diff options
Diffstat (limited to 'src/udev/udevadm-trigger.c')
-rw-r--r-- | src/udev/udevadm-trigger.c | 569 |
1 files changed, 569 insertions, 0 deletions
diff --git a/src/udev/udevadm-trigger.c b/src/udev/udevadm-trigger.c new file mode 100644 index 0000000..e0f487d --- /dev/null +++ b/src/udev/udevadm-trigger.c @@ -0,0 +1,569 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <errno.h> +#include <getopt.h> + +#include "sd-device.h" +#include "sd-event.h" + +#include "device-enumerator-private.h" +#include "device-private.h" +#include "device-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "id128-util.h" +#include "parse-util.h" +#include "path-util.h" +#include "process-util.h" +#include "set.h" +#include "static-destruct.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 bool arg_quiet = false; +static bool arg_uuid = false; +static bool arg_settle = false; + +static int exec_list( + sd_device_enumerator *e, + sd_device_action_t action, + Set **ret_settle_path_or_ids) { + + _cleanup_set_free_ Set *settle_path_or_ids = NULL; + int uuid_supported = -1; + const char *action_str; + sd_device *d; + int r, ret = 0; + + assert(e); + + action_str = device_action_to_string(action); + + FOREACH_DEVICE_AND_SUBSYSTEM(e, d) { + sd_id128_t id = SD_ID128_NULL; + const char *syspath; + + r = sd_device_get_syspath(d, &syspath); + if (r < 0) { + log_debug_errno(r, "Failed to get syspath of enumerated devices, ignoring: %m"); + continue; + } + + if (arg_verbose) + printf("%s\n", syspath); + + if (arg_dry_run) + continue; + + /* Use the UUID mode if the user explicitly asked for it, or if --settle has been specified, + * so that we can recognize our own uevent. */ + r = sd_device_trigger_with_uuid(d, action, (arg_uuid || arg_settle) && uuid_supported != 0 ? &id : NULL); + if (r == -EINVAL && !arg_uuid && arg_settle && uuid_supported < 0) { + /* If we specified a UUID because of the settling logic, and we got EINVAL this might + * be caused by an old kernel which doesn't know the UUID logic (pre-4.13). Let's try + * if it works without the UUID logic then. */ + r = sd_device_trigger(d, action); + if (r != -EINVAL) + uuid_supported = false; /* dropping the uuid stuff changed the return code, + * hence don't bother next time */ + } + if (r < 0) { + /* ENOENT may be returned when a device does not have /uevent or is already + * removed. Hence, this is logged at debug level and ignored. + * + * ENODEV may be returned by some buggy device drivers e.g. /sys/devices/vio. + * See, + * https://github.com/systemd/systemd/issues/13652#issuecomment-535129791 and + * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1845319. + * So, this error is ignored, but logged at warning level to encourage people to + * fix the driver. + * + * EROFS is returned when /sys is read only. In that case, all subsequent + * writes will also fail, hence return immediately. + * + * EACCES or EPERM may be returned when this is invoked by non-priviledged user. + * We do NOT return immediately, but continue operation and propagate the error. + * Why? Some device can be owned by a user, e.g., network devices configured in + * a network namespace. See, https://github.com/systemd/systemd/pull/18559 and + * https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ebb4a4bf76f164457184a3f43ebc1552416bc823 + * + * All other errors are logged at error level, but let's continue the operation, + * and propagate the error. + */ + + bool ignore = IN_SET(r, -ENOENT, -ENODEV); + int level = + arg_quiet ? LOG_DEBUG : + r == -ENOENT ? LOG_DEBUG : + r == -ENODEV ? LOG_WARNING : LOG_ERR; + + log_device_full_errno(d, level, r, + "Failed to write '%s' to '%s/uevent'%s: %m", + action_str, syspath, ignore ? ", ignoring" : ""); + + if (r == -EROFS) + return r; + if (ret == 0 && !ignore) + ret = r; + continue; + } else + log_device_debug(d, "Triggered device with action '%s'.", action_str); + + if (uuid_supported < 0) + uuid_supported = true; + + /* If the user asked for it, write event UUID to stdout */ + if (arg_uuid) + printf(SD_ID128_UUID_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(id)); + + if (arg_settle) { + if (uuid_supported) { + sd_id128_t *dup; + + dup = newdup(sd_id128_t, &id, 1); + if (!dup) + return log_oom(); + + r = set_ensure_consume(&settle_path_or_ids, &id128_hash_ops_free, dup); + } else { + char *dup; + + dup = strdup(syspath); + if (!dup) + return log_oom(); + + r = set_ensure_consume(&settle_path_or_ids, &path_hash_ops_free, dup); + } + if (r < 0) + return log_oom(); + } + } + + if (ret_settle_path_or_ids) + *ret_settle_path_or_ids = TAKE_PTR(settle_path_or_ids); + + return ret; +} + +static int device_monitor_handler(sd_device_monitor *m, sd_device *dev, void *userdata) { + Set *settle_path_or_ids = * (Set**) ASSERT_PTR(userdata); + const char *syspath; + sd_id128_t id; + int r; + + assert(dev); + + r = sd_device_get_syspath(dev, &syspath); + if (r < 0) { + log_device_debug_errno(dev, r, "Failed to get syspath of device event, ignoring: %m"); + return 0; + } + + if (sd_device_get_trigger_uuid(dev, &id) >= 0) { + _cleanup_free_ sd_id128_t *saved = NULL; + + saved = set_remove(settle_path_or_ids, &id); + if (!saved) { + log_device_debug(dev, "Got uevent not matching expected UUID, ignoring."); + return 0; + } + } else { + _cleanup_free_ char *saved = NULL; + + saved = set_remove(settle_path_or_ids, syspath); + if (!saved) { + const char *old_sysname; + + /* When the device is renamed, the new name is broadcast, and the old name is saved + * in INTERFACE_OLD. + * + * TODO: remove support for INTERFACE_OLD when kernel baseline is bumped to 4.13 or + * higher. See 1193448cb68e5a90cab027e16a093bbd367e9494. + */ + + if (sd_device_get_property_value(dev, "INTERFACE_OLD", &old_sysname) >= 0) { + _cleanup_free_ char *dir = NULL, *old_syspath = NULL; + + r = path_extract_directory(syspath, &dir); + if (r < 0) { + log_device_debug_errno(dev, r, + "Failed to extract directory from '%s', ignoring: %m", + syspath); + return 0; + } + + old_syspath = path_join(dir, old_sysname); + if (!old_syspath) { + log_oom_debug(); + return 0; + } + + saved = set_remove(settle_path_or_ids, old_syspath); + } + } + if (!saved) { + log_device_debug(dev, "Got uevent for unexpected device, ignoring."); + return 0; + } + } + + if (arg_verbose) + printf("settle %s\n", syspath); + + if (arg_uuid) + printf("settle " SD_ID128_UUID_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(id)); + + if (set_isempty(settle_path_or_ids)) + 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" + " -q --quiet Suppress error logging in triggering events\n" + " -t --type= Type of events to trigger\n" + " devices sysfs devices (default)\n" + " subsystems sysfs subsystems and drivers\n" + " all sysfs devices, subsystems, and drivers\n" + " -c --action=ACTION|help 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=TAG Trigger devices with a matching tag\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" + " --initialized-match Trigger devices that are already initialized\n" + " --initialized-nomatch Trigger devices that are not initialized yet\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" + " --uuid Print synthetic uevent UUID\n" + " --prioritized-subsystem=SUBSYSTEM[,SUBSYSTEM…]\n" + " Trigger devices from a matching subsystem first\n", + program_invocation_short_name); + + return 0; +} + +int trigger_main(int argc, char *argv[], void *userdata) { + enum { + ARG_NAME = 0x100, + ARG_PING, + ARG_UUID, + ARG_PRIORITIZED_SUBSYSTEM, + ARG_INITIALIZED_MATCH, + ARG_INITIALIZED_NOMATCH, + }; + + static const struct option options[] = { + { "verbose", no_argument, NULL, 'v' }, + { "dry-run", no_argument, NULL, 'n' }, + { "quiet", no_argument, NULL, 