cpanm installation problems with mixed case files

LanX has asked for the wisdom of the Perl Monks concerning the following question:

I'm having a (not very dramatic) installation problem with Emacs::PDE

The author decided to host this project, which is basically a bunch of lisp modules plus some Perl helpers on CPAN.

Now the installation fails on windows with a weird "permission denied" and no "proper Makefile.PL/Build.PL":

>cpanm Emacs::PDE
--> Working on Emacs::PDE
Fetching http://www.cpan.org/authors/id/Y/YE/YEWENBIN/Emacs-PDE-0.2.16
+.tar.gz ... OK
Could not open file 'C:\Users\ROLFLA~1\.cpanm\work\1552775378.16224\Em
+acs-PDE-0.2.16\lisp\templates\TEMPLATE.makefile.tpl': Permission deni
+ed at C:\Perl_524\site\bin/cpanm line 33.
Could not extract 'Emacs-PDE-0.2.16/lisp/templates/TEMPLATE.makefile.t
+pl' at C:\Perl_524\site\bin/cpanm line 33.
Configuring Emacs-PDE-0.2.16 ... N/A
! The distribution doesn't have a proper Makefile.PL/Build.PL See C:\U
+sers\ROLFLA~1\.cpanm\work\1552775378.16224\build.log for details.
[download]

When looking into the work directory I notice that large parts of the tar.gz wasn't unpacked.

I checked on linux-vm and all files where available there.

BUT when looking into the directory Emacs-PDE-0.2.16\lisp\templates I noticed two identical files with differing capitalization:

TEMPLATE.makefile.tpl

TEMPLATE.Makefile.tpl *

Obviously an OS problem, windows acts case insensitive while case matters on linux.

But I'm a bit stunned.

Questions:

why permission denied?
shouldn't the error message be more explicit?
if the extractions fils, why does cpanm still continue to try the installation?
is there a general policy regarding files and case in cpan-modules?
should there be one?
would it make sense if CPAN testers test for such ambiguities?

Many questions, but I don't know which is the right address to inform about this kind problems.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

*) NB: it's only a coincidence that they are called "makefile", nothing to do with the CPAN installer.

update

FWIW this bug was already reported 5 years ago: https://rt.cpan.org/Public/Bug/Display.html?id=94065

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Re: cpanm installation problems with mixed case files by syphilis (Archbishop) on Mar 17, 2019 at 01:58 UTC
why permission denied? If TEMPLATE.Makefile.tpl has already been extracted and is readonly, then an attempt to open a file named TEMPLATE.makefile.tpl for writing would create the "permission denied" error. If TEMPLATE.Makefile.tpl is not readonly, then that open command will clobber the existing content, but leave the filename as (the original) "TEMPLATE.Makefile.tpl". I haven't checked whether that behaviour is relevant to what you're seeing. Cheers, Rob	[reply]
Re: cpanm installation problems with mixed case files by Marshall (Canon) on Mar 17, 2019 at 16:05 UTC
I have no idea if this will help you or not, but the April 2018 update of Windows 10 included the ability to make directories case sensitive on a directory by directory basis. Example command: `fsutil.exe file setCaseSensitiveInfo C:\folder enable` makes "folder" case sensitive. As a caveat, I have never used this feature. An article from howtogeek is here: how-to-enable-case-sensitive-folders-on-windows-10	[reply] [d/l]
Re^2: cpanm installation problems with mixed case files by LanX (Saint) on Mar 17, 2019 at 16:20 UTC
Thanks but I already got it installed manually. :) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]