[Bug 1864423] Re: Failed test 'default log is not used' with new procps 3.3.16-1

[Christian Ehrhardt ]

Replacing the perl construct
 open L, ">$default_log"; close L; # empty default log file
with the also more readable:
 truncate "$default_log", 0;
Fixes the issue in postgresql-common.

That might be a fix for this particular test, but (unfortunately) the
construct above is a common use-case in perl how did procps break that??

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Title:
  Failed test 'default log is not used' with new procps 3.3.16-1

Status in postgresql-common package in Ubuntu:
  New
Status in procps package in Ubuntu:
  New

Bug description:
  Since the new procps upload
   procps | 2:3.3.16-1ubuntu1   | focal-proposed  | source, amd64, arm64, armhf, i386, ppc64el, s390x
  the tests of postgresql-common fail.

  The issues are:
  autopkgtest [15:43:10]: test run-testsuite:  - - - - - - - - - - results - - - - - - - - - -
  run-testsuite        FAIL non-zero exit status 2
  autopkgtest [15:43:10]: test run-testsuite:  - - - - - - - - - - stderr - - - - - - - - - -
  #   Failed test 'default log is not used'
  #   at ./t/020_create_sql_remove.t line 143.
  #   Failed test 'default log is not used'
  #   at ./t/020_create_sql_remove.t line 154.
  # Looks like you failed 2 tests of 144.

  It was retried a few times by different people now and reproduced so
  we can assume it is a real issues for now.

  I was running two VMs to compare:
  $ sudo ~/work/autopkgtest/autopkgtest/runner/autopkgtest --no-built-binaries --apt-upgrade --test-name=run-testsuite --apt-pocket=proposed=src:procps --shell postgresql-common_211.dsc -- qemu --qemu-options='-cpu host' --ram-size=2048 --cpus 2 ~/work/autopkgtest-focal-amd64.img
  (and the other one without --apt-pocket=proposed=src:procps)

  The issue reproduced locally in only the one with the new procps.

  In Debian the latest similar run is
  https://ci.debian.net/data/autopkgtest/testing/amd64/p/postgresql-common/4279031/log.gz
  https://ci.debian.net/data/packages/testing/amd64/p/postgresql-common/4279031.log
  But that is pre-3.3.16 and I wasn't able to find their result with the same combination.

  Lets mark this bug update-excuse and check if we can find anything in
  these VMs.

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