No stdout when using dash

No stdout when using dash

[Andreas Thienemann]

When using the 00dash module in dracut, the emergency_shell currently has 
no stderr.

Problem is related to dash closing stderr if opening /dev/tty fails.

I just triggered an update to dash in fedora F11 and rawhide fixing this 
behaviour.
This should make the emergency shell much easier to work with.

regards,
 andreas
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Re: No stdout when using dash

[Victor Lowther]

On Sat, 2009-05-23 at 13:34 +0200, Andreas Thienemann wrote:
> When using the 00dash module in dracut, the emergency_shell currently has 
> no stderr.
> 
> Problem is related to dash closing stderr if opening /dev/tty fails.
> 
> I just triggered an update to dash in fedora F11 and rawhide fixing this 
> behaviour.
> This should make the emergency shell much easier to work with.

Can you also post the fix upstream?  That way those of us who are not
developing on Fedora can also benefit. :)

> regards,
>  andreas
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Victor Lowther
RHCE# 805008539634727
LPIC-2# LPI000140019

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Re: No stdout when using dash

[Andreas Thienemann]

On Sat, 23 May 2009, Victor Lowther wrote:

> > I just triggered an update to dash in fedora F11 and rawhide fixing this 
> > behaviour.
> > This should make the emergency shell much easier to work with.
> Can you also post the fix upstream?  That way those of us who are not
> developing on Fedora can also benefit. :)

No need. The patch has been pulled from upstream git.There just hasn't 
been a new upstream release:

commit fcc4134a7b76d82d39dea635c41ec593a41d6d19
Author: Herbert Xu <herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
Date:   Sun Feb 22 19:29:48 2009 +0800


regards,
 andreas
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Re: No stdout when using dash

[Victor Lowther]

On May 23, 2009, at 7:51 AM, Andreas Thienemann <andreas-XTk7JcP0uDNeoWH0uzbU5w@public.gmane.org>  
wrote:

> On Sat, 23 May 2009, Victor Lowther wrote:
>
>>> I just triggered an update to dash in fedora F11 and rawhide  
>>> fixing this
>>> behaviour.
>>> This should make the emergency shell much easier to work with.
>> Can you also post the fix upstream?  That way those of us who are not
>> developing on Fedora can also benefit. :)
>
> No need. The patch has been pulled from upstream git.There just hasn't
> been a new upstream release:

Cool, just wanted to be sure.

>
> commit fcc4134a7b76d82d39dea635c41ec593a41d6d19
> Author: Herbert Xu <herbert-lOAM2aK0SrRLBo1qDEOMRrpzq4S04n8Q@public.gmane.org>
> Date:   Sun Feb 22 19:29:48 2009 +0800
>
>
> regards,
> andreas
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Re: No stdout when using dash

[Victor Lowther]

On Sat, 2009-05-23 at 13:34 +0200, Andreas Thienemann wrote:
> When using the 00dash module in dracut, the emergency_shell currently has 
> no stderr.
> 
> Problem is related to dash closing stderr if opening /dev/tty fails.
> 
> I just triggered an update to dash in fedora F11 and rawhide fixing this 
> behaviour.
> This should make the emergency shell much easier to work with.

In the meantime, though...

diff --git a/modules.d/99base/init b/modules.d/99base/init
index ac6a2d8..fbebff1 100755
--- a/modules.d/99base/init
+++ b/modules.d/99base/init
@@ -35,6 +35,7 @@ NEWROOT="/sysroot"
 
 trap "emergency_shell" 0
 
+# we need /dev/null really early
 mknod /dev/null c 1 3
 
 # mount some important things
@@ -42,15 +43,17 @@ mount -t proc /proc /proc >/dev/null 2>&1
 mount -t sysfs /sys /sys >/dev/null 2>&1
 mount -t tmpfs -omode=0755 udev /dev >/dev/null 2>&1
 
