[Bug 1895011] [NEW] virtual-packages do not pick a seeded package (ordering dependent)

[Christian Ehrhardt ]

Public bug reported:

Hi,
I've started to look into what we considered a false positive in component mismatches

o esmtp: esmtp-run
 [Reverse-Depends: logcheck (MAIN)]

The logcheck package has:
Depends: ... default-mta | mail-transport-agent ...

default-mta as well as mail-transport-agent are purely virtual

Postfix is in main and would provide both
Package: postfix
...
Provides: default-mta, mail-transport-agent


But postfix does not exist on i386.

Due to that when germinating all arches i386 will do this:
But from the log of germinate:
 26 ? Unknown dependency default-mta by logcheck
 27 * Chose esmtp-run out of mail-transport-agent to satisfy logcheck
 28 ? Unknown dependency esmtp by esmtp-run
 29 * Chose mail-transport-agent to satisfy logcheck

But while the non-existance of postfix at i386 is the reason it can't find default-mta
it is unclear why it picks esmtp-run for mail-transport-agent as there would be lsb-invalid-mta that is in main even on i386.

This can be reproduced with the simpler seeds I created:
https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/ubuntu/+ref/debug-esmtp-listing
https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+ref/debug-esmtp-listing

Those only seed logcheck and we can see the issue.

I'd have expected that ordering isn't important, but I've found that
ensuring to have lsb-invalid-mta show up before logcheck will avoid the
issue.

Not sure how to proceed (see also the IRC discussion we had today) is
this a bug that could be improved in germinate or am I looking the wrong
way with this.

** Affects: germinate (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- virtual-packages do not pick a seeded package
+ virtual-packages do not pick a seeded package (ordering dependent)

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https://bugs.launchpad.net/bugs/1895011

Title:
  virtual-packages do not pick a seeded package (ordering dependent)

Status in germinate package in Ubuntu:
  New

Bug description:
  Hi,
  I've started to look into what we considered a false positive in component mismatches

  o esmtp: esmtp-run
   [Reverse-Depends: logcheck (MAIN)]

  The logcheck package has:
  Depends: ... default-mta | mail-transport-agent ...

  default-mta as well as mail-transport-agent are purely virtual

  Postfix is in main and would provide both
  Package: postfix
  ...
  Provides: default-mta, mail-transport-agent

  
  But postfix does not exist on i386.

  Due to that when germinating all arches i386 will do this:
  But from the log of germinate:
   26 ? Unknown dependency default-mta by logcheck
   27 * Chose esmtp-run out of mail-transport-agent to satisfy logcheck
   28 ? Unknown dependency esmtp by esmtp-run
   29 * Chose mail-transport-agent to satisfy logcheck

  But while the non-existance of postfix at i386 is the reason it can't find default-mta
  it is unclear why it picks esmtp-run for mail-transport-agent as there would be lsb-invalid-mta that is in main even on i386.

  This can be reproduced with the simpler seeds I created:
  https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/ubuntu/+ref/debug-esmtp-listing
  https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+ref/debug-esmtp-listing

  Those only seed logcheck and we can see the issue.

  I'd have expected that ordering isn't important, but I've found that
  ensuring to have lsb-invalid-mta show up before logcheck will avoid
  the issue.

  Not sure how to proceed (see also the IRC discussion we had today) is
  this a bug that could be improved in germinate or am I looking the
  wrong way with this.

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