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$ git describe
pull-util-2017-02-23-603-gb7ee9a6
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$ git fetch git://repo.or.cz/qemu/armbru.git pull-block-2017-02-28-v2
remote: Counting objects: 100, done.
remote: Compressing objects: 100% (100/100), done.
remote: Total 100 (delta 68), reused 0 (delta 0)
Receiving objects: 100% (100/100), 178.26 KiB | 0 bytes/s, done.
Resolving deltas: 100% (68/68), done.
From git://repo.or.cz/qemu/armbru
 * tag               pull-block-2017-02-28-v2 -> FETCH_HEAD
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$ git checkout -b test3-blockdev-armbru pull-block-2017-02-28-v2
M       dtc
M       roms/SLOF
M       roms/ipxe
M       roms/openbios
M       roms/qemu-palcode
M       roms/seabios
Switched to a new branch 'test3-blockdev-armbru'
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$ git describe
pull-block-2017-02-28-v2
-----------------------------------------------------------------------

* Build QEMU

-----------------------------------------------------------------------

* Launch the below QEMU command-line

$ ~/build/blockdev-cmd-line-qemu-06MAR2017/x86_64-softmmu/qemu-system-x86_64 -display none -nodefconfig -nodefaults -m 512 -device virtio-scsi-pci,id=scsi -device virtio-serial-pci -blockdev node-name=foo,driver=qcow2,file.driver=file,file.filename=./base.qcow2 -monitor stdio -qmp unix:./qmp-sock,server,nowait
QEMU 2.8.50 monitor - type 'help' for more information
(qemu) 

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(QEMU) query-version
{
    "execute": "query-version", 
    "arguments": {}
}
{
    "return": {
        "qemu": {
            "micro": 50, 
            "major": 2, 
            "minor": 8
        }, 
        "package": " (v2.8.0-2056-g3a79d43-dirty)"
    }
}
(QEMU) 
(QEMU) query-named-block-nodes
{
    "execute": "query-named-block-nodes", 
    "arguments": {}
}
{
    "return": [
        {
            "bps_rd": 0, 
            "ro": false, 
            "backing_file_depth": 0, 
            "encrypted": false, 
            "image": {
                "cluster-size": 65536, 
                "format": "qcow2", 
                "filename": "./base.qcow2", 
                "virtual-size": 41126400, 
                "dirty-flag": false, 
                "format-specific": {
                    "data": {
                        "compat": "0.10", 
                        "refcount-bits": 16
                    }, 
                    "type": "qcow2"
                }, 
                "actual-size": 19886080
            }, 
            "cache": {
                "no-flush": false, 
                "writeback": true, 
                "direct": false
            }, 
            "bps_wr": 0, 
            "drv": "qcow2", 
            "node-name": "foo", 
            "bps": 0, 
            "iops": 0, 
            "write_threshold": 0, 
            "file": "./base.qcow2", 
            "iops_rd": 0, 
            "encryption_key_missing": false, 
            "detect_zeroes": "off", 
            "iops_wr": 0
        }, 
        {
            "bps_rd": 0, 
            "ro": false, 
            "backing_file_depth": 0, 
            "encrypted": false, 
            "image": {
                "dirty-flag": false, 
                "format": "file", 
                "virtual-size": 19922944, 
                "actual-size": 19886080, 
                "filename": "./base.qcow2"
            }, 
            "cache": {
                "no-flush": false, 
                "writeback": true, 
                "direct": false
            }, 
            "bps_wr": 0, 
            "drv": "file", 
            "node-name": "#block038", 
            "bps": 0, 
            "iops": 0, 
            "write_threshold": 0, 
            "file": "./base.qcow2", 
            "iops_rd": 0, 
            "encryption_key_missing": false, 
            "detect_zeroes": "off", 
            "iops_wr": 0
        }
    ]
}
(QEMU)
-----------------------------------------------------------------------