Bug 801970

Summary:	libvirt with QEmu does not support disk filenames with comma
Product:	Red Hat Enterprise Linux 6	Reporter:	Eric Blake <eblake>
Component:	libvirt	Assignee:	Eric Blake <eblake>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	6.3	CC:	acathrow, bugproxy, crobinso, dallan, dyuan, eblake, jdenemar, juzhang, mshao, mzhan, rwu, vianac, weizhan, xen-maint, ydu
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	libvirt-0.9.10-5.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	801036	Environment:
Last Closed:	2012-06-20 06:49:54 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	801036
Bug Blocks:

Description Eric Blake 2012-03-10 00:44:00 UTC

Cloning to RHEL

+++ This bug was initially created as a clone of Bug #801036 +++

There's no way to specify a disk filename with comma on libvirt with QEmu.

QEmu supports filenames with comma by using a double comma (e.g. "file=virtual,,disk.img" is parsed by QEmu as the file virtual,disk.img). However this does not happen with libvirt. If you specify <source file="virtual,disk.img" />, libvirt will pass the exact name to QEmu, which is an error to QEmu; if you specify <source file="virtual,,disk.img" />, libvirt interprets as a literal name and reports a "no such file" error even before talking to QEmu.

Tested on libvirt-0.8.7-18.el6_1.4.x86_64.

How reproducible:
Always.

Steps to Reproduce:
1. Create an image file with a comma in the name (e.g. virtual,disk.img).
2. Create a QEmu VM with libvirt specifying that file as the disk.
3. Start the VM.
  
Actual results:
The file cannot be found.

Expected results:
The file should be found because it exists and QEmu supports that.

--- Additional comment from dallan on 2012-03-07 09:28:44 MST ---

TBH, this capability isn't something that I've seen a lot of people asking for, but if you need it and are willing to put together a patch, I doubt it would be controversial upstream, and the code probably isn't too complex.  Is that something that you'd be willing to take on?

--- Additional comment from vianac.ibm.com on 2012-03-07 10:22:11 MST ---

Yes, I'll work on a patch for it.

--- Additional comment from dallan on 2012-03-07 10:55:58 MST ---

Great, thank you.  If you haven't already, have a look at http://libvirt.org/hacking.html as there is some good advice there that can potentially save you a lot of time/work.

--- Additional comment from bugproxy.com on 2012-03-07 12:31:04 MST ---

------- Comment From sglass.com 2012-03-07 14:21 EDT-------
---Problem Description---

QEmu supports filenames with comma by using a double comma (e.g.
"file=virtual,,disk.img" is parsed by QEmu as the file virtual,disk.img).
However this does not happen with libvirt. If you specify <source
file="virtual,disk.img" />, libvirt will pass the exact name to QEmu, which is
an error to QEmu; if you specify <source file="virtual,,disk.img" />, libvirt
interprets as a literal name and reports a "no such file" error even before
talking to QEmu.

Contact Information = Anthony Liguori

---uname output---
n/a

Machine Type = n/a

---Debugger---
A debugger is not configured

---KVM Component Data---

--- Additional comment from eblake on 2012-03-09 17:43:19 MST ---

Upstream patch awaiting review: https://www.redhat.com/archives/libvir-list/2012-March/msg00420.html

Comment 1 Eric Blake 2012-03-12 14:57:55 UTC

In POST:
http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-March/msg01134.html

Comment 4 weizhang 2012-03-14 07:29:46 UTC

Verify pass on
kernel-2.6.32-250.el6.x86_64
qemu-kvm-0.12.1.2-2.246.el6.x86_64
libvirt-0.9.10-5.el6.x86_64

Start a guest with
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/var/lib/libvirt/images/tt,tt.img'/>
      <target dev='hda' bus='ide'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>

Domain started without error
qemu-kvm command
-drive file=/var/lib/libvirt/images/tt,,tt.img,if=none,id=drive-ide0-0-0,format=raw,cache=none 

Can reproduce on libvirt-0.9.10-4.el6.x86_64
Start guest will report error
error: Failed to start domain guest
error: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/var/lib/libvirt/images/tt,tt.img,if=none,id=drive-ide0-0-0,format=raw,cache=none: Invalid parameter 'tt.img

Comment 6 errata-xmlrpc 2012-06-20 06:49:54 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0748.html