Re: [PATCH 0/5] qmp-shell modifications for non-interactive use

[Markus Armbruster]

Damien Hedde <damien.hedde@greensocs.com> writes:

> On 2/22/22 07:10, Markus Armbruster wrote:
>> Damien Hedde <damien.hedde@greensocs.com> writes:
>> 
>>> Hi,
>>>
>>> The main idea of this series is to be a bit more user-friendly when
>>> using qmp-shell in a non-interactive way: with an input redirection
>>> from a file containing a list of commands.
>>>
>>> I'm working on dynamic qapi config of a qemu machine, this would
>>> be very useful to provide and reproduce small examples.
>> Why not use plain QMP for that?
>> [...]
>> 
> What do you mean by plain QMP ?

Talk straight to QEMU without a translator:

    $ cat script
    {"execute": "qmp_capabilities"}
    {"execute": "quit"}
    $ socat -t 3 STDIO UNIX-CONNECT:$HOME/work/images/test-qmp <script
    {"QMP": {"version": {"qemu": {"micro": 50, "minor": 2, "major": 6}, 
"package": "v6.2.0-1603-gc13b8e9973"}, "capabilities": ["oob"]}}
    {"error": {"class": "CommandNotFound", "desc": "Expecting capabilities 
negotiation with 'qmp_capabilities'"}}
    armbru@dusky:~/work/qemu$ echo -e 
'{"execute":"qmp_capabilities"}{"execute":"quit"}' >script
    armbru@dusky:~/work/qemu$ echo -e 
'{"execute":"qmp_capabilities"}\n{"execute":"quit"}' >script
    armbru@dusky:~/work/qemu$ socat -t 3 STDIO 
UNIX-CONNECT:$HOME/work/images/test-qmp <script
    {"QMP": {"version": {"qemu": {"micro": 50, "minor": 2, "major": 6}, 
"package": "v6.2.0-1603-gc13b8e9973"}, "capabilities": ["oob"]}}
    {"return": {}}
    {"return": {}}
    {"timestamp": {"seconds": 1645523438, "microseconds": 951702}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}

socat also supports interactive use nicely.  Try

    $ socat "READLINE,history=$HOME/.qmp_history,prompt=QMP>" 
UNIX-CONNECT:$HOME/path/to/socket

Helpfully blinks matching parenthesis for me.