e1e214c56b
Mount fixes
1100 lines
37 KiB
C
1100 lines
37 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <sys/epoll.h>
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#include "alloc-util.h"
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#include "bus-error.h"
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#include "dbus-device.h"
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#include "dbus-unit.h"
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#include "device-private.h"
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#include "device-util.h"
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#include "device.h"
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#include "log.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "serialize.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "swap.h"
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#include "udev-util.h"
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#include "unit-name.h"
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#include "unit.h"
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static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = {
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[DEVICE_DEAD] = UNIT_INACTIVE,
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[DEVICE_TENTATIVE] = UNIT_ACTIVATING,
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[DEVICE_PLUGGED] = UNIT_ACTIVE,
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};
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static int device_dispatch_io(sd_device_monitor *monitor, sd_device *dev, void *userdata);
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static void device_update_found_one(Device *d, DeviceFound found, DeviceFound mask);
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static void device_unset_sysfs(Device *d) {
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Hashmap *devices;
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Device *first;
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assert(d);
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if (!d->sysfs)
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return;
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/* Remove this unit from the chain of devices which share the
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* same sysfs path. */
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devices = UNIT(d)->manager->devices_by_sysfs;
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first = hashmap_get(devices, d->sysfs);
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LIST_REMOVE(same_sysfs, first, d);
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if (first)
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hashmap_remove_and_replace(devices, d->sysfs, first->sysfs, first);
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else
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hashmap_remove(devices, d->sysfs);
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d->sysfs = mfree(d->sysfs);
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}
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static int device_set_sysfs(Device *d, const char *sysfs) {
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_cleanup_free_ char *copy = NULL;
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Device *first;
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int r;
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assert(d);
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if (streq_ptr(d->sysfs, sysfs))
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return 0;
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r = hashmap_ensure_allocated(&UNIT(d)->manager->devices_by_sysfs, &path_hash_ops);
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if (r < 0)
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return r;
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copy = strdup(sysfs);
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if (!copy)
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return -ENOMEM;
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device_unset_sysfs(d);
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first = hashmap_get(UNIT(d)->manager->devices_by_sysfs, sysfs);
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LIST_PREPEND(same_sysfs, first, d);
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r = hashmap_replace(UNIT(d)->manager->devices_by_sysfs, copy, first);
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if (r < 0) {
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LIST_REMOVE(same_sysfs, first, d);
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return r;
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}
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d->sysfs = TAKE_PTR(copy);
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unit_add_to_dbus_queue(UNIT(d));
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return 0;
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}
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static void device_init(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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assert(UNIT(d)->load_state == UNIT_STUB);
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/* In contrast to all other unit types we timeout jobs waiting
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* for devices by default. This is because they otherwise wait
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* indefinitely for plugged in devices, something which cannot
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* happen for the other units since their operations time out
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* anyway. */
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u->job_running_timeout = u->manager->default_timeout_start_usec;
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u->ignore_on_isolate = true;
