Re: [Qemu-devel] [PATCH] A different way to ask for readonly drive

[Jamie Lokier]

Kevin Wolf wrote:
> Am 17.12.2009 14:16, schrieb Jamie Lokier:
> You can decide to protect your images with the qemu readonly option and
> get the protection that qemu defines, or you take the permissions of the
> OS and get from the OS whatever the definition of that protection is
> (including write access for root).

Note that until the latest patch, "chmod 444" was the _the_ user
interface to this feature of qemu.  It's a bad interface, but it was
the only one available.  qemu is weird like that, having external
file permissions control an internal behaviour switch.

> qemu can't and shouldn't know that you use the OS's protection but
> actually don't quite mean what it's defined to be.

Then I concur with Christopher Hellwig, and we should drop the "auto"
behaviour entirely, and force the user interface to be the qemu
command line instead of "chmod" from now one.

-- Jamie