1 /* SPDX-License-Identifier: GPL-2.0+ */
9 #include "device-enumerator-private.h"
12 #include "path-util.h"
13 #include "process-util.h"
15 #include "string-util.h"
18 #include "udevadm-util.h"
19 #include "udev-ctrl.h"
22 static bool arg_verbose
= false;
23 static bool arg_dry_run
= false;
25 static int exec_list(sd_device_enumerator
*e
, const char *action
, Set
*settle_set
) {
29 FOREACH_DEVICE_AND_SUBSYSTEM(e
, d
) {
30 _cleanup_free_
char *filename
= NULL
;
33 if (sd_device_get_syspath(d
, &syspath
) < 0)
37 printf("%s\n", syspath
);
41 filename
= path_join(syspath
, "uevent");
45 r
= write_string_file(filename
, action
, WRITE_STRING_FILE_DISABLE_BUFFER
);
47 log_debug_errno(r
, "Failed to write '%s' to '%s', ignoring: %m", action
, filename
);
52 r
= set_put_strdup(settle_set
, syspath
);
61 static int device_monitor_handler(sd_device_monitor
*m
, sd_device
*dev
, void *userdata
) {
62 Set
*settle_set
= userdata
;
68 if (sd_device_get_syspath(dev
, &syspath
) < 0)
72 printf("settle %s\n", syspath
);
74 if (!set_remove(settle_set
, syspath
))
75 log_debug("Got epoll event on syspath %s not present in syspath set", syspath
);
77 if (set_isempty(settle_set
))
78 return sd_event_exit(sd_device_monitor_get_event(m
), 0);
83 static char* keyval(const char *str
, const char **key
, const char **val
) {
90 pos
= strchr(buf
, '=');
102 static int help(void) {
103 printf("%s trigger [OPTIONS] DEVPATH\n\n"
104 "Request events from the kernel.\n\n"
105 " -h --help Show this help\n"
106 " -V --version Show package version\n"
107 " -v --verbose Print the list of devices while running\n"
108 " -n --dry-run Do not actually trigger the events\n"
109 " -t --type= Type of events to trigger\n"
110 " devices sysfs devices (default)\n"
111 " subsystems sysfs subsystems and drivers\n"
112 " -c --action=ACTION Event action value, default is \"change\"\n"
113 " -s --subsystem-match=SUBSYSTEM Trigger devices from a matching subsystem\n"
114 " -S --subsystem-nomatch=SUBSYSTEM Exclude devices from a matching subsystem\n"
115 " -a --attr-match=FILE[=VALUE] Trigger devices with a matching attribute\n"
116 " -A --attr-nomatch=FILE[=VALUE] Exclude devices with a matching attribute\n"
117 " -p --property-match=KEY=VALUE Trigger devices with a matching property\n"
118 " -g --tag-match=KEY=VALUE Trigger devices with a matching property\n"
119 " -y --sysname-match=NAME Trigger devices with this /sys path\n"
120 " --name-match=NAME Trigger devices with this /dev name\n"
121 " -b --parent-match=NAME Trigger devices with that parent device\n"
122 " -w --settle Wait for the triggered events to complete\n"
123 " --wait-daemon[=SECONDS] Wait for udevd daemon to be initialized\n"
124 " before triggering uevents\n"
125 , program_invocation_short_name
);
130 int trigger_main(int argc
, char *argv
[], void *userdata
) {
136 static const struct option options
[] = {
137 { "verbose", no_argument
, NULL
, 'v' },
138 { "dry-run", no_argument
, NULL
, 'n' },
139 { "type", required_argument
, NULL
, 't' },
140 { "action", required_argument
, NULL
, 'c' },
141 { "subsystem-match", required_argument
, NULL
, 's' },
142 { "subsystem-nomatch", required_argument
, NULL
, 'S' },
143 { "attr-match", required_argument
, NULL
, 'a' },
144 { "attr-nomatch", required_argument
, NULL
, 'A' },
145 { "property-match", required_argument
, NULL
, 'p' },
146 { "tag-match", required_argument
, NULL
, 'g' },
147 { "sysname-match", required_argument
, NULL
, 'y' },
148 { "name-match", required_argument
, NULL
, ARG_NAME
},
149 { "parent-match", required_argument
, NULL
, 'b' },
150 { "settle", no_argument
, NULL
, 'w' },
151 { "wait-daemon", optional_argument
, NULL
, ARG_PING
},
152 { "version", no_argument
, NULL
, 'V' },
153 { "help", no_argument
, NULL
, 'h' },
159 } device_type
= TYPE_DEVICES
;
160 const char *action
= "change";
161 _cleanup_(sd_device_enumerator_unrefp
) sd_device_enumerator
*e
= NULL
;
162 _cleanup_(sd_device_monitor_unrefp
) sd_device_monitor
*m
= NULL
;
163 _cleanup_(sd_event_unrefp
) sd_event
*event
= NULL
;
164 _cleanup_set_free_free_ Set
*settle_set
= NULL
;
165 usec_t ping_timeout_usec
= 5 * USEC_PER_SEC
;
166 bool settle
= false, ping
= false;
169 if (running_in_chroot() > 0) {
170 log_info("Running in chroot, ignoring request.");
174 r
= sd_device_enumerator_new(&e
);
178 r
= sd_device_enumerator_allow_uninitialized(e
);
182 while ((c
= getopt_long(argc
, argv
