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-rw-r--r--src/shared/bus-wait-for-jobs.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/src/shared/bus-wait-for-jobs.c b/src/shared/bus-wait-for-jobs.c
new file mode 100644
index 0000000..b2a9e03
--- /dev/null
+++ b/src/shared/bus-wait-for-jobs.c
@@ -0,0 +1,331 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "bus-wait-for-jobs.h"
+#include "set.h"
+#include "bus-util.h"
+#include "bus-internal.h"
+#include "unit-def.h"
+#include "escape.h"
+#include "strv.h"
+
+typedef struct BusWaitForJobs {
+ sd_bus *bus;
+
+ /* The set of jobs to wait for, as bus object paths */
+ Set *jobs;
+
+ /* The unit name and job result of the last Job message */
+ char *name;
+ char *result;
+
+ sd_bus_slot *slot_job_removed;
+ sd_bus_slot *slot_disconnected;
+} BusWaitForJobs;
+
+static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
+ assert(m);
+
+ log_error("Warning! D-Bus connection terminated.");
+ sd_bus_close(sd_bus_message_get_bus(m));
+
+ return 0;
+}
+
+static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
+ const char *path, *unit, *result;
+ BusWaitForJobs *d = userdata;
+ uint32_t id;
+ char *found;
+ int r;
+
+ assert(m);
+ assert(d);
+
+ r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
+ if (r < 0) {
+ bus_log_parse_error(r);
+ return 0;
+ }
+
+ found = set_remove(d->jobs, (char*) path);
+ if (!found)
+ return 0;
+
+ free(found);
+
+ (void) free_and_strdup(&d->result, empty_to_null(result));
+
+ (void) free_and_strdup(&d->name, empty_to_null(unit));
+
+ return 0;
+}
+
+void bus_wait_for_jobs_free(BusWaitForJobs *d) {
+ if (!d)
+ return;
+
+ set_free(d->jobs);
+
+ sd_bus_slot_unref(d->slot_disconnected);
+ sd_bus_slot_unref(d->slot_job_removed);
+
+ sd_bus_unref(d->bus);
+
+ free(d->name);
+ free(d->result);
+
+ free(d);
+}
+
+int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
+ _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
+ int r;
+
+ assert(bus);
+ assert(ret);
+
+ d = new(BusWaitForJobs, 1);
+ if (!d)
+ return -ENOMEM;
+
+ *d = (BusWaitForJobs) {
+ .bus = sd_bus_ref(bus),
+ };
+
+ /* When we are a bus client we match by sender. Direct
+ * connections OTOH have no initialized sender field, and
+ * hence we ignore the sender then */
+ r = sd_bus_match_signal_async(
+ bus,
+ &d->slot_job_removed,
+ bus->bus_client ? "org.freedesktop.systemd1" : NULL,
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ "JobRemoved",
+ match_job_removed, NULL, d);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_match_signal_async(
+ bus,
+ &d->slot_disconnected,
+ "org.freedesktop.DBus.Local",
+ NULL,
+ "org.freedesktop.DBus.Local",
+ "Disconnected",
+ match_disconnected, NULL, d);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(d);
+
+ return 0;
+}
+
+static int bus_process_wait(sd_bus *bus) {
+ int r;
+
+ for (;;) {
+ r = sd_bus_process(bus, NULL);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 0;
+
+ r = sd_bus_wait(bus, (uint64_t) -1);
+ if (r < 0)
+ return r;
+ }
+}
+
+static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
+ _cleanup_free_ char *dbus_path = NULL;
+
+ assert(d);
+ assert(d->name);
+ assert(result);
+
+ if (!endswith(d->name, ".service"))
+ return -EINVAL;
+
+ dbus_path = unit_dbus_path_from_name(d->name);
+ if (!dbus_path)
+ return -ENOMEM;
+
+ return sd_bus_get_property_string(d->bus,
+ "org.freedesktop.systemd1",
+ dbus_path,
+ "org.freedesktop.systemd1.Service",
+ "Result",
+ NULL,
+ result);
+}
+
+static void log_job_error_with_service_result(const char* service, const char *result, const char* const* extra_args) {
+ _cleanup_free_ char *service_shell_quoted = NULL;
+ const char *systemctl = "systemctl", *journalctl = "journalctl";
+
+ static const struct {
+ const char *result, *explanation;
+ } explanations[] = {
+ { "resources", "of unavailable resources or another system error" },
+ { "protocol", "the service did not take the steps required by its unit configuration" },
+ { "timeout", "a timeout was exceeded" },
+ { "exit-code", "the control process exited with error code" },
+ { "signal", "a fatal signal was delivered to the control process" },
+ { "core-dump", "a fatal signal was delivered causing the control process to dump core" },
+ { "watchdog", "the service failed to send watchdog ping" },
