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<H1>[Mageia-dev] alternatives policy</H1>
<B>Anssi Hannula</B>
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TITLE="[Mageia-dev] alternatives policy">anssi at mageia.org
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<I>Wed Apr 11 03:18:42 CEST 2012</I>
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<PRE>11.04.2012 04:15, Anssi Hannula kirjoitti:
><i> 11.04.2012 03:13, Maarten Vanraes kirjoitti:
</I>>><i> Hi,
</I>>><i>
</I>>><i> from a question someone asked, i was reminded why an alternative file (
</I>>><i> /var/lib/rpm/alternative/gl_conf ) was not owned.
</I>>><i>
</I>>><i> I found out that alternative files are usually %ghost 'ed, but it seems not in
</I>>><i> this case.
</I>>><i>
</I>>><i> I looked at the alternatives policy, but it was empty as it needs yet to be
</I>>><i> written.
</I>>><i>
</I>>><i> so, is it true that alternative files should be %ghost 'ed? or not?
</I>><i>
</I>><i> /var/lib/rpm/alternatives/foo is not an "alternative file" (at least not
</I>><i> IMHO), but an internal update-alternaties db, so it is not ghosted.
</I>><i>
</I>><i> It is automatically removed by update-alternatives when it becomes empty
</I>><i> (i.e. all packages providing the alternative have been removed).
</I>><i>
</I>><i> There is one problem regarding this, though. If the files becomes
</I>><i> corrupted, the alternatives system becomes kind of stuck... IMO it
</I>><i> should zero/drop the /var/lib/rpm/alternatives/foo on error (possibly
</I>><i> with a backup). AFAICS this would mean changing the badfmt() error
</I>><i> handler in /usr/sbin/update-alternatives to remove/move the file and
</I>><i> changing the open(AF, "$admindir/$name") loop starting in line 135 to
</I>><i> handle errors gracefully...
</I>
Sorry, I changed my mind while writing the above paragraph so it got a
bit confused. I meant that in case of syntax error, a warning is printed
out (and possibly a backup of the file made) instead of aborting like
the script currently does (no zeroing/dropping the file necessary). The
old file will be overwritten later in the script when the configuration
is written back.
--
Anssi Hannula
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