-read CMDLINE </proc/cmdline;
-getarg ramfsdebug && set -x
 # Make some basic devices first, let udev handle the rest
 mknod /dev/null c 1 3
 mknod /dev/ptmx c 5 2
 mknod /dev/console c 5 1
+mknod /dev/tty c 5 0
 mkdir /dev/pts
 mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts >/dev/null 2>&1
 
+read CMDLINE </proc/cmdline;
+getarg ramfsdebug && set -x
+
 # pre-udev scripts run before udev starts, and are run only once.
 getarg 'break=pre-udev' && emergency_shell
 source_all pre-udev


> regards,
>  andreas
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LPIC-2# LPI000140019

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Re: No stdout when using dash

[Andreas Thienemann]

On Sat, 23 May 2009, Victor Lowther wrote:

> In the meantime, though...

That patch is unneeded for the current functionality.
/dev/tty cannot be opened, even though you're creating it.

strace gives:
open("/dev/tty", O_RDWR) = -1 ENXIO (No such device or address)

Thus reshuffling the set -x call later doesn't do any good.

Furthermore: tty is not needed for basic shell functionality at all.

regards,
 andreas
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Re: No stdout when using dash

[Kay Sievers]

On Sat, May 23, 2009 at 14:48, Victor Lowther <victor.lowther-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> +getarg ramfsdebug && set -x

Btw, "ramfs" is a well known kernel filesystem type, I don't think we
should use that name here.

The kernel parameter which binary to start in initramfs is "rdinit",
unlike "init" which is the binary to start in the real rootfs. Maybe
we just keep the rd-prefix for such variables?

Thanks,
Kay
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Re: No stdout when using dash

[Victor Lowther]

On May 23, 2009, at 8:26 AM, Kay Sievers <kay.sievers-tD+1rO4QERM@public.gmane.org> wrote:

> On Sat, May 23, 2009 at 14:48, Victor Lowther <victor.lowther-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
> > wrote:
>
>> +getarg ramfsdebug && set -x
>
> Btw, "ramfs" is a well known kernel filesystem type, I don't think we
> should use that name here.
>
> The kernel parameter which binary to start in initramfs is "rdinit",
> unlike "init" which is the binary to start in the real rootfs. Maybe
> we just keep the rd-prefix for such variables?

Sounds reasonable.

>
> Thanks,
> Kay
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[PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

dash gets upset when it cannot open /dev/tty, and we lose stderr. Even
if we make /dev/tty once we're in the initramfs, it will still be too
late for the inital dash shell running the init script. So, make a small
set of nodes in the dracut script while building the directory structure
of the initramfs.

This allowed the error from the duplicate mknod /dev/null in the
initramfs to surface, so consider it tested. :)
---
On Sat, 2009-05-23 at 13:34 +0200, Andreas Thienemann wrote:
> When using the 00dash module in dracut, the emergency_shell currently has 
> no stderr.
> 
> Problem is related to dash closing stderr if opening /dev/tty fails.

Here's an alternate fix that works with today's dash in F10.
Dave

diff --git a/dracut b/dracut
index 942c420..02e9137 100755
--- a/dracut
+++ b/dracut
@@ -116,6 +116,12 @@ for d in bin sbin usr/bin usr/sbin usr/lib etc proc sys sysroot dev/pts var/run;
     mkdir -p "$initdir/$d"; 
 done
 
+# Make some basic devices in the initramfs, udev will handle the rest.
+mknod "$initdir/dev/null" c 1 3
+mknod "$initdir/dev/tty" c 5 0
+mknod "$initdir/dev/console" c 5 1
+mknod "$initdir/dev/ptmx" c 5 2
+
 # check all our modules to see if they should be sourced
 check_modules
   
@@ -153,4 +159,4 @@ unset item
 
 [[ "$beverbose" = "yes" ]] && ls -lh "$outfile"
 
