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Groups > linux.debian.bugs.rc > #383583

Bug#1095202: nfs-common: file loss in upgrade due to /usr-move (DEP17 P1)

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Package: nfs-common
Version: 1:2.8.2-2~exp1
Severity: serious
Justification: file loss in upgrade scenario
Tags: patch
User: helmutg@debian.org
Usertags: dep17p1

Hi Salvatore,

thanks for raising nfs-common ahead of upload and going via
experimental. Indeed, dumat flags
/usr/lib/systemd/system/nfs-blkmap.service as a file possibly lost in an
upgrade. To experience this loss, you should install nfs-kernel-server
from bookworm and then unpack nfs-common from experimental before
upgrading nfs-kernel-server.

I am proposing a composite mitigation. Upgrading Breaks+Replaces to
Conflicts mostly prevents concurrent unpacks except in rare
circumstances. Indeed, my testing reveals that this causes apt to
upgrade nfs-kernel-server before nfs-common in one of the relevant
scenarios. Rarely, dpkg may unpack nfs-common before nfs-kernel-server
despite the declared conflict. In this situation, a protective diversion
will prevent the file loss.

I am attaching a patch and my test cases for your convenience. If you
replace the package version with the one from the archive, you should
see it fail.

Helmut

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Bug#1095202: nfs-common: file loss in upgrade due to /usr-move (DEP17 P1) Helmut Grohne <helmut@subdivi.de> - 2025-02-05 08:40 +0100
  Bug#1095202: marked as done (nfs-common: file loss in upgrade due  to /usr-move (DEP17 P1)) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-02-05 17:00 +0100

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