Debian bug report logs - #1496
dpkg returns to dselect on SIGSTOP

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From chiark.chu.cam.ac.uk!ian Sat Oct 28 19:36:07 1995
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Date: Sun, 29 Oct 95 02:35 GMT
From: Ian Jackson <ian@chiark.chu.cam.ac.uk>
To: debian-bugs@pixar.com
Subject: Re: Bug#1496: dpkg returns to dselect on SIGSTOP 
In-Reply-To: <23276931@toto.iv>

Some time ago I asked:
> Ian M.: please arrange for the environment variable "DPKG_NO_TSTP" to
> be set to some non-empty value (like "yes") when dselect is invoked in
> this way.  This will cause dpkg to invoke "$SHELL -i" instead (or "sh
> -i" if SHELL isn't set).
> 
> This feature will be in 0.93.79.
> 
> Of course, any conffiles prompts at this stage reflect bugs in the
> base disks.

I'm going to reassign this bug to the base package.  Bruce: if this
feature is now used (and if there are no conffiles prompts), could you
close it ?

Thanks,
Ian.

Message received at debian-bugs:

From cus.cam.ac.uk!iwj10 Thu Sep 28 19:03:41 1995
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Date: Fri, 29 Sep 95 02:59 BST
From: Ian Jackson <iwj10@cus.cam.ac.uk>
To: debian-bugs@pixar.com
Subject: Re: Bug#1496: dpkg returns to dselect on SIGSTOP 

Ian Murdock writes ("Bug#1496: dpkg returns to dselect on SIGSTOP"):
>    Date: Thu, 28 Sep 95 20:28 BST
>    From: Ian Jackson <iwj10@cus.cam.ac.uk>
> 
>    > I was using dselect for the first time (for real), and it is very,
>    > very nice.  However, while it was upgrading my bash.deb, it stopped to
>    > query about the confile '/etc/profile'.  Fair enough, it was
>    > different.  I chose the 'Z' (?) option to suspend and investigate for
>    > myself.  dpkg was then stopped, but instead of starting a shell, it
>    > returned to the dselect menu, after which I couldn't do anything, as
>    > dpkg was locked.
> 
>    I had a bug report like this before.  Can you reproduce it ?  If you
>    have two .deb files which have different versions of a conffile in it
>    you can keep getting dpkg to prompt by editing the conffile once and
>    then never answering `y' as you install them alternately.
> 
> Were you doing this in the dselect automatically started after
> installing the base system?  In this case, dselect is started from a
> shell script (namely, /root/.bash_profile).  Could this be the
> problem?

Aaah, the light dawns.  Ooops.

Ian M.: please arrange for the environment variable "DPKG_NO_TSTP" to
be set to some non-empty value (like "yes") when dselect is invoked in
this way.  This will cause dpkg to invoke "$SHELL -i" instead (or "sh
-i" if SHELL isn't set).

This feature will be in 0.93.79.

Of course, any conffiles prompts at this stage reflect bugs in the
base disks.

Ian.

Message received at debian-bugs:

From pixar.com!bruce Thu Sep 28 16:27:11 1995
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To: Ian Murdock <imurdock@debian.org>, debian-bugs@Pixar.com
Cc: bruce@Pixar.com, iwj10@cus.cam.ac.uk
Subject: Re: Bug#1496: dpkg returns to dselect on SIGSTOP 
In-Reply-To: Your message of "Thu, 28 Sep 1995 17:23:00 PST."
             <m0syRMo-000014C@imagine.imaginit.com> 
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Date: Thu, 28 Sep 1995 16:26:03 -0700
From: Bruce Perens <bruce@Pixar.com>


imurdock@debian.org said:
> Were you doing this in the dselect automatically started after 
> installing the base system?  In this case, dselect is started from a 
> shell script (namely, /root/.bash_profile).  Could this be the 
> problem? 

Does dpkg attempt to suspend itself rather than fork off a shell? That would
certainly break in this case. Probably we need a flag to dpkg/dselect to
change this behavior.

