report stat() error in trigger file check

Permissions might prevent the existence of the trigger file from being
checked.

Per report from Andres Freund

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 0106cdf63804e9d231b14a3ca699b6311d8f507d..88ad51f9e7d9252e78a8a73fd1cb2abf93a946da 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -11102,6 +11102,12 @@ CheckForStandbyTrigger(void)
        fast_promote = true;
        return true;
    }
+   else if (errno != ENOENT)
+       ereport(ERROR,
+               (errcode_for_file_access(),
+                errmsg("could not stat trigger file \"%s\": %m",
+                       TriggerFile)));
+
    return false;
 }