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Bug 1016360

Summary: Better error message for using read only driver as read-write with format probing
Product: Red Hat Enterprise Linux 6 Reporter: Fam Zheng <famz>
Component: qemu-kvmAssignee: Fam Zheng <famz>
Status: CLOSED DEFERRED QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.6CC: bsarathy, chayang, juzhang, michen, mkenneth, qzhang, rbalakri, sluo, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2014-12-15 09:34:47 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Fam Zheng 2013-10-08 03:04:57 UTC
If qemu tries to use a block driver as read write, but it is whitelisted for read-only, the error message is obscure and not instructive.

Actual results:

(configure with --block-drv-ro-whitelist=vmdk and build qemu)
$ qemu-kvm -nodefaults --enable-kvm -S -m 512 -vnc :0 -readconfig test.cfg -drive if=none,file=foo.vmdk
    qemu-kvm: -drive if=none,file=foo.vmdk: could not open disk image foo.vmdk: Operation not supported

A better message should be:

qemu-kvm: -drive if=none,file=foo.vmdk: format 'vmdk' is only supported read-only