udevd: event - don't log about failures of spawn processes when this is expected

PROGRAM and IMPORT{program} uses the exit code of the spawn process to decide if a rule matches or not,
a failing process is hence normal operation and not something we should warn about.

We still warn about other types of failing processes.

3 files changed, 18 insertions, 12 deletions

diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
index 8d17c5e1e3..cc97a8867e 100644
--- a/src/udev/udev-event.c
+++ b/src/udev/udev-event.c
@@ -42,6 +42,7 @@ typedef struct Spawn {
         pid_t pid;
         usec_t timeout_warn;
         usec_t timeout;
+        bool accept_failure;
 } Spawn;
 
 struct udev_event *udev_event_new(struct udev_device *dev) {
@@ -583,23 +584,24 @@ static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userd
 
         switch (si->si_code) {
         case CLD_EXITED:
-                if (si->si_status != 0)
-                        log_warning("process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
-                else {
-                        log_debug("process '%s' succeeded.", spawn->cmd);
+                if (si->si_status == 0) {
+                        log_debug("Process '%s' succeeded.", spawn->cmd);
                         sd_event_exit(sd_event_source_get_event(s), 0);
 
                         return 1;
-                }
+                } else if (spawn->accept_failure)
+                        log_debug("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
+                else
+                        log_warning("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
 
                 break;
         case CLD_KILLED:
         case CLD_DUMPED:
-                log_warning("process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
+                log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
 
                 break;
         default:
-                log_error("process '%s' failed due to unknown reason.", spawn->cmd);
+                log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
         }
 
         sd_event_exit(sd_event_source_get_event(s), -EIO);
@@ -610,10 +612,12 @@ static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userd
 static int spawn_wait(struct udev_event *event,
                       usec_t timeout_usec,
                       usec_t timeout_warn_usec,
-                      const char *cmd, pid_t pid) {
+                      const char *cmd, pid_t pid,
+                      bool accept_failure) {
         Spawn spawn = {
                 .cmd = cmd,
                 .pid = pid,
+                .accept_failure = accept_failure,
         };
         _cleanup_event_unref_ sd_event *e = NULL;
         int r, ret;
@@ -698,6 +702,7 @@ out:
 int udev_event_spawn(struct udev_event *event,
                      usec_t timeout_usec,
                      usec_t timeout_warn_usec,
+                     bool accept_failure,
                      const char *cmd, char **envp,
                      char *result, size_t ressize) {
         int outpipe[2] = {-1, -1};
@@ -773,7 +778,7 @@ int udev_event_spawn(struct udev_event *event,
                            outpipe[READ_END], errpipe[READ_END],
                            result, ressize);
 
-                err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid);
+                err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid, accept_failure);
         }
 
 out:
@@ -930,7 +935,7 @@ void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_
 
                         udev_event_apply_format(event, cmd, program, sizeof(program));
                         envp = udev_device_get_properties_envp(event->dev);
-                        udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, NULL, 0);
+                        udev_event_spawn(event, timeout_usec, timeout_warn_usec, false, program, envp, NULL, 0);
                 }
         }
 }
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 7be9a2311a..8ebc061eb1 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -641,7 +641,7 @@ static int import_program_into_properties(struct udev_event *event,
         int err;
 
         envp = udev_device_get_properties_envp(dev);
-        err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, result, sizeof(result));
+        err = udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, envp, result, sizeof(result));
         if (err < 0)
                 return err;
 
@@ -2131,7 +2131,7 @@ int udev_rules_apply_to_event(struct udev_rules *rules,
                                   rules_str(rules, rule->rule.filename_off),
                                   rule->rule.filename_line);
 
-                        if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, result, sizeof(result)) < 0) {
+                        if (udev_event_spawn(event, timeout_usec, timeout_warn_usec, true, program, envp, result, sizeof(result)) < 0) {
                                 if (cur->key.op != OP_NOMATCH)
                                         goto nomatch;
                         } else {
diff --git a/src/udev/udev.h b/src/udev/udev.h
index fd8504c424..4d22f2377e 100644
--- a/src/udev/udev.h
+++ b/src/udev/udev.h
@@ -84,6 +84,7 @@ int udev_event_apply_subsys_kernel(struct udev_event *event, const char *string,
 int udev_event_spawn(struct udev_event *event,
                      usec_t timeout_usec,
                      usec_t timeout_warn_usec,
+                     bool accept_failure,
                      const char *cmd, char **envp,
                      char *result, size_t ressize);
 void udev_event_execute_rules(struct udev_event *event,