udev for /dev

udev for /dev

[Jon Smirl]

I managed to get it running on Fedora but not without a lot of trouble. 

First question, isn't there a script for rebuilding the /dev directory? I need
to rebuild mine since I stopped udev when it was pointing at /dev and it deleted
half the nodes. This is an easy accident to happen, I edited my system for the
new config and rebooted. I forgot that udev was running. It picked up /dev
instead of /udev from the newly edited config and deleted the nodes out of the
wrong directory on shutdown.

Second issue, I was forced to put a single device, /dev/console into /dev to
make this work. I discovered this because I had deleted all of the common nodes
out of /dev. Apparently it needs to be there in the transition from initrd to
the boot device. Can this be avoided? This is a real mess if you delete
/dev/console. I spent a couple of hours with my rescue disk before I figured out
what happened.

Third issue, make install does not install a decent set of default permissions.
It took me a while to figure out that X wouldn't start because it didn't have
permissions on /dev/null and /dev/random.


==Jon Smirl
jonsmirl@yahoo.com

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Re: udev for /dev

[Jon Smirl]

I'm also getting errors about fd0 and sit0 that I'll track down tomorrow.


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Re: udev for /dev

[Jon Smirl]

More missing devices, /dev/aumix, /dev/dsp. These are from the OSS compatibility
layer in ALSA.


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Re: udev for /dev

[John L Fjellstad]

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On Thu, Feb 19, 2004 at 10:20:15PM -0800, Jon Smirl wrote:
 
> First question, isn't there a script for rebuilding the /dev directory? I need
> to rebuild mine since I stopped udev when it was pointing at /dev and it deleted
> half the nodes. This is an easy accident to happen, I edited my system for the
> new config and rebooted. I forgot that udev was running. It picked up /dev
> instead of /udev from the newly edited config and deleted the nodes out of the
> wrong directory on shutdown.

I think MAKEDEV generic will recreate your /dev nodes

-- 
John L. Fjellstad
web: http://www.fjellstad.org/          Quis custodiet ipsos custodes

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Re: udev for /dev

[Frédéric L. W. Meunier]

On Fri, 20 Feb 2004, Jon Smirl wrote:

> More missing devices, /dev/aumix, /dev/dsp. These are from
> the OSS compatibility layer in ALSA.

They're here with 2.6.3.

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Re: udev for /dev

[Frédéric L. W. Meunier]

On Thu, 19 Feb 2004, Jon Smirl wrote:

> I managed to get it running on Fedora but not without a lot of trouble.
>
> First question, isn't there a script for rebuilding the /dev directory?

If it's to rebuild the static /dev that came with your
distribution, reinstall the appropriate package. Probably
dev-*.

> I need to rebuild mine since I stopped udev when it was
> pointing at /dev and it deleted half the nodes. This is an
> easy accident to happen, I edited my system for the new
> config and rebooted. I forgot that udev was running. It
> picked up /dev instead of /udev from the newly edited config
> and deleted the nodes out of the wrong directory on shutdown.

This is silly. If I understand, you had udev in /udev, edited
/etc/udev/udev.conf, pointed it to /dev, and rebooted. I did it
several times, but probably didn't notice anything because was
using devfs.

> Second issue, I was forced to put a single device,
> /dev/console into /dev to make this work. I discovered this
> because I had deleted all of the common nodes out of /dev.
> Apparently it needs to be there in the transition from initrd
> to the boot device. Can this be avoided? This is a real mess
> if you delete /dev/console. I spent a couple of hours with my
> rescue disk before I figured out what happened.

The same here. init needs it.

> Third issue, make install does not install a decent set of
> default permissions. It took me a while to figure out that X
> wouldn't start because it didn't have permissions on
> /dev/null and /dev/random.

Check the etc/udev in the sources. It has some examples.

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Re: udev for /dev

[Marco d'Itri]

On Feb 20, Jon Smirl <jonsmirl@yahoo.com> wrote:

 >More missing devices, /dev/aumix, /dev/dsp. These are from the OSS compatibility
 >layer in ALSA.

You need to configure module-init-tools to automatically load
snd_{pcm,mixer}_oss after snd_{pcm,mixer} are loaded.

-- 
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Marco | [4689 diLhsz2ewWBf2]


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Re: udev for /dev

[Jon Smirl]

--- Marco d'Itri <md@Linux.IT> wrote:
> On Feb 20, Jon Smirl <jonsmirl@yahoo.com> wrote:
> 
>  >More missing devices, /dev/aumix, /dev/dsp. These are from the OSS
> compatibility
>  >layer in ALSA.
> 
> You need to configure module-init-tools to automatically load
> snd_{pcm,mixer}_oss after snd_{pcm,mixer} are loaded.

I have these modules loaded. OSS compatibily was working before I switched to
udev for /dev. The problem is that these modules don't export their devices
under /sys so udev doesn't make device nodes for them.

I'm missing three classes of devices so far:
1) ALSA OSS compatibilty
2) floppies
3) sitX, network tunnel

The script for recreating /dev is in /dev called MAKEDEV. I couldn't find it
because udev was masking /dev.

I used the gentoo permission file. It has enough permissions in it that Fedora
will work. There probably needs to be a specific one built for Fedora.

