Support mirroring content simulating an RMT server

[srbarrios]

In order to support a tool custom made for Liberty Linux.
We need to simulate the behaviour of a RMT server into out Minima Mirror.

In theory, we are already synchronizing the same channels, but there is some missing piece to make that work.

Let's research about it.

Discussion: https://github.com/uyuni-project/sumaform/pull/1259/files#r1118824998

[Bischoff]

We don't necessarily need to simulate a RMT server. Being able to mirror it would be enough.

I suspect we will have to create a third kind of entries in minima configuration file, alongside scc: and http:

[srbarrios]

• ℹ️ We already mirror all the content as shared in the discussion, see:

http://minima-mirror-bv.mgr.prv.suse.net/repo/SUSE/Updates/ ---> SLL* folders

• It doesn't make sense to mirror content from a mirror, so it doesn't make sense a new section in our YAML file (RMT is already mirroring content, we can directly use the source origin of that content).

Example:
http://minima-mirror-bv.mgr.prv.suse.net/repo/SUSE/Updates/SLL-CB/9/x86_64/update/

• ⚠️ What we don't support is the query string the HTTP request we are currently doing it includes

This part:
?credentials=SUSE_Liberty_Linux_x86_64

🟢 : https://rmt.scc.suse.de/repo/SUSE/Updates/SLL-CB/9/x86_64/update/?credentials=SUSE_Liberty_Linux_x86_64
❓ : http://minima-mirror-bv.mgr.prv.suse.net/repo/SUSE/Updates/SLL-CB/9/x86_64/update/?credentials=SUSE_Liberty_Linux_x86_64

• 💡 My guess is that's the reason why the script was not parsing the content properly, but we need to research it: