udevadm-settle: improve logs when we cannot access /run/udev/control

Addresses https://github.com/systemd/systemd/pull/24474#discussion_r959696663.

diff --git a/src/udev/udevadm-settle.c b/src/udev/udevadm-settle.c
index 9de25ae678000384053fe5c0bfda25a1c295de2f..f093b7cbe8acd099009774f6c8cf76afe78e0fe1 100644 (file)
--- a/src/udev/udevadm-settle.c
+++ b/src/udev/udevadm-settle.c
@@ -217,8 +217,11 @@ int settle_main(int argc, char *argv[], void *userdata) {
                         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)
-                        return log_error_errno(errno, "udevd is not 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);