-exit 0
\ No newline at end of file
+exit 0
diff --git a/modules.d/99base/init b/modules.d/99base/init
index 5ee897e..9a72b30 100755
--- a/modules.d/99base/init
+++ b/modules.d/99base/init
@@ -28,19 +28,12 @@ trap "emergency_shell" 0
 
 . /lib/dracut-lib
 
-mknod /dev/null c 1 3
-
 # mount some important things
 mount -t proc /proc /proc >/dev/null 2>&1
 mount -t sysfs /sys /sys >/dev/null 2>&1
 mount -t tmpfs -omode=0755 udev /dev >/dev/null 2>&1
 
 getarg rdinitdebug && set -x
-# Make some basic devices first, let udev handle the rest
-mknod /dev/null c 1 3
-mknod /dev/ptmx c 5 2
-mknod /dev/console c 5 1
-mkdir /dev/pts
 mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts >/dev/null 2>&1
 
 # pre-udev scripts run before udev starts, and are run only once.




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Re: [PATCH] dracut: make initial devices outside of initramfs

[Jeremy Katz]

On Monday, May 25 2009, David Dillow said:
> dash gets upset when it cannot open /dev/tty, and we lose stderr. Even
> if we make /dev/tty once we're in the initramfs, it will still be too
> late for the inital dash shell running the init script. So, make a small
> set of nodes in the dracut script while building the directory structure
> of the initramfs.

Creating the nodes in the dracut script means that you can't create the
initramfs as non-root, though.  :(

Jeremy
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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Mon, 2009-05-25 at 22:44 -0400, Jeremy Katz wrote:
> On Monday, May 25 2009, David Dillow said:
> > dash gets upset when it cannot open /dev/tty, and we lose stderr. Even
> > if we make /dev/tty once we're in the initramfs, it will still be too
> > late for the inital dash shell running the init script. So, make a small
> > set of nodes in the dracut script while building the directory structure
> > of the initramfs.
> 
> Creating the nodes in the dracut script means that you can't create the
> initramfs as non-root, though.  :(

Bummer, that. And while it makes the initial dash able to give us
stderr, it doesn't fix the emergency shell. Of course, I noticed this
after hitting send... so bad patch all around. :(

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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Mon, 2009-05-25 at 22:58 -0400, David Dillow wrote:
> On Mon, 2009-05-25 at 22:44 -0400, Jeremy Katz wrote:
> > On Monday, May 25 2009, David Dillow said:
> > > dash gets upset when it cannot open /dev/tty, and we lose stderr. Even
> > > if we make /dev/tty once we're in the initramfs, it will still be too
> > > late for the inital dash shell running the init script. So, make a small
> > > set of nodes in the dracut script while building the directory structure
> > > of the initramfs.
> > 
> > Creating the nodes in the dracut script means that you can't create the
> > initramfs as non-root, though.  :(
> 
> Bummer, that. And while it makes the initial dash able to give us
> stderr, it doesn't fix the emergency shell. Of course, I noticed this
> after hitting send... so bad patch all around. :(

I'm a dope, initial dash has always had stderr.

This ugliness points /dev/tty at the actual device of /dev/console while
running the emergency shell, then puts it back when done so if we do
manage to mount things, /dev will have the right devices when
switch_root moves it.

I'm not sure if its worth it, but at least I have a prompt and stderr in
the emergency shell now, even after udev runs.

diff --git a/modules.d/99base/init b/modules.d/99base/init
index 5ee897e..4e2d73f 100755
--- a/modules.d/99base/init
+++ b/modules.d/99base/init
@@ -11,7 +11,13 @@ emergency_shell()
     echo ; echo
     echo "Bug in initramfs /init detected. Dropping to a shell. Good luck!"
     echo
+    # Point /dev/tty at the device for /dev/console as we don't have a
+    # controlling shell here and dash won't give us stderr or a prompt
+    # w/o a working /dev/tty
+    rm -f /dev/tty; mknod /dev/tty c 5 1
     sh -i
+    # Point it back to the real device
+    rm -f /dev/tty; mknod /dev/tty c 5 0
 }
 
 source_all() {


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Re: [PATCH] dracut: make initial devices outside of initramfs

[Andreas Thienemann]

On Mon, 25 May 2009, David Dillow wrote:

> Bummer, that. And while it makes the initial dash able to give us
> stderr, it doesn't fix the emergency shell. Of course, I noticed this
> after hitting send... so bad patch all around. :(

I think the patch is unnecessary in any case.