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d->deserialized_state = _DEVICE_STATE_INVALID;
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}
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static void device_done(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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device_unset_sysfs(d);
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d->wants_property = strv_free(d->wants_property);
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}
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static int device_load(Unit *u) {
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int r;
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r = unit_load_fragment_and_dropin(u, false);
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if (r < 0)
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return r;
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if (!u->description) {
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/* Generate a description based on the path, to be used until the
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device is initialized properly */
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r = unit_name_to_path(u->id, &u->description);
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if (r < 0)
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log_unit_debug_errno(u, r, "Failed to unescape name: %m");
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}
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return 0;
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}
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static void device_set_state(Device *d, DeviceState state) {
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DeviceState old_state;
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assert(d);
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if (d->state != state)
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bus_unit_send_pending_change_signal(UNIT(d), false);
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old_state = d->state;
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d->state = state;
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if (state == DEVICE_DEAD)
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device_unset_sysfs(d);
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if (state != old_state)
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log_unit_debug(UNIT(d), "Changed %s -> %s", device_state_to_string(old_state), device_state_to_string(state));
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unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state], 0);
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}
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static int device_coldplug(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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assert(d->state == DEVICE_DEAD);
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/* First, let's put the deserialized state and found mask into effect, if we have it. */
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if (d->deserialized_state < 0 ||
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(d->deserialized_state == d->state &&
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d->deserialized_found == d->found))
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return 0;
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d->found = d->deserialized_found;
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device_set_state(d, d->deserialized_state);
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return 0;
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}
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static void device_catchup(Unit *u) {
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Device *d = DEVICE(u);
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assert(d);
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/* Second, let's update the state with the enumerated state if it's different */
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if (d->enumerated_found == d->found)
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return;
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device_update_found_one(d, d->enumerated_found, DEVICE_FOUND_MASK);
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}
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static const struct {
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DeviceFound flag;
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const char *name;
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} device_found_map[] = {
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{ DEVICE_FOUND_UDEV, "found-udev" },
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{ DEVICE_FOUND_MOUNT, "found-mount" },
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{ DEVICE_FOUND_SWAP, "found-swap" },
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};
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static int device_found_to_string_many(DeviceFound flags, char **ret) {
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_cleanup_free_ char *s = NULL;
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unsigned i;
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assert(ret);
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for (i = 0; i < ELEMENTSOF(device_found_map); i++) {
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if (!FLAGS_SET(flags, device_found_map[i].flag))
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continue;
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if (!strextend_with_separator(&s, ",", device_found_map[i].name, NULL))
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return -ENOMEM;
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}
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*ret = TAKE_PTR(s);
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return 0;
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}
