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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright © 2009 Canonical Ltd.
* Copyright © 2009 Scott James Remnant <scott@netsplit.com>
*/
#include <errno.h>
#include <getopt.h>
#include <poll.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-login.h"
#include "libudev-util.h"
#include "string-util.h"
#include "strv.h"
#include "time-util.h"
#include "udev-ctrl.h"
#include "udevadm.h"
#include "unit-def.h"
#include "util.h"
#include "virt.h"
static usec_t arg_timeout = 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);
if (r < 0)
return log_error_errno(r, "Failed to parse timeout value '%s': %m", optarg);
break;
case 'E':
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("Unknown option.");
}
}
return 1;
}
static int emit_deprecation_warning(void) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
_cleanup_free_ char *unit = NULL, *unit_path = NULL;
_cleanup_strv_free_ char **a = NULL, **b = NULL;
int r;
r = sd_pid_get_unit(0, &unit);
if (r < 0 || !streq(unit, "systemd-udev-settle.service"))
return 0;
log_notice("systemd-udev-settle.service is deprecated.");
r = sd_bus_open_system(&bus);
if (r < 0)
return log_debug_errno(r, "Failed to open system bus, skipping dependency queries: %m");
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(&a, b, true);
if (r < 0)
return r;
if (!strv_isempty(a)) {
_cleanup_free_ char *t = NULL;
t = strv_join(a, ", ");
if (!t)
return -ENOMEM;
log_notice("Hint: please fix %s not to pull it in.", t);
}
return 0;
}
int settle_main(int argc, char *argv[], void *userdata) {
_cleanup_(udev_queue_unrefp) struct udev_queue *queue = NULL;
struct pollfd pfd;
usec_t deadline;
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;
}
deadline = now(CLOCK_MONOTONIC) + arg_timeout;
/* guarantee that the udev daemon isn't pre-processing */
if (getuid() == 0) {
_cleanup_(udev_ctrl_unrefp) struct udev_ctrl *uctrl = NULL;
if (udev_ctrl_new(&uctrl) >= 0) {
r = udev_ctrl_send_ping(uctrl);
if (r < 0) {
log_debug_errno(r, "Failed to connect to udev daemon: %m");
return 0;
}
r = udev_ctrl_wait(uctrl, MAX(5 * USEC_PER_SEC, arg_timeout));
if (r < 0)
return log_error_errno(r, "Failed to wait for daemon to reply: %m");
}
}
queue = udev_queue_new(NULL);
if (!queue)
return log_error_errno(errno, "Failed to get udev queue: %m");
r = udev_queue_get_fd(queue);
if (r < 0) {
log_debug_errno(r, "Queue is empty, nothing to watch.");
return 0;
}
pfd = (struct pollfd) {
.events = POLLIN,
.fd = r,
};
(void) emit_deprecation_warning();
for (;;) {
if (arg_exists && access(arg_exists, F_OK) >= 0)
return 0;
/* exit if queue is empty */
if (udev_queue_get_queue_is_empty(queue))
return 0;
if (now(CLOCK_MONOTONIC) >= deadline)
return -ETIMEDOUT;
/* wake up when queue becomes empty */
if (poll(&pfd, 1, MSEC_PER_SEC) > 0 && pfd.revents & POLLIN) {
r = udev_queue_flush(queue);
if (r < 0)
return log_error_errno(r, "Failed to flush queue: %m");
}
}
}
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