Re: [uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Robin Lee Powell <rlpowell@di...>]

On Mon, May 23, 2005 at 08:04:28PM +0200, Blaisorblade wrote:
> On Saturday 21 May 2005 22:07, Robin Lee Powell wrote:
> > On Fri, May 20, 2005 at 11:43:44AM -0700, Robin Lee Powell
> > wrote:
> > > I checked the archives for this, and couldn't find it, which
> > > seems odd to me, as it's happened to me every time I've
> > > managed to get a root hostfs mount working, across two
> > > versions of UML and various other things.
> > >
> > > When I get a prompt and try to log in, I get:
> > >
> > >     Unable to change tty /dev/tty1: Illegal seek
[snip]
> > Is there any way around this problem using hostfs?  Would devfs
> > help?
>
> Probably yes, or even (on 2.6) udev... 

OK, that seems to work (with some effort).

Now the problem I have is that all operations involving the passwd
file fail:

(none):/etc# pwconv
pwconv: can't lock passwd file

Any ideas on this?

-Robin

-- 
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/
Reason #237 To Learn Lojban: "Homonyms: Their Grate!"
Proud Supporter of the Singularity Institute - http://singinst.org/

[uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Robin Lee Powell <rlpowell@di...>]

I checked the archives for this, and couldn't find it, which seems
odd to me, as it's happened to me every time I've managed to get a
root hostfs mount working, across two versions of UML and various
other things.

When I get a prompt and try to log in, I get:

    Unable to change tty /dev/tty1: Illegal seek

I'm using basically the method listed in:

http://user-mode-linux.sourceforge.net/hostfs.html

Specifically, I did:

    mount /tmp/Debian-3.0r2.ext2 /tmp/chroot2 -o loop

    cp -pr /tmp/chroot2 /tmp/chroot

    find /tmp/chroot -uid 0 | xargs chown rlpowell

    linux root=/dev/root rootflags=/tmp/chroot rootfstype=hostfs con1=fd:0,fd:1 con=pts devfs=nomount

The user running the linux command is rlpowell.

Version is: User Mode Linux v2.4.26-3um

-Robin

-- 
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/
Reason #237 To Learn Lojban: "Homonyms: Their Grate!"
Proud Supporter of the Singularity Institute - http://singinst.org/

Re: [uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Robin Lee Powell <rlpowell@di...>]

On Fri, May 20, 2005 at 11:43:44AM -0700, Robin Lee Powell wrote:
> I checked the archives for this, and couldn't find it, which seems
> odd to me, as it's happened to me every time I've managed to get a
> root hostfs mount working, across two versions of UML and various
> other things.
> 
> When I get a prompt and try to log in, I get:
> 
>     Unable to change tty /dev/tty1: Illegal seek

This seems to work fine if I run UML as root.  Note that all the
dev files are owned by the user running UML.

Is there any way around this problem using hostfs?  Would devfs
help?

Thanks.

-Robin

-- 
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/
Reason #237 To Learn Lojban: "Homonyms: Their Grate!"
Proud Supporter of the Singularity Institute - http://singinst.org/

Re: [uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Blaisorblade <blaisorblade@ya...>]

On Saturday 21 May 2005 22:07, Robin Lee Powell wrote:
> On Fri, May 20, 2005 at 11:43:44AM -0700, Robin Lee Powell wrote:
> > I checked the archives for this, and couldn't find it, which seems
> > odd to me, as it's happened to me every time I've managed to get a
> > root hostfs mount working, across two versions of UML and various
> > other things.
> >
> > When I get a prompt and try to log in, I get:
> >
> >     Unable to change tty /dev/tty1: Illegal seek
>
> This seems to work fine if I run UML as root.  Note that all the
> dev files are owned by the user running UML.
Probably even if the tty is owned by the user running UML (which might become 
false over time due to PAM tricks) the requested operation is privileged on 
the host... don't know why however.
I remember that hostfs did try to open the host files for some operations... I 
fixed that at some time, but the fix surely is not on 2.4.26-3um (see my site 
for later releases).
> Is there any way around this problem using hostfs?  Would devfs
> help?
Probably yes, or even (on 2.6) udev... 
-- 
Paolo Giarrusso, aka Blaisorblade
Skype user "PaoloGiarrusso"
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade

Re: [uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Robin Lee Powell <rlpowell@di...>]

On Mon, May 23, 2005 at 08:04:28PM +0200, Blaisorblade wrote:
> On Saturday 21 May 2005 22:07, Robin Lee Powell wrote:
> > On Fri, May 20, 2005 at 11:43:44AM -0700, Robin Lee Powell
> > wrote:
> > > I checked the archives for this, and couldn't find it, which
> > > seems odd to me, as it's happened to me every time I've
> > > managed to get a root hostfs mount working, across two
> > > versions of UML and various other things.
> > >
> > > When I get a prompt and try to log in, I get:
> > >
> > >     Unable to change tty /dev/tty1: Illegal seek
[snip]
> > Is there any way around this problem using hostfs?  Would devfs
> > help?
>
> Probably yes, or even (on 2.6) udev... 

OK, that seems to work (with some effort).

Now the problem I have is that all operations involving the passwd
file fail:

(none):/etc# pwconv
pwconv: can't lock passwd file

Any ideas on this?

-Robin

-- 
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/
Reason #237 To Learn Lojban: "Homonyms: Their Grate!"
Proud Supporter of the Singularity Institute - http://singinst.org/

Re: [uml-user] Next problem: "Unable to change tty /dev/tty1: Illegal seek"

[Blaisorblade <blaisorblade@ya...>]

On Tuesday 24 May 2005 02:00, Robin Lee Powell wrote:
> On Mon, May 23, 2005 at 08:04:28PM +0200, Blaisorblade wrote:
> > On Saturday 21 May 2005 22:07, Robin Lee Powell wrote:
> > > On Fri, May 20, 2005 at 11:43:44AM -0700, Robin Lee Powell
> > >
> > > wrote:
> > > > I checked the archives for this, and couldn't find it, which
> > > > seems odd to me, as it's happened to me every time I've
> > > > managed to get a root hostfs mount working, across two
> > > > versions of UML and various other things.
> > > >
> > > > When I get a prompt and try to log in, I get:
> > > >
> > > >     Unable to change tty /dev/tty1: Illegal seek
>
> [snip]
>
> > > Is there any way around this problem using hostfs?  Would devfs
> > > help?
> >
> > Probably yes, or even (on 2.6) udev...
>
> OK, that seems to work (with some effort).
>
> Now the problem I have is that all operations involving the passwd
> file fail:
>
> (none):/etc# pwconv
> pwconv: can't lock passwd file
On my system, pwconv tries to create /etc/.pwd.lock. Try if 
"touch /etc/.pwd.lock" or "echo > /etc/.pwd.lock" succeeds, and watch 
permissions both inside and outside UML.
> Any ideas on this?
Hmm, from reading your setup, I'd suggest also changing gids...
-- 
Paolo Giarrusso, aka Blaisorblade
Skype user "PaoloGiarrusso"
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade