summaryrefslogtreecommitdiffstats
path: root/src/udev/udevadm-trigger.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/udev/udevadm-trigger.c')
-rw-r--r--src/udev/udevadm-trigger.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/src/udev/udevadm-trigger.c b/src/udev/udevadm-trigger.c
new file mode 100644
index 0000000..9532946
--- /dev/null
+++ b/src/udev/udevadm-trigger.c
@@ -0,0 +1,379 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#include <errno.h>
+#include <getopt.h>
+
+#include "sd-device.h"
+#include "sd-event.h"
+
+#include "device-enumerator-private.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "set.h"
+#include "string-util.h"
+#include "strv.h"
+#include "udevadm.h"
+#include "udevadm-util.h"
+#include "udev-ctrl.h"
+#include "virt.h"
+
+static bool arg_verbose = false;
+static bool arg_dry_run = false;
+
+static int exec_list(sd_device_enumerator *e, const char *action, Set *settle_set) {
+ sd_device *d;
+ int r;
+
+ FOREACH_DEVICE_AND_SUBSYSTEM(e, d) {
+ _cleanup_free_ char *filename = NULL;
+ const char *syspath;
+
+ if (sd_device_get_syspath(d, &syspath) < 0)
+ continue;
+
+ if (arg_verbose)
+ printf("%s\n", syspath);
+ if (arg_dry_run)
+ continue;
+
+ filename = path_join(syspath, "uevent");
+ if (!filename)
+ return log_oom();
+
+ r = write_string_file(filename, action, WRITE_STRING_FILE_DISABLE_BUFFER);
+ if (r < 0) {
+ log_debug_errno(r, "Failed to write '%s' to '%s', ignoring: %m", action, filename);
+ continue;
+ }
+
+ if (settle_set) {
+ r = set_put_strdup(settle_set, syspath);
+ if (r < 0)
+ return log_oom();
+ }
+ }
+
+ return 0;
+}
+
+static int device_monitor_handler(sd_device_monitor *m, sd_device *dev, void *userdata) {
+ Set *settle_set = userdata;
+ const char *syspath;
+
+ assert(dev);
+ assert(settle_set);
+
+ if (sd_device_get_syspath(dev, &syspath) < 0)
+ return 0;
+
+ if (arg_verbose)
+ printf("settle %s\n", syspath);
+
+ if (!set_remove(settle_set, syspath))
+ log_debug("Got epoll event on syspath %s not present in syspath set", syspath);
+
+ if (set_isempty(settle_set))
+ return sd_event_exit(sd_device_monitor_get_event(m), 0);
+
+ return 0;
+}
+
+static char* keyval(const char *str, const char **key, const char **val) {
+ char *buf, *pos;
+
+ buf = strdup(str);
+ if (!buf)
+ return NULL;
+
+ pos = strchr(buf, '=');
+ if (pos) {
+ pos[0] = 0;
+ pos++;
+ }
+
+ *key = buf;
+ *val = pos;
+
+ return buf;
+}
+
+static int help(void) {
+ printf("%s trigger [OPTIONS] DEVPATH\n\n"
+ "Request events from the kernel.\n\n"
+ " -h --help Show this help\n"
+ " -V --version Show package version\n"
+ " -v --verbose Print the list of devices while running\n"
+ " -n --dry-run Do not actually trigger the events\n"
+ " -t --type= Type of events to trigger\n"
+ " devices sysfs devices (default)\n"
+ " subsystems sysfs subsystems and drivers\n"
+ " -c --action=ACTION Event action value, default is \"change\"\n"
+ " -s --subsystem-match=SUBSYSTEM Trigger devices from a matching subsystem\n"
+ " -S --subsystem-nomatch=SUBSYSTEM Exclude devices from a matching subsystem\n"
+ " -a --attr-match=FILE[=VALUE] Trigger devices with a matching attribute\n"
+ " -A --attr-nomatch=FILE[=VALUE] Exclude devices with a matching attribute\n"
+ " -p --property-match=KEY=VALUE Trigger devices with a matching property\n"
+ " -g --tag-match=KEY=VALUE Trigger devices with a matching property\n"
+ " -y --sysname-match=NAME Trigger devices with this /sys path\n"
+ " --name-match=NAME Trigger devices with this /dev name\n"