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static int device_found_from_string_many(const char *name, DeviceFound *ret) {
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DeviceFound flags = 0;
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int r;
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assert(ret);
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for (;;) {
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_cleanup_free_ char *word = NULL;
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DeviceFound f = 0;
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unsigned i;
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r = extract_first_word(&name, &word, ",", 0);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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for (i = 0; i < ELEMENTSOF(device_found_map); i++)
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if (streq(word, device_found_map[i].name)) {
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f = device_found_map[i].flag;
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break;
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}
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if (f == 0)
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return -EINVAL;
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flags |= f;
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}
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*ret = flags;
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return 0;
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}
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static int device_serialize(Unit *u, FILE *f, FDSet *fds) {
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_cleanup_free_ char *s = NULL;
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Device *d = DEVICE(u);
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assert(u);
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assert(f);
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assert(fds);
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(void) serialize_item(f, "state", device_state_to_string(d->state));
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if (device_found_to_string_many(d->found, &s) >= 0)
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(void) serialize_item(f, "found", s);
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return 0;
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}
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static int device_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
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Device *d = DEVICE(u);
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int r;
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assert(u);
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assert(key);
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assert(value);
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assert(fds);
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if (streq(key, "state")) {
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DeviceState state;
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state = device_state_from_string(value);
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if (state < 0)
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log_unit_debug(u, "Failed to parse state value, ignoring: %s", value);
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else
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d->deserialized_state = state;
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} else if (streq(key, "found")) {
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r = device_found_from_string_many(value, &d->deserialized_found);
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if (r < 0)
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log_unit_debug_errno(u, r, "Failed to parse found value '%s', ignoring: %m", value);
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} else
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log_unit_debug(u, "Unknown serialization key: %s", key);
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return 0;
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}
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static void device_dump(Unit *u, FILE *f, const char *prefix) {
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Device *d = DEVICE(u);
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_cleanup_free_ char *s = NULL;
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assert(d);
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(void) device_found_to_string_many(d->found, &s);
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fprintf(f,
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"%sDevice State: %s\n"
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"%sSysfs Path: %s\n"
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"%sFound: %s\n",
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prefix, device_state_to_string(d->state),
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prefix, strna(d->sysfs),
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prefix, strna(s));
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if (!strv_isempty(d->wants_property)) {
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char **i;
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STRV_FOREACH(i, d->wants_property)
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fprintf(f, "%sudev SYSTEMD_WANTS: %s\n",
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prefix, *i);
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}
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}
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_pure_ static UnitActiveState device_active_state(Unit *u) {
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assert(u);
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return state_translation_table[DEVICE(u)->state];
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}
