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systemd-stable/udevtrigger.c
Kay Sievers c48622cc25 udevtrigger: trigger devices sorted by their dependency 
Resolve the links to the real device location in the tree, and
sort the list, to make sure that parent devices are triggered
before their childs.
2006-09-19 17:51:31 +02:00

525 lines
12 KiB
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/*
* Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
* Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <fnmatch.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "udev.h"
#include "udevd.h"
static int verbose;
static int dry_run;
LIST_HEAD(device_list);
LIST_HEAD(filter_subsystem_match_list);
LIST_HEAD(filter_subsystem_nomatch_list);
LIST_HEAD(filter_attr_match_list);
LIST_HEAD(filter_attr_nomatch_list);
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
if (priority > udev_log_priority)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
/* devices that should run last cause of their dependencies */
static int delay_device(const char *devpath)
{
static const char *delay_device_list[] = {
"*/md*",
"*/dm-*",
NULL
};
int i;
for (i = 0; delay_device_list[i] != NULL; i++)
if (fnmatch(delay_device_list[i], devpath, 0) == 0)
return 1;
return 0;
}
static int device_list_insert(const char *path)
{
char filename[PATH_SIZE];
char devpath[PATH_SIZE];
struct stat statbuf;
dbg("add '%s'" , path);
/* we only have a device, if we have an uevent file */
strlcpy(filename, path, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (stat(filename, &statbuf) < 0)
return -1;
if (!(statbuf.st_mode & S_IWUSR))
return -1;
strlcpy(devpath, &path[strlen(sysfs_path)], sizeof(devpath));
/* resolve possible link to real target */
if (lstat(path, &statbuf) < 0)
return -1;
if (S_ISLNK(statbuf.st_mode))
if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
return -1;
name_list_add(&device_list, devpath, 1);
return 0;
}
static void trigger_uevent(const char *devpath)
{
char filename[PATH_SIZE];
int fd;
strlcpy(filename, sysfs_path, sizeof(filename));
strlcat(filename, devpath, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (verbose)
printf("%s\n", devpath);
if (dry_run)
return;
fd = open(filename, O_WRONLY);
if (fd < 0) {
dbg("error on opening %s: %s\n", filename, strerror(errno));
return;
}
if (write(fd, "add", 3) < 0)
info("error on triggering %s: %s\n", filename, strerror(errno));
close(fd);
}
static void exec_list(void)
{
struct name_entry *loop_device;
struct name_entry *tmp_device;
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
if (delay_device(loop_device->name))
continue;
trigger_uevent(loop_device->name);
list_del(&loop_device->node);
free(loop_device);
}
/* trigger remaining delayed devices */
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
trigger_uevent(loop_device->name);
list_del(&loop_device->node);
free(loop_device);
}
}
static int subsystem_filtered(const char *subsystem)
{
struct name_entry *loop_name;
/* skip devices matching the listed subsystems */
list_for_each_entry(loop_name, &filter_subsystem_nomatch_list, node)
if (fnmatch(loop_name->name, subsystem, 0) == 0)
return 1;
/* skip devices not matching the listed subsystems */
if (!list_empty(&filter_subsystem_match_list)) {
list_for_each_entry(loop_name, &filter_subsystem_match_list, node)
if (fnmatch(loop_name->name, subsystem, 0) == 0)
return 0;
return 1;
}
return 0;
}
static int attr_match(const char *path, const char *attr_value)
{
char attr[NAME_SIZE];
char file[PATH_SIZE];
char *match_value;
strlcpy(attr, attr_value, sizeof(attr));
/* separate attr and match value */
match_value = strchr(attr, '=');
if (match_value != NULL) {
match_value[0] = '\0';
match_value = &match_value[1];
}
strlcpy(file, path, sizeof(file));
strlcat(file, "/", sizeof(file));
strlcat(file, attr, sizeof(file));
if (match_value != NULL) {
/* match file content */
char value[NAME_SIZE];
int fd;
ssize_t size;
fd = open(file, O_RDONLY);
if (fd < 0)
return 0;
size = read(fd, value, sizeof(value));
close(fd);
if (size < 0)
return 0;
value[size] = '\0';
remove_trailing_chars(value, '\n');
/* match if attribute value matches */
if (fnmatch(match_value, value, 0) == 0)
return 1;
} else {
/* match if attribute exists */
struct stat statbuf;
if (stat(file, &statbuf) == 0)
return 1;
}
return 0;
}
static int attr_filtered(const char *path)
