Env
~~~

$ git describe
pull-misc-2017-03-28-27-g885750d
$ ./qemu-system-x86_64 -version
QEMU emulator version 2.8.92 (v2.9.0-rc1-110-g885750d)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

Result
~~~~~~

With the *fixed* build from Markus' branch
http://repo.or.cz/qemu/armbru.git/tree/refs/heads/blockdev-fixes-dbg,
all four tests succeed:

[OK] Test-1: Syntax: sheepdog:hostname:port:Alice
[OK] Test-2: Syntax: sheepdog://hostname:port/Alice
[OK] Test-3: Syntax: -drive if=none,driver=sheepdog,server.type=inet,server.host=hostname,server.port=port,vdi=Alice
[OK] Test-4: Syntax: -blockdev node-name=nn,driver=sheepdog,server.type=inet,server.host=host,server.port=port,vdi=Alice

Tests
~~~~~

Test-1: Syntax: sheepdog:hostname:port:Alice
-----------------------------------------------------------------------
$ ./qemu-system-x86_64 -display none -nodefconfig -nodefaults sheepdog:192.168.122.84:7000:Alice
@@@ server.host=192.168.122.84
@@@ server.port=7000
@@@ tag=
@@@ server.type=inet
@@@ vdi=Alice
### vdi=Alice addr=192.168.122.84:7000 snap-id=(null) tag=
WARNING: Image format was not specified for 'json:{"server.host": "192.168.122.84", "server.port": "7000", "tag": "", "driver": "sheepdog", "server.type": "inet", "vdi": "Alice"}' 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.
-----------------------------------------------------------------------

Test-2: Syntax: sheepdog://hostname:port/Alice
-----------------------------------------------------------------------
$ ./qemu-system-x86_64 -display none -nodefconfig -nodefaults sheepdog://192.168.122.84:7000/Alice
@@@ server.host=192.168.122.84
@@@ server.port=7000
@@@ tag=
@@@ server.type=inet
@@@ vdi=Alice
### vdi=Alice addr=192.168.122.84:7000 snap-id=(null) tag=
WARNING: Image format was not specified for 'json:{"server.host": "192.168.122.84", "server.port": "7000", "tag": "", "driver": "sheepdog", "server.type": "inet", "vdi": "Alice"}' 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.
-----------------------------------------------------------------------

Test-3: Syntax: -drive \
if=none,driver=sheepdog,server.type=inet,server.host=hostname,server.port=port,vdi=Alice
-----------------------------------------------------------------------
$ ./qemu-system-x86_64 -display none -nodefconfig -nodefaults -drive if=none,driver=sheepdog,server.type=inet,server.host=192.168.122.84,server.port=7000,vdi=Alice
@@@ server.host=192.168.122.84
@@@ server.port=7000
@@@ server.type=inet
@@@ vdi=Alice
### vdi=Alice addr=192.168.122.84:7000 snap-id=(null) tag=
-----------------------------------------------------------------------

Test-4: Syntax: -blockdev \
node-name=nn,driver=sheepdog,server.type=inet,server.host=host,server.port=port,vdi=Alice
-----------------------------------------------------------------------
$ ./qemu-system-x86_64 -display none -nodefconfig -nodefaults -blockdev node-name=nn,driver=sheepdog,server.type=inet,server.host=192.168.122.84,server.port=7000,vdi=Alice
@@@ server.port=7000
@@@ server.host=192.168.122.84
@@@ server.type=inet
@@@ vdi=Alice
### vdi=Alice addr=192.168.122.84:7000 snap-id=(null) tag=
-----------------------------------------------------------------------