Debian Bug report logs - #412927
gpm-1.19.6-19sarge binary incompatibility in wire protocol with gpm-1.20.1

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Daniël Mantione <daniel.mantione@freepascal.org>

To: submit@bugs.debian.org

Subject: gpm-1.19.6-19sarge binary incompatibility in wire protocol with gpm-1.20.1

Date: Thu, 1 Mar 2007 01:10:32 +0100 (CET)

[Message part 1 (text/plain, inline)]

Package: gpm
Version: gpm-1.19.6-19sarge

Hi,

A user reported a bug at the Free Pascal bug tracker, reporting incorrect 
mouse behaviour in the Free Pascal IDE.

This issue is tracked here:

http://www.freepascal.org/mantis/view.php?id=8416

The problem has been identified as being caused by a patch that Debian 
applies over gpm to add mouse wheel support.

The Debian gpm.h file defines the gpm_event structure like this:

                    typedef struct Gpm_Event {
                      unsigned char buttons, modifiers; /* try to be a multiple of 4 */
                      unsigned short vc;
                      short dx, dy, x, y;
                      short wdx, wdy;
                      enum Gpm_Etype type;
                      int clicks;
                      enum Gpm_Margin margin;
                    } Gpm_Event;

However, in the "official" unpatched gpm.h from gpm 1.20.1, the structure 
is like this:

                    typedef struct Gpm_Event {
                      unsigned char buttons, modifiers; /* try to be a multiple of 4 */
                      unsigned short vc;
                      short dx, dy, x, y;
                      enum Gpm_Etype type;
                      int clicks;
                      enum Gpm_Margin margin;
                      short wdx, wdy;
                    } Gpm_Event;

This causes the wire protocol used by gpm servers in Debian to be 
different from gpm servers in other distributions, therefore causing 
incorrect behaviour in applications. I see no way to distinguish a Debian 
gpm server from a normal one, so I cannot write a work-around on the 
Free Pascal side.

Regards,

Daniël Mantione

Message #10 received at 412927@bugs.debian.org (full text, mbox, reply):

From: Peter Samuelson <peter@p12n.org>

To: Daniël Mantione <daniel.mantione@freepascal.org>, 412927@bugs.debian.org

Subject: Re: Bug#412927: gpm-1.19.6-19sarge binary incompatibility in wire protocol with gpm-1.20.1

Date: Thu, 1 Mar 2007 00:31:21 -0600

[Message part 1 (text/plain, inline)]

[Daniël Mantione]
> This causes the wire protocol used by gpm servers in Debian to be
> different from gpm servers in other distributions, therefore causing
> incorrect behaviour in applications.

It is after midnight here, so I might be missing something - but when
would this protocol mismatch ever be visible?  Don't you always run
libgpm applications on the same machine as the gpm server?  If that
machine is Debian, both gpm and the libgpm used by your application
would be using the same patch.

Can you explain a scenario where binary compatibility between Debian
and non-Debian systems, for a protocol which never travels across a
network, becomes an issue?

Thanks,
Peter

[signature.asc (application/pgp-signature, inline)]

Message #15 received at 412927@bugs.debian.org (full text, mbox, reply):

From: Daniël Mantione <daniel.mantione@freepascal.org>

To: Peter Samuelson <peter@p12n.org>

Cc: 412927@bugs.debian.org

Subject: Re: Bug#412927: gpm-1.19.6-19sarge binary incompatibility in wire protocol with gpm-1.20.1

Date: Thu, 1 Mar 2007 09:17:30 +0100 (CET)

[Message part 1 (text/plain, inline)]

Op Thu, 1 Mar 2007, schreef Peter Samuelson:

> 
> [Daniël Mantione]
> > This causes the wire protocol used by gpm servers in Debian to be
> > different from gpm servers in other distributions, therefore causing
> > incorrect behaviour in applications.
> 
> It is after midnight here, so I might be missing something - but when
> would this protocol mismatch ever be visible?  Don't you always run
> libgpm applications on the same machine as the gpm server?  If that
> machine is Debian, both gpm and the libgpm used by your application
> would be using the same patch.
> 
> Can you explain a scenario where binary compatibility between Debian
> and non-Debian systems, for a protocol which never travels across a
> network, becomes an issue?