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_pure_ static const char *device_sub_state_to_string(Unit *u) {
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assert(u);
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return device_state_to_string(DEVICE(u)->state);
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}
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static int device_update_description(Unit *u, sd_device *dev, const char *path) {
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_cleanup_free_ char *j = NULL;
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const char *model, *label, *desc;
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int r;
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assert(u);
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assert(path);
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desc = path;
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if (dev &&
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(sd_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE", &model) >= 0 ||
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sd_device_get_property_value(dev, "ID_MODEL", &model) >= 0)) {
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desc = model;
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/* Try to concatenate the device model string with a label, if there is one */
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if (sd_device_get_property_value(dev, "ID_FS_LABEL", &label) >= 0 ||
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sd_device_get_property_value(dev, "ID_PART_ENTRY_NAME", &label) >= 0 ||
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sd_device_get_property_value(dev, "ID_PART_ENTRY_NUMBER", &label) >= 0) {
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desc = j = strjoin(model, " ", label);
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if (!j)
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return log_oom();
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}
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}
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r = unit_set_description(u, desc);
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to set device description: %m");
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return 0;
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}
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static int device_add_udev_wants(Unit *u, sd_device *dev) {
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_cleanup_strv_free_ char **added = NULL;
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const char *wants, *property;
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Device *d = DEVICE(u);
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int r;
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assert(d);
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assert(dev);
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property = MANAGER_IS_USER(u->manager) ? "SYSTEMD_USER_WANTS" : "SYSTEMD_WANTS";
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r = sd_device_get_property_value(dev, property, &wants);
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if (r < 0)
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return 0;
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for (;;) {
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_cleanup_free_ char *word = NULL, *k = NULL;
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r = extract_first_word(&wants, &word, NULL, EXTRACT_UNQUOTE);
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if (r == 0)
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break;
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if (r == -ENOMEM)
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return log_oom();
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to parse property %s with value %s: %m", property, wants);
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if (unit_name_is_valid(word, UNIT_NAME_TEMPLATE) && d->sysfs) {
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_cleanup_free_ char *escaped = NULL;
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/* If the unit name is specified as template, then automatically fill in the sysfs path of the
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* device as instance name, properly escaped. */
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r = unit_name_path_escape(d->sysfs, &escaped);
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to escape %s: %m", d->sysfs);
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r = unit_name_replace_instance(word, escaped, &k);
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to build %s instance of template %s: %m", escaped, word);
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} else {
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/* If this is not a template, then let's mangle it so, that it becomes a valid unit name. */
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r = unit_name_mangle(word, UNIT_NAME_MANGLE_WARN, &k);
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to mangle unit name \"%s\": %m", word);
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}
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r = unit_add_dependency_by_name(u, UNIT_WANTS, k, true, UNIT_DEPENDENCY_UDEV);
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if (r < 0)
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return log_unit_error_errno(u, r, "Failed to add Wants= dependency: %m");
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r = strv_push(&added, k);
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if (r < 0)
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return log_oom();
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k = NULL;
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}
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if (d->state != DEVICE_DEAD) {
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char **i;
