Re: [PATCH] modprobe.d: load from /usr/lib.

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On Tue, Jan 12, 2021 at 12:56:05PM -0800, Lucas De Marchi wrote:
> On Tue, Jan 12, 2021 at 8:06 AM Michal Suchanek <msuchanek@xxxxxxx> wrote:
> >
> > There is an ongoing effort to limit use of files outside of /usr (or
> > $prefix on general). Currently all modprobe.d paths are hardcoded to
> > outside of $prefix. Teach kmod to load modprobe.d from $prefix/lib.
> 
> /lib came from module-init-tools and we kept it for compatibility. It
> became a non-issue when distros
> decided to just merge them and do a symlink /lib -> /usr/lib following
> https://www.freedesktop.org/wiki/Software/systemd/TheCaseForTheUsrMerge/
> 
> what distros didn't do that?
> 
> I also fear the solution you want here is not so simple since now the
> configs will be added twice
> if there is the symlink.  And if we just drop /lib and start using
> /usr/lib we break compatibility.

Ins't there already a mechanism in place that loads only one file with
the same name (so that files in /etc can override files in /lib)?

Then even if the same directory is seached twice because of symlinks it
has no effect, right?

Also there is depmod.d which is documented as /lib but is actually
searched in /usr/lib.

Thanks

Michal
> 
> Lucas De Marchi
> 
> >
> > Cc: Marcus Rückert <mrueckert@xxxxxxxx>
> > Cc: Takashi Iwai <tiwai@xxxxxxxx>
> > Cc: Dominique Leuenberger <dimstar@xxxxxxxxxxxx>
> > Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx>
> > ---
> >  Makefile.am        | 1 +
> >  libkmod/libkmod.c  | 1 +
> >  man/modprobe.d.xml | 1 +
> >  3 files changed, 3 insertions(+)
> >
> > diff --git a/Makefile.am b/Makefile.am
> > index b29e943a4d29..702a665f0334 100644
> > --- a/Makefile.am
> > +++ b/Makefile.am
> > @@ -19,6 +19,7 @@ AM_CPPFLAGS = \
> >         -include $(top_builddir)/config.h \
> >         -I$(top_srcdir) \
> >         -DSYSCONFDIR=\""$(sysconfdir)"\" \
> > +       -DPREFIX=\""$(prefix)"\" \
> >         ${zlib_CFLAGS}
> >
> >  AM_CFLAGS = $(OUR_CFLAGS)
> > diff --git a/libkmod/libkmod.c b/libkmod/libkmod.c
> > index 43423d63a889..9399c6c902f8 100644
> > --- a/libkmod/libkmod.c
> > +++ b/libkmod/libkmod.c
> > @@ -65,6 +65,7 @@ static const char *default_config_paths[] = {
> >         SYSCONFDIR "/modprobe.d",
> >         "/run/modprobe.d",
> >         "/lib/modprobe.d",
> > +       PREFIX "/lib/modprobe.d",
> >         NULL
> >  };
> >
> > diff --git a/man/modprobe.d.xml b/man/modprobe.d.xml
> > index 211af8488abb..ae5a83986a52 100644
> > --- a/man/modprobe.d.xml
> > +++ b/man/modprobe.d.xml
> > @@ -40,6 +40,7 @@
> >    </refnamediv>
> >
> >    <refsynopsisdiv>
> > +    <para><filename>/usr/lib/modprobe.d/*.conf</filename></para>
> >      <para><filename>/lib/modprobe.d/*.conf</filename></para>
> >      <para><filename>/etc/modprobe.d/*.conf</filename></para>
> >      <para><filename>/run/modprobe.d/*.conf</filename></para>
> > --
> > 2.26.2
> >



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