| # 2012 January 12 |
| # |
| # 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. |
| # |
| #*********************************************************************** |
| # |
| |
| set testdir [file dirname $argv0] |
| source $testdir/tester.tcl |
| set testprefix corruptF |
| |
| # 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 |
| |
| # These tests deal with corrupt database files |
| # |
| database_may_be_corrupt |
| |
| proc str {i} { format %08d $i } |
| |
| # Create a 6 page database containing a single table - t1. Table t1 |
| # consists of page 2 (the root page) and pages 5 and 6 (leaf pages). |
| # Database pages 3 and 4 are on the free list. |
| # |
| proc create_test_db {} { |
| catch { db close } |
| forcedelete test.db |
| sqlite3 db test.db |
| db func str str |
| execsql { |
| PRAGMA auto_vacuum = 0; |
| PRAGMA page_size = 1024; |
| CREATE TABLE t1(x); /* root page = 2 */ |
| CREATE TABLE t2(x); /* root page = 3 */ |
| CREATE TABLE t3(x); /* root page = 4 */ |
| |
| INSERT INTO t1 VALUES(str(1)); |
| INSERT INTO t1 SELECT str(rowid+1) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+2) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+4) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+8) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+16) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+32) FROM t1; |
| INSERT INTO t1 SELECT str(rowid+64) FROM t1; |
| DROP TABLE t2; |
| DROP TABLE t3; |
| } |
| db close |
| } |
| |
| do_test 1.1 { create_test_db } {} |
| |
| # Check the db is as we expect. 6 pages in total, with 3 and 4 on the free |
| # list. Page 3 is the free list trunk and page 4 is a leaf. |
| # |
| do_test 1.2 { file size test.db } [expr 6*1024] |
| do_test 1.3 { hexio_read test.db 32 4 } 00000003 |
| do_test 1.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004 |
| |
| # Change the free-list entry to page 6 and reopen the db file. |
| do_test 1.5 { |
| hexio_write test.db [expr 2*1024 + 8] 00000006 |
| sqlite3 db test.db |
| } {} |
| |
| # Now create a new table in the database file. The root of the new table |
| # is page 6, which is also the right-most leaf page in table t1. |
| # |
| do_execsql_test 1.6 { |
| CREATE TABLE t4(x); |
| SELECT * FROM sqlite_master; |
| } { |
| table t1 t1 2 {CREATE TABLE t1(x)} |
| table t4 t4 6 {CREATE TABLE t4(x)} |
| } |
| |
| # At one point this was causing an assert to fail. |
| # |
| # This statement opens a cursor on table t1 and does a full table scan. As |
| # each row is visited, it is copied into table t4. There is no temporary |
| # table. |
| # |
| # When the t1 cursor reaches page 6 (which is both the right-most leaf of |
| # t1 and the root of t4), it continues to iterate through the keys within |
| # it (which at this point are keys that have been inserted into t4). And |
| # for each row visited, another row is inserted into page 6 - it being the |
| # root page of t4. Eventually, page 6 becomes full and the height of the |
| # b-tree for table t4 increased. From the point of view of the t1 cursor, |
| # this unexpectedly reduces the number of keys on page 6 in the middle of |
| # its iteration, which causes an assert() to fail. |
| # |
| db_save_and_close |
| if 1 { |
| for {set i 0} {$i < 128} {incr i} { |
| db_restore_and_reopen |
| do_test 1.7.$i { |
| set res [ |
| catchsql { INSERT INTO t4 SELECT x FROM t1 WHERE rowid>$i } |
| ] |
| if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} { |
| set res "" |
| } |
| set res |
| } {} |
| } |
| } |
| |
| do_test 2.1 { create_test_db } {} |
| do_test 2.2 { file size test.db } [expr 6*1024] |
| do_test 2.3 { hexio_read test.db 32 4 } 00000003 |
| do_test 2.4 { hexio_read test.db [expr 2*1024] 12 } 000000000000000100000004 |
| |
| # Change the free-list entry to page 5 and reopen the db file. |
| do_test 2.5 { |
| hexio_write test.db [expr 2*1024 + 8] 00000005 |
| sqlite3 db test.db |
| } {} |
| |
| # Now create a new table in the database file. The root of the new table |
| # is page 5, which is also the right-most leaf page in table t1. |
| # |
| do_execsql_test 2.6 { |
| CREATE TABLE t4(x); |
| SELECT * FROM sqlite_master; |
| } { |
| table t1 t1 2 {CREATE TABLE t1(x)} |
| table t4 t4 5 {CREATE TABLE t4(x)} |
| } |
| |
| db_save_and_close |
| for {set i 127} {$i >= 0} {incr i -1} { |
| db_restore_and_reopen |
| do_test 2.7.$i { |
| set res [ |
| catchsql { |
| INSERT INTO t4 SELECT x FROM t1 WHERE rowid<$i ORDER BY rowid DESC |
| } |
| ] |
| if {$res == "0 {}" || $res == "1 {database disk image is malformed}"} { |
| set res "" |
| } |
| set res |
| } {} |
| } |
| |
| finish_test |