Bug#812581: qemu complains about missing image format

[Yuri D'Elia]

Package: qemubuilder
Version: 0.78
Severity: minor

The following warnings are visible when qemu/kvm is started:

  forking qemu: kvm -nodefaults -nographic -M pc -m 1024 -kernel /var/cache/pbuilder/kernel/debian-live-8.2.0-amd64-standard.vmlinuz -initrd /var/cache/pbuilder/kernel/debian-live-8.2.0-amd64-standard.initrd.img -drive file=/var/cache/pbuilder/base.qemu,index=0,media=disk,cache=writeback,id=hd0 -drive file=/var/cache/pbuilder/build/qemu.29814.dev,index=1,media=disk,cache=writeback,id=hd1 -append root=/dev/sda quiet init=/pbuilder-run console=ttyS0,115200n8 -serial stdio -net user -net nic 
WARNING: Image format was not specified for '/var/cache/pbuilder/base.qemu' and probing guessed raw.
         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.
WARNING: Image format was not specified for '/var/cache/pbuilder/build/qemu.29814.dev' and probing guessed raw.
         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.
         Specify the 'raw' format explicitly to remove the restrictions.