Horton

Re: pg_amcheck contrib application

Mark Dilger <mark.dilger@enterprisedb.com>

View thread View on postgr.es
From: Mark Dilger <mark.dilger@enterprisedb.com>
To: Noah Misch <noah@leadboat.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Peter Geoghegan <pg@bowt.ie>, Thomas Munro <thomas.munro@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, "Andrey M. Borodin" <x4mmm@yandex-team.ru>, Stephen Frost <sfrost@snowman.net>, Michael Paquier <michael@paquier.xyz>, Amul Sul <sulamul@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Andres Freund <andres@anarazel.de>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2021-03-13T18:51:27Z
Lists: pgsql-hackers 

> On Mar 13, 2021, at 10:46 AM, Noah Misch <noah@leadboat.com> wrote:
> 
> On Fri, Mar 12, 2021 at 05:04:09PM -0800, Mark Dilger wrote:
>>> On Mar 12, 2021, at 3:24 PM, Mark Dilger <mark.dilger@enterprisedb.com> wrote:
>>> 
>>> and the second deals with an apparent problem with IPC::Run shell expanding an asterisk on some platforms but not others.  That second one, if true, seems like a problem with scope beyond the pg_amcheck project, as TestLib::command_checks_all uses IPC::Run, and it would be desirable to have consistent behavior across platforms.
> 
>>> One of pg_amcheck's regression tests was passing an asterisk through
>>> TestLib's command_checks_all() command, which gets through to
>>> pg_amcheck without difficulty on most platforms, but appears to get
>>> shell expanded on Windows (jacana) and AIX (hoverfly).
> 
> For posterity, I can't reproduce this on hoverfly.  The suite fails the same
> way at f371a4c and f371a4c^.  More-recently (commit 58f5749), the suite passes
> even after reverting f371a4c.  Self-contained IPC::Run usage also does not
> corroborate the theory:
> 
> [nm@power8-aix 8:0 2021-03-13T18:32:23 clean 0]$ perl -MIPC::Run -e 'IPC::Run::run "printf", "%s\n", "*"'
> *
> [nm@power8-aix 8:0 2021-03-13T18:32:29 clean 0]$ perl -MIPC::Run -e 'IPC::Run::run "sh", "-c", "printf %s\\\\n *"'
> COPYRIGHT
> GNUmakefile.in
> HISTORY
> Makefile
> README
> README.git
> aclocal.m4
> config
> configure
> configure.ac
> contrib
> doc
> src
> 
>> there is a similar symptom caused by an unrelated problem
> 
>> Subject: [PATCH v3] Avoid use of non-portable option ordering in
>> command_checks_all().
> 
> On a glibc system, "env POSIXLY_CORRECT=1 make check ..." tests this.

Thanks for investigating!

The reason I suspected that passing the '*' through IPC::Run had to do with the error that pg_amcheck gave.  It complained that too many arguments where being passed to it, and that the first such argument was "pg_amcheck.c".  There's no reason pg_amcheck should know it's source file name, nor that the regression test should know that, which suggested that the asterisk was being shell expanded within the src/bin/pg_amcheck/ directory and the file listing was being passed into pg_amcheck as arguments.

That theory may have been wrong, but it was the only theory I had at the time.  I don't have access to any of the machines where that happened, so it is hard for me to investigate further.

—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Commits

  1. amcheck: Improve some confusing reports about TOAST problems.

  2. amcheck: Reword some messages and fix an alignment problem.

  3. amcheck: fix multiple problems with TOAST pointer validation

  4. amcheck: Remove duplicate XID/MXID bounds checks.

  5. amcheck: Fix verify_heapam's tuple visibility checking rules.

  6. nbtree VACUUM: Cope with buggy opclasses.

  7. Improve pg_amcheck's TAP test 003_check.pl.

  8. Fix a confusing amcheck corruption message.

  9. Doc: add note about how to run the pg_amcheck regression tests.

  10. In pg_amcheck tests, don't depend on perl's Q/q pack code.

  11. pg_amcheck: Keep trying to fix the tests.

  12. pg_amcheck: Try to fix still more test failures.

  13. Try to avoid apparent platform-dependency in IPC::Run

  14. Fix portability issues in pg_amcheck's 004_verify_heapam.pl.

  15. Try to fix compiler warnings.

  16. Add pg_amcheck, a CLI for contrib/amcheck.

  17. Refactor and generalize the ParallelSlot machinery.

  18. Remove old-style VACUUM FULL (which was known for a little while as