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virsh: Allow extracting 'return' section of QMP command in 'qemu-monitor-command'

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Simplify gathering the actual return value from a passed-through QMP
command when using 'qemu-monitor-command' by adding '--return-value'
switch which just extracts the 'return' section and alternatively
reports an error if the section is not present.

This simplifies gathering of some test data where the full reply would
need to be trimmed just for the actual return value.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Peter Krempa 2019-12-11 14:16:22 +01:00
parent 9860d00004
commit 41345f6201
2 changed files with 39 additions and 10 deletions
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5
docs/manpages/virsh.rst
View File

@ -7482,7 +7482,7 @@ qemu-monitor-command
.. code-block::
qemu-monitor-command domain { [--hmp] | [--pretty] } command...
qemu-monitor-command domain { [--hmp] | [--pretty] [--return-value] } command...
Send an arbitrary monitor command *command* to domain *domain* through the
QEMU monitor. The results of the command will be printed on stdout.
@ -7495,6 +7495,9 @@ in QMP format to work properly.
If *--pretty* is given the QMP reply is pretty-printed.
If *--return-value* is given the 'return' key of the QMP response object is
extracted rather than passing through the full reply from QEMU.
If *--hmp* is passed, the command is considered to be a human monitor command
and libvirt will automatically convert it into QMP and convert the result back.

44
tools/virsh-domain.c
View File

@ -9617,6 +9617,10 @@ static const vshCmdOptDef opts_qemu_monitor_command[] = {
.type = VSH_OT_BOOL,
.help = N_("pretty-print any qemu monitor protocol output")
},
{.name = "return-value",
.type = VSH_OT_BOOL,
.help = N_("extract the value of the 'return' key from the returned string")
},
{.name = "cmd",
.type = VSH_OT_ARGV,
.flags = VSH_OFLAG_REQ,
@ -9631,11 +9635,17 @@ cmdQemuMonitorCommand(vshControl *ctl, const vshCmd *cmd)
g_autoptr(virshDomain) dom = NULL;
g_autofree char *monitor_cmd = NULL;
g_autofree char *result = NULL;
g_autoptr(virJSONValue) resultjson = NULL;
unsigned int flags = 0;
const vshCmdOpt *opt = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
bool pretty = vshCommandOptBool(cmd, "pretty");
bool returnval = vshCommandOptBool(cmd, "return-value");
virJSONValuePtr formatjson;
g_autofree char *jsonstr = NULL;
VSH_EXCLUSIVE_OPTIONS("hmp", "pretty");
VSH_EXCLUSIVE_OPTIONS("hmp", "return-value");
if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
return false;
@ -9653,17 +9663,33 @@ cmdQemuMonitorCommand(vshControl *ctl, const vshCmd *cmd)
if (virDomainQemuMonitorCommand(dom, monitor_cmd, &result, flags) < 0)
return false;
if (vshCommandOptBool(cmd, "pretty")) {
char *tmp;
if ((tmp = virJSONStringReformat(result, true))) {
VIR_FREE(result);
result = tmp;
virTrimSpaces(result, NULL);
} else {
vshResetLibvirtError();
if (returnval || pretty) {
resultjson = virJSONValueFromString(result);
if (returnval && !resultjson) {
vshError(ctl, "failed to parse JSON returned by qemu");
return false;
}
}
vshPrint(ctl, "%s\n", result);
/* print raw non-prettified result */
if (!resultjson) {
vshPrint(ctl, "%s\n", result);
return true;
}
if (returnval) {
if (!(formatjson = virJSONValueObjectGet(resultjson, "return"))) {
vshError(ctl, "'return' member missing");
return false;
}
} else {
formatjson = resultjson;
}
jsonstr = virJSONValueToString(formatjson, pretty);
virTrimSpaces(jsonstr, NULL);
vshPrint(ctl, "%s", jsonstr);
return true;
}