Dash loosing stderr when /dev/tty is unavailable is a dash bug. It's been 
fixed in upstream git and the patch has been applied to rawhide and F11.

I think the problem should be considered fixed and we won't have to
introduce workarounds like pre-creating device nodes.

regards,
 andreas
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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Tue, 2009-05-26 at 16:36 +0200, Andreas Thienemann wrote:
> On Mon, 25 May 2009, David Dillow wrote:
> 
> > Bummer, that. And while it makes the initial dash able to give us
> > stderr, it doesn't fix the emergency shell. Of course, I noticed this
> > after hitting send... so bad patch all around. :(
> 
> I think the patch is unnecessary in any case.
> 
> Dash loosing stderr when /dev/tty is unavailable is a dash bug. It's been 
> fixed in upstream git and the patch has been applied to rawhide and F11.
> 
> I think the problem should be considered fixed and we won't have to
> introduce workarounds like pre-creating device nodes.

Some of us want to use dracut on F10, or better yet CentOS 5.3. And we
test on released distros, not an unreleased one (albeit coming very
soon).

Does my later patch, that just makes /dev/tty point to /dev/console for
the emergency shell seem unobtrusive enough to take upstream?

If I need to carry this locally, I don't mind, but I figure others could
use the fix when working on the initramfs.
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Re: [PATCH] dracut: make initial devices outside of initramfs

[Harald Hoyer]

On 05/26/2009 04:59 PM, David Dillow wrote:
> On Tue, 2009-05-26 at 16:36 +0200, Andreas Thienemann wrote:
>> On Mon, 25 May 2009, David Dillow wrote:
>>
>>> Bummer, that. And while it makes the initial dash able to give us
>>> stderr, it doesn't fix the emergency shell. Of course, I noticed this
>>> after hitting send... so bad patch all around. :(
>> I think the patch is unnecessary in any case.
>>
>> Dash loosing stderr when /dev/tty is unavailable is a dash bug. It's been
>> fixed in upstream git and the patch has been applied to rawhide and F11.
>>
>> I think the problem should be considered fixed and we won't have to
>> introduce workarounds like pre-creating device nodes.
>
> Some of us want to use dracut on F10, or better yet CentOS 5.3. And we
> test on released distros, not an unreleased one (albeit coming very
> soon).
>
> Does my later patch, that just makes /dev/tty point to /dev/console for
> the emergency shell seem unobtrusive enough to take upstream?
>
> If I need to carry this locally, I don't mind, but I figure others could
> use the fix when working on the initramfs.
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just omit the dash module for debugging purposes :)

dracut --omit dash

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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Tue, 2009-05-26 at 18:15 +0200, Harald Hoyer wrote:
> On 05/26/2009 04:59 PM, David Dillow wrote:
> > If I need to carry this locally, I don't mind, but I figure others could
> > use the fix when working on the initramfs.
>
> just omit the dash module for debugging purposes :)
> 
> dracut --omit dash

Yeah, but I want to be a good citizen and make sure my scripts work with
dash, which often requires debugging. :)

If you guys don't want to put in fixes for this, I'm fine with carrying
it locally. I can understand not wanting to work around every broken
utility out there, but at some point it may make sense to list the
distro's we're going to explicitly support, and then we may want to have
workarounds available for the tools provided.
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Re: [PATCH] dracut: make initial devices outside of initramfs

[Andreas Thienemann]

On Tue, 26 May 2009, David Dillow wrote:

> Some of us want to use dracut on F10, or better yet CentOS 5.3. And we
> test on released distros, not an unreleased one (albeit coming very
> soon).

