### FIND_IMAGE_FORMAT and FIND_PROTOCOL lines are just debugging messages
### which do not appear in the patch.

### created loop block devices using dd (of exising images) and losetup
### /dev/loop0 is of format qcow2
### /dev/loop2 is of format raw

### qcow2 format over block devices
### qemu-img with -f
$ qemu-img info -f qcow2 /dev/loop0
image: /dev/loop0
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 0
cluster_size: 4096

### using the new fmt "protocol"
$ qemu-img info fmt:qcow2:/dev/loop0
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
image: fmt:qcow2:/dev/loop0
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: unavailable
cluster_size: 4096

### no format -- does not probe -- set to host_device
###           -- will fail to boot
$ qemu-img info /dev/loop0
FIND_IMAGE_FORMAT filename=/dev/loop0
FIND_IMAGE_FORMAT filename=/dev/loop0 is a host_device
image: /dev/loop0
file format: host_device
virtual size: 4.0G (4347179008 bytes)
disk size: 0

### creating a qcow image using new fmt "protocol"
$ qemu-img create -b fmt:qcow2:/dev/loop0 -f qcow2 /tmp/uuu.qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
Formatting '/tmp/uuu.qcow2', fmt=qcow2, backing_file=fmt:qcow2:/dev/loop0, size=20971520 kB

$ qemu-img info -f qcow2 /tmp/uuu.qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
image: /tmp/uuu.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 96K
cluster_size: 4096
backing file: fmt:qcow2:/dev/loop0 (actual path: fmt:qcow2:/dev/loop0)

### creating an image with a relative backing file
$ pushd /tmp/images/ > /dev/null
$ qemu-img  create -b fmt:qcow2:../uuu.qcow2 -f qcow2 ./uuu.qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:../uuu.qcow2
FIND_PROTOCOL filename=qcow2:../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
Formatting './uuu.qcow2', fmt=qcow2, backing_file=fmt:qcow2:../uuu.qcow2, size=20971520 kB

$ popd > /dev/null
$ qemu-img info  -f qcow2 /tmp/images/uuu.qcow2 
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
image: /tmp/images/uuu.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 96K
cluster_size: 4096
backing file: fmt:qcow2:../uuu.qcow2 (actual path: fmt:qcow2:/tmp/images/../uuu.qcow2)

### probing leaf image
$ qemu-img info /tmp/images/uuu.qcow2
FIND_IMAGE_FORMAT filename=/tmp/images/uuu.qcow2
FIND_IMAGE_FORMAT filename=/tmp/images/uuu.qcow2 PROBING
FIND_IMAGE_FORMAT filename=/tmp/images/uuu.qcow2 PROBING found qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
image: /tmp/images/uuu.qcow2
file format: qcow2
virtual size: 20G (21474836480 bytes)
disk size: 96K
cluster_size: 4096
backing file: fmt:qcow2:../uuu.qcow2 (actual path: fmt:qcow2:/tmp/images/../uuu.qcow2)


### raw format over file
$ qemu-img create -f raw /tmp/image1.raw 10G
Formatting '/tmp/image1.raw', fmt=raw, size=10485760 kB

### using new "fmt" "protocol" -- no probing
$ qemu-img create -b fmt:raw:/tmp/image1.raw -f qcow2 /tmp/image1.qcow2
FIND_IMAGE_FORMAT filename=fmt:raw:/tmp/image1.raw
FIND_PROTOCOL filename=raw:/tmp/image1.raw found format raw
FIND_IMAGE_FORMAT filename=fmt:raw:/tmp/image1.raw found format raw
Formatting '/tmp/image1.qcow2', fmt=qcow2, backing_file=fmt:raw:/tmp/image1.raw, size=10485760 kB

### probing only qcow image (not raw backing file)
$ qemu-img info /tmp/image1.qcow2
FIND_IMAGE_FORMAT filename=/tmp/image1.qcow2
FIND_IMAGE_FORMAT filename=/tmp/image1.qcow2 PROBING
FIND_IMAGE_FORMAT filename=/tmp/image1.qcow2 PROBING found qcow2
FIND_IMAGE_FORMAT filename=fmt:raw:/tmp/image1.raw
FIND_PROTOCOL filename=raw:/tmp/image1.raw found format raw
FIND_IMAGE_FORMAT filename=fmt:raw:/tmp/image1.raw found format raw
image: /tmp/image1.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 56K
cluster_size: 4096
backing file: fmt:raw:/tmp/image1.raw (actual path: fmt:raw:/tmp/image1.raw)


### raw format over host device
$ qemu-img info /dev/loop2
FIND_IMAGE_FORMAT filename=/dev/loop2
FIND_IMAGE_FORMAT filename=/dev/loop2 is a host_device
image: /dev/loop2
file format: host_device
virtual size: 300M (314572800 bytes)
disk size: 0

