Re: [Qemu-devel] [PATCH 0/2] block: Propagate error in bdrv_img_create()

[Stefan Hajnoczi]

On Mon, Oct 27, 2014 at 01:30:07PM +0100, Max Reitz wrote:
> Currently, when trying to create a backed image without specifying its
> size, when the backing file does not exist or is not accessible, an
> appropriate error message will be generated which is then (in
> bdrv_img_create()) prefixed with the image file name and the strerror().
> However, both are generally already part of the bdrv_open() error
> message, so we should not double this information. An example:
> 
> $ qemu-img create -f qcow2 -b /tmp/enoent /tmp/img.qcow2
> qemu-img: /tmp/img.qcow2: Could not open '/tmp/enoent': Could not open
> '/tmp/enoent': No such file or directory: No such file or directory
> 
> Just propagating the error is sufficient:
> 
> $ qemu-img create -f qcow2 -b /tmp/enoent /tmp/img.qcow2
> qemu-img /tmp/img.qcow2: Could not open '/tmp/enoent': No such file or
> directory
> 
> 
> Max Reitz (2):
>   block: Propagate error in bdrv_img_create()
>   iotests: Add test for non-existing backing file
> 
>  block.c                    |  5 -----
>  tests/qemu-iotests/111     | 53 
> ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/111.out |  3 +++
>  tests/qemu-iotests/group   |  1 +
>  4 files changed, 57 insertions(+), 5 deletions(-)
>  create mode 100755 tests/qemu-iotests/111
>  create mode 100644 tests/qemu-iotests/111.out

Eric: Leaving "inexistent".  It is in several dictionaries besides
Wiktionary :).

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan

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