Re: emulators/suse100_base on NetBSD-5/[i386|amd64] broken?

[Fredrik Pettai <pettai%nordu.net@localhost>]

On May 26, 2009, at 4:45 PM, Nicolas Joly wrote:
> On Tue, May 26, 2009 at 04:24:27PM +0200, Fredrik Pettai wrote:
> > On May 13, 2009, at 7:47 PM, Fredrik Pettai wrote:
> > > On May 1, 2009, at 11:42 AM, Thomas Klausner wrote:
> > > > On Fri, May 01, 2009 at 01:26:39AM +0200, Fredrik Pettai wrote:
> > > > > # pkg_info | grep suse
> > > > > suse_base-10.0nb5   Linux compatibility package
> > > > > suse_compat-10.0nb3 Linux compatibility package with old shared
> > > > > libraries
> > > > >
> > > > > # sysctl emul.linux.kern.osrelease
> > > > > emul.linux.kern.osrelease: 2.4.18
> >
> > I've been testing the linux emulation a bit more, and found more
> > broken things with it in NetBSD 5.0 (at least from RC4) -> NetBSD
> > 5.99.11. /emul/linux{32}/proc is mounted as describe by
> > suse100{_32}_base MESSAGE file and /emul/linux{32}/etc/mtab exists (a
> > link pointing on /emul/linux{32}/proc/mounts, which looks fine.
> >
> > One simple thing I've come across that doesn't work anymore is the /
> > emul/linux{32}/bin/df command, that fails on both i386/amd64 arch's.
>
> Indeed, the emulation prefix handling was changed prior NetBSD 5.0,
> and now symlinks cannot refer files outside the emulation root.
>
> I've forgotten about it, but the attached patch should fix it.

Yes it did, thanks.

Maybe it would be good to mentioned it in COMPAT_LINUX(8) ?

Just a suggestion below

--- /usr/src/share/man/man8/compat_linux.8.orig 2009-05-27  
01:33:30.000000000 +0200
+++ /usr/src/share/man/man8/compat_linux.8      2009-05-27  
02:09:45.000000000 +0200
@@ -568,3 +568,14 @@
 option to
 .Xr mount_nfs 8
 will also have the desired effect, but is less preferable.
+.Pp
+NetBSD/amd64 later than version 4.0.1 are known to have problems with  
the 64-bit emulation on certain CPU types, typically iNTEL CPUs. Most  
AMD CPUs seems to work well.
+.Pp
+Prior to NetBSD 5.0 the prefix handling changed, so symlinks can't  
point outside the emulation root
+.Pa /emul/linux .
+.Pa /emul/linux/etc/mtab
+in older pkgsrc packages is installed as a symlink to
+.Pa /emul/linux/proc/mounts
+which won't work. It should be symlinked as
+.Pa /proc/mounts
+instead.