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/* So here's a special hack, to compensate for the fact that the udev database's reload cycles are not
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* synchronized with our own reload cycles: when we detect that the SYSTEMD_WANTS property of a device
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* changes while the device unit is already up, let's manually trigger any new units listed in it not
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* seen before. This typically happens during the boot-time switch root transition, as udev devices
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* will generally already be up in the initrd, but SYSTEMD_WANTS properties get then added through udev
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* rules only available on the host system, and thus only when the initial udev coldplug trigger runs.
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*
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* We do this only if the device has been up already when we parse this, as otherwise the usual
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* dependency logic that is run from the dead → plugged transition will trigger these deps. */
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STRV_FOREACH(i, added) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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if (strv_contains(d->wants_property, *i)) /* Was this unit already listed before? */
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continue;
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r = manager_add_job_by_name(u->manager, JOB_START, *i, JOB_FAIL, NULL, &error, NULL);
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if (r < 0)
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log_unit_warning_errno(u, r, "Failed to enqueue SYSTEMD_WANTS= job, ignoring: %s", bus_error_message(&error, r));
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}
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}
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strv_free(d->wants_property);
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d->wants_property = TAKE_PTR(added);
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return 0;
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}
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static bool device_is_bound_by_mounts(Device *d, sd_device *dev) {
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const char *bound_by;
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int r;
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assert(d);
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assert(dev);
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if (sd_device_get_property_value(dev, "SYSTEMD_MOUNT_DEVICE_BOUND", &bound_by) >= 0) {
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r = parse_boolean(bound_by);
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if (r < 0)
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log_device_warning_errno(dev, r, "Failed to parse SYSTEMD_MOUNT_DEVICE_BOUND='%s' udev property, ignoring: %m", bound_by);
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d->bind_mounts = r > 0;
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} else
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d->bind_mounts = false;
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return d->bind_mounts;
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}
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static void device_upgrade_mount_deps(Unit *u) {
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Unit *other;
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Iterator i;
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void *v;
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int r;
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/* Let's upgrade Requires= to BindsTo= on us. (Used when SYSTEMD_MOUNT_DEVICE_BOUND is set) */
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HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REQUIRED_BY], i) {
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if (other->type != UNIT_MOUNT)
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continue;
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r = unit_add_dependency(other, UNIT_BINDS_TO, u, true, UNIT_DEPENDENCY_UDEV);
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if (r < 0)
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log_unit_warning_errno(u, r, "Failed to add BindsTo= dependency between device and mount unit, ignoring: %m");
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}
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}
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static int device_setup_unit(Manager *m, sd_device *dev, const char *path, bool main) {
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_cleanup_free_ char *e = NULL;
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const char *sysfs = NULL;
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Unit *u = NULL;
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bool delete;
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int r;
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assert(m);
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assert(path);
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if (dev) {
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r = sd_device_get_syspath(dev, &sysfs);
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if (r < 0) {
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log_device_debug_errno(dev, r, "Couldn't get syspath from device, ignoring: %m");
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return 0;
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}
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}
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r = unit_name_from_path(path, ".device", &e);
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if (r < 0)
