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virsh: add qemu-monitor-command --pretty

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I was using qemu-monitor-command during development, and found it quite
hard to use.  Compare the results of this patch on ease of reading:

$ virsh qemu-monitor-command          dom '{"execute":"query-version"}'
{"return":{"qemu":{"micro":1,"minor":12,"major":0},"package":"(qemu-kvm-0.12.1.2)"},"id":"libvirt-7683"}

$ virsh qemu-monitor-command --pretty dom '{"execute":"query-version"}'
{
    "return": {
        "qemu": {
            "micro": 1,
            "minor": 12,
            "major": 0
        },
        "package": "(qemu-kvm-0.12.1.2)"
    },
    "id": "libvirt-7674"
}

* tools/virsh-host.c (cmdQemuMonitorCommand): New option.
* tools/virsh.pod (qemu-monitor-command): Document it.
This commit is contained in:
Eric Blake 2012-10-04 17:14:19 -06:00
parent 7c035625f8
commit 2a1aaa609e
2 changed files with 27 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
tools/virsh-host.c
View File

@ -38,6 +38,7 @@
#include "virsh-domain.h"
#include "xml.h"
#include "virtypedparam.h"
#include "json.h"
/*
* "capabilities" command
@ -529,6 +530,8 @@ static const vshCmdInfo info_qemu_monitor_command[] = {
static const vshCmdOptDef opts_qemu_monitor_command[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"hmp", VSH_OT_BOOL, 0, N_("command is in human monitor protocol")},
{"pretty", VSH_OT_BOOL, 0,
N_("pretty-print any qemu monitor protocol output")},
{"cmd", VSH_OT_ARGV, VSH_OFLAG_REQ, N_("command")},
{NULL, 0, 0, NULL}
};
@ -544,6 +547,7 @@ cmdQemuMonitorCommand(vshControl *ctl, const vshCmd *cmd)
const vshCmdOpt *opt = NULL;
virBuffer buf = VIR_BUFFER_INITIALIZER;
bool pad = false;
virJSONValuePtr pretty = NULL;
dom = vshCommandOptDomain(ctl, cmd, NULL);
if (dom == NULL)
@ -561,12 +565,27 @@ cmdQemuMonitorCommand(vshControl *ctl, const vshCmd *cmd)
}
monitor_cmd = virBufferContentAndReset(&buf);
if (vshCommandOptBool(cmd, "hmp"))
if (vshCommandOptBool(cmd, "hmp")) {
if (vshCommandOptBool(cmd, "pretty")) {
vshError(ctl, _("--hmp and --pretty are not compatible"));
goto cleanup;
}
flags |= VIR_DOMAIN_QEMU_MONITOR_COMMAND_HMP;
}
if (virDomainQemuMonitorCommand(dom, monitor_cmd, &result, flags) < 0)
goto cleanup;
if (vshCommandOptBool(cmd, "pretty")) {
char *tmp;
pretty = virJSONValueFromString(result);
if (pretty && (tmp = virJSONValueToString(pretty, true))) {
VIR_FREE(result);
result = tmp;
} else {
vshResetLibvirtError();
}
}
vshPrint(ctl, "%s\n", result);
ret = true;
@ -574,6 +593,7 @@ cmdQemuMonitorCommand(vshControl *ctl, const vshCmd *cmd)
cleanup:
VIR_FREE(result);
VIR_FREE(monitor_cmd);
virJSONValueFree(pretty);
if (dom)
virDomainFree(dom);

10
tools/virsh.pod
View File

@ -2910,15 +2910,17 @@ attaching to an externally launched QEMU process. There may be
issues with the guest ABI changing upon migration, and hotunplug
may not work.
=item B<qemu-monitor-command> I<domain> [I<--hmp>] I<command>...
=item B<qemu-monitor-command> I<domain> { [I<--hmp>] | [I<--pretty>] }
I<command>...
Send an arbitrary monitor command I<command> to domain I<domain> through the
qemu monitor. The results of the command will be printed on stdout. If
I<--hmp> is passed, the command is considered to be a human monitor command
and libvirt will automatically convert it into QMP if needed. In that case
the result will also be converted back from QMP. If more than one argument
is provided for I<command>, they are concatenated with a space in between
before passing the single command to the monitor.
the result will also be converted back from QMP. If I<--pretty> is given,
and the monitor uses QMP, then the output will be pretty-printed. If more
than one argument is provided for I<command>, they are concatenated with a
space in between before passing the single command to the monitor.
=back