+ " -b --parent-match=NAME Trigger devices with that parent device\n"
+ " -w --settle Wait for the triggered events to complete\n"
+ " --wait-daemon[=SECONDS] Wait for udevd daemon to be initialized\n"
+ " before triggering uevents\n"
+ , program_invocation_short_name);
+
+ return 0;
+}
+
+int trigger_main(int argc, char *argv[], void *userdata) {
+ enum {
+ ARG_NAME = 0x100,
+ ARG_PING,
+ };
+
+ static const struct option options[] = {
+ { "verbose", no_argument, NULL, 'v' },
+ { "dry-run", no_argument, NULL, 'n' },
+ { "type", required_argument, NULL, 't' },
+ { "action", required_argument, NULL, 'c' },
+ { "subsystem-match", required_argument, NULL, 's' },
+ { "subsystem-nomatch", required_argument, NULL, 'S' },
+ { "attr-match", required_argument, NULL, 'a' },
+ { "attr-nomatch", required_argument, NULL, 'A' },
+ { "property-match", required_argument, NULL, 'p' },
+ { "tag-match", required_argument, NULL, 'g' },
+ { "sysname-match", required_argument, NULL, 'y' },
+ { "name-match", required_argument, NULL, ARG_NAME },
+ { "parent-match", required_argument, NULL, 'b' },
+ { "settle", no_argument, NULL, 'w' },
+ { "wait-daemon", optional_argument, NULL, ARG_PING },
+ { "version", no_argument, NULL, 'V' },
+ { "help", no_argument, NULL, 'h' },
+ {}
+ };
+ enum {
+ TYPE_DEVICES,
+ TYPE_SUBSYSTEMS,
+ } device_type = TYPE_DEVICES;
+ const char *action = "change";
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *m = NULL;
+ _cleanup_(sd_event_unrefp) sd_event *event = NULL;
+ _cleanup_set_free_free_ Set *settle_set = NULL;
+ usec_t ping_timeout_usec = 5 * USEC_PER_SEC;
+ bool settle = false, ping = false;
+ int c, r;
+
+ if (running_in_chroot() > 0) {
+ log_info("Running in chroot, ignoring request.");
+ return 0;
+ }
+
+ r = sd_device_enumerator_new(&e);
+ if (r < 0)
+ return r;
+
+ r = sd_device_enumerator_allow_uninitialized(e);
+ if (r < 0)
+ return r;
+
+ while ((c = getopt_long(argc, argv, "vnt:c:s:S:a:A:p:g:y:b:wVh", options, NULL)) >= 0) {
+ _cleanup_free_ char *buf = NULL;
+ const char *key, *val;
+
+ switch (c) {
+ case 'v':
+ arg_verbose = true;
+ break;
+ case 'n':
+ arg_dry_run = true;
+ break;
+ case 't':
+ if (streq(optarg, "devices"))
+ device_type = TYPE_DEVICES;
+ else if (streq(optarg, "subsystems"))
+ device_type = TYPE_SUBSYSTEMS;
+ else
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown type --type=%s", optarg);
+ break;
+ case 'c':
+ if (STR_IN_SET(optarg, "add", "remove", "change"))
+ action = optarg;
+ else
+ log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown action '%s'", optarg);
+
+ break;
+ case 's':
+ r = sd_device_enumerator_add_match_subsystem(e, optarg, true);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add subsystem match '%s': %m", optarg);
+ break;
+ case 'S':
+ r = sd_device_enumerator_add_match_subsystem(e, optarg, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add negative subsystem match '%s': %m", optarg);
+ break;
+ case 'a':
+ buf = keyval(optarg, &key, &val);
+ if (!buf)
+ return log_oom();
+ r = sd_device_enumerator_add_match_sysattr(e, key, val, true);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add sysattr match '%s=%s': %m", key, val);
+ break;
+ case 'A':
+ buf = keyval(optarg, &key, &val);
+ if (!buf)
+ return log_oom();
+ r = sd_device_enumerator_add_match_sysattr(e, key, val, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add negative sysattr match '%s=%s': %m", key, val);
+ break;
+ case 'p':
+ buf = keyval(optarg, &key, &val);
+ if (!buf)
+ return log_oom();
