Bug#939904: Temporary network disruption during upgrade

[Michael Prokop]

Hi,

* Luca Boccassi [Thu Aug 18, 2022 at 03:20:22PM +0100]:
> On Thu, 2022-08-18 at 16:07 +0200, Raphaël Halimi wrote:

> > And, last but not the least, I see that /etc/resolv.conf is now part of 
> > systemd-resolved files, which means that it would be deleted when the 
> > systemd-resolved package is removed from the system. I think it would 
> > also deserve its own bug with some high priority
> 
> No, that's working as intended - you remove one resolver, you need to
> install another one that provides it.

I just tested a few things, JFYI:

* When systemd-resolved is installed and gets removed, the
  file/symlink /etc/resolv.conf gets removed as well. Is that really
  expected? (This is something e.g. the resolvconf doesn't do, you
  still end up with a /etc/resolv.conf being in-place then)

* Installation of the systemd-resolved package inside docker/podman
  fails hard for me (running on a Debian/bullseye host):

| Unpacking systemd-resolved (251.4-1) ...
| dpkg: error processing archive /var/cache/apt/archives/systemd-resolved_251.4-1_amd64.deb (--unpack):
|  unable to make backup link of './etc/resolv.conf' before installing new version: Invalid cross-device link
| Selecting previously unselected package libnss-resolve:amd64.
| Preparing to unpack .../libnss-resolve_251.4-1_amd64.deb ...
| Unpacking libnss-resolve:amd64 (251.4-1) ...
| Errors were encountered while processing:
|  /var/cache/apt/archives/systemd-resolved_251.4-1_amd64.deb
| E: Sub-process /usr/bin/dpkg returned an error code (1)

(Didn't investigate further on this yet, seems to be related to the
way dpkg handles symlinks (as set up by dh_link in the systemd
packaging) and containers with overlay doesn't like that, though
installing systemd inside docker/podman containers used to work fine
so far for me)

HTH && regards
-mika-
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