Unexpected behavior: not all modules are installed

[KES777]

I use cpm to install modules into container:

## Modules
WORKDIR ${APP_ROOT}

RUN  cpanm -n -L ./local App::cpm Carton::Snapshot  && rm -rf /root/.cpanm
COPY cpanfile ./
COPY cpanfile.snapshot ./
RUN  \
  --mount=type=cache,target=/root/.perl-cpm   \
  cpm install  -w 16  --no-test  -L ./local   \
  --show-build-log-on-failure                 \
  --snapshot ./cpanfile.snapshot              \
  --cpanfile ./cpanfile

# To generate cpanfile.snapshot
RUN  carton install

Everything goes well until one day I got error message about that module was not found.

I checked my cpanfile.snapshot and saw:

  Exception-Class-1.45
    pathname: D/DR/DROLSKY/Exception-Class-1.45.tar.gz
    provides:
      Exception::Class 1.45
      Exception::Class::Base 1.45
    requirements:

But expected:

 Exception-Class-1.45
   pathname: D/DR/DROLSKY/Exception-Class-1.45.tar.gz
   provides:
     Exception::Class 1.45
     Exception::Class::Base 1.45
   requirements:
     Carp 0
     Class::Data::Inheritable 0.02
     Devel::StackTrace 2.00
     ExtUtils::MakeMaker 0
     Scalar::Util 0
     base 0
     overload 0
     perl 5.008001
     strict 0
     warnings 0

I tried to rerun carton and cpm from inside of container:

# local/bin/carton
Installing modules using /opt/bot/cpanfile
Complete! Modules were installed into /opt/bot/local

# cpm install  -w 16  --no-test  -L ./local     --show-build-log-on-failure                   --snapshot ./cpanfile.snapshot                --cpanfile ./cpanfile
All requirements are satisfied.

cpm does not recognize requirements in some cases.

[skaji]

I'm not sure what you mean.

I checked my cpanfile.snapshot and saw:
...
But expected:

Do you mean cpanfile.snapshot should have "requirements" section?
If cpanfile.snapshot is created by carton, then is it an issue for carton?

[skaji]

If you believe cpm has a problem, then please provide a minimal example to demonstrate the problem.

[KES777]

cpanfile.txt

This is a minimal example. But when you install first time - everything is OK. Later it stops to recognize that Exception-Class has requirements.

[KES777]

Do you mean cpanfile.snapshot should have "requirements" section?

Yes, for Exception-Class-1.45 there is no requirement section.

If cpanfile.snapshot is created by carton, then is it an issue for carton?

No, either cpm or carton does not install Class::Data::Inheritable.

Carton I use for debugging purpose here: to see which dependencies were detected.