The Gpm_Event data structure is not just used in the wire protocol, but 
returned to the application. I.e. for a C application:

extern int Gpm_GetEvent(Gpm_Event *);

For a Pascal application:

function gpm_getevent(var event:Tgpm_event):longint;

This means an application compiled using one version of the Gpm_Event data 
structure will not work on a system using another version of the Gpm_Event 
data structure. This means any application compiled on a non-Debian system 
transfered to a Debian system will break.

Further, gpm.h is not really understandable for a Pascal compiler. It 
has its own gpm interface unit. Patching your gpm.h will work for 
C programs only (luckily for Debian that is a majority). That means 
compiling a Pascal program on a Debian system (Free Pascal is included in 
Debian), will cause the program to use the wrong gpm event data 
structure.

Daniël Mantione

Message #20 received at 412927@bugs.debian.org (full text, mbox, reply):

From: Daniël Mantione <daniel.mantione@freepascal.org>

To: 412927@bugs.debian.org

Subject: Reminder

Date: Mon, 23 Apr 2007 15:03:34 +0200 (CEST)

[Message part 1 (text/plain, inline)]

Hi,

I'm considering to make our gpm code support both protocols, and as 
detection is impossible, the Debian one would then get activated by 
something like "export DEBIAN_GPM_BUG_WORKAROUND=1".

However, fixing this bug will be much less work than coding such an ugly 
work around. Would it be possible to get this bug fixed within some time?

Daniël Mantione

Message #25 received at 412927@bugs.debian.org (full text, mbox, reply):

From: Daniel Serpell <daniel.serpell@aplik.cl>

To: 412927@bugs.debian.org

Subject: Fixed in version 1.20.3~pre3-1

Date: Tue, 26 Feb 2008 10:51:45 -0300

Hi!

This bug should be fixed in version 1.20.3~pre3-1, as now
the Gpm_Event structure is the "official" one.

Thanks,

   Daniel.

Message #32 received at 412927@bugs.debian.org (full text, mbox, reply):

From: Guillem Jover <guillem@debian.org>

To: control@bugs.debian.org

Cc: 412927@bugs.debian.org, 470882@bugs.debian.org, 472062@bugs.debian.org, 473496@bugs.debian.org, 474516@bugs.debian.org, 476431@bugs.debian.org, 479345@bugs.debian.org, 482138@bugs.debian.org, 483916@bugs.debian.org

Subject: setting package to gpm libgpm-dev libgpmg1-dev libgpm2, tagging 470882, tagging 476431 ...

Date: Wed, 11 Jun 2008 09:33:11 +0300

# Automatically generated email from bts, devscripts version 2.10.29
#
# gpm (1.20.4-1) UNRELEASED; urgency=low
#
#  * New upstream version. (Closes: #482138)
#    - debian/patches/001_logging.patch: Removed, merged upstream.
#    - debian/patches/006_version_000: Likewise.
#    - debian/patches/008_sun_repeat_000: Likewise.
#    - debian/patches/030_segfault: Likewise.
#    - debian/patches/001_missing_V_option.patch: Refresh.
#    - debian/patches/002_force_repeat_000: Likewise.
#    - debian/patches/005_types_000: Likewise.
#    - debian/patches/007_doc_fix_000: Likewise.
#    - debian/patches/010_ps2_rework.patch: Likewise.
#    - debian/patches/013_xterm_mouse_support_000: Likewise.
#    - debian/patches/015_libgpm_noverbose.patch: Likewise.
#    - debian/patches/030_daemon_quit: Likewise.
#    - debian/patches/040_no_OPEN_MAX.patch: Likewise.
#    - debian/patches/050_dont_link_libcurses: Likewise.
#    - debian/rules: Fix Changelog to Changes in dh_installchangelogs call.
#    - Properly cleanup on 'make clean', fixes building twice in a row.
#      (Closes: 479345)
#    - Support default gpm handlers again. (Closes: #472062)
#    - Do not log 'Connecting' and 'Request' messages on syslog.
#      (Closes: #474516)
#  * Debian broke ABI compatibility with upstream long time ago, the patch
#    got merged upstream recently but the new field was added in a different
#    place in the structure. With the new 1.20.3~pre3 release Debian had
#    to be either incompatible with previous Debian gpm versions or with
#    upstream again, but quite helpfully upstream bumped the SONAME.
#    (Closes: #412927, #470882, #473496, #476431)
#    - Add a new libgpm2 and libgpm-dev packages.
#    - Remove the libgpmg1 package.
#    - Make the libgpmg1-dev a dummy package to ease the transition.
#    - Remove old Conflicts and Replaces on libgpm1.
#    - Bump libgpm shlibs dependency to 1.20.4.
#  * Italian, thanks David Paleino.  (Closes: #483916) 

