Re: maintainer scripts handling symlink to directory conversion

To: Andreas Tille <tille@debian.org>
Cc: 771753@bugs.debian.org, Debian Mentors List <debian-mentors@lists.debian.org>, "Ying-Chun Liu" <paulliu@debian.org>
Subject: Re: maintainer scripts handling symlink to directory conversion
From: Ondřej Surý <ondrej@debian.org>
Date: Fri, 12 Dec 2014 16:33:11 +0100
Message-id: <[🔎] 1418398391.2878427.202150177.20F7D098@webmail.messagingengine.com>
In-reply-to: <[🔎] 20141212152805.GD10231@an3as.eu>
References: <[🔎] 20141212105206.GD29624@an3as.eu> <[🔎] 1418389919.2833109.202092193.18010CFE@webmail.messagingengine.com> <[🔎] 20141212152805.GD10231@an3as.eu>

This will never work:

> Unpacking libavifile-0.7-bin (1:0.7.48~20090503.ds-16.2) over (1:0.7.48~20090503.ds-16.2) ...

as the old version is greater than version specified in *.maintscript.

Please re-do the test in clean (wheezy, jessie) environment

O.

On Fri, Dec 12, 2014, at 16:28, Andreas Tille wrote:
> Hi,
> 
> On Fri, Dec 12, 2014 at 02:11:59PM +0100, Ondřej Surý wrote:
> > I found two things you need to do to avoid breakages:
> > 
> > 1. Strip trailing slash for any argument (especially the first argument,
> > e.g. the path)
> > 2. Strip full path for old_path, as readlink -f is a beast in case you
> > have symlink->symlink->dir or something like that
> > 
> > E.g. do:
> > 
> > symlink_to_dir /usr/share/doc/libavifile-0.7-bin libavifile-0.7-common
> > 1:0.7.48~20090503.ds-16.1~
> > 
> > symlink_to_dir /usr/share/doc/libavifile-0.7c2 libavifile-0.7-common
> > 1:0.7.48~20090503.ds-16.1~
> > 
> > symlink_to_dir /usr/share/doc/libavifile-0.7-dev libavifile-0.7-common
> > 1:0.7.48~20090503.ds-16.1~
> > 
> > In case this doesn't help, you might need to set DPKG_DEBUG=1 before
> > running upgrade, or even mangle dpkg-maintscript-helper to have
> > #!/bin/sh -x stanza.
> 
> I tried to follow this and have removed the full path only for
> libavifile-0.7-bin to have some comparison what works and what not.
> In other words I have:
> 
> $ cat debian/*.maint*
> symlink_to_dir /usr/share/doc/libavifile-0.7-bin libavifile-0.7-common
> 1:0.7.48~20090503.ds-16.1~
> symlink_to_dir /usr/share/doc/libavifile-0.7c2
> /usr/share/doc/libavifile-0.7-common 1:0.7.48~20090503.ds-16.1~
> symlink_to_dir /usr/share/doc/libavifile-0.7-dev
> /usr/share/doc/libavifile-0.7-common 1:0.7.48~20090503.ds-16.1~
> 
> Here is what DPKG_DEBUG=1 shows on installation of libavifile-0.7-bin
> and libavifile-0.7-dev:
> 
> $ LANG= sudo DPKG_DEBUG=1 dpkg -i
> libavifile-0.7-bin_0.7.48~20090503.ds-16.2_amd64.deb 
> (Reading database ... 427590 files and directories currently installed.)
> Preparing to unpack libavifile-0.7-bin_0.7.48~20090503.ds-16.2_amd64.deb
> ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in prerm of
> libavifile-0.7-bin
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-bin
> -> libavifile-0.7-common PACKAGE=libavifile-0.7-bin:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> DEBUG: dpkg-maintscript-helper: /usr/bin/dpkg-maintscript-helper
> symlink_to_dir not required in prerm
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in preinst of
> libavifile-0.7-bin
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-bin
> -> libavifile-0.7-common PACKAGE=libavifile-0.7-bin:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> Unpacking libavifile-0.7-bin (1:0.7.48~20090503.ds-16.2) over
