[Bug 658610] Re: Check whether images have write permissions

[Anthony Liguori]

This is a legacy behavior in QEMU.  There are a number of legitimate use
cases where a user may only have read access to an image and as long as
that image is mounted read-only, everything will work okay.

Virtio and SCSI will expose the read-only attribute to the guest so it
should be very obvious what's happening.  Unfortunately, IDE does not
support the concept of read-only.

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https://bugs.launchpad.net/bugs/658610

Title:
  Check whether images have write permissions