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Re: [Qemu-devel] [PATCH] Add HTTP protocol using curl v2

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH] Add HTTP protocol using curl v2
Date: Wed, 06 May 2009 11:14:17 +0200
User-agent: Thunderbird (X11/20090320)

Daniel P. Berrange schrieb:
> On Wed, May 06, 2009 at 03:00:50AM +0200, address@hidden wrote:
>> From: Alexander Graf <address@hidden>
>> Currently Qemu can read from posix I/O and NBD. This patch adds a
>> third protocol to the game: HTTP.
>> In certain situations it can be useful to access HTTP data directly,
>> for example if you want to try out an http provided OS image, but
>> don't know if you want to download it yet.
>> Using this patch you can now try it on on the fly. Just use it like:
>> qemu -cdrom http://host/path/my.iso
> I rather think there should be an explicit flag to allow use of http://
> URLs in filenames at runtime, not just 'configure' time. There are many
> apps out there using QEMU which will be assuming QEMU treats all disk
> paths as local files, and thus not got explicit code to check whether 
> a URI is passed. I could well see that some will consider it a security
> issue to allow QEMU to download off the net, but if they updated to
> a new QEMU with this patch, downloading would be allowed by default.

If apps want to be sure that they are accessing a local file, they must
ensure not to have a colon in the file name. Otherwise this specifies a
protocol for the qemu block layer.

Btw, we could use a way to escape colons in a file name. Using such
files isn't possible currently.

> Perhaps only enable these remote URIs with the -drive parameter, when
> an explicit fmt=http option is set. But can this be layered into the
> other protocols, eg could the remote URI be in qcow, vmdk, etc formats,
> or are you assuming the remote uri is raw file ?

It should work with all formats. This is why fmt=http is wrong. It's not
a format, but a protocol.


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