I can push an upgrade for F10. But Centos? I'm not sure they  even have 
dash.


> Does my later patch, that just makes /dev/tty point to /dev/console for
> the emergency shell seem unobtrusive enough to take upstream?

Personally, I don't like it. It's a workaround for one single shell, which 
has this bug already fixed in it's code repo.

I think we shouldn't start putting workarounds into dracut yet. We'll have 
to do that early enough already, no need to be premature. :D
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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Tue, 2009-05-26 at 18:20 +0200, Andreas Thienemann wrote:
> On Tue, 26 May 2009, David Dillow wrote:
> 
> > Some of us want to use dracut on F10, or better yet CentOS 5.3. And we
> > test on released distros, not an unreleased one (albeit coming very
> > soon).
> 
> I can push an upgrade for F10. But Centos? I'm not sure they  even have 
> dash.

They do.

> > Does my later patch, that just makes /dev/tty point to /dev/console for
> > the emergency shell seem unobtrusive enough to take upstream?
> 
> Personally, I don't like it. It's a workaround for one single shell, which 
> has this bug already fixed in it's code repo.
> 
> I think we shouldn't start putting workarounds into dracut yet. We'll have 
> to do that early enough already, no need to be premature. :D

Ok, I'm fine with carrying this locally until F10 gets fixed. I agree
with not wanting to have to accumulate workarounds until we start
listing supported distros.
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Re: [PATCH] dracut: make initial devices outside of initramfs

[Andreas Thienemann]

On Tue, 26 May 2009, David Dillow wrote:

> > I can push an upgrade for F10. But Centos? I'm not sure they  even have 
> > dash.
> They do.

Not in main AFAICS and EPEL doesn't have it either. So no way of me fixing 
the issue there. 

But F10 just got an updated dash built.

 
> Ok, I'm fine with carrying this locally until F10 gets fixed. I agree
> with not wanting to have to accumulate workarounds until we start
> listing supported distros.

Right, which could be an interesting excercise in itself... :/

regards,
 andreas
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Re: [PATCH] dracut: make initial devices outside of initramfs

[David Dillow]

On Tue, 2009-05-26 at 15:55 -0400, David Dillow wrote:
> On Tue, 2009-05-26 at 18:20 +0200, Andreas Thienemann wrote:
> > On Tue, 26 May 2009, David Dillow wrote:
> > 
> > > Some of us want to use dracut on F10, or better yet CentOS 5.3. And we
> > > test on released distros, not an unreleased one (albeit coming very
> > > soon).
> > 
> > I can push an upgrade for F10. But Centos? I'm not sure they  even have 
> > dash.
> 
> They do.

Bah! I cannot read -- I saw dasher instead of dash, so they do not
include it.
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Re: [PATCH] dracut: make initial devices outside of initramfs

[Warren Togami]

On 05/26/2009 04:39 PM, David Dillow wrote:
> Bah! I cannot read -- I saw dasher instead of dash, so they do not
> include it.

Anybody can join EPEL as a packager to add and maintain packages in the 
EPEL collection.

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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Re: [PATCH] dracut: make initial devices outside of initramfs

[Warren Togami]

On 05/25/2009 10:44 PM, Jeremy Katz wrote:
> On Monday, May 25 2009, David Dillow said:
>> dash gets upset when it cannot open /dev/tty, and we lose stderr. Even
>> if we make /dev/tty once we're in the initramfs, it will still be too
>> late for the inital dash shell running the init script. So, make a small
>> set of nodes in the dracut script while building the directory structure
>> of the initramfs.
>
> Creating the nodes in the dracut script means that you can't create the
> initramfs as non-root, though.  :(
>

Unless we write a separate program that outputs cpio files.  Perhaps not 
worth the effort?  How important is it to make initrd from non-root?

Warren Togami
wtogami-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
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