LCOV - code coverage report
Current view: top level - shared - bus-wait-for-jobs.c (source / functions) Hit Total Coverage
Test: systemd_full.info Lines: 0 164 0.0 %
Date: 2019-08-23 13:36:53 Functions: 0 11 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 192 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: LGPL-2.1+ */
       2                 :            : 
       3                 :            : #include "alloc-util.h"
       4                 :            : #include "bus-wait-for-jobs.h"
       5                 :            : #include "set.h"
       6                 :            : #include "bus-util.h"
       7                 :            : #include "bus-internal.h"
       8                 :            : #include "unit-def.h"
       9                 :            : #include "escape.h"
      10                 :            : #include "strv.h"
      11                 :            : 
      12                 :            : typedef struct BusWaitForJobs {
      13                 :            :         sd_bus *bus;
      14                 :            : 
      15                 :            :         /* The set of jobs to wait for, as bus object paths */
      16                 :            :         Set *jobs;
      17                 :            : 
      18                 :            :         /* The unit name and job result of the last Job message */
      19                 :            :         char *name;
      20                 :            :         char *result;
      21                 :            : 
      22                 :            :         sd_bus_slot *slot_job_removed;
      23                 :            :         sd_bus_slot *slot_disconnected;
      24                 :            : } BusWaitForJobs;
      25                 :            : 
      26                 :          0 : static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
      27         [ #  # ]:          0 :         assert(m);
      28                 :            : 
      29         [ #  # ]:          0 :         log_error("Warning! D-Bus connection terminated.");
      30                 :          0 :         sd_bus_close(sd_bus_message_get_bus(m));
      31                 :            : 
      32                 :          0 :         return 0;
      33                 :            : }
      34                 :            : 
      35                 :          0 : static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
      36                 :            :         const char *path, *unit, *result;
      37                 :          0 :         BusWaitForJobs *d = userdata;
      38                 :            :         uint32_t id;
      39                 :            :         char *found;
      40                 :            :         int r;
      41                 :            : 
      42         [ #  # ]:          0 :         assert(m);
      43         [ #  # ]:          0 :         assert(d);
      44                 :            : 
      45                 :          0 :         r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
      46         [ #  # ]:          0 :         if (r < 0) {
      47         [ #  # ]:          0 :                 bus_log_parse_error(r);
      48                 :          0 :                 return 0;
      49                 :            :         }
      50                 :            : 
      51                 :          0 :         found = set_remove(d->jobs, (char*) path);
      52         [ #  # ]:          0 :         if (!found)
      53                 :          0 :                 return 0;
      54                 :            : 
      55                 :          0 :         free(found);
      56                 :            : 
      57                 :          0 :         (void) free_and_strdup(&d->result, empty_to_null(result));
      58                 :            : 
      59                 :          0 :         (void) free_and_strdup(&d->name, empty_to_null(unit));
      60                 :            : 
      61                 :          0 :         return 0;
      62                 :            : }
      63                 :            : 
      64                 :          0 : void bus_wait_for_jobs_free(BusWaitForJobs *d) {
      65         [ #  # ]:          0 :         if (!d)
      66                 :          0 :                 return;
      67                 :            : 
      68                 :          0 :         set_free_free(d->jobs);
      69                 :            : 
      70                 :          0 :         sd_bus_slot_unref(d->slot_disconnected);
      71                 :          0 :         sd_bus_slot_unref(d->slot_job_removed);
      72                 :            : 
      73                 :          0 :         sd_bus_unref(d->bus);
      74                 :            : 
      75                 :          0 :         free(d->name);
      76                 :          0 :         free(d->result);
      77                 :            : 
      78                 :          0 :         free(d);
      79                 :            : }
      80                 :            : 
      81                 :          0 : int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
      82                 :          0 :         _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
      83                 :            :         int r;
      84                 :            : 
      85         [ #  # ]:          0 :         assert(bus);
      86         [ #  # ]:          0 :         assert(ret);
      87                 :            : 
      88                 :          0 :         d = new(BusWaitForJobs, 1);
      89         [ #  # ]:          0 :         if (!d)
      90                 :          0 :                 return -ENOMEM;
      91                 :            : 
      92                 :          0 :         *d = (BusWaitForJobs) {
      93                 :          0 :                 .bus = sd_bus_ref(bus),
      94                 :            :         };
      95                 :            : 
      96                 :            :         /* When we are a bus client we match by sender. Direct
      97                 :            :          * connections OTOH have no initialized sender field, and
      98                 :            :          * hence we ignore the sender then */
      99                 :          0 :         r = sd_bus_match_signal_async(
     100                 :            :                         bus,
     101                 :          0 :                         &d->slot_job_removed,
     102         [ #  # ]:          0 :                         bus->bus_client ? "org.freedesktop.systemd1" : NULL,
     103                 :            :                         "/org/freedesktop/systemd1",
     104                 :            :                         "org.freedesktop.systemd1.Manager",
     105                 :            :                         "JobRemoved",
     106                 :            :                         match_job_removed, NULL, d);
     107         [ #  # ]:          0 :         if (r < 0)
     108                 :          0 :                 return r;
     109                 :            : 
     110                 :          0 :         r = sd_bus_match_signal_async(
     111                 :            :                         bus,
     112                 :          0 :                         &d->slot_disconnected,
     113                 :            :                         "org.freedesktop.DBus.Local",
     114                 :            :                         NULL,
     115                 :            :                         "org.freedesktop.DBus.Local",
     116                 :            :                         "Disconnected",
     117                 :            :                         match_disconnected, NULL, d);
     118         [ #  # ]:          0 :         if (r < 0)
     119                 :          0 :                 return r;
     120                 :            : 
     121                 :          0 :         *ret = TAKE_PTR(d);
     122                 :            : 
     123                 :          0 :         return 0;
     124                 :            : }
     125                 :            : 
     126                 :          0 : static int bus_process_wait(sd_bus *bus) {
     127                 :            :         int r;
     128                 :            : 
     129                 :            :         for (;;) {
     130                 :          0 :                 r = sd_bus_process(bus, NULL);
     131         [ #  # ]:          0 :                 if (r < 0)
     132                 :          0 :                         return r;
     133         [ #  # ]:          0 :                 if (r > 0)
     134                 :          0 :                         return 0;
     135                 :            : 
     136                 :          0 :                 r = sd_bus_wait(bus, (uint64_t) -1);
     137         [ #  # ]:          0 :                 if (r < 0)
     138                 :          0 :                         return r;
     139                 :            :         }
     140                 :            : }
     141                 :            : 
     142                 :          0 : static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
     143                 :          0 :         _cleanup_free_ char *dbus_path = NULL;
     144                 :            : 
     145         [ #  # ]:          0 :         assert(d);
     146         [ #  # ]:          0 :         assert(d->name);
     147         [ #  # ]:          0 :         assert(result);
     148                 :            : 
     149         [ #  # ]:          0 :         if (!endswith(d->name, ".service"))
     150                 :          0 :                 return -EINVAL;
     151                 :            : 
     152                 :          0 :         dbus_path = unit_dbus_path_from_name(d->name);
     153         [ #  # ]:          0 :         if (!dbus_path)
     154                 :          0 :                 return -ENOMEM;
     155                 :            : 
     156                 :          0 :         return sd_bus_get_property_string(d->bus,
     157                 :            :                                           "org.freedesktop.systemd1",
     158                 :            :                                           dbus_path,
     159                 :            :                                           "org.freedesktop.systemd1.Service",
     160                 :            :                                           "Result",
     161                 :            :                                           NULL,
     162                 :            :                                           result);
     163                 :            : }
     164                 :            : 
     165                 :          0 : static void log_job_error_with_service_result(const char* service, const char *result, const char* const* extra_args) {
     166                 :          0 :         _cleanup_free_ char *service_shell_quoted = NULL;
     167                 :          0 :         const char *systemctl = "systemctl", *journalctl = "journalctl";
     168                 :            : 
     169                 :            :         static const struct {
     170                 :            :                 const char *result, *explanation;
     171                 :            :         } explanations[] = {
     172                 :            :                 { "resources",   "of unavailable resources or another system error" },
     173                 :            :                 { "protocol",    "the service did not take the steps required by its unit configuration" },
     174                 :            :                 { "timeout",     "a timeout was exceeded" },
     175                 :            :                 { "exit-code",   "the control process exited with error code" },
     176                 :            :                 { "signal",      "a fatal signal was delivered to the control process" },
     177                 :            :                 { "core-dump",   "a fatal signal was delivered causing the control process to dump core" },
     178                 :            :                 { "watchdog",    "the service failed to send watchdog ping" },
