Pkg xen devel - Jul 2012 - Bug#681376: Xen hypervisor package not upgraded on dist-upgrade Squeeze to Wheezy

Package: src:xen
Severity: important
Version: 4.1.3~rc1+hg-20120614.a9c0a89c08f2-2

I recently upgrade from Squeeze to Wheezy on a system which had the
xen-linux-system-686-pae metapackage (one of two which Provides:
xen-linux-system). After dist-upgrade I had the new xen-utils-common and
xenstore-utils (and a few others) but not the xen-utils-4.1 or
xen-hypervisor-4.1-i386 or xen-hypervisor-amd64 package. (dpkg -l
"*xen*" output is below).

I have marked this bug important since I think failure to upgrade is "a
major effect on the usability of a package".

I think this is because the dependency chain is:
xen-linux-system-686-pae
 -> xen-linux-system-3.2.0-3-686-pae
   -> xen-hypervisor-amd64 | xen-hypervisor-i386

Where xen-hypervisor-{amd64,i386} are virtual packages provided by the
real xen-hypervisor-{4.0,4.1}-{amd64,i386}. The problem seems to be that
the Depends remains satisfied by the 4.0 version and therefore the 4.1
version is not installed as expected.

One possible solution would be to turn those virtual packages into real
ones, at which point I expect the versioning would cause the expected
upgrade. I hope to take a look at this soon and check that it actually
works. I notice that linux-image-amd64 (the approx equivalent to
xen-hypervisor-amd64 for the kernel) is not pure virtual so I think this
makes sense..

At the very least this issue needs to be added to the release notes
since the is currently an extra manual step required during upgrade.

Ian.


root at calder:~# dpkg -l "*xen*"
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                            Version                         Description
+++-===============================-===============================-=============================================================================ii
libc6-xen:i386                  2.13-33                         Embedded GNU C
Library: Shared libraries [Xen version]
ii  libxen-4.1                      4.1.3~rc1+hg-20120614.a9c0a89c0 Public libs
for Xen
ii  libxenstore3.0                  4.1.3~rc1+hg-20120614.a9c0a89c0 Xenstore
communications library for Xen
un  linux-image-2.6-xen-686         <none>                          (no
description available)
ii  linux-image-2.6.32-5-xen-686    2.6.32-45                       Linux 2.6.32
for modern PCs, Xen dom0 support
un  linux-modules-2.6.32-5-xen-686  <none>                          (no
description available)
un  xen-docs-4.0                    <none>                          (no
description available)
un  xen-hypervisor                  <none>                          (no
description available)
un  xen-hypervisor-4.0              <none>                          (no
description available)
ii  xen-hypervisor-4.0-amd64        4.0.1-4                         The Xen
Hypervisor on AMD64
rc  xen-hypervisor-4.0-i386         4.0.1-4                         The Xen
Hypervisor on i386
un  xen-hypervisor-amd64            <none>                          (no
description available)
un  xen-hypervisor-i386             <none>                          (no
description available)
un  xen-linux-system                <none>                          (no
description available)
ii  xen-linux-system-2.6-xen-686    3.2+45                          Xen system
with Linux for modern PCs (dummy package)
ii  xen-linux-system-2.6.32-5-xen-6 2.6.32-45                       Xen system
with Linux 2.6.32 on modern PCs (meta-package)
ii  xen-linux-system-3.2.0-3-686-pa 3.2.21-3                        Xen system
with Linux 3.2 on modern PCs (meta-package)
ii  xen-linux-system-686-pae        3.2+45                          Xen system
with Linux for modern PCs (meta-package)
un  xen-qemu-dm                     <none>                          (no
description available)
ii  xen-qemu-dm-4.0                 4.0.1-2+squeeze1                Xen Qemu
Device Model virtual machine hardware emulator
un  xen-tools                       <none>                          (no
description available)
un  xen-utils                       <none>                          (no
description available)
ii  xen-utils-4.0                   4.0.1-4                         XEN
administrative tools
ii  xen-utils-common                4.1.3~rc1+hg-20120614.a9c0a89c0 Xen
administrative tools - common files
ii  xenstore-utils                  4.1.3~rc1+hg-20120614.a9c0a89c0 Xenstore
utilities for Xen

tags 681376 +patch
thanks

On Thu, 2012-07-12 at 12:37 -0600, Ian Campbell wrote:
> One possible solution would be to turn those virtual packages into real
> ones, at which point I expect the versioning would cause the expected
> upgrade.
Perhaps inevitably this wasn't quite sufficient. The problem is that
even if xen-hypervisor-amd64 becomes a real package on upgrade the
dependency is already satisfied by xen-hypervisor-4.0-amd64 so apt
doesn't do the upgrade.

