[Qemu-devel] Re: qcow2 relative paths

[Jan Kiszka <jan.kiszka@web.de>]

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Jamie Lokier wrote:
> 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.

strace :p

But I feel your pain. This screams for better error reporting.

> 
>> 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.

There is kvm autotest, but that's testing at a coarser level. Well,
Anthony promised to push some unit test framework for QEMU...

Jan


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