'q' }, + { "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' }, + { "initialized-match", no_argument, NULL, ARG_INITIALIZED_MATCH }, + { "initialized-nomatch", no_argument, NULL, ARG_INITIALIZED_NOMATCH }, + { "settle", no_argument, NULL, 'w' }, + { "wait-daemon", optional_argument, NULL, ARG_PING }, + { "version", no_argument, NULL, 'V' }, + { "help", no_argument, NULL, 'h' }, + { "uuid", no_argument, NULL, ARG_UUID }, + { "prioritized-subsystem", required_argument, NULL, ARG_PRIORITIZED_SUBSYSTEM }, + {} + }; + enum { + TYPE_DEVICES, + TYPE_SUBSYSTEMS, + TYPE_ALL, + } device_type = TYPE_DEVICES; + sd_device_action_t action = SD_DEVICE_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_ Set *settle_path_or_ids = NULL; + usec_t ping_timeout_usec = 5 * USEC_PER_SEC; + bool 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, "vnqt: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 'q': + arg_quiet = true; + break; + case 't': + if (streq(optarg, "devices")) + device_type = TYPE_DEVICES; + else if (streq(optarg, "subsystems")) + device_type = TYPE_SUBSYSTEMS; + else if (streq(optarg, "all")) + device_type = TYPE_ALL; + else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown type --type=%s", optarg); + break; + case 'c': + r = parse_device_action(optarg, &action); + if (r < 0) + return log_error_errno(r, "Unknown action '%s'", optarg); + if (r == 0) + return 0; + 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 = device_enumerator_add_match_parent_incremental(e, dev); + if (r < 0) + return log_error_errno(r, "Failed to add parent match '%s': %m", optarg); + break; + } + case 'w': + arg_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 = device_enumerator_add_match_parent_incremental(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 ARG_UUID: + arg_uuid = true; + break; + + case ARG_PRIORITIZED_SUBSYSTEM: { + _cleanup_strv_free_ char **subsystems = NULL; + + subsystems = strv_split(optarg, ","); + if (!subsystems) + return log_error_errno(r, "Failed to parse prioritized subsystem '%s': %m", optarg); + + STRV_FOREACH(p, subsystems) { + r = device_enumerator_add_prioritized_subsystem(e, *p); + if (r < 0) + return log_error_errno(r, "Failed to add prioritized subsystem '%s': %m", *p); + } + break; + } + case ARG_INITIALIZED_MATCH: + case ARG_INITIALIZED_NOMATCH: + r = device_enumerator_add_match_is_initialized(e, c == ARG_INITIALIZED_MATCH ? MATCH_INITIALIZED_YES : MATCH_INITIALIZED_NO); + if (r < 0) + return log_error_errno(r, "Failed to set initialized filter: %m"); + break; + case 'V': + return print_version(); + case 'h': + return help(); + case '?': + return -EINVAL; + default: + assert_not_reached(); + } + } + + if (ping) { + _cleanup_(udev_ctrl_unrefp) UdevCtrl *uctrl = NULL; + + r = udev_ctrl_new(&uctrl); + if (r < 0) + return log_error_errno(r, "Failed to initialize udev control: %m"); + + r = udev_ctrl_send_ping(uctrl); + if (r < 0) + return log_error_errno(r, "Failed to connect to udev daemon: %m"); + + r = udev_ctrl_wait(uctrl, ping_timeout_usec); + if (r < 0) + return log_error_errno(r, "Failed to wait for daemon to reply: %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 = device_enumerator_add_match_parent_incremental(e, dev); + if (r < 0) + return log_error_errno(r, "Failed to add parent match '%s': %m", argv[optind]); + } + + if (arg_settle) { + 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_path_or_ids); + 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; + case TYPE_ALL: + r = device_enumerator_scan_devices_and_subsystems(e); + if (r < 0) + return log_error_errno(r, "Failed to scan devices and subsystems: %m"); + break; + default: + assert_not_reached(); + } + + r = exec_list(e, action, arg_settle ? &settle_path_or_ids : NULL); + if (r < 0) + return r; + + if (!set_isempty(settle_path_or_ids)) { + r = sd_event_loop(event); + if (r < 0) + return log_error_errno(r, "Event loop failed: %m"); + } + + return 0; +} |