+ { "start-limit", "start of the service was attempted too often" }
+ };
+
+ assert(service);
+
+ service_shell_quoted = shell_maybe_quote(service, ESCAPE_BACKSLASH);
+
+ if (!strv_isempty((char**) extra_args)) {
+ _cleanup_free_ char *t;
+
+ t = strv_join((char**) extra_args, " ");
+ systemctl = strjoina("systemctl ", t ? : "<args>");
+ journalctl = strjoina("journalctl ", t ? : "<args>");
+ }
+
+ if (!isempty(result)) {
+ size_t i;
+
+ for (i = 0; i < ELEMENTSOF(explanations); ++i)
+ if (streq(result, explanations[i].result))
+ break;
+
+ if (i < ELEMENTSOF(explanations)) {
+ log_error("Job for %s failed because %s.\n"
+ "See \"%s status %s\" and \"%s -xe\" for details.\n",
+ service,
+ explanations[i].explanation,
+ systemctl,
+ service_shell_quoted ?: "<service>",
+ journalctl);
+ goto finish;
+ }
+ }
+
+ log_error("Job for %s failed.\n"
+ "See \"%s status %s\" and \"%s -xe\" for details.\n",
+ service,
+ systemctl,
+ service_shell_quoted ?: "<service>",
+ journalctl);
+
+finish:
+ /* For some results maybe additional explanation is required */
+ if (streq_ptr(result, "start-limit"))
+ log_info("To force a start use \"%1$s reset-failed %2$s\"\n"
+ "followed by \"%1$s start %2$s\" again.",
+ systemctl,
+ service_shell_quoted ?: "<service>");
+}
+
+static int check_wait_response(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
+ assert(d);
+ assert(d->name);
+ assert(d->result);
+
+ if (!quiet) {
+ if (streq(d->result, "canceled"))
+ log_error("Job for %s canceled.", strna(d->name));
+ else if (streq(d->result, "timeout"))
+ log_error("Job for %s timed out.", strna(d->name));
+ else if (streq(d->result, "dependency"))
+ log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
+ else if (streq(d->result, "invalid"))
+ log_error("%s is not active, cannot reload.", strna(d->name));
+ else if (streq(d->result, "assert"))
+ log_error("Assertion failed on job for %s.", strna(d->name));
+ else if (streq(d->result, "unsupported"))
+ log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
+ else if (streq(d->result, "collected"))
+ log_error("Queued job for %s was garbage collected.", strna(d->name));
+ else if (streq(d->result, "once"))
+ log_error("Unit %s was started already once and can't be started again.", strna(d->name));
+ else if (!STR_IN_SET(d->result, "done", "skipped")) {
+
+ if (d->name && endswith(d->name, ".service")) {
+ _cleanup_free_ char *result = NULL;
+ int q;
+
+ q = bus_job_get_service_result(d, &result);
+ if (q < 0)
+ log_debug_errno(q, "Failed to get Result property of unit %s: %m", d->name);
+
+ log_job_error_with_service_result(d->name, result, extra_args);
+ } else
+ log_error("Job failed. See \"journalctl -xe\" for details.");
+ }
+ }
+
+ if (STR_IN_SET(d->result, "canceled", "collected"))
+ return -ECANCELED;
+ else if (streq(d->result, "timeout"))
+ return -ETIME;
+ else if (streq(d->result, "dependency"))
+ return -EIO;
+ else if (streq(d->result, "invalid"))
+ return -ENOEXEC;
+ else if (streq(d->result, "assert"))
+ return -EPROTO;
+ else if (streq(d->result, "unsupported"))
+ return -EOPNOTSUPP;
+ else if (streq(d->result, "once"))
+ return -ESTALE;
+ else if (STR_IN_SET(d->result, "done", "skipped"))
+ return 0;
+
+ return log_debug_errno(SYNTHETIC_ERRNO(EIO),
+ "Unexpected job result, assuming server side newer than us: %s", d->result);
+}
+
+int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
+ int r = 0;
+
+ assert(d);
+
+ while (!set_isempty(d->jobs)) {
+ int q;
+
+ q = bus_process_wait(d->bus);
+ if (q < 0)
+ return log_error_errno(q, "Failed to wait for response: %m");
+
+ if (d->name && d->result) {
+ q = check_wait_response(d, quiet, extra_args);
+ /* Return the first error as it is most likely to be
+ * meaningful. */
+ if (q < 0 && r == 0)
+ r = q;
+
+ log_debug_errno(q, "Got result %s/%m for job %s", d->result, d->name);
+ }
+
+ d->name = mfree(d->name);
+ d->result = mfree(d->result);
+ }
+
+ return r;
+}
+
+int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
+ assert(d);
+
+ return set_put_strdup(&d->jobs, path);
+}
+
+int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
+ int r;
+
+ r = bus_wait_for_jobs_add(d, path);
+ if (r < 0)
+ return log_oom();
+
+ return bus_wait_for_jobs(d, quiet, NULL);
+}
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