6.1 & 6.2: t/29unreadable.t tests fail when run as root

[veryrusty]

It's not uncommon to have perl modules installed by root in docker images, especially for one-off, quick tasks. Doing so causes the unreadable files tests to fail in releases 6.1 and 6.2.

eg docker run --rm -ti perl:5.38 bash -c 'cpanm Module::Pluggable; cat /root/.cpanm/work/*/build.log'

and the root user can read the write-only files:

#   Failed test at t/29unreadable.t line 31.
#     Structures begin differing at:
#          $got->[0] = 'Unreadable::Foo'
#     $expected->[0] = Does not exist

#   Failed test at t/29unreadable.t line 36.
#     Structures begin differing at:
#          $got->[0] = 'Unreadable::Foo'
#     $expected->[0] = Does not exist
# Looks like you failed 2 tests of 6.
t/29unreadable.t .............

[veryrusty]

@simonwistow anything we can do to help resolve this ?
eg making a PR from @michal-josef-spacek patch from 156367

[firefart]

For cross reference https://rt.cpan.org/Public/Bug/Display.html?id=156367

[level420]

@simonwistow It would be very kind to have PR #28 merged and a new version published on cpan. Thank you in advance.

[firefart]

@simonwistow any update on this?

[maaarghk]

@simonwistow pls :')

[matthewf-ucsd]

I would also like to express my hope that this PR can be merged. I'm adding:

RUN cpanm Module::Pluggable::Object --force

... as a workaround in my Dockerfile in the meantime, but it feels dirty to force a test