Converting Debian OpenStack images to btrfs

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

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Hello!

I'm using Debian's OpenStack images to deploy buildd hosts for Debian
Ports. [1]

To workaround a longstanding qemu/glibc compatibility issue [2], I need
the images to use btrfs instead of ext4 and I was wondering whether anyone
can give me some hints on how to convert the images provided at [1] from
ext4 to btrfs.

Thanks,
Adriam

> [1] https://cloud.debian.org/cdimage/cloud/OpenStack/
> [2] https://sourceware.org/bugzilla/show_bug.cgi?id=23960

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