Ensure no user checkpoint

src/leader.c

@@ -84,8 +84,7 @@ static int openConnection(const char *filename,
 		goto err;
 	}
 
-	rc = sqlite3_exec(*conn, "PRAGMA wal_autocheckpoint=0", NULL, NULL,
-			  &msg);
+	rc = sqlite3_wal_autocheckpoint(*conn, 0);
 	if (rc != SQLITE_OK) {
 		tracef("wal autocheckpoint off failed %d", rc);
 		goto err;

src/vfs.c

@@ -1241,7 +1241,7 @@ static int vfsFileControlPragma(struct vfsFile *f, char **fnctl)
 
 	assert(left != NULL);
 
-	if (strcmp(left, "page_size") == 0 && right) {
+	if (sqlite3_stricmp(left, "page_size") == 0 && right) {
 		/* When the user executes 'PRAGMA page_size=N' we save the
 		 * size internally.
 		 *
@@ -1266,14 +1266,18 @@ static int vfsFileControlPragma(struct vfsFile *f, char **fnctl)
 				return SQLITE_IOERR;
 			}
 		}
-	} else if (strcmp(left, "journal_mode") == 0 && right) {
+	} else if (sqlite3_stricmp(left, "journal_mode") == 0 && right) {
 		/* When the user executes 'PRAGMA journal_mode=x' we ensure
 		 * that the desired mode is 'wal'. */
 		if (strcasecmp(right, "wal") != 0) {
 			fnctl[0] =
 			    sqlite3_mprintf("only WAL mode is supported");
 			return SQLITE_IOERR;
 		}
+	} else if (sqlite3_stricmp(left, "wal_checkpoint") == 0 
+			|| (sqlite3_stricmp(left, "wal_autocheckpoint") == 0 && right)) {
+		fnctl[0] = sqlite3_mprintf("custom checkpoint not allowed");
+		return SQLITE_IOERR;
 	}
 
 	/* We're returning NOTFOUND here to tell SQLite that we wish it to go on