indexerror in vmbuilder when partitionfile contains 2 columns or less

Bug #784888 reported by garo on 2011-05-18
This bug affects 1 person
Affects Status Importance Assigned to Milestone
vm-builder (Ubuntu)
Serge Hallyn

Bug Description

Binary package hint: python-vm-builder

SRU justification:
1. Impact: using a partition file which doesn't container *optional* elements causes failure.
2. How bug addressed: the code is patched to use a proper test for the presence of the optional elements. (Existing check was simply wrong)
3. Patch: See comment number 4
4. To reproduce:
cat > partfile << EOF
root 4000
swap 1000
vmbuilder xen ubuntu --part partfile
5. Regression potential: If the patch were wrong, other bugs in the parsing of the partfile could be introduced.

In 11.04 with python-vm-builder 0.12.4+bzr464-0ubuntu1, when you have a file vmbuilder.partition with 2 lines:
root 4000
swap 1000

and you run "vmbuilder xen ubuntu --suite natty --flavour virtual --arch amd64 -o --ip --hostname myvm --bridge virbr0 --part vmbuilder.partition --user user --name user --pass default" it will crash with this error:
Traceback (most recent call last):
  File "/usr/bin/vmbuilder", line 24, in <module>
  File "/usr/lib/python2.7/dist-packages/VMBuilder/contrib/", line 222, in main
  File "/usr/lib/python2.7/dist-packages/VMBuilder/contrib/", line 351, in set_disk_layout
    if not elements[3]:
IndexError: list index out of range

This is fixed with the patch i included

Serge Hallyn (serge-hallyn) wrote :

Thanks for taking the time to report this bug and helping to make Ubuntu better.

I will upload your patch (with one change - len(elements) check should be < 4, as elements[3] is the fourth option. I'll push that to oneiric, then SRU the fix to natty.

Changed in vm-builder (Ubuntu):
status: New → Confirmed
importance: Undecided → High
assignee: nobody → Serge Hallyn (serge-hallyn)
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package vm-builder - 0.12.4+bzr466-0ubuntu1

vm-builder (0.12.4+bzr466-0ubuntu1) oneiric; urgency=low

  * Fix from garo: If you provide a .partition file whose lines have < 4
    elements, vmbuilder would incorrectly (since the 3d and 4th parameters
    are optional) fail. (LP: #784888)
 -- Serge Hallyn <email address hidden> Wed, 18 May 2011 18:10:20 -0500

Changed in vm-builder (Ubuntu):
status: Confirmed → Fix Released
Serge Hallyn (serge-hallyn) wrote :
description: updated

Accepted vm-builder into natty-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See for documentation how to enable and use -proposed. Thank you in advance!

Changed in vm-builder (Ubuntu Natty):
status: New → Fix Committed
tags: added: verification-needed
Rolf Leggewie (r0lf) wrote :

natty has seen the end of its life and is no longer receiving any updates. Marking the natty task for this ticket as "Won't Fix".

Changed in vm-builder (Ubuntu Natty):
status: Fix Committed → Won't Fix
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