Bug#1058937: Conflicts with libnfsidmap{2,-regex} involving aliased file locations

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.rc
Subject	Bug#1058937: Conflicts with libnfsidmap{2,-regex} involving aliased file locations
Date	2023-12-18 16:10 +0100
Message-ID	<HMnpL-erl3-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Package: libnfsidmap1
Version: 1:2.5.4-1~exp1
Severity: serious

As receently disvovered by Helmut Grohne, a conflict between binary
packages does not ensure that the files of one will be removed before
the files of the other are installed.  This can result in file loss
when the conflict involves aliased filenames rather than exactly the
same filenames.

This specific scenario exists when installing libnfsidmap1 as a
replacement for libnfsidmap{2,-regex} packages.  I was able to
reproduce it with the following sequence of commands in a minimal
bullseye amd64 chroot:

# apt -y install usrmerge
# apt -y install libnfsidmap{2,-regex}
# sed -i 's/bullseye/bookworm/' /etc/apt/sources.list
# apt update
# apt -d -y install libnfsidmap1
# (cd /var/cache/apt/archives && \
   dpkg -i libc{6,-bin}_2.36-9+deb12u3_amd64.deb \
       libsasl2-{2,modules-db}_2.1.28+dfsg-10_amd64.deb \
       libgmp10_2%3a6.2.1+dfsg1-1.1_amd64.deb \
       libgnutls30_3.7.9-2_amd64.deb libldap-2.5-0_2.5.13+dfsg-5_amd64.deb)
# dpkg -i /var/cache/apt/archives/libnfsidmap1_1%3a2.6.2-4_amd64.deb

Ben.

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Bug#1058937: Conflicts with libnfsidmap{2,-regex} involving aliased file locations Ben Hutchings <ben@decadent.org.uk> - 2023-12-18 16:10 +0100
  Bug#1058937: /usr-move: Do we support upgrades without apt? Helmut Grohne <helmut@subdivi.de> - 2023-12-21 11:10 +0100
    Bug#1058937: /usr-move: Do we support upgrades without apt? Christoph Berg <myon@debian.org> - 2023-12-21 12:00 +0100
    Bug#1058937: /usr-move: Do we support upgrades without apt? Antonio Terceiro <terceiro@debian.org> - 2023-12-21 15:30 +0100
  Bug#1058937: /usr-move: Do we support upgrades without apt? Helmut Grohne <helmut@subdivi.de> - 2023-12-22 19:00 +0100

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