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Simplify TAP tests of kerberos with expected log file contents

The TAP tests of kerberos rely on the logs generated by the backend tocheck various connection scenarios. In order to make sure that a giventest does not overlap with the log contents generated by a previoustest, the test suite relied on a logic with the logging collector and arotation of the log files to ensure the uniqueness of the log generatedwith a wait phase.Parsing the log contents for expected patterns is a problem that hasbeen solved in a simpler way by PostgresNode::issues_sql_like() wherethe log file is truncated before checking for the contents generated,with the backend sending its output to a log file given by pg_ctlinstead. This commit switches the kerberos test suite to use such amethod, removing any wait phase and simplifying the whole logic,resulting in less code. If a failure happens in the tests, the contentsof the logs are still showed to the user at the moment of the failurethanks to like(), so this has no impact on debugging capabilities.I have bumped into this issue while reviewing a different patch setaiming at extending the kerberos test suite to check for multiplelog patterns instead of one now.Author: Michael PaquierReviewed-by: Stephen Frost, Bharath RupireddyDiscussion:https://postgr.es/m/YFXcq2vBTDGQVBNC@paquier.xyz

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src/test/kerberos/t
- 001_auth.pl

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`‎src/test/kerberos/t/001_auth.pl`

Lines changed: 5 additions & 22 deletions

Original file line number	Diff line number	Diff line change
`@@ -20,7 +20,7 @@`
`20`	`20`
`21`	`21`	`if ($ENV{with_gssapi}eq'yes')`
`22`	`22`	`{`
`23`		`-plantests=>34;`
	`23`	`+plantests=>26;`
`24`	`24`	`}`
`25`	`25`	`else`
`26`	`26`	`{`
`@@ -170,10 +170,7 @@ END`
`170`	`170`	`'postgresql.conf',qq{`
`171`	`171`	`listen_addresses = '$hostaddr'`
`172`	`172`	`krb_server_keyfile = '$keytab'`
`173`		`-logging_collector = on`
`174`	`173`	`log_connections = on`
`175`		`-# these ensure stability of test results:`
`176`		`-log_rotation_age = 0`
`177`	`174`	`lc_messages = 'C'`
`178`	`175`	`});`
`179`	`176`	`$node->start;`
`@@ -212,29 +209,15 @@ sub test_access`
`212`	`209`	`# Verify specified log message is logged in the log file.`
`213`	`210`	`if ($expect_log_msgne'')`
`214`	`211`	`{`
`215`		`-my$current_logfiles = slurp_file($node->data_dir .'/current_logfiles');`
`216`		`-note"current_logfiles =$current_logfiles";`
`217`		`-like($current_logfiles,qr\|^stderr log/postgresql-.*log$\|,`
`218`		`-'current_logfiles is sane');`
`219`		`-`
`220`		`-my$lfname =$current_logfiles;`
`221`		`-$lfname =~s/^stderr//;`
`222`		`-chomp$lfname;`
`223`		`-`
`224`		`-# might need to retry if logging collector process is slow...`
`225`		`-my$max_attempts = 180 * 10;`
`226`		`-my$first_logfile;`
`227`		`-for (my$attempts = 0;$attempts <$max_attempts;$attempts++)`
`228`		`-{`
`229`		`-$first_logfile = slurp_file($node->data_dir .'/' .$lfname);`
`230`		`-lastif$first_logfile =~m/\Q$expect_log_msg\E/;`
`231`		`-usleep(100_000);`
`232`		`-}`
	`212`	`+my$first_logfile = slurp_file($node->logfile);`
`233`	`213`
`234`	`214`	`like($first_logfile,qr/\Q$expect_log_msg\E/,`
`235`	`215`	`'found expected log file content');`
`236`	`216`	`}`
`237`	`217`
	`218`	`+# Clean up any existing contents in the node's log file so as`
	`219`	`+# future tests don't step on each other's generated contents.`
	`220`	`+truncate$node->logfile, 0;`
`238`	`221`	`return;`
`239`	`222`	`}`
`240`	`223`

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`‎src/test/kerberos/t/001_auth.pl`

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