Support external dependencies

[svartkanin]

This should enable support for external dependencies, fix https://github.com/archlinux/archinstall/issues/1447

Since the project is using flit as a install/build/publish utility, we should no longer need the legacy setup.{py,cfg} files since everything is managed in the pyproject.toml.

Now, flit has some downsides unfortunately, like it can't install "only" dependencies from a pyproject.toml file and it also doesn't allow to specify a target installation directory. Since https://wiki.archlinux.org/title/Python_package_guidelines#Installation_methods mentions that installation has to be done into a temporary directory flit can't achieve this and therefore can't be used in the PKGBUILD file. Looking at other projects, a fair amount of them are using pip to install both, the dependencies and the package, into the temporary directory, so I borrowed the approach from those

I'm not an expert in the PKGBUILD space so @Torxed please advise if this is a bad idea :)

[Torxed]

Interesting, I'll have a gander at this :) Would this solve https://github.com/pypa/flit/issues/509? :)

[svartkanin]

@Torxed I haven't tried that actually, I'll test that tomorrow

[svartkanin]

I do remember though that in the reworked profile PR https://github.com/archlinux/archinstall/pull/1434, I had removed the links since they caused some issues in various IDEs and I wasn't sure about the usage of them. Are those symlinks necessary to keep around and if so is there another use case except having them in the root for more visibility?

[svartkanin]

@Torxed I run it on my local this is the resulting structure

$ ls pkg/archinstall/usr/lib/python3.10/site-packages/archinstall/
drwxr-xr-x  3 dan dan 4.0K Sep 22 11:37 examples
-rw-r--r--  1 dan dan  12K Sep 22 11:37 __init__.py
drwxr-xr-x 10 dan dan 4.0K Sep 22 11:37 lib
drwxr-xr-x 16 dan dan 4.0K Sep 22 11:37 locales
-rw-r--r--  1 dan dan  481 Sep 22 11:37 __main__.py
drwxr-xr-x  4 dan dan 4.0K Sep 22 11:37 profiles
drwxr-xr-x  2 dan dan 4.0K Sep 22 11:37 __pycache__

when running master with

python setup.py install

it results in

$ ls /usr/lib/python3.10/site-packages/archinstall-2.5.1rc1-py3.10.egg/archinstall/
drwxr-xr-x  3 root root 4.0K Sep 22 11:47 examples
-rw-r--r--  1 root root  13K Sep 22 11:47 __init__.py
drwxr-xr-x 10 root root 4.0K Sep 22 11:47 lib
drwxr-xr-x 20 root root 4.0K Sep 22 11:47 locales
-rw-r--r--  1 root root  481 Sep 22 11:47 __main__.py
drwxr-xr-x  4 root root 4.0K Sep 22 11:47 profiles
drwxr-xr-x  2 root root 4.0K Sep 22 11:47 __pycache__

which seems to be the same

[svartkanin]

I'll take this as a reference https://github.com/archlinux/archinstall/issues/1477#issuecomment-1265519354 :)

Anything I can help here with further? If we're certain that we're moving forward with external dependencies I'd be keen on starting implementation with pyparted meanwhile:)

[Torxed]

Let me check some things first, especially around packaging :)

[svartkanin]

This work has all been merged with another PR so I'll close this PR