Extend the innodb.log_corruption test.

Remove the dependency on unzip. Instead, generate the InnoDB files
with perl.

log_block_checksum_is_ok(): Correct the error message.

recv_scan_log_recs(): Remove the duplicated error message for
log block checksum mismatch.

innobase_start_or_create_for_mysql(): If the server is in read-only
mode or if innodb_force_recovery>=3, do not try to modify the system
tablespace. (If the doublewrite buffer or the non-core system tables
do not exist, do not try to create them.)

innodb_shutdown(): Relax a debug assertion. If the system tablespace
did not contain a doublewrite buffer and if we started up in
innodb_read_only mode or with innodb_force_recovery>=3, it will not
be created.

dict_create_or_check_sys_tablespace(): Set the flag
srv_sys_tablespaces_open when the tables exist.

Author: dr-m

mysql-test/include/have_unzip.inc

@@ -68,8 +68,6 @@ sub skip_combinations {
     unless $::mysqld_variables{'version-ssl-library'} =~ /OpenSSL (\S+)/
        and $1 ge "1.0.1d";
 
-  $skip{'include/have_unzip.inc'} = 'no unzip executable' unless `unzip`;
-
   %skip;
 }
 

mysql-test/suite.pm

@@ -11,7 +11,9 @@
 # Test a corrupted MLOG_FILE_NAME record.
 # valid header, valid checkpoint 1, all-zero (invalid) checkpoint 2
 # Test a corrupted MLOG_FILE_NAME record.
-# valid header, invalid checkpoint 1, valid checkpoint 2
+# valid header, invalid checkpoint 1, valid checkpoint 2, invalid block
+# valid header, invalid checkpoint 1, valid checkpoint 2, invalid log record
+ib_buffer_pool
 ib_logfile0
 ib_logfile1
 ibdata1