[PATCH v6] usertools: rewrite pmdinfo

[Bruce Richardson]

On Wed, Sep 28, 2022 at 08:51:39AM +0200, Robin Jarry wrote:
> Bruce Richardson, Sep 26, 2022 at 17:17:
> > > * fixed typo: /etc/ld.so.conf/*.conf -> /etc/ld.so.conf.d/*.conf
> >
> > I am a little uncertain about doing this parsing, and worried it may be a
> > bit fragile. The main file for ld.so still is ld.so.conf, which, on my
> > system anyway, does indeed just have an include for *.conf in the .d
> > directory. However, is it possible that there are systems out there that
> > still have entries in ld.so.conf and possibly elsewhere?
> >
> > I think my preference would still be to shell out to ldconfig and query its
> > database, or to shell out to ldd to get the dependencies of a .so from
> > there. I just think it may be more robust, but at the cost of running some
> > shell commands.
> >
> > However, I don't feel strongly about this, so if others prefer the
> > pure-python ld.so.conf parsing approach better, I'm ok with that.
> 
> I was also concerned with parsing ld.so.conf files. However, I did not
> find a way to get ldconfig simply to print the folders that are to be
> analyzed. This would require some regexp parsing of ldconfig output:
> 
>   ldconfig -vNX 2>/dev/null | sed -nre 's,^(/.*): \(from .*\)$,\1,p'
> 
> I don't know which way is the least hacky.
>
How about "ldconfig -p" and just using the list of libraries given to match
against those requested in the elf file, rather than worrying about
directories at all?