2 This file is part of systemd.
4 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
31 #include "libudev-private.h"
33 static void udev_device_tag(struct udev_device *dev, const char *tag, bool add)
36 char filename[UTIL_PATH_SIZE];
38 id = udev_device_get_id_filename(dev);
41 strscpyl(filename, sizeof(filename), "/run/udev/tags/", tag, "/", id, NULL);
46 mkdir_parents(filename, 0755);
47 fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
55 int udev_device_tag_index(struct udev_device *dev, struct udev_device *dev_old, bool add)
57 struct udev_list_entry *list_entry;
60 if (add && dev_old != NULL) {
61 /* delete possible left-over tags */
62 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev_old)) {
63 const char *tag_old = udev_list_entry_get_name(list_entry);
64 struct udev_list_entry *list_entry_current;
67 udev_list_entry_foreach(list_entry_current, udev_device_get_tags_list_entry(dev)) {
68 const char *tag = udev_list_entry_get_name(list_entry_current);
70 if (streq(tag, tag_old)) {
76 udev_device_tag(dev_old, tag_old, false);
80 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(dev))
81 udev_device_tag(dev, udev_list_entry_get_name(list_entry), add);
86 static bool device_has_info(struct udev_device *udev_device)
88 struct udev_list_entry *list_entry;
90 if (udev_device_get_devlinks_list_entry(udev_device) != NULL)
92 if (udev_device_get_devlink_priority(udev_device) != 0)
94 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
95 if (udev_list_entry_get_num(list_entry))
97 if (udev_device_get_tags_list_entry(udev_device) != NULL)
99 if (udev_device_get_watch_handle(udev_device) >= 0)
104 int udev_device_update_db(struct udev_device *udev_device)
106 struct udev *udev = udev_device_get_udev(udev_device);
109 char filename[UTIL_PATH_SIZE];
110 char filename_tmp[UTIL_PATH_SIZE];
114 id = udev_device_get_id_filename(udev_device);
118 has_info = device_has_info(udev_device);
119 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);
121 /* do not store anything for otherwise empty devices */
123 major(udev_device_get_devnum(udev_device)) == 0 &&
124 udev_device_get_ifindex(udev_device) == 0) {
129 /* write a database file */
130 strscpyl(filename_tmp, sizeof(filename_tmp), filename, ".tmp", NULL);
131 mkdir_parents(filename_tmp, 0755);
132 f = fopen(filename_tmp, "we");
134 udev_err(udev, "unable to create temporary db file '%s': %m\n", filename_tmp);
139 * set 'sticky' bit to indicate that we should not clean the
140 * database when we transition from initramfs to the real root
142 if (udev_device_get_db_persist(udev_device))
143 fchmod(fileno(f), 01644);
146 struct udev_list_entry *list_entry;
148 if (major(udev_device_get_devnum(udev_device)) > 0) {
149 udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
150 fprintf(f, "S:%s\n", udev_list_entry_get_name(list_entry) + strlen("/dev/"));
151 if (udev_device_get_devlink_priority(udev_device) != 0)
152 fprintf(f, "L:%i\n", udev_device_get_devlink_priority(udev_device));
153 if (udev_device_get_watch_handle(udev_device) >= 0)
154 fprintf(f, "W:%i\n", udev_device_get_watch_handle(udev_device));
157 if (udev_device_get_usec_initialized(udev_device) > 0)
158 fprintf(f, "I:%llu\n", (unsigned long long)udev_device_get_usec_initialized(udev_device));
160 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
161 if (!udev_list_entry_get_num(list_entry))
163 fprintf(f, "E:%s=%s\n",
164 udev_list_entry_get_name(list_entry),
165 udev_list_entry_get_value(list_entry));
168 udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
169 fprintf(f, "G:%s\n", udev_list_entry_get_name(list_entry));
173 r = rename(filename_tmp, filename);
176 udev_dbg(udev, "created %s file '%s' for '%s'\n", has_info ? "db" : "empty",
177 filename, udev_device_get_devpath(udev_device));
181 int udev_device_delete_db(struct udev_device *udev_device)
184 char filename[UTIL_PATH_SIZE];
186 id = udev_device_get_id_filename(udev_device);
189 strscpyl(filename, sizeof(filename), "/run/udev/data/", id, NULL);