL_PATH_SIZE];
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struct udev_list_entry *list_entry;
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int rc = 0;
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static const struct option options[] = {
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{ "name", required_argument, NULL, 'n' },
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{ "path", required_argument, NULL, 'p' },
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{ "query", required_argument, NULL, 'q' },
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{ "attribute-walk", no_argument, NULL, 'a' },
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{ "cleanup-db", no_argument, NULL, 'c' },
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{ "export-db", no_argument, NULL, 'e' },
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{ "root", no_argument, NULL, 'r' },
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{ "device-id-of-file", required_argument, NULL, 'd' },
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{ "export", no_argument, NULL, 'x' },
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{ "export-prefix", required_argument, NULL, 'P' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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static const char *usage =
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"Usage: udevadm info OPTIONS\n"
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" --query=<type> query device information:\n"
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" name name of device node\n"
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" symlink pointing to node\n"
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" path sys device path\n"
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" property the device properties\n"
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" all all values\n"
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" --path=<syspath> sys device path used for query or attribute walk\n"
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" --name=<name> node or symlink name used for query or attribute walk\n"
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" --root prepend dev directory to path names\n"
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" --attribute-walk print all key matches while walking along the chain\n"
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" of parent devices\n"
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" --device-id-of-file=<file> print major:minor of device containing this file\n"
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" --export export key/value pairs\n"
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" --export-prefix export the key name with a prefix\n"
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" --export-db export the content of the udev database\n"
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" --cleanup-db cleanup the udev database\n"
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" --help\n";
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enum action_type {
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ACTION_QUERY,
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ACTION_ATTRIBUTE_WALK,
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ACTION_DEVICE_ID_FILE,
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} action = ACTION_QUERY;
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enum query_type {
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QUERY_NAME,
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QUERY_PATH,
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QUERY_SYMLINK,
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QUERY_PROPERTY,
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QUERY_ALL,
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} query = QUERY_ALL;
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for (;;) {
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int option;
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option = getopt_long(argc, argv, "aced:n:p:q:rxP:RVh", options, NULL);
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if (option == -1)
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break;
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switch (option) {
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case 'n': {
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if (device != NULL) {
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fprintf(stderr, "device already specified\n");
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rc = 2;
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goto exit;
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}
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device = find_device(udev, optarg, "/dev/");
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if (device == NULL) {
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fprintf(stderr, "device node not found\n");
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rc = 2;
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goto exit;
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}
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break;
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}
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case 'p':
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if (device != NULL) {
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fprintf(stderr, "device already specified\n");
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rc = 2;
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goto exit;
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}
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device = find_device(udev, optarg, "/sys");
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if (device == NULL) {
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fprintf(stderr, "syspath not found\n");
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rc = 2;
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goto exit;
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}
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break;
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case 'q':
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action = ACTION_QUERY;
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if (streq(optarg, "property") || streq(optarg, "env")) {
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query = QUERY_PROPERTY;
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} else if (streq(optarg, "name")) {
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query = QUERY_NAME;
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} else if (streq(optarg, "symlink")) {
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query = QUERY_SYMLINK;
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} else if (streq(optarg, "path")) {
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query = QUERY_PATH;
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} else if (streq(optarg, "all")) {
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query = QUERY_ALL;
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} else {
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fprintf(stderr, "unknown query type\n");
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rc = 3;
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goto exit;
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}
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break;
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case 'r':
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root = true;
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break;
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case 'd':
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action = ACTION_DEVICE_ID_FILE;
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strscpy(name, sizeof(name), optarg);
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break;
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case 'a':
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action = ACTION_ATTRIBUTE_WALK;
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break;
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case 'e':
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export_devices(udev);
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goto exit;
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case 'c':
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cleanup_db(udev);
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goto exit;
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case 'x':
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export = true;
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break;
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case 'P':
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export_prefix = optarg;
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break;
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case 'V':
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printf("%s\n", VERSION);
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goto exit;
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case 'h':
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printf("%s\n", usage);
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goto exit;
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default:
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rc = 1;
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goto exit;
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}
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}
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switch (action) {
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case ACTION_QUERY:
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if (!device) {
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if (!argv[optind]) {
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fprintf(stderr, "%s\n", usage);
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rc = 2;
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goto exit;
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}
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device = find_device(udev, argv[optind], NULL);
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if (!device) {
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fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n");
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rc = 4;
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goto exit;
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}
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}
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switch(query) {
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case QUERY_NAME: {
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const char *node = udev_device_get_devnode(device);
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if (node == NULL) {
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fprintf(stderr, "no device node found\n");
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rc = 5;
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goto exit;
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}
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if (root)
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printf("%s\n", udev_device_get_devnode(device));
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else
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printf("%s\n", udev_device_get_devnode(device) + strlen("/dev/"));
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break;
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}
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case QUERY_SYMLINK:
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list_entry = udev_device_get_devlinks_list_entry(device);
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while (list_entry != NULL) {
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if (root)
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printf("%s", udev_list_entry_get_name(list_entry));
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else
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printf("%s", udev_list_entry_get_name(list_entry) + strlen("/dev/"));
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list_entry = udev_list_entry_get_next(list_entry);
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if (list_entry != NULL)
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printf(" ");
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}
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printf("\n");
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break;
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case QUERY_PATH:
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printf("%s\n", udev_device_get_devpath(device));
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goto exit;
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case QUERY_PROPERTY:
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list_entry = udev_device_get_properties_list_entry(device);
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while (list_entry != NULL) {
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if (export) {
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const char *prefix = export_prefix;
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if (prefix == NULL)
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prefix = "";
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printf("%s%s='%s'\n", prefix,
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udev_list_entry_get_name(list_entry),
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udev_list_entry_get_value(list_entry));
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} else {
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printf("%s=%s\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));
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}
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list_entry = udev_list_entry_get_next(list_entry);
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}
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break;
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case QUERY_ALL:
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print_record(device);
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break;
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default:
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fprintf(stderr, "unknown query type\n");
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break;
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}
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break;
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case ACTION_ATTRIBUTE_WALK:
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if (!device && argv[optind]) {
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|
device = find_device(udev, argv[optind], NULL);
|
|
if (!device) {
|
|
fprintf(stderr, "Unknown device, absolute path in /dev/ or /sys expected.\n");
|
|
rc = 4;
|
|
goto exit;
|
|
}
|
|
}
|
|
if (!device) {
|
|
fprintf(stderr, "Unknown device, --name=, --path=, or absolute path in /dev/ or /sys expected.\n");
|
|
rc = 4;
|
|
goto exit;
|
|
}
|
|
print_device_chain(device);
|
|
break;
|
|
case ACTION_DEVICE_ID_FILE:
|
|
if (stat_device(name, export, export_prefix) != 0)
|
|
rc = 1;
|
|
break;
|
|
}
|
|
|
|
exit:
|
|
udev_device_unref(device);
|
|
return rc;
|
|
}
|
|
|
|
const struct udevadm_cmd udevadm_info = {
|
|
.name = "info",
|
|
.cmd = uinfo,
|
|
.help = "query sysfs or the udev database",
|
|
};
|