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return log_device_error_errno(dev, r, "Failed to generate unit name from device path: %m");
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u = manager_get_unit(m, e);
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if (u) {
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/* The device unit can still be present even if the device was unplugged: a mount unit can reference it
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* hence preventing the GC to have garbaged it. That's desired since the device unit may have a
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* dependency on the mount unit which was added during the loading of the later. When the device is
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* plugged the sysfs might not be initialized yet, as we serialize the device's state but do not
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* serialize the sysfs path across reloads/reexecs. Hence, when coming back from a reload/restart we
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* might have the state valid, but not the sysfs path. Hence, let's filter out conflicting devices, but
|
|
* let's accept devices in any state with no sysfs path set. */
|
|
|
|
if (DEVICE(u)->state == DEVICE_PLUGGED &&
|
|
DEVICE(u)->sysfs &&
|
|
sysfs &&
|
|
!path_equal(DEVICE(u)->sysfs, sysfs)) {
|
|
log_unit_debug(u, "Device %s appeared twice with different sysfs paths %s and %s, ignoring the latter.",
|
|
e, DEVICE(u)->sysfs, sysfs);
|
|
return -EEXIST;
|
|
}
|
|
|
|
delete = false;
|
|
|
|
/* Let's remove all dependencies generated due to udev properties. We'll re-add whatever is configured
|
|
* now below. */
|
|
unit_remove_dependencies(u, UNIT_DEPENDENCY_UDEV);
|
|
} else {
|
|
delete = true;
|
|
|
|
r = unit_new_for_name(m, sizeof(Device), e, &u);
|
|
if (r < 0) {
|
|
log_device_error_errno(dev, r, "Failed to allocate device unit %s: %m", e);
|
|
goto fail;
|
|
}
|
|
|
|
unit_add_to_load_queue(u);
|
|
}
|
|
|
|
/* If this was created via some dependency and has not actually been seen yet ->sysfs will not be
|
|
* initialized. Hence initialize it if necessary. */
|
|
if (sysfs) {
|
|
r = device_set_sysfs(DEVICE(u), sysfs);
|
|
if (r < 0) {
|
|
log_unit_error_errno(u, r, "Failed to set sysfs path %s: %m", sysfs);
|
|
goto fail;
|
|
}
|
|
|
|
/* The additional systemd udev properties we only interpret for the main object */
|
|
if (main)
|
|
(void) device_add_udev_wants(u, dev);
|
|
}
|
|
|
|
(void) device_update_description(u, dev, path);
|
|
|
|
/* So the user wants the mount units to be bound to the device but a mount unit might has been seen by systemd
|
|
* before the device appears on its radar. In this case the device unit is partially initialized and includes
|
|
* the deps on the mount unit but at that time the "bind mounts" flag wasn't not present. Fix this up now. */
|
|
if (dev && device_is_bound_by_mounts(DEVICE(u), dev))
|
|
device_upgrade_mount_deps(u);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (delete)
|
|
unit_free(u);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int device_process_new(Manager *m, sd_device *dev) {
|
|
const char *sysfs, *dn, *alias;
|
|
dev_t devnum;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (sd_device_get_syspath(dev, &sysfs) < 0)
|
|
return 0;
|
|
|
|
/* Add the main unit named after the sysfs path */
|
|
r = device_setup_unit(m, dev, sysfs, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Add an additional unit for the device node */
|
|
if (sd_device_get_devname(dev, &dn) >= 0)
|
|
(void) device_setup_unit(m, dev, dn, false);
|
|
|
|
/* Add additional units for all symlinks */
|
|
if (sd_device_get_devnum(dev, &devnum) >= 0) {
|
|
const char *p;
|
|
|
|
FOREACH_DEVICE_DEVLINK(dev, p) {
|
|
struct stat st;
|
|
|
|
if (PATH_STARTSWITH_SET(p, "/dev/block/", "/dev/char/"))
|
|
continue;
|
|
|
|
/* Verify that the symlink in the FS actually belongs
|
|
* to this device. This is useful to deal with
|
|
* conflicting devices, e.g. when two disks want the
|
|
* same /dev/disk/by-label/xxx link because they have
|
|
* the same label. We want to make sure that the same
|
|
* device that won the symlink wins in systemd, so we
|
|
* check the device node major/minor */
|
|
if (stat(p, &st) >= 0 &&
|
|
((!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) ||
|
|
st.st_rdev != devnum))
|
|
continue;
|
|
|
|
(void) device_setup_unit(m, dev, p, false);
|
|
}
|
|
}
|
|
|
|
/* Add additional units for all explicitly configured aliases */
|
|
if (sd_device_get_property_value(dev, "SYSTEMD_ALIAS", &alias) < 0)
|
|
return 0;
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *word = NULL;
|
|
|
|
r = extract_first_word(&alias, &word, NULL, EXTRACT_UNQUOTE);
|
|
if (r == 0)
|
|
break;
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0)
|
|
return log_device_warning_errno(dev, r, "Failed to parse SYSTEMD_ALIAS property: %m");
|
|
|
|
if (!path_is_absolute(word))
|
|
log_device_warning(dev, "SYSTEMD_ALIAS is not an absolute path, ignoring: %s", word);
|
|
else if (!path_is_normalized(word))
|
|
log_device_warning(dev, "SYSTEMD_ALIAS is not a normalized path, ignoring: %s", word);
|
|
else
|
|
(void) device_setup_unit(m, dev, word, false);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void device_found_changed(Device *d, DeviceFound previous, DeviceFound now) {
|
|
assert(d);
|
|
|
|
/* Didn't exist before, but does now? if so, generate a new invocation ID for it */
|
|
if (previous == DEVICE_NOT_FOUND && now != DEVICE_NOT_FOUND)
|
|
(void) unit_acquire_invocation_id(UNIT(d));
|
|
|
|
if (FLAGS_SET(now, DEVICE_FOUND_UDEV))
|
|
/* When the device is known to udev we consider it plugged. */
|
|
device_set_state(d, DEVICE_PLUGGED);
|
|
else if (now != DEVICE_NOT_FOUND && !FLAGS_SET(previous, DEVICE_FOUND_UDEV))
|
|
/* If the device has not been seen by udev yet, but is now referenced by the kernel, then we assume the
|
|
* kernel knows it now, and udev might soon too. */
|
|
device_set_state(d, DEVICE_TENTATIVE);
|
|
else
|
|
/* If nobody sees the device, or if the device was previously seen by udev and now is only referenced
