shaneh
117 lines
2.9 KiB
Tcl
117 lines
2.9 KiB
Tcl
# 2010 January 7
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements utility functions for SQLite library.
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#
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# This file attempts to restore the header of a journal.
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# This may be useful for rolling-back the last committed
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# transaction from a recovered journal.
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#
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# $Id: restore_jrnl.tcl,v 1.14 2009/07/11 06:55:34 danielk1977 Exp $
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package require sqlite3
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if { $argc != 2 } {
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puts "USAGE: restore_jrnl.tcl db_name jrnl_name"
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puts "Example: restore_jrnl.tcl foo.sqlite foo.sqlite-journal"
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return
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} else {
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set db_name [lindex $argv 0]
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set jrnl_name [lindex $argv 1]
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}
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# is there a way to determine this?
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set sectsz 512
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# Copy file $from into $to
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#
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proc copy_file {from to} {
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file copy -force $from $to
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}
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# Execute some SQL
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#
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proc catchsql {sql} {
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set rc [catch {uplevel [list db eval $sql]} msg]
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list $rc $msg
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}
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# Perform a test
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#
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proc do_test {name cmd expected} {
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puts -nonewline "$name ..."
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set res [uplevel $cmd]
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if {$res eq $expected} {
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puts Ok
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} else {
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puts Error
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puts " Got: $res"
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puts " Expected: $expected"
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}
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}
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# Setup for the tests. Make a backup copy of the files.
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#
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if [file exist $db_name.org] {
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puts "ERROR: during back-up: $db_name.org exists already."
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return;
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}
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if [file exist $jrnl_name.org] {
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puts "ERROR: during back-up: $jrnl_name.org exists already."
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return
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}
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copy_file $db_name $db_name.org
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copy_file $jrnl_name $jrnl_name.org
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set db_fsize [file size $db_name]
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sqlite3 db $db_name
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set db_pgsz [db eval {PRAGMA page_size}]
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db close
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set db_npage [expr {$db_fsize / $db_pgsz}]
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# restore in case get the page_size above changed things
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copy_file $db_name.org $db_name
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copy_file $jrnl_name.org $jrnl_name
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# calculate checksum nonce
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set pgno 0
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set pg_offset [expr $sectsz+((4+$db_pgsz+4)*$pgno)]
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set nonce [hexio_get_int [hexio_read $jrnl_name [expr $pg_offset+4+$db_pgsz] 4]]
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for {set i [expr $db_pgsz-200]} {$i>0} {set i [expr $i-200]} {
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set byte [hexio_get_int [hexio_read $jrnl_name [expr $pg_offset+4+$i] 1]]
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set nonce [expr $nonce-$byte]
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}
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# write the 8 byte magic string
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hexio_write $jrnl_name 0 d9d505f920a163d7
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# write -1 for number of records
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hexio_write $jrnl_name 8 ffffffff
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# write 00 for checksum nonce
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hexio_write $jrnl_name 12 [format %08x $nonce]
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# write page count
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hexio_write $jrnl_name 16 [format %08x $db_npage]
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# write sector size
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hexio_write $jrnl_name 20 [format %08x $sectsz]
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# write page size
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hexio_write $jrnl_name 24 [format %08x $db_pgsz]
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# check the integrity of the database.
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sqlite3 db $db_name
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do_test restore_jrnl-1.0 {
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catchsql {PRAGMA integrity_check}
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} {0 ok}
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db close
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