I've also checked that you can boot with a single console device in /dev.
mknod /dev/console c 5 1


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Re: udev for /dev

[Marco d'Itri]

On Feb 20, Jon Smirl <jonsmirl@yahoo.com> wrote:

 >I have these modules loaded. OSS compatibily was working before I switched to
 >udev for /dev. The problem is that these modules don't export their devices
 >under /sys so udev doesn't make device nodes for them.
No, they do (at least on my system).

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Re: udev for /dev

[Jon Smirl]

I see the problem now, the OSS modules are not loading in the right order for
udev to work. Now I just need to figure out how to fix it.

Loading them manually works.

--- Marco d'Itri <md@Linux.IT> wrote:
> On Feb 20, Jon Smirl <jonsmirl@yahoo.com> wrote:
> 
>  >I have these modules loaded. OSS compatibily was working before I switched
> to
>  >udev for /dev. The problem is that these modules don't export their devices
>  >under /sys so udev doesn't make device nodes for them.
> No, they do (at least on my system).
> 
> -- 
> ciao, |
> Marco | [4690 trpLapDhPnVLA]
> 
> 
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==Jon Smirl
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Re: udev for /dev

[Mike Frysinger]

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On Friday 20 February 2004 11:58 am, Frédéric L. W. Meunier wrote:
> On Thu, 19 Feb 2004, Jon Smirl wrote:
> > First question, isn't there a script for rebuilding the /dev directory?
>
> If it's to rebuild the static /dev that came with your
> distribution, reinstall the appropriate package. Probably
> dev-*.

or just run `MAKEDEV generic-i386` in /dev/

> > Second issue, I was forced to put a single device,
> > /dev/console into /dev to make this work. I discovered this
> > because I had deleted all of the common nodes out of /dev.
> > Apparently it needs to be there in the transition from initrd
> > to the boot device. Can this be avoided? This is a real mess
> > if you delete /dev/console. I spent a couple of hours with my
> > rescue disk before I figured out what happened.
>
> The same here. init needs it.

no, no one *needs* it ... i think i posted an e-mail here about it before but 
it's only 'needed' if you want to see output before the *getty apps are 
started.  the kernel will open that device node before executing init so that 
init will have the proper stdout file descriptor to write to.  if you dont 
have /dev/console, the kernel prints the warning about not being able to open 
it, and then just runs init which works *fine* without the node.
-mike

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Re: udev for /dev

[Jon Smirl]

Any ideas on why alsactl is working and gnome-alsamixer isn't? I open up
gnome-alsamixer and the screen is blank. That's the way it behaves when alsa is
not loaded.

I fixed the OSS problem by modprobing in snd_mixer_oss earlier.

--- Marco d'Itri <md@Linux.IT> wrote:
> On Feb 20, Jon Smirl <jonsmirl@yahoo.com> wrote:
> 
>  >I have these modules loaded. OSS compatibily was working before I switched
> to
>  >udev for /dev. The problem is that these modules don't export their devices
>  >under /sys so udev doesn't make device nodes for them.
> No, they do (at least on my system).
> 
> -- 
> ciao, |
> Marco | [4690 trpLapDhPnVLA]
> 
> 
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Re: udev for /dev

[Jon Smirl]

--- Jon Smirl <jonsmirl@yahoo.com> wrote:
> Any ideas on why alsactl is working and gnome-alsamixer isn't? I open up
> gnome-alsamixer and the screen is blank. That's the way it behaves when alsa
> is not loaded.

This one is caused by a normal user not being able to write to
/dev/snd/controlC?
The permissions file needs to be changed to allow this on Fedora.

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Re: udev for /dev

[mjl]

this worked fine on the first attempt on sorcerer.....
this is GREAT
thanks a lot for this
JLM


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Re: udev for /dev

[Jon Smirl]

--- Mike Frysinger <vapier@gentoo.org> wrote:
> > The same here. init needs it.
> 
> no, no one *needs* it ... i think i posted an e-mail here about it before but 
> it's only 'needed' if you want to see output before the *getty apps are 
> started.  the kernel will open that device node before executing init so that 
> init will have the proper stdout file descriptor to write to.  if you dont 
> have /dev/console, the kernel prints the warning about not being able to open 
> it, and then just runs init which works *fine* without the node.
> -mike
> 
Redhat stops the boot process with an error if /dev/console can't be opened.
Only choice is to reboot the system. Maybe they adjust this in FC2 if they
integrate udev.

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Re: udev for /dev

[Greg KH]

On Wed, Feb 25, 2004 at 10:10:25PM -0800, Jon Smirl wrote:
> --- Mike Frysinger <vapier@gentoo.org> wrote:
> > > The same here. init needs it.
> > 
> > no, no one *needs* it ... i think i posted an e-mail here about it before but 
> > it's only 'needed' if you want to see output before the *getty apps are 
> > started.  the kernel will open that device node before executing init so that 
> > init will have the proper stdout file descriptor to write to.  if you dont 
> > have /dev/console, the kernel prints the warning about not being able to open 
> > it, and then just runs init which works *fine* without the node.
> > -mike
> > 
> Redhat stops the boot process with an error if /dev/console can't be opened.
> Only choice is to reboot the system. Maybe they adjust this in FC2 if they
> integrate udev.

Works for me here without that node, running rawhide (which is almost FC2).

thanks,

greg k-h


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