Scripts: Make Lua and Python optional in packaging script

[0x6178656c]

I rewrote parts of scripts/packaging/package.sh to make the Python and LUA dependencies optional.

I tried to keep things POSIX compatible.

Basics

• Short descriptions of your changes are in the release notes
  (added as entry in doc/news/_preparation_next_release.md which
  contains _(my name)_)
  Please always add something to the release notes.
• Details of what you changed are in commit messages
  (first line should have module: short statement syntax)
• References to issues, e.g. close #X, are in the commit messages.
• The buildservers are happy. If not, fix in this order:
  • add a line in doc/news/_preparation_next_release.md
  • reformat the code with scripts/dev/reformat-all
  • make all unit tests pass
  • fix all memleaks
• The PR is rebased with current master.

Checklist

• I added unit tests for my code
• I fully described what my PR does in the documentation
  (not in the PR description)
• I fixed all affected documentation (see Documentation Guidelines)
• I fixed all affected decisions (see Decision Process)
• I added code comments, logging, and assertions as appropriate (see Coding Guidelines)
• I updated all meta data (e.g. README.md of plugins and METADATA.ini)
• I mentioned every code not directly written by me in reuse syntax

Review

• Documentation is introductory, concise, good to read and describes everything what the PR does
• Examples are well chosen and understandable
• Code is conforming to our Coding Guidelines
• APIs are conforming to our Design Guidelines
• Code is consistent to our Design Decisions

Labels

• Add the "work in progress" label if you do not want the PR to be reviewed yet.
• Add the "ready to merge" label if the basics are fulfilled and no further pushes are planned by you.

[markus2330]

LGTM!

@0x6178656c How do you use the packaging script and which error occurred so that you got this idea?

@mpranj can you check if this works for the release pipeline (still builds python+lua bindings)?

[0x6178656c]

@0x6178656c How do you use the packaging script and which error occurred so that you got this idea?

To be honest, I am not entirely sure why this script is needed.

In the past I was able to package Elektra on Debian only using this script (cf. #4543). Since I wanted to package a minimal Elektra installation I did not want to have Lua or Python installed.

I think that it should be possible to configure the packaging only using CMake (and cpack). Is there a good reason for having this extra script?

[flo91]

jenkins build libelektra please