, "vnt:c:s:S:a:A:p:g:y:b:wVh", options
, NULL
)) >= 0) {
183 _cleanup_free_
char *buf
= NULL
;
184 const char *key
, *val
;
194 if (streq(optarg
, "devices"))
195 device_type
= TYPE_DEVICES
;
196 else if (streq(optarg
, "subsystems"))
197 device_type
= TYPE_SUBSYSTEMS
;
199 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unknown type --type=%s", optarg
);
202 if (STR_IN_SET(optarg
, "add", "remove", "change"))
205 log_error_errno(SYNTHETIC_ERRNO(EINVAL
), "Unknown action '%s'", optarg
);
209 r
= sd_device_enumerator_add_match_subsystem(e
, optarg
, true);
211 return log_error_errno(r
, "Failed to add subsystem match '%s': %m", optarg
);
214 r
= sd_device_enumerator_add_match_subsystem(e
, optarg
, false);
216 return log_error_errno(r
, "Failed to add negative subsystem match '%s': %m", optarg
);
219 buf
= keyval(optarg
, &key
, &val
);
222 r
= sd_device_enumerator_add_match_sysattr(e
, key
, val
, true);
224 return log_error_errno(r
, "Failed to add sysattr match '%s=%s': %m", key
, val
);
227 buf
= keyval(optarg
, &key
, &val
);
230 r
= sd_device_enumerator_add_match_sysattr(e
, key
, val
, false);
232 return log_error_errno(r
, "Failed to add negative sysattr match '%s=%s': %m", key
, val
);
235 buf
= keyval(optarg
, &key
, &val
);
238 r
= sd_device_enumerator_add_match_property(e
, key
, val
);
240 return log_error_errno(r
, "Failed to add property match '%s=%s': %m", key
, val
);
243 r
= sd_device_enumerator_add_match_tag(e
, optarg
);
245 return log_error_errno(r
, "Failed to add tag match '%s': %m", optarg
);
248 r
= sd_device_enumerator_add_match_sysname(e
, optarg
);
250 return log_error_errno(r
, "Failed to add sysname match '%s': %m", optarg
);
253 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
255 r
= find_device(optarg
, "/sys", &dev
);
257 return log_error_errno(r
, "Failed to open the device '%s': %m", optarg
);
259 r
= device_enumerator_add_match_parent_incremental(e
, dev
);
261 return log_error_errno(r
, "Failed to add parent match '%s': %m", optarg
);
269 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
271 r
= find_device(optarg
, "/dev/", &dev
);
273 return log_error_errno(r
, "Failed to open the device '%s': %m", optarg
);
275 r
= device_enumerator_add_match_parent_incremental(e
, dev
);
277 return log_error_errno(r
, "Failed to add parent match '%s': %m", optarg
);
284 r
= parse_sec(optarg
, &ping_timeout_usec
);
286 log_error_errno(r
, "Failed to parse timeout value '%s', ignoring: %m", optarg
);
292 return print_version();
298 assert_not_reached("Unknown option");
302 if (!arg_dry_run
|| ping
) {
309 _cleanup_(udev_ctrl_unrefp
) struct udev_ctrl
*uctrl
= NULL
;
311 r
= udev_ctrl_new(&uctrl
);
313 return log_error_errno(r
, "Failed to initialize udev control: %m");
315 r
= udev_ctrl_send_ping(uctrl
);
317 return log_error_errno(r
, "Failed to connect to udev daemon: %m");
319 r
= udev_ctrl_wait(uctrl
, ping_timeout_usec
);
321 return log_error_errno(r
, "Failed to wait for daemon to reply: %m");
324 for (; optind
< argc
; optind
++) {
325 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
327 r
= find_device(argv
[optind
], NULL
, &dev
);
329 return log_error_errno(r
, "Failed to open the device '%s': %m", argv
[optind
]);
331 r
= device_enumerator_add_match_parent_incremental(e
, dev
);
333 return log_error_errno(r
, "Failed to add parent match '%s': %m", argv
[optind
]);
337 settle_set
= set_new(&string_hash_ops
);
341 r
= sd_event_default(&event
);
343 return log_error_errno(r
, "Failed to get default event: %m");
345 r
= sd_device_monitor_new(&m
);
347 return log_error_errno(r
, "Failed to create device monitor object: %m");
349 r
= sd_device_monitor_attach_event(m
, event
);
351 return log_error_errno(r
, "Failed to attach event to device monitor: %m");
353 r
= sd_device_monitor_start(m
, device_monitor_handler
, settle_set
);
355 return log_error_errno(r
, "Failed to start device monitor: %m");
358 switch (device_type
) {
359 case TYPE_SUBSYSTEMS
:
360 r
= device_enumerator_scan_subsystems(e
);
362 return log_error_errno(r
, "Failed to scan subsystems: %m");
365 r
= device_enumerator_scan_devices(e
);
367 return log_error_errno(r
, "Failed to scan devices: %m");
370 assert_not_reached("Unknown device type");
372 r
= exec_list(e
, action
, settle_set
);
376 if (event
&& !set_isempty(settle_set
)) {
377 r
= sd_event_loop(event
);
379 return log_error_errno(r
, "Event loop failed: %m");