{
struct name_entry *loop_name;
/* skip devices matching the listed sysfs attributes */
list_for_each_entry(loop_name, &filter_attr_nomatch_list, node)
if (attr_match(path, loop_name->name))
return 1;
/* skip devices not matching the listed sysfs attributes */
if (!list_empty(&filter_attr_match_list)) {
list_for_each_entry(loop_name, &filter_attr_match_list, node)
if (attr_match(path, loop_name->name))
return 0;
return 1;
}
return 0;
}
static void scan_bus(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/bus", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
if (subsystem_filtered(dent->d_name))
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
strlcat(dirname, "/devices", sizeof(dirname));
/* look for devices */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_block(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
struct stat statbuf;
/* skip if "block" is already a "class" */
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/class/block", sizeof(base));
if (stat(base, &statbuf) == 0)
return;
if (subsystem_filtered("block"))
return;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/block", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
if (attr_filtered(dirname))
continue;
if (device_list_insert(dirname) != 0);
continue;
/* look for partitions */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name,"device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_class(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/class", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
if (subsystem_filtered(dent->d_name))
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name, "device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_failed(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, udev_root, sizeof(base));
strlcat(base, "/" EVENT_FAILED_DIR, sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char device[PATH_SIZE];
size_t start, end, i;
if (dent->d_name[0] == '.')
continue;
strlcpy(device, sysfs_path, sizeof(device));
start = strlcat(device, "/", sizeof(device));
end = strlcat(device, dent->d_name, sizeof(device));
if (end > sizeof(device))
end = sizeof(device);
/* replace PATH_TO_NAME_CHAR with '/' */
for (i = start; i < end; i++)
if (device[i] == PATH_TO_NAME_CHAR)
device[i] = '/';
device_list_insert(device);
}
closedir(dir);
}
}
int main(int argc, char *argv[], char *envp[])
{
int failed = 0;
int option;
static const struct option options[] = {
{ "verbose", 0, NULL, 'v' },
{ "dry-run", 0, NULL, 'n' },
{ "retry-failed", 0, NULL, 'F' },
{ "help", 0, NULL, 'h' },
{ "subsystem-match", 1, NULL, 's' },
{ "subsystem-nomatch", 1, NULL, 'S' },
{ "attr-match", 1, NULL, 'a' },
{ "attr-nomatch", 1, NULL, 'A' },
{}
};
logging_init("udevtrigger");
udev_config_init();
dbg("version %s", UDEV_VERSION);
sysfs_init();
while (1) {
option = getopt_long(argc, argv, "vnFhs:S:a:A:", options, NULL);
if (option == -1)
break;
switch (option) {
case 'v':
verbose = 1;
break;
case 'n':
dry_run = 1;
break;
case 'F':
failed = 1;
break;
case 's':
name_list_add(&filter_subsystem_match_list, optarg, 0);
break;
case 'S':
name_list_add(&filter_subsystem_nomatch_list, optarg, 0);
break;
case 'a':
name_list_add(&filter_attr_match_list, optarg, 0);
break;
case 'A':
name_list_add(&filter_attr_nomatch_list, optarg, 0);
break;
case 'h':
printf("Usage: udevtrigger OPTIONS\n"
" --verbose print the list of devices while running\n"
" --dry-run do not actually trigger the events\n"
" --retry-failed trigger only the events which have been\n"
" marked as failed during a previous run\n"
" --subsystem-match=<subsystem> trigger devices from a matching subystem\n"
" --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
" --attr-match=<file[=<value>]> trigger devices with a matching sysfs\n"
" attribute\n"
" --attr-nomatch=<file[=<value>]> exclude devices with a matching sysfs\n"
" attribute\n"
" --help print this text\n"
"\n");
goto exit;
default:
goto exit;
}
}
if (failed)
scan_failed();
else {
scan_bus();
scan_class();
scan_block();
}
exec_list();
exit:
name_list_cleanup(&filter_subsystem_match_list);
name_list_cleanup(&filter_subsystem_nomatch_list);
name_list_cleanup(&filter_attr_match_list);
name_list_cleanup(&filter_attr_nomatch_list);
sysfs_cleanup();
logging_close();
return 0;
}
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