Fix GUC's reports of assign_hook failure to always include the parameter value

we failed to assign, even in "can't happen" cases.  Motivated by wondering
what's going on in a recent trouble report where "failed to commit" did
happen.

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index b1c6e855dc90780ede867f4737c03133aca9c1bd..0cc680a7fed7d6baa745f83f3ae6e91f91701e4a 100644 (file)
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -3327,7 +3327,8 @@ ResetAllOptions(void)
                                        if (conf->assign_hook)
                                                if (!(*conf->assign_hook) (conf->reset_val, true,
                                                                                                   PGC_S_SESSION))
-                                                       elog(ERROR, "failed to reset %s", conf->gen.name);
+                                                       elog(ERROR, "failed to reset %s to %d",
+                                                                conf->gen.name, (int) conf->reset_val);
                                        *conf->variable = conf->reset_val;
                                        conf->gen.source = conf->gen.reset_source;
                                        break;
@@ -3339,7 +3340,8 @@ ResetAllOptions(void)
                                        if (conf->assign_hook)
                                                if (!(*conf->assign_hook) (conf->reset_val, true,
                                                                                                   PGC_S_SESSION))
-                                                       elog(ERROR, "failed to reset %s", conf->gen.name);
+                                                       elog(ERROR, "failed to reset %s to %d",
+                                                                conf->gen.name, conf->reset_val);
                                        *conf->variable = conf->reset_val;
                                        conf->gen.source = conf->gen.reset_source;
                                        break;
@@ -3351,7 +3353,8 @@ ResetAllOptions(void)
                                        if (conf->assign_hook)
                                                if (!(*conf->assign_hook) (conf->reset_val, true,
                                                                                                   PGC_S_SESSION))
-                                                       elog(ERROR, "failed to reset %s", conf->gen.name);
+                                                       elog(ERROR, "failed to reset %s to %g",
+                                                                conf->gen.name, conf->reset_val);
                                        *conf->variable = conf->reset_val;
                                        conf->gen.source = conf->gen.reset_source;
                                        break;
@@ -3371,7 +3374,8 @@ ResetAllOptions(void)
                                                newstr = (*conf->assign_hook) (str, true,
                                                                                                           PGC_S_SESSION);
                                                if (newstr == NULL)
-                                                       elog(ERROR, "failed to reset %s", conf->gen.name);
+                                                       elog(ERROR, "failed to reset %s to \"%s\"",
+                                                                conf->gen.name, str);
                                                else if (newstr != str)
                                                {
                                                        /*
@@ -3650,8 +3654,8 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
                                                                if (conf->assign_hook)
                                                                        if (!(*conf->assign_hook) (newval,
                                                                                                           true, PGC_S_OVERRIDE))
-                                                                               elog(LOG, "failed to commit %s",
-                                                                                        conf->gen.name);
+                                                                               elog(LOG, "failed to commit %s as %d",
+                                                                                        conf->gen.name, (int) newval);
                                                                *conf->variable = newval;
                                                                changed = true;
                                                        }
@@ -3667,8 +3671,8 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
                                                                if (conf->assign_hook)
                                                                        if (!(*conf->assign_hook) (newval,
                                                                                                           true, PGC_S_OVERRIDE))
-                                                                               elog(LOG, "failed to commit %s",
-                                                                                        conf->gen.name);
+                                                                               elog(LOG, "failed to commit %s as %d",
+                                                                                        conf->gen.name, newval);
                                                                *conf->variable = newval;
                                                                changed = true;
                                                        }
@@ -3684,8 +3688,8 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
                                                                if (conf->assign_hook)
                                                                        if (!(*conf->assign_hook) (newval,
                                                                                                           true, PGC_S_OVERRIDE))
-                                                                               elog(LOG, "failed to commit %s",
-                                                                                        conf->gen.name);
+                                                                               elog(LOG, "failed to commit %s as %g",
+                                                                                        conf->gen.name, newval);
                                                                *conf->variable = newval;
                                                                changed = true;
                                                        }
@@ -3705,8 +3709,8 @@ AtEOXact_GUC(bool isCommit, int nestLevel)
                                                                        newstr = (*conf->assign_hook) (newval, true,
                                                                                                                         PGC_S_OVERRIDE);
                                                                        if (newstr == NULL)
-                                                                               elog(LOG, "failed to commit %s",
-                                                                                        conf->gen.name);
+                                                                               elog(LOG, "failed to commit %s as \"%s\"",
+                                                                                        conf->gen.name, newval);
                                                                        else if (newstr != newval)
                                                                        {
                                                                                /*