	Bruce

--
-- Attention Radio Amateurs: For information on "Linux for Hams",
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From debian.org!imurdock Thu Sep 28 15:19:27 1995
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Date: Thu, 28 Sep 95 17:23 EST
From: Ian Murdock <imurdock@debian.org>
To: debian-bugs@pixar.com
In-Reply-To: <m0syOdJ-0002ZJZ@chiark.al.cl.cam.ac.uk> (message from Ian
	Jackson on Thu, 28 Sep 95 20:28 BST)
Subject: Re: Bug#1496: dpkg returns to dselect on SIGSTOP

   Date: Thu, 28 Sep 95 20:28 BST
   From: Ian Jackson <iwj10@cus.cam.ac.uk>

   > I was using dselect for the first time (for real), and it is very,
   > very nice.  However, while it was upgrading my bash.deb, it stopped to
   > query about the confile '/etc/profile'.  Fair enough, it was
   > different.  I chose the 'Z' (?) option to suspend and investigate for
   > myself.  dpkg was then stopped, but instead of starting a shell, it
   > returned to the dselect menu, after which I couldn't do anything, as
   > dpkg was locked.

   I had a bug report like this before.  Can you reproduce it ?  If you
   have two .deb files which have different versions of a conffile in it
   you can keep getting dpkg to prompt by editing the conffile once and
   then never answering `y' as you install them alternately.

Were you doing this in the dselect automatically started after
installing the base system?  In this case, dselect is started from a
shell script (namely, /root/.bash_profile).  Could this be the
problem?

Message received at debian-bugs:

From cus.cam.ac.uk!iwj10 Thu Sep 28 12:44:51 1995
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Date: Thu, 28 Sep 95 20:28 BST
From: Ian Jackson <iwj10@cus.cam.ac.uk>
To: debian-bugs@pixar.com
Subject: Re: Bug#1496: dpkg returns to dselect on SIGSTOP

Kenny MacDonald writes ("Bug#1496: dpkg returns to dselect on SIGSTOP"):
> Package: dpkg
> Version: 0.9375-0
> 
> This happened under .75 and I don't know if it is still a problem
> under .77.  Ian, you'll know if you changed anything about this.

No, I haven't.

> I was using dselect for the first time (for real), and it is very,
> very nice.  However, while it was upgrading my bash.deb, it stopped to
> query about the confile '/etc/profile'.  Fair enough, it was
> different.  I chose the 'Z' (?) option to suspend and investigate for
> myself.  dpkg was then stopped, but instead of starting a shell, it
> returned to the dselect menu, after which I couldn't do anything, as
> dpkg was locked.

I had a bug report like this before.  Can you reproduce it ?  If you
have two .deb files which have different versions of a conffile in it
you can keep getting dpkg to prompt by editing the conffile once and
then never answering `y' as you install them alternately.

I can't reproduce the problem on my system.  I've tried it on the
console, in an xterm and on a serial terminal running a getty_ps
(hacked not to set SIGPIPE to SIG_IGN in the login process); I've
tried it with bash and with tcsh.  None of these things have been
helpful.

Is there anything at all odd about your configuration ?  What kernel
version do you have ?  I'm running 1.2.13, but the problem didn't
appear with 1.2.10 either.  What is /bin/sh on your system ?

> I had to quit dselect, manually kill dpkg, find and remove the lock
> file, and then start dselect again.  The good news is that my system
> survived the whole episode intact!  Phew :)

I should hope it survived the episode.  If you find that dselect
and/or dpkg don't recover the system properly when they die or are
killed then that is a bug - though you may need to reinstall some .deb
files to get all the packages in sane and consistent states.

Ian.

Message received at debian-bugs:

From mail.glg.ed.ac.uk!kenny Wed Sep 27 05:26:20 1995
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From: Kenny MacDonald <kenny@mail.glg.ed.ac.uk>
To: debian-bugs@pixar.com
Subject: dpkg returns to dselect on SIGSTOP

Package: dpkg
Version: 0.9375-0

This happened under .75 and I don't know if it is still a problem
under .77.  Ian, you'll know if you changed anything about this.

I was using dselect for the first time (for real), and it is very,
very nice.  However, while it was upgrading my bash.deb, it stopped to
query about the confile '/etc/profile'.  Fair enough, it was
different.  I chose the 'Z' (?) option to suspend and investigate for
myself.  dpkg was then stopped, but instead of starting a shell, it
returned to the dselect menu, after which I couldn't do anything, as
dpkg was locked.

I had to quit dselect, manually kill dpkg, find and remove the lock
file, and then start dselect again.  The good news is that my system
survived the whole episode intact!  Phew :)

Kenny.