[Pkg-roundcube-maintainers] Bug#478170: roundcube: files missing after install
bernat at debian.org
Sat Jul 10 16:41:38 UTC 2010
OoO Pendant le journal télévisé du dimanche 04 juillet 2010, vers 20:21,
Luca Capello <luca at pca.it> disait :
>> However, I cannot just simply drop them from the package because some
>> people installed earlier version of roundcube package and may have
>> modified /etc/default/roundcube. They should be aware that the content
>> of it has moved to /etc/default/roundcube-core and I cannot do it myself
>> because a package do not have the right to mess with files modified by
>> the user. This is why roundcube ships an empty (with comments) file.
> And this is completely wrong, you should instead move them as explained
> in the Debian wiki <http://wiki.debian.org/DpkgConffileHandling> or,
> better, through dpkg-maintscript-helper (included in dpkg >= 126.96.36.199).
I need to move a conffile from one package (roundcube) to another
(roundcube-core). It is not clear that dpkg-maintscript-helper handles
> When a package is installed for the first time dpkg will install the
> file that comes with it, unless that would mean overwriting a file
> already on the file system.
> However, note that dpkg will not replace a conffile that was removed
> by the user (or by a script). This is necessary because with some
> programs a missing file produces an effect hard or impossible to
> achieve in another way, so that a missing file needs to be kept that
> way if the user did it.
> Note that a package should not modify a dpkg-handled conffile in its
> maintainer scripts. Doing this will lead to dpkg giving the user
> confusing and possibly dangerous options for conffile update when the
> package is upgraded.
> In roundcube's postinst, you are exactly doing what you should not:
> modifing a dpkg-handled conffile, bug severity raised to normal (not
> serious because the Debian Policy extract above is a "should" and not a
> "must" nor a "required").
I don't modify a dpkg-handled conffile. I ship a new conffile whose
content should hint the user that she should move any modifications to
the new file if she has modified the previous conffile and I deleted the
old conffile if it was unmodified.
I don't use md5sum like what is done in the wiki, but I let dpkg handle
the replacement of the old conffile with a dummy conffile and prompt the
user to accept this modification if the user modified this file and
remove the file only if I find the dummy conffile intact.
This seems very similar to what is done in the wiki except that I don't
move automatically the user changes from one conffile to another.
Let me go through an example. If you have an old version of roundcube
package, you get /etc/default/roundcube. I want to move this conffile
From roundcube to roundcube-core and its name becomes
/etc/default/roundcube-core. I ship a new /etc/default/roundcube as
conffile whose content is "# Content of this file should be moved to
roundcube-core, blah, blah".
If the user did not modify the conffile, it will be replaced by the
dummy content. In postinst, I will see that the content of the conffile
is the dummy one and I will just delete the file.
If the user did modify the conffile, dpkg will ask her what to do. The
user will see the content of the new conffile (the dummy content) which
contains instructions. She can abort the installation, copy/paste the
modifications or take any appropriate actions including doing
nothing. If she does nothing, the old conffile content is not replaced
by the dummy content and the file is not erased. If she copies the
content of the old conffile to the new one and accept the changes, the
old conffile will be removed.
I would like to adopt dpkg-maintscript-helper way to do, but it seems
that this does not work when a conffile is moved from one package to
printk("Entering UltraSMPenguin Mode...\n");
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