/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright © 2009 Canonical Ltd. * Copyright © 2009 Scott James Remnant */ #include #include #include "sd-bus.h" #include "sd-event.h" #include "sd-login.h" #include "sd-messages.h" #include "bus-util.h" #include "path-util.h" #include "strv.h" #include "time-util.h" #include "udev-ctrl.h" #include "udev-util.h" #include "udevadm.h" #include "unit-def.h" #include "virt.h" static usec_t arg_timeout_usec = 120 * USEC_PER_SEC; static const char *arg_exists = NULL; static int help(void) { printf("%s settle [OPTIONS]\n\n" "Wait for pending udev events.\n\n" " -h --help Show this help\n" " -V --version Show package version\n" " -t --timeout=SEC Maximum time to wait for events\n" " -E --exit-if-exists=FILE Stop waiting if file exists\n", program_invocation_short_name); return 0; } static int parse_argv(int argc, char *argv[]) { static const struct option options[] = { { "timeout", required_argument, NULL, 't' }, { "exit-if-exists", required_argument, NULL, 'E' }, { "version", no_argument, NULL, 'V' }, { "help", no_argument, NULL, 'h' }, { "seq-start", required_argument, NULL, 's' }, /* removed */ { "seq-end", required_argument, NULL, 'e' }, /* removed */ { "quiet", no_argument, NULL, 'q' }, /* removed */ {} }; int c, r; while ((c = getopt_long(argc, argv, "t:E:Vhs:e:q", options, NULL)) >= 0) { switch (c) { case 't': r = parse_sec(optarg, &arg_timeout_usec); if (r < 0) return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg); break; case 'E': if (!path_is_valid(optarg)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid path: %s", optarg); arg_exists = optarg; break; case 'V': return print_version(); case 'h': return help(); case 's': case 'e': case 'q': return log_info_errno(SYNTHETIC_ERRNO(EINVAL), "Option -%c no longer supported.", c); case '?': return -EINVAL; default: assert_not_reached(); } } return 1; } static int emit_deprecation_warning(void) { _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; _cleanup_strv_free_ char **a = NULL; _cleanup_free_ char *unit = NULL; int r; r = sd_pid_get_unit(0, &unit); if (r < 0) { log_debug_errno(r, "Failed to determine unit we run in, ignoring: %m"); return 0; } if (!streq(unit, "systemd-udev-settle.service")) return 0; r = bus_connect_system_systemd(&bus); if (r < 0) log_debug_errno(r, "Failed to open connection to systemd, skipping dependency queries: %m"); else { _cleanup_strv_free_ char **b = NULL; _cleanup_free_ char *unit_path = NULL; unit_path = unit_dbus_path_from_name("systemd-udev-settle.service"); if (!unit_path) return -ENOMEM; (void) sd_bus_get_property_strv( bus, "org.freedesktop.systemd1", unit_path, "org.freedesktop.systemd1.Unit", "WantedBy", NULL, &a); (void) sd_bus_get_property_strv( bus, "org.freedesktop.systemd1", unit_path, "org.freedesktop.systemd1.Unit", "RequiredBy", NULL, &b); r = strv_extend_strv_consume(&a, TAKE_PTR(b), /* filter_duplicates = */ true); if (r < 0) return r; } if (strv_isempty(a)) /* Print a simple message if we cannot determine the dependencies */ log_notice("systemd-udev-settle.service is deprecated."); else { /* Print a longer, structured message if we can acquire the dependencies (this should be the * common case). This is hooked up with a catalog entry and everything. */ _cleanup_free_ char *t = NULL; t = strv_join(a, ", "); if (!t) return -ENOMEM; log_struct(LOG_NOTICE, LOG_MESSAGE("systemd-udev-settle.service is deprecated. Please fix %s not to pull it in.", t), "OFFENDING_UNITS=%s", t, "MESSAGE_ID=" SD_MESSAGE_SYSTEMD_UDEV_SETTLE_DEPRECATED_STR); } return 0; } static bool check(void) { int r; if (arg_exists) { if (access(arg_exists, F_OK) >= 0) return true; if (errno != ENOENT) log_warning_errno(errno, "Failed to check the existence of \"%s\", ignoring: %m", arg_exists); } /* exit if queue is empty */ r = udev_queue_is_empty(); if (r < 0) log_warning_errno(r, "Failed to check if udev queue is empty, ignoring: %m"); return r > 0; } static int on_inotify(sd_event_source *s, const struct inotify_event *event, void *userdata) { assert(s); if (check()) return sd_event_exit(sd_event_source_get_event(s), 0); return 0; } int settle_main(int argc, char *argv[], void *userdata) { _cleanup_(sd_event_unrefp) sd_event *event = NULL; int r; r = parse_argv(argc, argv); if (r <= 0) return r; if (running_in_chroot() > 0) { log_info("Running in chroot, ignoring request."); return 0; } (void) emit_deprecation_warning(); if (getuid() == 0) { _cleanup_(udev_ctrl_unrefp) UdevCtrl *uctrl = NULL; /* guarantee that the udev daemon isn't pre-processing */ r = udev_ctrl_new(&uctrl); if (r < 0) return log_error_errno(r, "Failed to create control socket for udev daemon: %m"); r = udev_ctrl_send_ping(uctrl); if (r < 0) { log_debug_errno(r, "Failed to connect to udev daemon, ignoring: %m"); return 0; } r = udev_ctrl_wait(uctrl, MAX(5 * USEC_PER_SEC, arg_timeout_usec)); if (r < 0) return log_error_errno(r, "Failed to wait for daemon to reply: %m"); } else { /* For non-privileged users, at least check if udevd is running. */ if (access("/run/udev/control", F_OK) < 0) return log_error_errno(errno, errno == ENOENT ? "systemd-udevd is not running." : "Failed to check if /run/udev/control exists: %m"); } r = sd_event_default(&event); if (r < 0) return log_error_errno(r, "Failed to get default sd-event object: %m"); r = sd_event_add_inotify(event, NULL, "/run/udev" , IN_DELETE, on_inotify, NULL); if (r < 0) return log_error_errno(r, "Failed to add inotify watch for /run/udev: %m"); if (arg_timeout_usec != USEC_INFINITY) { r = sd_event_add_time_relative(event, NULL, CLOCK_BOOTTIME, arg_timeout_usec, 0, NULL, INT_TO_PTR(-ETIMEDOUT)); if (r < 0) return log_error_errno(r, "Failed to add timer event source: %m"); } /* Check before entering the event loop, as the udev queue may be already empty. */ if (check()) return 0; r = sd_event_loop(event); if (r == -ETIMEDOUT) return log_error_errno(r, "Timed out while waiting for udev queue to empty."); if (r < 0) return log_error_errno(r, "Event loop failed: %m"); return 0; }