     179                 :            :                 { "start-limit", "start of the service was attempted too often" }
     180                 :            :         };
     181                 :            : 
     182         [ #  # ]:          0 :         assert(service);
     183                 :            : 
     184                 :          0 :         service_shell_quoted = shell_maybe_quote(service, ESCAPE_BACKSLASH);
     185                 :            : 
     186         [ #  # ]:          0 :         if (!strv_isempty((char**) extra_args)) {
     187                 :          0 :                 _cleanup_free_ char *t;
     188                 :            : 
     189                 :          0 :                 t = strv_join((char**) extra_args, " ");
     190   [ #  #  #  #  :          0 :                 systemctl = strjoina("systemctl ", t ? : "<args>");
          #  #  #  #  #  
             #  #  #  #  
                      # ]
     191   [ #  #  #  #  :          0 :                 journalctl = strjoina("journalctl ", t ? : "<args>");
          #  #  #  #  #  
             #  #  #  #  
                      # ]
     192                 :            :         }
     193                 :            : 
     194         [ #  # ]:          0 :         if (!isempty(result)) {
     195                 :            :                 size_t i;
     196                 :            : 
     197         [ #  # ]:          0 :                 for (i = 0; i < ELEMENTSOF(explanations); ++i)
     198         [ #  # ]:          0 :                         if (streq(result, explanations[i].result))
     199                 :          0 :                                 break;
     200                 :            : 
     201         [ #  # ]:          0 :                 if (i < ELEMENTSOF(explanations)) {
     202   [ #  #  #  # ]:          0 :                         log_error("Job for %s failed because %s.\n"
     203                 :            :                                   "See \"%s status %s\" and \"%s -xe\" for details.\n",
     204                 :            :                                   service,
     205                 :            :                                   explanations[i].explanation,
     206                 :            :                                   systemctl,
     207                 :            :                                   service_shell_quoted ?: "<service>",
     208                 :            :                                   journalctl);
     209                 :          0 :                         goto finish;
     210                 :            :                 }
     211                 :            :         }
     212                 :            : 
     213   [ #  #  #  # ]:          0 :         log_error("Job for %s failed.\n"
     214                 :            :                   "See \"%s status %s\" and \"%s -xe\" for details.\n",
     215                 :            :                   service,
     216                 :            :                   systemctl,
     217                 :            :                   service_shell_quoted ?: "<service>",
     218                 :            :                   journalctl);
     219                 :            : 
     220                 :          0 : finish:
     221                 :            :         /* For some results maybe additional explanation is required */
     222         [ #  # ]:          0 :         if (streq_ptr(result, "start-limit"))
     223   [ #  #  #  # ]:          0 :                 log_info("To force a start use \"%1$s reset-failed %2$s\"\n"
     224                 :            :                          "followed by \"%1$s start %2$s\" again.",
     225                 :            :                          systemctl,
     226                 :            :                          service_shell_quoted ?: "<service>");
     227                 :          0 : }
     228                 :            : 
     229                 :          0 : static int check_wait_response(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
     230         [ #  # ]:          0 :         assert(d);
     231         [ #  # ]:          0 :         assert(d->name);
     232         [ #  # ]:          0 :         assert(d->result);
     233                 :            : 
     234         [ #  # ]:          0 :         if (!quiet) {
     235         [ #  # ]:          0 :                 if (streq(d->result, "canceled"))
     236         [ #  # ]:          0 :                         log_error("Job for %s canceled.", strna(d->name));
     237         [ #  # ]:          0 :                 else if (streq(d->result, "timeout"))
     238         [ #  # ]:          0 :                         log_error("Job for %s timed out.", strna(d->name));
     239         [ #  # ]:          0 :                 else if (streq(d->result, "dependency"))
     240         [ #  # ]:          0 :                         log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
     241         [ #  # ]:          0 :                 else if (streq(d->result, "invalid"))
     242         [ #  # ]:          0 :                         log_error("%s is not active, cannot reload.", strna(d->name));
     243         [ #  # ]:          0 :                 else if (streq(d->result, "assert"))
     244         [ #  # ]:          0 :                         log_error("Assertion failed on job for %s.", strna(d->name));
     245         [ #  # ]:          0 :                 else if (streq(d->result, "unsupported"))
     246         [ #  # ]:          0 :                         log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
     247         [ #  # ]:          0 :                 else if (streq(d->result, "collected"))
     248         [ #  # ]:          0 :                         log_error("Queued job for %s was garbage collected.", strna(d->name));
     249         [ #  # ]:          0 :                 else if (streq(d->result, "once"))
     250         [ #  # ]:          0 :                         log_error("Unit %s was started already once and can't be started again.", strna(d->name));
     251         [ #  # ]:          0 :                 else if (!STR_IN_SET(d->result, "done", "skipped")) {
