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Date: Wed, 15 Jul 2009 22:04:59 +0100
From: Jamie Lokier <jamie@shareable.org>
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Subject: [Qemu-devel] qcow2 relative paths (was: [PATCH] rev5: support colon
	in filenames)
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To: Ram Pai <linuxram@us.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Jan Kiszka <jan.kiszka@siemens.com>, Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org, kvm-devel <kvm@vger.kernel.org>

Ram Pai wrote:
> I have successfully verified qcow2 files. But then I may not be trying
> out the exact thing that you are talking about. Can you give me a test 
> case that I can verify.

Commands tried with qemu-0.10.0-1ubuntu1:

$ mkdir unlikely_subdir
$ cd unlikely_subdir
$ qemu-img create -f qcow2 backing.img 10
Formatting 'backing.img', fmt=qcow2, size=10 kB
$ qemu-img create -f qcow2 -b ../unlikely_subdir/backing.img main.img 10
Formatting 'main.img', fmt=qcow2, backing_file=../unlikely_subdir/backing.img, size=10 kB
$ cd ..
$ qemu-img info unlikely_subdir/main.img 
image: unlikely_subdir/main.img
file format: qcow2
virtual size: 10K (10240 bytes)
disk size: 16K
cluster_size: 4096
highest_alloc: 16384
backing file: ../unlikely_subdir/backing.img (actual path: unlikely_subdir/../unlikely_subdir/backing.img)

See especially the "actual path" line.

$ mv unlikely_subdir other_subdir
$ ls -l other_subdir
total 32
-rw-r--r-- 1 jamie jamie 16384 2009-07-15 21:59 backing.img
-rw-r--r-- 1 jamie jamie 16384 2009-07-15 21:59 main.img
$ qemu-img info other_subdir/main.img 
qemu-img: Could not open 'other_subdir/main.img'

What an unhelpful error message...  There isn't even a way to find out
the backing file path which the tool is looking for.

> And one other thing. Let me know if there a test-suite that I can try
> for regressions.

Sorry, I don't know anything about any QEMU test suites.

-- Jamie