Switch compression for binary package payloads to Zstandard

[Conan-Kudo]

Since openSUSE Leap 15.2 can read and install RPMs using Zstandard compression,
we can make the switch in Factory, as Fedora has done.

Cf. https://fedoraproject.org/wiki/Changes/Switch_RPMs_to_zstd_compression

Resolves #11

[marxin]

We've got a local patch that needs to be updated:
https://build.opensuse.org/request/show/777337

[Conan-Kudo]

Please don't put it in the RPM package. The whole point of this package is to stop shipping changes as patches on RPM itself!

[marxin]

You are completely right.
What can we do @mlschroe about it?

[Conan-Kudo]

@marxin Close that SR, make a new one to remove the change we do to macrosin.diff to do xz compression and then we can merge this PR. That lets us decrease the delta on RPM and still do the transition to Zstd compression.

[marxin]

@marxin Close that SR, make a new one to remove the change we do to macrosin.diff to do xz compression and then we can merge this PR. That lets us decrease the delta on RPM and still do the transition to Zstd compression.

@mls: Are you fine with the suggested approach?

[marxin]

@mls: Are you fine with the suggested approach?

Sorry: @mlschroe

[Vogtinator]

Currently Tumbleweed supports online upgrade from Leap 15.0 and on, which this would break.

[marxin]

Note that the very same changes was accepted to Base:System/rpm:
https://build.opensuse.org/request/show/777337

@Vogtinator: If I'm correctly informed, we support update from the latest Leap (15.2) to Tumbleweed.
That's supported correctly

[Vogtinator]

openQA also tests online updates from 42.1 with success currently, those would need to be dropped.
15.1 is not EOL yet, so definitely also supported for online upgrades to TW.

@mlschroe Was zstd support backported all the way back to 15.0 or just 15.2?

[marxin]

openQA also tests online updates from 42.1 with success currently, those would need to be dropped.

Good to know. We have to inform them then.

15.1 is not EOL yet, so definitely also supported for online upgrades to TW.

Yep, but one should first update to 15.2. That was what I was told by @scarabeusiv.

@mlschroe Was zstd support backported all the way back to 15.0 or just 15.2?

Just 15.2, it's not present in 15.1.

[Vogtinator]

15.1 is not EOL yet, so definitely also supported for online upgrades to TW.

Yep, but one should first update to 15.2. That was what I was told by @scarabeusiv.

I would recommend that as well, but it's not required and not documented: https://en.opensuse.org/openSUSE:Tumbleweed_upgrade

@mlschroe Was zstd support backported all the way back to 15.0 or just 15.2?

Just 15.2, it's not present in 15.1.

Ok, so this has to wait until 15.1 is EOL at least.

[marxin]

@mlschroe May I please ping? It's a nice clean up.

[oshanz]

I'm interested of this ticket. what is the status? 15.1 is at EOL now

[marxin]

We currently use zstd in openSUSE:Tumbleweed where the suggested patch became part of https://build.opensuse.org/package/show/Base:System/rpm package.