+ r = sd_device_enumerator_add_match_property(e, key, val);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add property match '%s=%s': %m", key, val);
+ break;
+ case 'g':
+ r = sd_device_enumerator_add_match_tag(e, optarg);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add tag match '%s': %m", optarg);
+ break;
+ case 'y':
+ r = sd_device_enumerator_add_match_sysname(e, optarg);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add sysname match '%s': %m", optarg);
+ break;
+ case 'b': {
+ _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
+
+ r = find_device(optarg, "/sys", &dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
+
+ r = sd_device_enumerator_add_match_parent(e, dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
+ break;
+ }
+ case 'w':
+ settle = true;
+ break;
+
+ case ARG_NAME: {
+ _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
+
+ r = find_device(optarg, "/dev/", &dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open the device '%s': %m", optarg);
+
+ r = sd_device_enumerator_add_match_parent(e, dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add parent match '%s': %m", optarg);
+ break;
+ }
+
+ case ARG_PING: {
+ ping = true;
+ if (optarg) {
+ r = parse_sec(optarg, &ping_timeout_usec);
+ if (r < 0)
+ log_error_errno(r, "Failed to parse timeout value '%s', ignoring: %m", optarg);
+ }
+ break;
+ }
+
+ case 'V':
+ return print_version();
+ case 'h':
+ return help();
+ case '?':
+ return -EINVAL;
+ default:
+ assert_not_reached("Unknown option");
+ }
+ }
+
+ if (!arg_dry_run || ping) {
+ r = must_be_root();
+ if (r < 0)
+ return r;
+ }
+
+ if (ping) {
+ _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
+
+ uctrl = udev_ctrl_new();
+ if (!uctrl)
+ return log_oom();
+
+ r = udev_ctrl_send_ping(uctrl, ping_timeout_usec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to connect to udev daemon: %m");
+ }
+
+ for (; optind < argc; optind++) {
+ _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
+
+ r = find_device(argv[optind], NULL, &dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open the device '%s': %m", argv[optind]);
+
+ r = sd_device_enumerator_add_match_parent(e, dev);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]);
+ }
+
+ if (settle) {
+ settle_set = set_new(&string_hash_ops);
+ if (!settle_set)
+ return log_oom();
+
+ r = sd_event_default(&event);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get default event: %m");
+
+ r = sd_device_monitor_new(&m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create device monitor object: %m");
+
+ r = sd_device_monitor_attach_event(m, event);
+ if (r < 0)
+ return log_error_errno(r, "Failed to attach event to device monitor: %m");
+
+ r = sd_device_monitor_start(m, device_monitor_handler, settle_set);
+ if (r < 0)
+ return log_error_errno(r, "Failed to start device monitor: %m");
+ }
+
+ switch (device_type) {
+ case TYPE_SUBSYSTEMS:
+ r = device_enumerator_scan_subsystems(e);
+ if (r < 0)
+ return log_error_errno(r, "Failed to scan subsystems: %m");
+ break;
+ case TYPE_DEVICES:
+ r = device_enumerator_scan_devices(e);
+ if (r < 0)
+ return log_error_errno(r, "Failed to scan devices: %m");
+ break;
+ default:
+ assert_not_reached("Unknown device type");
+ }
+ r = exec_list(e, action, settle_set);
+ if (r < 0)
+ return r;
+
+ if (event && !set_isempty(settle_set)) {
+ r = sd_event_loop(event);
+ if (r < 0)
+ return log_error_errno(r, "Event loop failed: %m");
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 20:23:50 +0000