### use new "fmt" "protocol" -- no real need as qemu sets host_device anyways
$ qemu-img create -b fmt:host_device:/dev/loop2 -f qcow2 /tmp/mydsl.qcow2
Formatting '/tmp/mydsl.qcow2', fmt=qcow2, backing_file=fmt:host_device:/dev/loop2, size=307200 kB

$ qemu-img info -f qcow2 /tmp/mydsl.qcow2
image: /tmp/mydsl.qcow2
file format: qcow2
virtual size: 300M (314572800 bytes)
disk size: 16K
cluster_size: 4096
backing file: fmt:host_device:/dev/loop2 (actual path: fmt:host_device:/dev/loop2)\

### run with probing (only upmost image)
$ qemu-system-x86_64 -hda /tmp/mydsl.qcow2
FIND_IMAGE_FORMAT filename=/tmp/mydsl.qcow2
FIND_IMAGE_FORMAT filename=/tmp/mydsl.qcow2 PROBING
FIND_IMAGE_FORMAT filename=/tmp/mydsl.qcow2 PROBING found qcow2
FIND_IMAGE_FORMAT filename=fmt:host_device:/dev/loop2
FIND_PROTOCOL filename=host_device:/dev/loop2 found format host_device
FIND_IMAGE_FORMAT filename=fmt:host_device:/dev/loop2 found format host_device


###  run with no probing (using -drive format)
$ qemu-system-x86_64 -drive file=/tmp/mydsl.qcow2,format=qcow2
FIND_IMAGE_FORMAT filename=fmt:host_device:/dev/loop2
FIND_PROTOCOL filename=host_device:/dev/loop2 found format host_device
FIND_IMAGE_FORMAT filename=fmt:host_device:/dev/loop2 found format host_device

### mydsl2 with no fmt, set host_device format for /dev/loop2 (no probing for host devices)
$ qemu-img create -b /dev/loop2 -f qcow2 /tmp/mydsl2.qcow2
FIND_IMAGE_FORMAT filename=/dev/loop2
FIND_IMAGE_FORMAT filename=/dev/loop2 is a host_device
Formatting '/tmp/mydsl2.qcow2', fmt=qcow2, backing_file=/dev/loop2, size=307200 kB

$ qemu-img info -f qcow2 /tmp/mydsl2.qcow2
FIND_IMAGE_FORMAT filename=/dev/loop2
FIND_IMAGE_FORMAT filename=/dev/loop2 is a host_device
image: /tmp/mydsl2.qcow2
file format: qcow2
virtual size: 300M (314572800 bytes)
disk size: 16K
cluster_size: 4096
backing file: /dev/loop2 (actual path: /dev/loop2)

#### testing nbd together with "fmt"
$ qemu-nbd -v -n --snapshot -t -k /tmp/uuu.socket fmt:qcow2:/tmp/images/uuu.qcow2 &
[1] 31292
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=/tmp/vl.uXmIKt
FIND_IMAGE_FORMAT filename=/tmp/vl.uXmIKt PROBING
FIND_IMAGE_FORMAT filename=/tmp/vl.uXmIKt PROBING found qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2
FIND_PROTOCOL filename=qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/tmp/images/../uuu.qcow2 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2

### info works
$ qemu-img info nbd:unix:/tmp/uuu.socket
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING found nbd
image: nbd:unix:/tmp/uuu.socket
file format: nbd
virtual size: 20G (21474836480 bytes)
disk size: unavailable

$ qemu-system-x86_64 -snapshot -hda nbd:unix:/tmp/uuu.socket
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING found nbd
FIND_IMAGE_FORMAT filename=/tmp/vl.C1NTVv
FIND_IMAGE_FORMAT filename=/tmp/vl.C1NTVv PROBING
FIND_IMAGE_FORMAT filename=/tmp/vl.C1NTVv PROBING found qcow2
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING
FIND_PROTOCOL filename=nbd:unix:/tmp/uuu.socket: found protocol nbd
FIND_IMAGE_FORMAT filename=nbd:unix:/tmp/uuu.socket PROBING found nbd
### <running>

$ kill %1
$ /bin/rm -f /tmp/uuu.socket


### checking vvfat:
$ qemu-system-x86_64 -hda /tmp/uuu.qcow2 -hdb fat:floppy:/tmp/images
FIND_IMAGE_FORMAT filename=/tmp/uuu.qcow2
FIND_IMAGE_FORMAT filename=/tmp/uuu.qcow2 PROBING
FIND_IMAGE_FORMAT filename=/tmp/uuu.qcow2 PROBING found qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0
FIND_PROTOCOL filename=qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fmt:qcow2:/dev/loop0 found format qcow2
FIND_IMAGE_FORMAT filename=fat:floppy:/tmp/images
FIND_PROTOCOL filename=fat:floppy:/tmp/images: found protocol fat
### <running>