Bug#1061964: g2o: NMU diff for 64-bit time_t transition

[Lukas Märdian]

Source: g2o
Version: 0~20230806-4
Severity: serious
Tags: patch pending
Justification: library ABI skew on upgrade
User: debian-arm at lists.debian.org
Usertags: time-t

Dear maintainer,

As part of the 64-bit time_t transition required to support 32-bit
architectures in 2038 and beyond
(https://wiki.debian.org/ReleaseGoals/64bit-time), we have identified
g2o as a source package shipping runtime libraries whose ABI
either is affected by the change in size of time_t, or could not be
analyzed via abi-compliance-checker (and therefore to be on the safe
side we assume is affected).

To ensure that inconsistent combinations of libraries with their
reverse-dependencies are never installed together, it is necessary to
have a library transition, which is most easily done by renaming the
runtime library package.

Since turning on 64-bit time_t is being handled centrally through a change
to the default dpkg-buildflags (https://bugs.debian.org/1037136), it is
important that libraries affected by this ABI change all be uploaded close
together in time.  Therefore I have prepared a 0-day NMU for g2o
which will initially be uploaded to experimental if possible, then to
unstable after packages have cleared binary NEW.

Please find the patch for this NMU attached.

If you have any concerns about this patch, please reach out ASAP.  Although
this package will be uploaded to experimental immediately, there will be a
period of several days before we begin uploads to unstable; so if information
becomes available that your package should not be included in the transition,
there is time for us to amend the planned uploads.



-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.5.0-14-generic (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
-------------- next part --------------
diff -Nru g2o-0~20230806/debian/changelog g2o-0~20230806/debian/changelog
--- g2o-0~20230806/debian/changelog	2023-11-02 07:00:14.000000000 +0000
+++ g2o-0~20230806/debian/changelog	2024-01-30 13:51:54.000000000 +0000
@@ -1,3 +1,10 @@
+g2o (0~20230806-4.1) experimental; urgency=medium
+
+  * Non-maintainer upload.
+  * Rename libraries for 64-bit time_t transition.
+
+ -- Lukas M?rdian <slyon at debian.org>  Tue, 30 Jan 2024 13:51:54 +0000
+
 g2o (0~20230806-4) unstable; urgency=medium
 
   * Team upload
diff -Nru g2o-0~20230806/debian/control g2o-0~20230806/debian/control
--- g2o-0~20230806/debian/control	2023-11-02 06:09:40.000000000 +0000
+++ g2o-0~20230806/debian/control	2024-01-30 13:51:54.000000000 +0000
@@ -29,7 +29,10 @@
 Vcs-Browser: https://salsa.debian.org/science-team/g2o
 Rules-Requires-Root: no
 
-Package: libg2o0
+Package: libg2o0t64
+Provides: ${t64:Provides}
+Replaces: libg2o0
+Breaks: libg2o0 (<< ${source:Version})
 Section: libs
 Architecture: any
 Multi-Arch: same
@@ -54,7 +57,7 @@
 Architecture: any
 Multi-Arch: same
 Pre-Depends: ${misc:Pre-Depends}
-Depends: ${misc:Depends}, libg2o0 (= ${binary:Version}),
+Depends: ${misc:Depends}, libg2o0t64 (= ${binary:Version}),
          libceres-dev, libeigen3-dev
 Recommends: libg2o-doc
 Description: C++ framework for optimizing graph-based nonlinear error functions
diff -Nru g2o-0~20230806/debian/libg2o0.install g2o-0~20230806/debian/libg2o0.install
--- g2o-0~20230806/debian/libg2o0.install	2023-11-02 06:09:40.000000000 +0000
+++ g2o-0~20230806/debian/libg2o0.install	1970-01-01 00:00:00.000000000 +0000
@@ -1 +0,0 @@
-/usr/lib/*/*.so.*
diff -Nru g2o-0~20230806/debian/libg2o0t64.install g2o-0~20230806/debian/libg2o0t64.install
--- g2o-0~20230806/debian/libg2o0t64.install	1970-01-01 00:00:00.000000000 +0000
+++ g2o-0~20230806/debian/libg2o0t64.install	2023-11-02 06:09:40.000000000 +0000
@@ -0,0 +1 @@
+/usr/lib/*/*.so.*
diff -Nru g2o-0~20230806/debian/libg2o0t64.lintian-overrides g2o-0~20230806/debian/libg2o0t64.lintian-overrides
--- g2o-0~20230806/debian/libg2o0t64.lintian-overrides	1970-01-01 00:00:00.000000000 +0000
+++ g2o-0~20230806/debian/libg2o0t64.lintian-overrides	2024-01-30 13:51:54.000000000 +0000
@@ -0,0 +1 @@
+libg2o0t64: package-name-doesnt-match-sonames libg2o0