| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * 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 <unistd.h> |
| |
| #include "sd-bus.h" |
| #include "sd-login.h" |
| #include "sd-messages.h" |
| |
| #include "bus-util.h" |
| #include "fd-util.h" |
| #include "io-util.h" |
| #include "string-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 "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_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(&a, b, 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, |
| "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; |
| } |
| |
| int settle_main(int argc, char *argv[], void *userdata) { |
| _cleanup_close_ int fd = -1; |
| 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"); |
| } |
| } |
| |
| fd = udev_queue_init(); |
| if (fd < 0) { |
| log_debug_errno(fd, "Queue is empty, nothing to watch: %m"); |
| return 0; |
| } |
| |
| (void) emit_deprecation_warning(); |
| |
| for (;;) { |
| if (arg_exists && access(arg_exists, F_OK) >= 0) |
| return 0; |
| |
| /* exit if queue is empty */ |
| r = udev_queue_is_empty(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to check queue is empty: %m"); |
| if (r > 0) |
| return 0; |
| |
| if (now(CLOCK_MONOTONIC) >= deadline) |
| return -ETIMEDOUT; |
| |
| /* wake up when queue becomes empty */ |
| r = fd_wait_for_event(fd, POLLIN, MSEC_PER_SEC); |
| if (r < 0) |
| return r; |
| if (r & POLLIN) { |
| r = flush_fd(fd); |
| if (r < 0) |
| return log_error_errno(r, "Failed to flush queue: %m"); |
| } |
| } |
| } |
