Bug#1062964: tango: NMU diff for 64-bit time_t transition

[Steve Langasek]

Source: tango
Version: 9.5.0+dfsg1-1
Severity: serious
Tags: patch pending sid trixie
Justification: library ABI skew on upgrade
User: debian-arm at lists.debian.org
Usertags: time-t

NOTICE: these changes must not be uploaded to unstable yet!

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
tango 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 tango
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/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=C, LC_CTYPE=C.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 tango-9.5.0+dfsg1/debian/changelog tango-9.5.0+dfsg1/debian/changelog
--- tango-9.5.0+dfsg1/debian/changelog	2024-01-09 12:20:11.000000000 +0000
+++ tango-9.5.0+dfsg1/debian/changelog	2024-02-04 07:36:18.000000000 +0000
@@ -1,3 +1,10 @@
+tango (9.5.0+dfsg1-1.1) experimental; urgency=medium
+
+  * Non-maintainer upload.
+  * Rename libraries for 64-bit time_t transition.
+
+ -- Steve Langasek <vorlon at debian.org>  Sun, 04 Feb 2024 07:36:18 +0000
+
 tango (9.5.0+dfsg1-1) unstable; urgency=medium
 
   * Team upload.
diff -Nru tango-9.5.0+dfsg1/debian/control tango-9.5.0+dfsg1/debian/control
--- tango-9.5.0+dfsg1/debian/control	2023-12-31 21:34:44.000000000 +0000
+++ tango-9.5.0+dfsg1/debian/control	2024-02-04 07:36:18.000000000 +0000
@@ -22,7 +22,10 @@
 Homepage: https://www.tango-controls.org
 Rules-Requires-Root: no
 
-Package: libtango95
+Package: libtango95t64
+Provides: ${t64:Provides}
+Replaces: libtango95
+Breaks: libtango95 (<< ${source:Version})
 Architecture: any
 Multi-Arch: same
 Section: libs
@@ -51,7 +54,7 @@
 Multi-Arch: same
 Section: libdevel
 Depends: libcos4-dev,
-         libtango95 (= ${binary:Version}),
+         libtango95t64 (= ${binary:Version}),
          cppzmq-dev,
          libjpeg-dev,
          ${misc:Depends}
@@ -93,7 +96,7 @@
  ESRF (www.esrf.eu), Soleil (synchrotron-soleil.fr), Alba (www.cells.es),
  and Elettra institutes (www.elettra.trieste.it).
  .
- This package contains the documentation for the libtango95 library.
+ This package contains the documentation for the libtango95t64 library.
 
 Package: libtango-tools
 Architecture: any
diff -Nru tango-9.5.0+dfsg1/debian/libtango95t64.lintian-overrides tango-9.5.0+dfsg1/debian/libtango95t64.lintian-overrides
--- tango-9.5.0+dfsg1/debian/libtango95t64.lintian-overrides	1970-01-01 00:00:00.000000000 +0000
+++ tango-9.5.0+dfsg1/debian/libtango95t64.lintian-overrides	2024-02-04 07:36:18.000000000 +0000
@@ -0,0 +1 @@
+libtango95t64: package-name-doesnt-match-sonames libtango95
diff -Nru tango-9.5.0+dfsg1/debian/rules tango-9.5.0+dfsg1/debian/rules
--- tango-9.5.0+dfsg1/debian/rules	2023-12-31 21:34:44.000000000 +0000
+++ tango-9.5.0+dfsg1/debian/rules	2024-02-04 07:36:18.000000000 +0000
@@ -61,7 +61,7 @@
 
 override_dh_install:
 	# libtango95
-	dh_install -p libtango95 usr/lib/*/libtango.so.*
+	dh_install -p libtango95t64 usr/lib/*/libtango.so.*
 
 	# libtango-dev
 	dh_install -p libtango-dev usr/include/tango/*