I can't really think of a solution for this in Wheezy. However what we
can, and I think should, do for Wheezy is to add an explicit real
package "xen-hypervisor-latest-ARCH". It will still require manual
action on upgrade to Wheezy but things should then Just Work for Wheezy
+1.

Also the xen-linux-system-* packages should include the latest package
as the preferred alternative.

Ian.
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Processing commands for control at bugs.debian.org:
> tags 681376 +patch
Bug #681376 [src:xen] Xen hypervisor package not upgraded on dist-upgrade
Squeeze to Wheezy
Added tag(s) patch.
> thanks
Stopping processing here.

Please contact me if you need assistance.
-- 
681376: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=681376
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems

On Thu, Jul 12, 2012 at 12:37:52PM -0600, Ian Campbell
wrote:
> I recently upgrade from Squeeze to Wheezy on a system which had the
> xen-linux-system-686-pae metapackage (one of two which Provides:
> xen-linux-system). After dist-upgrade I had the new xen-utils-common and
> xenstore-utils (and a few others) but not the xen-utils-4.1 or
> xen-hypervisor-4.1-i386 or xen-hypervisor-amd64 package. (dpkg -l
> "*xen*" output is below).
> 
> I have marked this bug important since I think failure to upgrade is
"a
> major effect on the usability of a package".
Please show the actual error. The old versions should still work without
problems. While this is no ideal state, it is not broken by itself.

Wheezy will be the first release where there will be some sort of cross
compatibility. So an automatic upgrade can work.
> I think this is because the dependency chain is:
> xen-linux-system-686-pae
>  -> xen-linux-system-3.2.0-3-686-pae
>    -> xen-hypervisor-amd64 | xen-hypervisor-i386
There is no dependency for the utils package.
> At the very least this issue needs to be added to the release notes
> since the is currently an extra manual step required during upgrade.
There is no change from earlier releases, so it does not really need it.

Bastian

-- 
Fascinating, a totally parochial attitude.
		-- Spock, "Metamorphosis", stardate 3219.8

On Sat, 2012-07-14 at 19:59 +0200, Bastian Blank wrote:
> On Thu, Jul 12, 2012 at 12:37:52PM -0600, Ian Campbell wrote:
> > I recently upgrade from Squeeze to Wheezy on a system which had the
> > xen-linux-system-686-pae metapackage (one of two which Provides:
> > xen-linux-system). After dist-upgrade I had the new xen-utils-common
and
> > xenstore-utils (and a few others) but not the xen-utils-4.1 or
> > xen-hypervisor-4.1-i386 or xen-hypervisor-amd64 package. (dpkg -l
> > "*xen*" output is below).
> > 
> > I have marked this bug important since I think failure to upgrade is
"a
> > major effect on the usability of a package".
> 
> Please show the actual error. The old versions should still work without
> problems. While this is no ideal state, it is not broken by itself.
The error is that after upgrade the system has only the Squeeze version
of Xen and not the new Wheezy version unless the administrator takes
manual steps. They should not have to do this.
> Wheezy will be the first release where there will be some sort of cross
> compatibility. So an automatic upgrade can work.
> 
> > I think this is because the dependency chain is:
> > xen-linux-system-686-pae
> >  -> xen-linux-system-3.2.0-3-686-pae
> >    -> xen-hypervisor-amd64 | xen-hypervisor-i386
> 
> There is no dependency for the utils package.
If the upgrade works correctly for xen-hypervisor-FOO then the matching
utils will get installed due to the recommends from
xen-hypervisor-4.1-FOO
> > At the very least this issue needs to be added to the release notes
> > since the is currently an extra manual step required during upgrade.
> 
> There is no change from earlier releases, so it does not really need it.
Well even better is if there is no manual step needed at all, which
would be my preference.

Ian.

Your message dated Mon, 30 Jul 2012 21:33:43 +0000
with message-id <E1Svxax-0006Xq-H8 at franck.debian.org>
and subject line Bug#681376: fixed in xen 4.1.3~rc1+hg-20120614.a9c0a89c08f2-5
has caused the Debian Bug report #681376,
regarding Xen hypervisor package not upgraded on dist-upgrade Squeeze to Wheezy
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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-- 
681376: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=681376
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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On 07/13/2012 02:37 AM, Ian Campbell wrote:
> I have marked this bug important since I think failure to upgrade is
"a
> major effect on the usability of a package".
A failure to upgrade might as well be considered a violation of the
policy and deserve a Serious severity. I'd agree if this was an RC bug.

On the upgrade from Lenny to Squeeze, we had the same trouble, having to
manually apt-get install packages. It wouldn't be nice to have to write
in the release notes *again*.

Thomas