package gpm libgpm-dev libgpmg1-dev libgpm2
tags 470882 + pending
tags 476431 + pending
tags 412927 + pending
tags 483916 + pending
tags 479345 + pending
tags 482138 + pending
tags 474516 + pending
tags 472062 + pending
tags 473496 + pending

Message #53 received at 412927-close@bugs.debian.org (full text, mbox, reply):

From: Guillem Jover <guillem@debian.org>

To: 412927-close@bugs.debian.org

Subject: Bug#412927: fixed in gpm 1.20.4-1

Date: Sun, 15 Jun 2008 15:29:26 +0000

Source: gpm
Source-Version: 1.20.4-1

We believe that the bug you reported is fixed in the latest version of
gpm, which is due to be installed in the Debian FTP archive:

gpm_1.20.4-1.diff.gz
  to pool/main/g/gpm/gpm_1.20.4-1.diff.gz
gpm_1.20.4-1.dsc
  to pool/main/g/gpm/gpm_1.20.4-1.dsc
gpm_1.20.4-1_i386.deb
  to pool/main/g/gpm/gpm_1.20.4-1_i386.deb
gpm_1.20.4.orig.tar.gz
  to pool/main/g/gpm/gpm_1.20.4.orig.tar.gz
libgpm-dev_1.20.4-1_i386.deb
  to pool/main/g/gpm/libgpm-dev_1.20.4-1_i386.deb
libgpm2_1.20.4-1_i386.deb
  to pool/main/g/gpm/libgpm2_1.20.4-1_i386.deb
libgpmg1-dev_1.20.4-1_i386.deb
  to pool/main/g/gpm/libgpmg1-dev_1.20.4-1_i386.deb



