Redundant binaries

[head1328]

At least perl:5.30-slim has 2 different perl binaries: /usr/bin/perl and /usr/local/bin/perl

docker run -it --rm --entrypoint=/bin/bash perl:5.30-slim

root@7f3c95a9be0d:/# ls -la /usr/bin/perl
5578215 3128 -rwxr-xr-x 2 root root 3201864 Jul 21 19:27 /usr/bin/perl

root@7f3c95a9be0d:/# ls -la $(which perl)
5582328 20 -rwxr-xr-x 2 root root 17520 Oct 13 15:12 /usr/local/bin/perl

This is quite confusing. /usr/bin/perl should be deleted or symlinked to /usr/local/bin/perl to reduce the image size as well.

[zakame]

Hi @head1328 , thanks for the report!

As you note, there is a /usr/bin/perl, that is provided by the base image that docker-perl is uses (buildpack-deps for the regular variant, debian:slim for :slim.) This is needed for things like apt to work properly, and we cannot use the /usr/local/bin/perl that we provide here for this case (as they have totally different properties, like a different @INC and even compilation options,) hence we retain /usr/bin/perl.

See also #26 and #92.

[head1328]

Ok, makes sense. Perhaps this should be mentioned in the readme?

[zakame]

Yes, I'm taking care of it in #93 (due this week.) 💪 Not only here but also in https://github.com/docker-library/docs/tree/master/perl as well.