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Re: [Qemu-devel] [PATCH] rev3: support colon in filenames

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] rev3: support colon in filenames
Date: Thu, 02 Jul 2009 07:52:22 -0500
User-agent: Thunderbird (X11/20090320)

Kevin Wolf wrote:
Ram Pai schrieb:
Problem: It is impossible to feed filenames with the character colon because
qemu interprets such names as a protocol. For example filename scsi:0, is
interpreted as a protocol by name "scsi".

This patch allows user to escape colon characters. For example the above
filename can now be expressed either as 'scsi\:0' or as file:scsi:0

anything following the "file:" tag is interpreted verbatim. However if "file:"
tag is omitted then any colon characters in the string must be escaped using

Anthony has already committed version 2 of the patch, so this one
doesn't apply any more.

By the way, I'm still not convinced that this use of backslashes gives
us anything but yet another special character that worked just fine
before. I guess this is going to be annoying for Windows users.

It ends up working out for Windows users because colons are invalid in Windows file names.

What's the solution to this problem is we don't escape?

fat:c:\path\to\dir\:floppy\:  is a fat file by name \path\to\dir:floppy:
NOTE:The above example cannot be expressed using the "file:" protocol.

And it doesn't need to. It's already expressed using the "fat:"
protocol, so we won't accidentally mistake c for the protocol name.

You might have a point with a directory named :floppy: or so.

For 0.12, maybe we should take a hard look at refactoring -drive and completely splitting this stuff. I think we ought to come up with a syntax where we can pass file names as independent arguments so that no special escaping is required.


Anthony Liguori

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