Expand DISTRO_APT_PREMIRROS syntax vs. install-only apt-sources

[Jan Kiszka <jan.kiszka@siemens.com>]

Hi all,

we have more and more scenarios where local repos are used for the build
that require credentials to access them. Those URLs should not stay on
the devices images (nor should they show up in logs).

One idea to perform the required switch / purge after completing the
installation was to use DISTRO_APT_PREMIRRORS. It would help in some
scenarios but it also lacks some features:

 - missing way to inject repo options (such as [check-valid-until=no]
   when installing from a snapshot)
 - no way to replace also the suite or components (yeah, actually a
   limitation of the involved apt mirror, but that's life)

Now I'm wondering if we should either expand DISTRO_APT_PREMIRRORS to
cover those cases as well, or invent a different self-cleaning repo
switching mechanism. I'm already seeing brute-force repo purging classes
being written, but those do not fully cut it either if you want a work
apt configuration on the device.

Thoughts?

Jan

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Siemens AG, Technology
Competence Center Embedded Linux