Hi guys,
I was just implementing support for guest-sync-delimited into libvirt. My
intent is to issue this command prior any other command to determine if GA is
available or not. The big advantage is - it doesn't change the state of the
guest so from libvirt POV it's harmless. The other big advantage is this
sentinel byte 0xFF which is supposed to flush all unprocessed (and possibly
stale) data from previous unsuccessful tries.
As written in documentation, this command will output sentinel byte to the
guest agent socket. This works perfectly. However, it is advised in the very
same documentation to prepend this command with the sentinel as well allowing
GA parser flush. But this doesn't work for me completely. All I can get is:
$ echo -e "\xFF{\"execute\":\"guest-sync-delimited\",
\"arguments\":{\"id\":1234}}" | nc -U /tmp/ga.sock | hexdump -C
nc: using stream socket
00000000 7b 22 65 72 72 6f 72 22 3a 20 7b 22 63 6c 61 73 |{"error": {"clas|
00000010 73 22 3a 20 22 4a 53 4f 4e 50 61 72 73 69 6e 67 |s": "JSONParsing|
00000020 22 2c 20 22 64 61 74 61 22 3a 20 7b 7d 7d 7d 0a |", "data": {}}}.|
00000030 ff 7b 22 72 65 74 75 72 6e 22 3a 20 31 32 33 34 |.{"return": 1234|
00000040 7d 0a |}.|
00000042
The problem is - GA has difficulties with parsing sentinel, although the reply
is correct, indeed.
Therefore my question is - should I just drop passing sentinel to GA? And even
if this is fixed, How should I deal with older releases which have this bug?
Regards,
Michal
