227 lines
7.7 KiB
C
227 lines
7.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright © 2009 Canonical Ltd.
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* Copyright © 2009 Scott James Remnant <scott@netsplit.com>
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <poll.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "sd-bus.h"
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#include "sd-login.h"
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#include "sd-messages.h"
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#include "bus-util.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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#include "udev-ctrl.h"
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#include "udev-util.h"
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#include "udevadm.h"
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#include "unit-def.h"
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#include "util.h"
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#include "virt.h"
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static usec_t arg_timeout = 120 * USEC_PER_SEC;
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static const char *arg_exists = NULL;
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static int help(void) {
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printf("%s settle [OPTIONS]\n\n"
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"Wait for pending udev events.\n\n"
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" -h --help Show this help\n"
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" -V --version Show package version\n"
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" -t --timeout=SEC Maximum time to wait for events\n"
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" -E --exit-if-exists=FILE Stop waiting if file exists\n"
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, program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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static const struct option options[] = {
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{ "timeout", required_argument, NULL, 't' },
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{ "exit-if-exists", required_argument, NULL, 'E' },
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{ "version", no_argument, NULL, 'V' },
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{ "help", no_argument, NULL, 'h' },
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{ "seq-start", required_argument, NULL, 's' }, /* removed */
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{ "seq-end", required_argument, NULL, 'e' }, /* removed */
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{ "quiet", no_argument, NULL, 'q' }, /* removed */
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{}
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};
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int c, r;
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while ((c = getopt_long(argc, argv, "t:E:Vhs:e:q", options, NULL)) >= 0) {
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switch (c) {
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case 't':
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r = parse_sec(optarg, &arg_timeout);
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if (r < 0)
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return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
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break;
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case 'E':
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arg_exists = optarg;
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break;
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case 'V':
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return print_version();
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case 'h':
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return help();
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case 's':
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case 'e':
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case 'q':
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return log_info_errno(SYNTHETIC_ERRNO(EINVAL),
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"Option -%c no longer supported.",
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c);
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unknown option.");
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}
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}
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return 1;
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}
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static int emit_deprecation_warning(void) {
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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_cleanup_strv_free_ char **a = NULL;
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_cleanup_free_ char *unit = NULL;
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int r;
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r = sd_pid_get_unit(0, &unit);
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if (r < 0) {
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log_debug_errno(r, "Failed to determine unit we run in, ignoring: %m");
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return 0;
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}
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if (!streq(unit, "systemd-udev-settle.service"))
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return 0;
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r = bus_connect_system_systemd(&bus);
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if (r < 0)
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log_debug_errno(r, "Failed to open connection to systemd, skipping dependency queries: %m");
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else {
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_cleanup_strv_free_ char **b = NULL;
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_cleanup_free_ char *unit_path = NULL;
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unit_path = unit_dbus_path_from_name("systemd-udev-settle.service");
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if (!unit_path)
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return -ENOMEM;
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(void) sd_bus_get_property_strv(
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bus,
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"org.freedesktop.systemd1",
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unit_path,
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"org.freedesktop.systemd1.Unit",
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"WantedBy",
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NULL,
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&a);
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(void) sd_bus_get_property_strv(
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bus,
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"org.freedesktop.systemd1",
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unit_path,
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"org.freedesktop.systemd1.Unit",
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"RequiredBy",
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NULL,
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&b);
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r = strv_extend_strv(&a, b, true);
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if (r < 0)
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return r;
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}
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if (strv_isempty(a))
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/* Print a simple message if we cannot determine the dependencies */
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log_notice("systemd-udev-settle.service is deprecated.");
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else {
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/* Print a longer, structured message if we can acquire the dependencies (this should be the
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* common case). This is hooked up with a catalog entry and everything. */
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_cleanup_free_ char *t = NULL;
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t = strv_join(a, ", ");
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if (!t)
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return -ENOMEM;
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log_struct(LOG_NOTICE,
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"MESSAGE=systemd-udev-settle.service is deprecated. Please fix %s not to pull it in.", t,
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"OFFENDING_UNITS=%s", t,
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"MESSAGE_ID=" SD_MESSAGE_SYSTEMD_UDEV_SETTLE_DEPRECATED_STR);
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}
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return 0;
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}
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int settle_main(int argc, char *argv[], void *userdata) {
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_cleanup_close_ int fd = -1;
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usec_t deadline;
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int r;
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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if (running_in_chroot() > 0) {
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log_info("Running in chroot, ignoring request.");
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return 0;
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}
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deadline = now(CLOCK_MONOTONIC) + arg_timeout;
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/* guarantee that the udev daemon isn't pre-processing */
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if (getuid() == 0) {
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_cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
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if (udev_ctrl_new(&uctrl) >= 0) {
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r = udev_ctrl_send_ping(uctrl);
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if (r < 0) {
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log_debug_errno(r, "Failed to connect to udev daemon: %m");
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return 0;
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}
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r = udev_ctrl_wait(uctrl, MAX(5 * USEC_PER_SEC, arg_timeout));
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if (r < 0)
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return log_error_errno(r, "Failed to wait for daemon to reply: %m");
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}
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}
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fd = udev_queue_init();
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if (fd < 0) {
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log_debug_errno(fd, "Queue is empty, nothing to watch: %m");
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return 0;
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}
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(void) emit_deprecation_warning();
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for (;;) {
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if (arg_exists && access(arg_exists, F_OK) >= 0)
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return 0;
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/* exit if queue is empty */
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r = udev_queue_is_empty();
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if (r < 0)
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return log_error_errno(r, "Failed to check queue is empty: %m");
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if (r > 0)
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return 0;
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if (now(CLOCK_MONOTONIC) >= deadline)
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return -ETIMEDOUT;
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/* wake up when queue becomes empty */
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r = fd_wait_for_event(fd, POLLIN, MSEC_PER_SEC);
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if (r < 0)
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return r;
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if (r & POLLIN) {
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r = flush_fd(fd);
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if (r < 0)
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return log_error_errno(r, "Failed to flush queue: %m");
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}
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}
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}
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