|
|
* from the kernel, then we consider the device is gone, the kernel just hasn't noticed it yet. */
|
|
device_set_state(d, DEVICE_DEAD);
|
|
}
|
|
|
|
static void device_update_found_one(Device *d, DeviceFound found, DeviceFound mask) {
|
|
Manager *m;
|
|
|
|
assert(d);
|
|
|
|
m = UNIT(d)->manager;
|
|
|
|
if (MANAGER_IS_RUNNING(m) && (m->honor_device_enumeration || MANAGER_IS_USER(m))) {
|
|
DeviceFound n, previous;
|
|
|
|
/* When we are already running, then apply the new mask right-away, and trigger state changes
|
|
* right-away */
|
|
|
|
n = (d->found & ~mask) | (found & mask);
|
|
if (n == d->found)
|
|
return;
|
|
|
|
previous = d->found;
|
|
d->found = n;
|
|
|
|
device_found_changed(d, previous, n);
|
|
} else
|
|
/* We aren't running yet, let's apply the new mask to the shadow variable instead, which we'll apply as
|
|
* soon as we catch-up with the state. */
|
|
d->enumerated_found = (d->enumerated_found & ~mask) | (found & mask);
|
|
}
|
|
|
|
static void device_update_found_by_sysfs(Manager *m, const char *sysfs, DeviceFound found, DeviceFound mask) {
|
|
Device *d, *l, *n;
|
|
|
|
assert(m);
|
|
assert(sysfs);
|
|
|
|
if (mask == 0)
|
|
return;
|
|
|
|
l = hashmap_get(m->devices_by_sysfs, sysfs);
|
|
LIST_FOREACH_SAFE(same_sysfs, d, n, l)
|
|
device_update_found_one(d, found, mask);
|
|
}
|
|
|
|
static int device_update_found_by_name(Manager *m, const char *path, DeviceFound found, DeviceFound mask) {
|
|
_cleanup_free_ char *e = NULL;
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(path);
|
|
|
|
if (mask == 0)
|
|
return 0;
|
|
|
|
r = unit_name_from_path(path, ".device", &e);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate unit name from device path: %m");
|
|
|
|
u = manager_get_unit(m, e);
|
|
if (!u)
|
|
return 0;
|
|
|
|
device_update_found_one(DEVICE(u), found, mask);
|
|
return 0;
|
|
}
|
|
|
|
static bool device_is_ready(sd_device *dev) {
|
|
const char *ready;
|
|
|
|
assert(dev);
|
|
|
|
if (device_is_renaming(dev) > 0)
|
|
return false;
|
|
|
|
if (sd_device_get_property_value(dev, "SYSTEMD_READY", &ready) < 0)
|
|
return true;
|
|
|
|
return parse_boolean(ready) != 0;
|
|
}
|
|
|
|
static Unit *device_following(Unit *u) {
|
|
Device *d = DEVICE(u);
|
|
Device *other, *first = NULL;
|
|
|
|
assert(d);
|
|
|
|
if (startswith(u->id, "sys-"))
|
|
return NULL;
|
|
|
|
/* Make everybody follow the unit that's named after the sysfs path */
|
|
LIST_FOREACH_AFTER(same_sysfs, other, d)
|
|
if (startswith(UNIT(other)->id, "sys-"))
|
|
return UNIT(other);
|
|
|
|
LIST_FOREACH_BEFORE(same_sysfs, other, d) {
|
|
if (startswith(UNIT(other)->id, "sys-"))
|
|
return UNIT(other);
|
|
|
|
first = other;
|
|
}
|
|
|
|
return UNIT(first);
|
|
}
|
|
|
|
static int device_following_set(Unit *u, Set **_set) {
|
|
Device *d = DEVICE(u), *other;
|
|
_cleanup_set_free_ Set *set = NULL;
|
|
int r;
|
|
|
|
assert(d);
|
|
assert(_set);
|
|
|
|
if (LIST_JUST_US(same_sysfs, d)) {
|
|
*_set = NULL;
|
|
return 0;
|
|
}
|
|
|
|
set = set_new(NULL);
|
|
if (!set)
|
|
return -ENOMEM;
|
|
|
|
LIST_FOREACH_AFTER(same_sysfs, other, d) {
|
|
r = set_put(set, other);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
LIST_FOREACH_BEFORE(same_sysfs, other, d) {
|
|
r = set_put(set, other);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
*_set = TAKE_PTR(set);
|
|
return 1;
|
|
}
|
|
|
|
static void device_shutdown(Manager *m) {
|
|
assert(m);
|
|
|
|
m->device_monitor = sd_device_monitor_unref(m->device_monitor);
|
|
m->devices_by_sysfs = hashmap_free(m->devices_by_sysfs);
|
|
}
|
|
|
|
static void device_enumerate(Manager *m) {
|
|
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
|
|
sd_device *dev;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
if (!m->device_monitor) {
|
|
r = sd_device_monitor_new(&m->device_monitor);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to allocate device monitor: %m");
|
|
goto fail;
|
|
}
|
|
|
|
/* This will fail if we are unprivileged, but that
|
|
* should not matter much, as user instances won't run
|
|
* during boot. */
|
|
(void) sd_device_monitor_set_receive_buffer_size(m->device_monitor, 128*1024*1024);
|
|
|
|
r = sd_device_monitor_filter_add_match_tag(m->device_monitor, "systemd");
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add udev tag match: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_device_monitor_attach_event(m->device_monitor, m->event);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to attach event to device monitor: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_device_monitor_start(m->device_monitor, device_dispatch_io, m);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to start device monitor: %m");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
r = sd_device_enumerator_new(&e);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to allocate device enumerator: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_device_enumerator_add_match_tag(e, "systemd");
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set tag for device enumeration: %m");
|
|
goto fail;
|
|
}
|
|
|
|
FOREACH_DEVICE(e, dev) {
|
|
const char *sysfs;
|
|
|
|
if (!device_is_ready(dev))
|
|
continue;
|
|
|
|
(void) device_process_new(m, dev);
|
|
|
|
if (sd_device_get_syspath(dev, &sysfs) < 0)
|
|
continue;
|
|
|
|
device_update_found_by_sysfs(m, sysfs, DEVICE_FOUND_UDEV, DEVICE_FOUND_UDEV);
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
device_shutdown(m);
|
|
}
|
|
|
|
static void device_propagate_reload_by_sysfs(Manager *m, const char *sysfs) {
|
|
Device *d, *l, *n;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(sysfs);
|
|
|
|
l = hashmap_get(m->devices_by_sysfs, sysfs);
|
|
LIST_FOREACH_SAFE(same_sysfs, d, n, l) {
|
|
if (d->state == DEVICE_DEAD)
|
|
continue;
|
|
|
|
r = manager_propagate_reload(m, UNIT(d), JOB_REPLACE, NULL);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to propagate reload, ignoring: %m");
|
|
}
|
|
}
|
|
|
|
static int device_dispatch_io(sd_device_monitor *monitor, sd_device *dev, void *userdata) {
|
|
Manager *m = userdata;
|
|
DeviceAction action;