     252                 :            : 
     253   [ #  #  #  # ]:          0 :                         if (d->name && endswith(d->name, ".service")) {
     254                 :          0 :                                 _cleanup_free_ char *result = NULL;
     255                 :            :                                 int q;
     256                 :            : 
     257                 :          0 :                                 q = bus_job_get_service_result(d, &result);
     258         [ #  # ]:          0 :                                 if (q < 0)
     259         [ #  # ]:          0 :                                         log_debug_errno(q, "Failed to get Result property of unit %s: %m", d->name);
     260                 :            : 
     261                 :          0 :                                 log_job_error_with_service_result(d->name, result, extra_args);
     262                 :            :                         } else
     263         [ #  # ]:          0 :                                 log_error("Job failed. See \"journalctl -xe\" for details.");
     264                 :            :                 }
     265                 :            :         }
     266                 :            : 
     267         [ #  # ]:          0 :         if (STR_IN_SET(d->result, "canceled", "collected"))
     268                 :          0 :                 return -ECANCELED;
     269         [ #  # ]:          0 :         else if (streq(d->result, "timeout"))
     270                 :          0 :                 return -ETIME;
     271         [ #  # ]:          0 :         else if (streq(d->result, "dependency"))
     272                 :          0 :                 return -EIO;
     273         [ #  # ]:          0 :         else if (streq(d->result, "invalid"))
     274                 :          0 :                 return -ENOEXEC;
     275         [ #  # ]:          0 :         else if (streq(d->result, "assert"))
     276                 :          0 :                 return -EPROTO;
     277         [ #  # ]:          0 :         else if (streq(d->result, "unsupported"))
     278                 :          0 :                 return -EOPNOTSUPP;
     279         [ #  # ]:          0 :         else if (streq(d->result, "once"))
     280                 :          0 :                 return -ESTALE;
     281         [ #  # ]:          0 :         else if (STR_IN_SET(d->result, "done", "skipped"))
     282                 :          0 :                 return 0;
     283                 :            : 
     284         [ #  # ]:          0 :         return log_debug_errno(SYNTHETIC_ERRNO(EIO),
     285                 :            :                                "Unexpected job result, assuming server side newer than us: %s", d->result);
     286                 :            : }
     287                 :            : 
     288                 :          0 : int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char* const* extra_args) {
     289                 :          0 :         int r = 0;
     290                 :            : 
     291         [ #  # ]:          0 :         assert(d);
     292                 :            : 
     293         [ #  # ]:          0 :         while (!set_isempty(d->jobs)) {
     294                 :            :                 int q;
     295                 :            : 
     296                 :          0 :                 q = bus_process_wait(d->bus);
     297         [ #  # ]:          0 :                 if (q < 0)
     298         [ #  # ]:          0 :                         return log_error_errno(q, "Failed to wait for response: %m");
     299                 :            : 
     300   [ #  #  #  # ]:          0 :                 if (d->name && d->result) {
     301                 :          0 :                         q = check_wait_response(d, quiet, extra_args);
     302                 :            :                         /* Return the first error as it is most likely to be
     303                 :            :                          * meaningful. */
     304   [ #  #  #  # ]:          0 :                         if (q < 0 && r == 0)
     305                 :          0 :                                 r = q;
     306                 :            : 
     307         [ #  # ]:          0 :                         log_debug_errno(q, "Got result %s/%m for job %s", d->result, d->name);
     308                 :            :                 }
     309                 :            : 
     310                 :          0 :                 d->name = mfree(d->name);
     311                 :          0 :                 d->result = mfree(d->result);
     312                 :            :         }
     313                 :            : 
     314                 :          0 :         return r;
     315                 :            : }
     316                 :            : 
     317                 :          0 : int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
     318                 :            :         int r;
     319                 :            : 
     320         [ #  # ]:          0 :         assert(d);
     321                 :            : 
     322                 :          0 :         r = set_ensure_allocated(&d->jobs, &string_hash_ops);
     323         [ #  # ]:          0 :         if (r < 0)
     324                 :          0 :                 return r;
     325                 :            : 
     326                 :          0 :         return set_put_strdup(d->jobs, path);
     327                 :            : }
     328                 :            : 
     329                 :          0 : int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
     330                 :            :         int r;
     331                 :            : 
     332                 :          0 :         r = bus_wait_for_jobs_add(d, path);
     333         [ #  # ]:          0 :         if (r < 0)
     334                 :          0 :                 return log_oom();
     335                 :            : 
     336                 :          0 :         return bus_wait_for_jobs(d, quiet, NULL);
     337                 :            : }

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