[Qemu-devel] [PATCH v3] QMP: Allow dot separated dict path arguments in qmp-shell

[Fam Zheng <famz@redhat.com>]

As another convinience to allow using commands that expect a dict as
argument, this patch adds support for foo.bar=value syntax, similar to
command line argument style:

  (QEMU) blockdev-add options.driver=file options.id=drive1 options.filename=...

Signed-off-by: Fam Zheng <famz@redhat.com>

---
v3: Fix error message wording. (Eric)
v2: Fix variable usage and improved error check and report.

Applies on top of Stefan's patch

    [PATCH] QMP: allow JSON dict arguments in qmp-shell

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 scripts/qmp/qmp-shell | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
index d374b35..e0e848b 100755
--- a/scripts/qmp/qmp-shell
+++ b/scripts/qmp/qmp-shell
@@ -112,13 +112,29 @@ class QMPShell(qmp.QEMUMonitorProtocol):
                     value = json.loads(opt[1])
                 else:
                     value = opt[1]
-            qmpcmd['arguments'][opt[0]] = value
+            optpath = opt[0].split('.')
+            parent = qmpcmd['arguments']
+            curpath = []
+            for p in optpath[:-1]:
+                curpath.append(p)
+                d = parent.get(p, {})
+                if type(d) is not dict:
+                    raise QMPShellError('Cannot use "%s" as both leaf and non-leaf key' % '.'.join(curpath))
+                parent[p] = d
+                parent = d
+            if optpath[-1] in parent:
+                if type(parent[optpath[-1]]) is dict:
+                    raise QMPShellError('Cannot use "%s" as both leaf and non-leaf key' % '.'.join(curpath))
+                else:
+                    raise QMPShellError('Cannot set "%s" multiple times' % opt[0])
+            parent[optpath[-1]] = value
         return qmpcmd
 
     def _execute_cmd(self, cmdline):
         try:
             qmpcmd = self.__build_cmd(cmdline)
-        except:
+        except Exception, e:
+            print 'Error while parsing command line: %s' % e
             print 'command format: <command-name> ',
             print '[arg-name1=arg1] ... [arg-nameN=argN]'
             return True
-- 
1.8.5.4