> (1:0.7.48~20090503.ds-16.2) ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in postrm of
> libavifile-0.7-bin
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-bin
> -> libavifile-0.7-common PACKAGE=libavifile-0.7-bin:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> Setting up libavifile-0.7-bin (1:0.7.48~20090503.ds-16.2) ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in postinst of
> libavifile-0.7-bin
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-bin
> -> libavifile-0.7-common PACKAGE=libavifile-0.7-bin:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=configure
> PARAM=1:0.7.48~20090503.ds-16.2
> Processing triggers for man-db (2.7.0.2-3) ...
> $ LANG= sudo DPKG_DEBUG=1 dpkg -i
> libavifile-0.7-dev_0.7.48~20090503.ds-16.2_amd64.deb 
> (Reading database ... 427590 files and directories currently installed.)
> Preparing to unpack libavifile-0.7-dev_0.7.48~20090503.ds-16.2_amd64.deb
> ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in prerm of
> libavifile-0.7-dev
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-dev
> -> /usr/share/doc/libavifile-0.7-common PACKAGE=libavifile-0.7-dev:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> DEBUG: dpkg-maintscript-helper: /usr/bin/dpkg-maintscript-helper
> symlink_to_dir not required in prerm
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in preinst of
> libavifile-0.7-dev
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-dev
> -> /usr/share/doc/libavifile-0.7-common PACKAGE=libavifile-0.7-dev:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> Unpacking libavifile-0.7-dev (1:0.7.48~20090503.ds-16.2) over
> (1:0.7.48~20090503.ds-16.2) ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in postrm of
> libavifile-0.7-dev
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-dev
> -> /usr/share/doc/libavifile-0.7-common PACKAGE=libavifile-0.7-dev:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=upgrade
> PARAM=1:0.7.48~20090503.ds-16.2
> Setting up libavifile-0.7-dev (1:0.7.48~20090503.ds-16.2) ...
> DEBUG: dpkg-maintscript-helper: Executing
> /usr/bin/dpkg-maintscript-helper symlink_to_dir in postinst of
> libavifile-0.7-dev
> DEBUG: dpkg-maintscript-helper: SYMLINK=/usr/share/doc/libavifile-0.7-dev
> -> /usr/share/doc/libavifile-0.7-common PACKAGE=libavifile-0.7-dev:amd64
> LASTVERSION=1:0.7.48~20090503.ds-16.1~ ACTION=configure
> PARAM=1:0.7.48~20090503.ds-16.2
> Processing triggers for man-db (2.7.0.2-3) ...
> 
> 
> The effect in both cases is the same (==none):
> 
> $ ls -l /usr/share/doc/libavifile*-bin /usr/share/doc/libavifile*-dev
> lrwxrwxrwx 1 root root 21 Feb 22  2013 /usr/share/doc/libavifile-0.7-bin
> -> libavifile-0.7-common
> lrwxrwxrwx 1 root root 21 Feb 22  2013 /usr/share/doc/libavifile-0.7-dev
> -> libavifile-0.7-common
> 
> 
> Any further hints are really welcome.
> 
> Kind regards
> 
>          Andreas.
> 
> -- 
> http://fam-tille.de


-- 
Ondřej Surý <ondrej@sury.org>
Knot DNS (https://www.knot-dns.cz/) – a high-performance DNS server

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- maintainer scripts handling symlink to directory conversion
  - From: Andreas Tille <tille@debian.org>
- Re: maintainer scripts handling symlink to directory conversion
  - From: Ondřej Surý <ondrej@debian.org>
- Re: maintainer scripts handling symlink to directory conversion
  - From: Andreas Tille <tille@debian.org>

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