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Bug#1055509: bfh-container: diversions need to be updated to deal with DEP17 P3

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  Bug#1055509: bfh-container: diversions need to be updated to deal with DEP17 P3 Helmut Grohne <helmut@subdivi.de> - 2023-11-08 20:50 +0100
    Bug#1055509: bfh-container: diversions need to be updated to deal with DEP17 P3 Helmut Grohne <helmut@subdivi.de> - 2023-12-19 15:20 +0100

#350653 — Bug#1055509: bfh-container: diversions need to be updated to deal with DEP17 P3

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On Tue, Nov 07, 2023 at 03:37:46PM +0000, Luca Boccassi wrote:
> systemd-sysv 255~rc1-3, currently in experimental, moves
> halt/poweroff/reboot/shutdown from /sbin/ to /usr/sbin/, and thus
> diversions employed by this package fall afoul of DEP17 P3. Please
> update the diversions as needed. For now, systemd-sysv has an
> unversioned conflict to avoid data losses. This will be uploaded to
> unstable this week. As soon as a fixed version of this package is
> uploaded, the conflict will be changed to versioned.

I'm proposing the attached patch to implement DEP17 mitigation M18. I
caution that the patch is untested, because piuparts failed for
unrelated reasons. open-infrastructure-compute-tools.postinst and
sudo.prerm fail inside piuparts. So consider this a starting point.

Helmut

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#353000

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On Wed, Nov 08, 2023 at 08:07:29PM +0100, Helmut Grohne wrote:
> I'm proposing the attached patch to implement DEP17 mitigation M18. I
> caution that the patch is untested, because piuparts failed for
> unrelated reasons. open-infrastructure-compute-tools.postinst and
> sudo.prerm fail inside piuparts. So consider this a starting point.

The original patch didn't work at all. molly-guard was using the same
approach and it failed on multiple accounts. After quite some back and
forth, molly-guard now has a patch that looks reasonably good and I've
ported the approach to bfh-container.

Notable:
 * Diversion targets must differ in more than aliasing.
 * Since bfh-container does not need access to the diverted files, we
   can continue to move them to a different directory.
 * To avoid the conflicts-is-not-conflicts problem, bfh-container must
   support aliased as well as canonicalized versions and not declare
   Breaks or Conflicts for diverted packages such as systemd-sysv.

Since systemd-sysv now Conflits with bfh-container testing the patch in
unstable is difficult. I've tested installing, removing and upgrading it
in bookworm though and that all works. Also the diversions look
reasonable to me.

When uploading this, please target experimental. Then we'll update
systemd-sysv to add a version to their breaks and further test the patch
before uploading to unstable.

Helmut

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