[Bug 915971] Re: New command "guestmount"

[Thierry Carrez]

guestmount (from libguestfs) was added as a method for mounting disk
images before doing operations on them. By default Nova tries to use
loop, then nbd, then guestfs (you can change the order using the
'img_handlers' flag). For COW images, it skips loop...

So it could be possible that you used COW images, hit an issue with NBD
and stumbled on the libguestfs code.

If for some reason guestmount can't be packaged in Ubuntu (or is an
unreasonable dependency), I guess we could set img_handlers = [ 'loop',
'nbd' ] in the nova.conf file we ship to avoid trying using guestmount
and error on the NBD failure instead...

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https://bugs.launchpad.net/bugs/915971

Title:
  New command "guestmount"

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