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Description of problem:
The error info is not accurate when creating image just specifying size but not image file name

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.12.0-1.el7

How reproducible:
100%

Steps to Reproduce:
# qemu-img create -f qcow2 10G
qemu-img: 10G: Image creation needs a size parameter


Actual results:


Expected results:
The error info should be like as below:
qemu-img: Image creation needs a image file name
Try 'qemu-img --help' for more information

Additional info:

(In reply to Tingting Mao from comment #0)
> Description of problem:
> The error info is not accurate when creating image just specifying size but
> not image file name
> 
> Version-Release number of selected component (if applicable):
> qemu-kvm-rhev-2.12.0-1.el7
> 
> How reproducible:
> 100%
> 
> Steps to Reproduce:
> # qemu-img create -f qcow2 10G
> qemu-img: 10G: Image creation needs a size parameter
> 

In the command line above, there's nothing to indicate to qemu-img that 10G is the size. As far as it knows, "10G" is the name of the image and you're not providing the size.

I understand this might be confusing, but I'm closing this one because we need to focus on high priority issues.