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-rw-r--r--src/udev/udevadm-settle.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
new file mode 100644
index 0000000..f093b7c
--- /dev/null
+++ b/src/udev/udevadm-settle.c
@@ -0,0 +1,253 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright © 2009 Canonical Ltd.
+ * Copyright © 2009 Scott James Remnant <scott@netsplit.com>
+ */
+
+#include <getopt.h>
+#include <unistd.h>
+
+#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(&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,
+ 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) {
+ if (errno == ENOENT)
+ return log_error_errno(errno, "systemd-udevd is not running.");
+ return log_error_errno(errno, "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 for waiting the udev queue being empty.");
+ if (r < 0)
+ return log_error_errno(r, "Event loop failed: %m");
+
+ return 0;
+}
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