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+# 2007 April 24
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+# This file implements tests to make sure SQLite treats a database
+# as readonly if its write version is set to  high.
+#
+# $Id: rdonly.test,v 1.2 2008/07/08 10:19:58 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Do not use a codec for tests in this file, as the database file is
+# manipulated directly using tcl scripts (using the [hexio_write] command).
+#
+do_not_use_codec
+
+# Create a database.
+#
+do_test rdonly-1.1 {
+  execsql {
+    CREATE TABLE t1(x);
+    INSERT INTO t1 VALUES(1);
+    SELECT * FROM t1;
+  }
+} {1}
+
+# EVIDENCE-OF: R-29639-16887 The sqlite3_db_readonly(D,N) interface
+# returns 1 if the database N of connection D is read-only, 0 if it is
+# read/write, or -1 if N is not the name of a database on connection D.
+#
+do_test rdonly-1.1.1 {
+  sqlite3_db_readonly db main
+} {0}
+
+# Changes the write version from 1 to 3.  Verify that the database
+# can be read but not written.
+#
+do_test rdonly-1.2 {
+  db close
+  hexio_get_int [hexio_read test.db 18 1]
+} 1
+do_test rdonly-1.3 {
+  hexio_write test.db 18 03
+  sqlite3 db test.db
+  execsql {
+    SELECT * FROM t1;
+  }
+} {1}
+do_test rdonly-1.3.1 {
+  sqlite3_db_readonly db main
+} {1}
+do_test rdonly-1.4 {
+  catchsql {
+    INSERT INTO t1 VALUES(2)
+  }
+} {1 {attempt to write a readonly database}}
+
+# Change the write version back to 1.  Verify that the database
+# is read-write again.
+#
+do_test rdonly-1.5 {
+  db close
+  hexio_write test.db 18 01
+  sqlite3 db test.db
+  catchsql {
+    INSERT INTO t1 VALUES(2);
+    SELECT * FROM t1;
+  }
+} {0 {1 2}}
+
+# Now, after connection [db] has loaded the database schema, modify the
+# write-version of the file (and the change-counter, so that the 
+# write-version is reloaded). This way, SQLite does not discover that
+# the database is read-only until after it is locked.
+#
+set ro_version 02
+ifcapable wal { set ro_version 03 }
+do_test rdonly-1.6 {
+  hexio_write test.db 18 $ro_version     ; # write-version
+  hexio_write test.db 24 11223344        ; # change-counter
+  catchsql {
+    INSERT INTO t1 VALUES(2);
+  }
+} {1 {attempt to write a readonly database}}
+
+finish_test