mkosi: implement obsbinlnk

[bluca]

Allow to build mkosi images using other mkosi images (systemd-sysext)

[bluca]

@mlschroe @adrianschroeter need some help as this is not yet working, and I can't figure out what the problem is - I followed the same pattern as 50b1a58 but still I can't get an .obsbinlnk file. I also tried to implement query() but that also doesn't help.

What am I missing?

[adrianschroeter]

Can you give us a setup (either via git or somewhere in build.o.o) where we could have a look? basically a two mkosi image build setup.

[bluca]

@adrianschroeter sure, this is the base:

https://build.opensuse.org/package/show/home:bluca:mkosi/suse-image

and this is the extension that should pull the base in (BaseImage=base):

https://build.opensuse.org/package/show/home:bluca:mkosi/suse-sysext

With the patches from this PR applied, the build stays unresolvable in my local VM.

I've also pushed a patch to add queryiso() as the doc suggests, but still no luck.

Thank you!

[bluca]

@adrianschroeter did you have a chance to have a look at this?

[bluca]

@adrianschroeter @mlschroe gentle ping on this issue

[lnussel]

looks like this is almost working in pbuild. The code produces a .obsbinlnk file with content like this:

{
  arch     => "x86-64",
  hdrmd5   => "57c85225a2ed7904531814a64fe99c4a",
  lnk      => "base",
  name     => "base",
  provides => ["opensuse:tumbleweed", "base = ", "suse-image = "],
  release  => 0,
  source   => "suse-image",
  version  => undef,
}

I think the name needs to be prefixed with something like mkosi:, ie mkosi:base to indicate a namespace. Otherwise the dependency resolver cannot know that base is not a package.

[lnussel]

here it should add the prefix mkosi: I think

[bluca]

looks like this is almost working in pbuild. The code produces a .obsbinlnk file with content like this:

{
  arch     => "x86-64",
  hdrmd5   => "57c85225a2ed7904531814a64fe99c4a",
  lnk      => "base",
  name     => "base",
  provides => ["opensuse:tumbleweed", "base = ", "suse-image = "],
  release  => 0,
  source   => "suse-image",
  version  => undef,
}

I think the name needs to be prefixed with something like mkosi:, ie mkosi:base to indicate a namespace. Otherwise the dependency resolver cannot know that base is not a package.

I've added that - do you know where the side that consumes it lives, to make it parse that?

[lnussel]

Got it working with something that looks like this:

{
  arch     => "x86-64",
  hdrmd5   => "f1fa8d13dfbbc294855ee8bbf7b01261",
  lnk      => "base.raw",
  name     => "mkosi:base",
  provides => [
                "opensuse:tumbleweed",
                "mkosi:base = 0",
                "mkosi:suse-image = 0",
              ],
  release  => 0,
  source   => "suse-image",
  version  => 0,
}

Consumer would be PBuild::RepoMgr::copyimagebinaries after adding a code path for mkosi :) See pr#985
However, this is only for pbuild. Very similar code is in OBS. PBuild is a stripped down clone basically.