On Thu, 2004-03-18 at 09:53, Roland McGrath wrote:
> Earlier in the day I was moved by the plight of a developer trying to
> figure out exactly how his rpm postinstall/postuninstall scripts should
> edit /etc/ld.so.conf for the directories they install libraries in.
> I think a good answer is that they shouldn't have to do that.
>
> I just implemented an `include' feature with globbing in ldconfig's
> configuration file parsing. (This will be in an unspecified future glibc
> rpm coming to you in rawhide in the fullness of time.) I propose that in
> future the canonical /etc/ld.so.conf contain just:
>
> include ld.so.conf.d/*.conf
>
> A relative file name in an include is relative to the containing file's
> directory, so that means /etc/ld.so.conf.d/*.conf will be taken together as
> the effective contents of /etc/ld.so.conf.
>
> /etc/ld.so.conf.d/foobar.conf can then be installed by the foobar package
> as a normal file, and its postinstall/postuninstall doesn't need to touch
> anything before it runs ldconfig. Note that it doesn't hurt to have the
> same directory appear multiple times (ldconfig just ignores the
> duplicates), so each package foobar installing foobar.conf containing
> (e.g.) /usr/X11R6/lib is ok. OTOH, it would also be possible to have all
> such packages install /etc/ld.so.conf.d/X11R6.conf with identical contents
> and have the rpm magic take care of it that way. Others know better than I.
I like the idea, but there are some things that I think need to be
considered when doing it:
I think we'd need to somehow be able to influence the order in which
files from /etc/ld.so.conf.d are drawn. Perhaps the files in there
should be named something like ${prio}-${name}.conf, e.g.
'50-xorg-x11.conf'. The question is what to do when the admin wants to
change the ordering -- when renaming the file, it isn't covered by
package management any longer. Perhaps encoding the ordering/priority in
the file itself might do the trick, but that opens just another can of
worms on the implementation side.
Nils
--
Nils Philippsen / Red Hat / nphilipp@xxxxxxxxxx
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." -- B. Franklin, 1759
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