Hello Monks. Been a long time. Something like 10 years.

I'm working on a machine that has both Strawberry Perl and Cygwin Perl installed. In Strawberry I am using cpan (CPAN.pm) to install / update CPAN modules. That's working well.

The problem is when using cpanp (CPANPLUS) to install / update CygwinPerl. For most modules the process works correctly, but some modules cannot be installed. These are modules that are signed with PGP/GPG. I get error output like the following:

Installing CPAN (2.37)
gpg: Fatal: can't create directory '/cygdrive/c/Users/somia/AppData/Lo
+cal/.cpanp/.cpanplus/5.40.0/Installing CPAN (2.37)
gpg: Fatal: can't create directory '/cygdrive/c/Users/somia/AppData/Lo
+cal/.cpanp/.cpanplus/5.40.0/build/psZPVjvSp4/CPAN-2.37/C:/Users/somia
+/.gnupg': No such file or directory
==> BAD/TAMPERED signature detected! <==
[ERROR] Signature check failed for module 'CPAN' -- Not trusting this 
+module, aborting install

[download]

Carefully notice the path that ends in build/psZPVjvSp4/CPAN-2.37/C:/Users/somia/.gnupg. That's obviously impossible. I don't know which module is doing this but it is a bug. So is the message that a bad / tampered signature is detected; that's not what's happening. Also, note that the fact that I am using cpanp is incidental and not causal. The same results take place when I attempt to install manually.

Please also note that I realize as a long-time Cygwin user, that Cygwin setup has dozens or more packaged CPAN modules available. I just prefer using cpanp. This problem is like a piece of meat stuck in my teeth that I keep worrying at ;-)

I appreciate the attention of the monks to this.

EDIT

I've found the culprit, and it isn't Perl - just as Rob suspected. It's GPG. That's in Cygwin's /usr/bin (ikegami) and here's output from gpg --help: 

$ gpg --help
gpg (GnuPG) 2.4.5-unknown
libgcrypt 1.11.0-unknown
Copyright (C) 2024 g10 Code GmbH
License GNU GPL-3.0-or-later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: /cygdrive/c/Users/somia/C:/Users/somia/.gnupg

[download]

Color me astonished. That's something that you'd think would have shown up in Cygwin list discussions. I will take this new question over there. I will do what Danny did and configure cpanp to not check signatures. Thanks all for the interest.

Examine what is said, not who speaks.
Love the truth but pardon error.
Silence betokens consent.
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to GPG-Signed modules fail to install using cpanp under CygwinPerl by Intrepid

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