On 2024-04-25 14:51, lacsaP Patatetom wrote:
Le jeu. 25 avr. 2024 à 11:30, Peter Maydell <peter.mayd...@linaro.org
<mailto:peter.mayd...@linaro.org>> a écrit :
On Thu, 25 Apr 2024 at 09:55, lacsaP Patatetom
<patate...@gmail.com <mailto:patate...@gmail.com>> wrote:
>
> hi,
>
> when using `qemu-img create`, why do I have to specify the
format of the base image ?
> can't `qemu-img` detect it itself ?
Image format detection isn't 100% reliable. Notably, a 'raw'
format image could in theory look like any of the other
image types if it happens to start with the right kind of data.
thanks
-- PMM
OK for the raw format, which can be anything, but not for the qcow2
format, which is standardized (header).
in the absence of details, `qemu-img` could use the qcow2 format by
default ?
qemu-img create [-b base [-F (qcow2*|raw)]] [-f (qcow2*|raw)] image [size]
But it cannot safely tell if the base file (usually a raw image or raw
physical
disk partition) is qcow2 or araw file that just happens to begin with
the magic
bytes that represent qcow2.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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