[Bug 1683179] Re: Variables set inside files executed with do not visible to script

[Jonathan Kamens]

Hmm. I see this in the output of perl -V:

        DEBPKG:debian/document_inc_removal - Document in perlvar that we
remove '.' from @INC by default

So I guess this is a conscious decision to remove "." from @INC in Perl
in Zesty?

Is this documented anywhere other than the perlvar man page? Like in
Zesty's release notes or something?

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Title:
  Variables set inside files executed with do not visible to script

Status in perl package in Ubuntu:
  New

Bug description:
  I just downloaded and compiled stock Perl 5.24.1 without any Ubuntu
  packages.

  Then I put this in a file called foo.pl:

  --cut
  do 'froodle.conf';
  print $froodle, "\n";
  --cut

  and this in froodle.conf:

  --cut
  $froodle = 'freedle';
  --cut

  Then I ran "perl foo.pl" with the stock Perl I had just compiled, and
  saw this:

  --cut
  $ perl foo.pl
  freedle
  $ 
  --cut

  However, when I run "perl foo.pl" with the version of Perl included in
  Zesty, I see this:

  --cut
  $ perl foo.pl

  $
  --cut

  This is a serious, significant difference in behavior between stock
  Perl and Ubuntu's Perl, and a regression from Yakkety.

  Using "do EXPR" to get variable settings from configuration files is
  even documented in the Perl documentation
  (https://perldoc.perl.org/functions/do.html). You can't just break
  this. :-/

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: perl 5.24.1-2ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity:Unity7
  Date: Sun Apr 16 16:11:29 2017
  InstallationDate: Installed on 2016-01-16 (456 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: perl
  UpgradeStatus: Upgraded to zesty on 2017-04-14 (2 days ago)

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