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 412927@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Guillem Jover <guillem@debian.org> (supplier of updated gpm package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Wed, 11 Jun 2008 09:30:31 +0300
Source: gpm
Binary: gpm libgpm2 libgpm-dev libgpmg1-dev
Architecture: source i386
Version: 1.20.4-1
Distribution: experimental
Urgency: low
Maintainer: Debian GPM Team <pkg-gpm-devel@lists.alioth.debian.org>
Changed-By: Guillem Jover <guillem@debian.org>
Description: 
 gpm        - General Purpose Mouse interface
 libgpm-dev - General Purpose Mouse - development files
 libgpm2    - General Purpose Mouse - shared library
 libgpmg1-dev - transitional dummy package which can be safely removed
Closes: 412927 470882 472062 473496 474516 476431 479345 482138 483916
Changes: 
 gpm (1.20.4-1) experimental; urgency=low
 .
   [ Guillem Jover ]
   * New upstream version. (Closes: #482138)
     - debian/patches/001_logging.patch: Removed, merged upstream.
     - debian/patches/006_version_000: Likewise.
     - debian/patches/008_sun_repeat_000: Likewise.
     - debian/patches/030_segfault: Likewise.
     - debian/patches/001_missing_V_option.patch: Refresh.
     - debian/patches/002_force_repeat_000: Likewise.
     - debian/patches/005_types_000: Likewise.
     - debian/patches/007_doc_fix_000: Likewise.
     - debian/patches/010_ps2_rework.patch: Likewise.
     - debian/patches/013_xterm_mouse_support_000: Likewise.
     - debian/patches/015_libgpm_noverbose.patch: Likewise.
     - debian/patches/030_daemon_quit: Likewise.
     - debian/patches/040_no_OPEN_MAX.patch: Likewise.
     - debian/patches/050_dont_link_libcurses: Likewise.
     - debian/rules: Fix Changelog to Changes in dh_installchangelogs call.
     - Properly cleanup on 'make clean', fixes building twice in a row.
       (Closes: 479345)
     - Support default gpm handlers again. (Closes: #472062)
     - Do not log 'Connecting' and 'Request' messages on syslog.
       (Closes: #474516)
   * Debian broke ABI compatibility with upstream long time ago, the patch
     got merged upstream recently but the new field was added in a different
     place in the structure. With the new 1.20.3~pre3 release Debian had
     to be either incompatible with previous Debian gpm versions or with
     upstream again, but quite helpfully upstream bumped the SONAME.
     (Closes: #412927, #470882, #473496, #476431)
     - Add a new libgpm2 and libgpm-dev packages.
     - Remove the libgpmg1 package.
     - Make the libgpmg1-dev a dummy package to ease the transition.
     - Remove old Conflicts and Replaces on libgpm1.
     - Bump libgpm shlibs dependency to 1.20.4.
   * Switch to use dh_lintian instead of manually installing the overrides.
     Bump the versioned debhelper Build-Depends to 6.0.7.
   * Remove now unused gpm lintian overrides, and add one for libgpmg1-dev.
   * Fix parallel FTBFS in debian/rules by moving 'patch' dependency from
     the build to a new pre-patch target that serializes configuration.
   * Add a debian/README.source file.
   * Now using Standards-Version 3.8.0.
 .
   [ Peter Samuelson ]
   * New debconf translations:
     - Italian, thanks David Paleino.  (Closes: #483916)
Checksums-Sha1: 
 b3701fcd3afcdd19777d240e3927def0f46ac54c 1283 gpm_1.20.4-1.dsc
 5a16db5e4dc39fbf3c53a09d1460ca468ef1af44 1347133 gpm_1.20.4.orig.tar.gz
 6bf3fbeb1d991e2c2da121124a6b0c798ba72ac4 84127 gpm_1.20.4-1.diff.gz
 fa131748b283c7f6fdfc340463631215079679ac 210658 gpm_1.20.4-1_i386.deb
 375741d5bc2bb4ed4c5f7dba8ad4f6502a74b3bf 32950 libgpm2_1.20.4-1_i386.deb
 d3456adc01b326bcc7a6dba8d20655bde17aacba 35950 libgpm-dev_1.20.4-1_i386.deb
 ecc7d3b2238d8d71fc4ef7fa058e0f50bc9cfd74 22958 libgpmg1-dev_1.20.4-1_i386.deb
Checksums-Sha256: 
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 d6c87cd0f2c32e2c3435c444728f2ae60324fda60dedda783ea0f24f363e576c 1347133 gpm_1.20.4.orig.tar.gz
 94b7daa49307b12de12b87da832088735f403cfb58bef4e1f2a0be51ad8ec72c 84127 gpm_1.20.4-1.diff.gz
 3e425cacfb57b766e1c9d6b3af8f502d7e010838e65476cfd57e2a1b6daecead 210658 gpm_1.20.4-1_i386.deb
 06559ae50699ad309189aa35448c44e776f44447be24da51a01cd3b7ac54100b 32950 libgpm2_1.20.4-1_i386.deb
 976240f29a2676e4ac7dfd006673fdce4f3f67fc66ec61a859d6f9a6e59f3a58 35950 libgpm-dev_1.20.4-1_i386.deb
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Files: 
 03cc9711888d250fb3125d8c30d137f1 1283 misc optional gpm_1.20.4-1.dsc
 ac31dbe9ff294720acf4fc9328b60e22 1347133 misc optional gpm_1.20.4.orig.tar.gz
 458ff87ab66527e23df1e3a533418f03 84127 misc optional gpm_1.20.4-1.diff.gz
 e6a5fef1f85cd9782be3ec2f70097e7a 210658 misc optional gpm_1.20.4-1_i386.deb
 952a1fa0adc0cd06f8eb84911bb2fb51 32950 libs standard libgpm2_1.20.4-1_i386.deb
 da9e11223955affdd42ef159fd416801 35950 libdevel optional libgpm-dev_1.20.4-1_i386.deb
 eaf21a235f0398251f948871855ac668 22958 oldlibs extra libgpmg1-dev_1.20.4-1_i386.deb

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