|
|
const char *sysfs;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(dev);
|
|
|
|
r = sd_device_get_syspath(dev, &sysfs);
|
|
if (r < 0) {
|
|
log_device_error_errno(dev, r, "Failed to get device sys path: %m");
|
|
return 0;
|
|
}
|
|
|
|
r = device_get_action(dev, &action);
|
|
if (r < 0) {
|
|
log_device_error_errno(dev, r, "Failed to get udev action: %m");
|
|
return 0;
|
|
}
|
|
|
|
if (action == DEVICE_ACTION_CHANGE)
|
|
device_propagate_reload_by_sysfs(m, sysfs);
|
|
|
|
/* A change event can signal that a device is becoming ready, in particular if
|
|
* the device is using the SYSTEMD_READY logic in udev
|
|
* so we need to reach the else block of the following if, even for change events */
|
|
if (action == DEVICE_ACTION_REMOVE) {
|
|
r = swap_process_device_remove(m, dev);
|
|
if (r < 0)
|
|
log_device_warning_errno(dev, r, "Failed to process swap device remove event, ignoring: %m");
|
|
|
|
/* If we get notified that a device was removed by
|
|
* udev, then it's completely gone, hence unset all
|
|
* found bits */
|
|
device_update_found_by_sysfs(m, sysfs, 0, DEVICE_FOUND_UDEV|DEVICE_FOUND_MOUNT|DEVICE_FOUND_SWAP);
|
|
|
|
} else if (device_is_ready(dev)) {
|
|
|
|
(void) device_process_new(m, dev);
|
|
|
|
r = swap_process_device_new(m, dev);
|
|
if (r < 0)
|
|
log_device_warning_errno(dev, r, "Failed to process swap device new event, ignoring: %m");
|
|
|
|
manager_dispatch_load_queue(m);
|
|
|
|
/* The device is found now, set the udev found bit */
|
|
device_update_found_by_sysfs(m, sysfs, DEVICE_FOUND_UDEV, DEVICE_FOUND_UDEV);
|
|
|
|
} else {
|
|
/* The device is nominally around, but not ready for
|
|
* us. Hence unset the udev bit, but leave the rest
|
|
* around. */
|
|
|
|
device_update_found_by_sysfs(m, sysfs, 0, DEVICE_FOUND_UDEV);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool device_supported(void) {
|
|
static int read_only = -1;
|
|
|
|
/* If /sys is read-only we don't support device units, and any
|
|
* attempts to start one should fail immediately. */
|
|
|
|
if (read_only < 0)
|
|
read_only = path_is_read_only_fs("/sys");
|
|
|
|
return read_only <= 0;
|
|
}
|
|
|
|
static int validate_node(Manager *m, const char *node, sd_device **ret) {
|
|
struct stat st;
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(node);
|
|
assert(ret);
|
|
|
|
/* Validates a device node that showed up in /proc/swaps or /proc/self/mountinfo if it makes sense for us to
|
|
* track. Note that this validator is fine within missing device nodes, but not with badly set up ones! */
|
|
|
|
if (!path_startswith(node, "/dev")) {
|
|
*ret = NULL;
|
|
return 0; /* bad! */
|
|
}
|
|
|
|
if (stat(node, &st) < 0) {
|
|
if (errno != ENOENT)
|
|
return log_error_errno(errno, "Failed to stat() device node file %s: %m", node);
|
|
|
|
*ret = NULL;
|
|
return 1; /* good! (though missing) */
|
|
|
|
} else {
|
|
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
|
|
|
|
r = device_new_from_stat_rdev(&dev, &st);
|
|
if (r == -ENOENT) {
|
|
*ret = NULL;
|
|
return 1; /* good! (though missing) */
|
|
} else if (r == -ENOTTY) {
|
|
*ret = NULL;
|
|
return 0; /* bad! (not a device node but some other kind of file system node) */
|
|
} else if (r < 0)
|
|
return log_error_errno(r, "Failed to get udev device from devnum %u:%u: %m", major(st.st_rdev), minor(st.st_rdev));
|
|
|
|
*ret = TAKE_PTR(dev);
|
|
return 1; /* good! */
|
|
}
|
|
}
|
|
|
|
void device_found_node(Manager *m, const char *node, DeviceFound found, DeviceFound mask) {
|
|
int r;
|
|
|
|
assert(m);
|
|
assert(node);
|
|
|
|
if (!device_supported())
|
|
return;
|
|
|
|
if (mask == 0)
|
|
return;
|
|
|
|
/* This is called whenever we find a device referenced in /proc/swaps or /proc/self/mounts. Such a device might
|
|
* be mounted/enabled at a time where udev has not finished probing it yet, and we thus haven't learned about
|
|
* it yet. In this case we will set the device unit to "tentative" state.
|
|
*
|
|
* This takes a pair of DeviceFound flags parameters. The 'mask' parameter is a bit mask that indicates which
|
|
* bits of 'found' to copy into the per-device DeviceFound flags field. Thus, this function may be used to set
|
|
* and unset individual bits in a single call, while merging partially with previous state. */
|
|
|
|
if ((found & mask) != 0) {
|
|
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
|
|
|
|
/* If the device is known in the kernel and newly appeared, then we'll create a device unit for it,
|
|
* under the name referenced in /proc/swaps or /proc/self/mountinfo. But first, let's validate if
|
|
* everything is alright with the device node. */
|
|
|
|
r = validate_node(m, node, &dev);
|
|
if (r <= 0)
|
|
return; /* Don't create a device unit for this if the device node is borked. */
|
|
|
|
(void) device_setup_unit(m, dev, node, false);
|
|
}
|
|
|
|
/* Update the device unit's state, should it exist */
|
|
(void) device_update_found_by_name(m, node, found, mask);
|
|
}
|
|
|
|
bool device_shall_be_bound_by(Unit *device, Unit *u) {
|
|
assert(device);
|
|
assert(u);
|
|
|
|
if (u->type != UNIT_MOUNT)
|
|
return false;
|
|
|
|
return DEVICE(device)->bind_mounts;
|
|
}
|
|
|
|
const UnitVTable device_vtable = {
|
|
.object_size = sizeof(Device),
|
|
.sections =
|
|
"Unit\0"
|
|
"Device\0"
|
|
"Install\0",
|
|
|
|
.gc_jobs = true,
|
|
|
|
.init = device_init,
|
|
.done = device_done,
|
|
.load = device_load,
|
|
|
|
.coldplug = device_coldplug,
|
|
.catchup = device_catchup,
|
|
|
|
.serialize = device_serialize,
|
|
.deserialize_item = device_deserialize_item,
|
|
|
|
.dump = device_dump,
|
|
|
|
.active_state = device_active_state,
|
|
.sub_state_to_string = device_sub_state_to_string,
|
|
|
|
.following = device_following,
|
|
.following_set = device_following_set,
|
|
|
|
.enumerate = device_enumerate,
|
|
.shutdown = device_shutdown,
|
|
.supported = device_supported,
|
|
|
|
.status_message_formats = {
|
|
.starting_stopping = {
|
|
[0] = "Expecting device %s...",
|
|
},
|
|
.finished_start_job = {
|
|
[JOB_DONE] = "Found device %s.",
|
|
[JOB_TIMEOUT] = "Timed out waiting for device %s.",
|
|
},
|
|
},
|
|
};
|