[Qemu-devel] [PATCH 2/9] Monitor: handle optional '-' arg as a bool

[Luiz Capitulino <lcapitulino@redhat.com>]

Historically, user monitor arguments beginning with '-' (eg. '-f')
were passed as integers down to handlers.

I've maintained this behavior in the new monitor because we didn't
have a boolean type at the very beginning of QMP. Today we have it
and this behavior is causing trouble to the code that checks QMP
client's arguments.

This commit fixes the problem by doing the following changes:

1. User Monitor

   Before: the optional arg was represented as a QInt, we'd pass 1
           down to handlers if the user specified the argument or
           0 otherwise

   This commit: the optional arg is represented as a QBool, we pass
                true down to handlers if the user specified the
                argument, otherwise _nothing_ is passed

2. QMP

   Before: the client was required to pass the arg as QBool, but we'd
           convert it to QInt internally. If the argument wasn't passed,
           we'd pass 0 down

   This commit: keep requiring a QBool, but doesn't do any conversion
                and doesn't pass any default value

3. Convert existing handlers (do_eject()/do_migrate()) to the new way

   Before: Both handlers would expect QInt value, either 0 or 1

   This commit: Change the handlers to accept a QBool, they handle the
                following cases:

                   A) true is passed: the option is enabled
                   B) false is passed: the option is disabled
                   C) nothing is passed: option not specified, use
                                         default behavior

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 migration.c |   16 +++++++---------
 monitor.c   |   19 ++++---------------
 2 files changed, 11 insertions(+), 24 deletions(-)

diff --git a/migration.c b/migration.c
index 706fe55..efecbdc 100644
--- a/migration.c
+++ b/migration.c
@@ -58,7 +58,9 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     MigrationState *s = NULL;
     const char *p;
-    int detach = qdict_get_int(qdict, "detach");
+    int detach = qdict_get_try_bool(qdict, "detach", 0);
+    int blk = qdict_get_try_bool(qdict, "blk", 0);
+    int inc = qdict_get_try_bool(qdict, "inc", 0);
     const char *uri = qdict_get_str(qdict, "uri");
 
     if (current_migration &&
@@ -69,21 +71,17 @@ int do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
 
     if (strstart(uri, "tcp:", &p)) {
         s = tcp_start_outgoing_migration(mon, p, max_throttle, detach,
-                                         (int)qdict_get_int(qdict, "blk"), 
-                                         (int)qdict_get_int(qdict, "inc"));
+                                         blk, inc);
 #if !defined(WIN32)
     } else if (strstart(uri, "exec:", &p)) {
         s = exec_start_outgoing_migration(mon, p, max_throttle, detach,
-                                          (int)qdict_get_int(qdict, "blk"), 
-                                          (int)qdict_get_int(qdict, "inc"));
+                                          blk, inc);
     } else if (strstart(uri, "unix:", &p)) {
         s = unix_start_outgoing_migration(mon, p, max_throttle, detach,
-					  (int)qdict_get_int(qdict, "blk"), 
-                                          (int)qdict_get_int(qdict, "inc"));
+                                          blk, inc);
     } else if (strstart(uri, "fd:", &p)) {
         s = fd_start_outgoing_migration(mon, p, max_throttle, detach, 
-                                        (int)qdict_get_int(qdict, "blk"), 
-                                        (int)qdict_get_int(qdict, "inc"));
+                                        blk, inc);
 #endif
     } else {
         monitor_printf(mon, "unknown migration protocol: %s\n", uri);
diff --git a/monitor.c b/monitor.c
index 15b53b9..bc3cc18 100644
--- a/monitor.c
+++ b/monitor.c
@@ -971,7 +971,7 @@ static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
 static int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     BlockDriverState *bs;
-    int force = qdict_get_int(qdict, "force");
+    int force = qdict_get_try_bool(qdict, "force", 0);
     const char *filename = qdict_get_str(qdict, "device");
 
     bs = bdrv_find(filename);
@@ -3684,7 +3684,7 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
         case '-':
             {
                 const char *tmp = p;
-                int has_option, skip_key = 0;
+                int skip_key = 0;
                 /* option */
 
                 c = *typestr++;
@@ -3692,7 +3692,6 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                     goto bad_type;
                 while (qemu_isspace(*p))
                     p++;
-                has_option = 0;
                 if (*p == '-') {
                     p++;
                     if(c != *p) {
@@ -3708,11 +3707,11 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                     if(skip_key) {
                         p = tmp;
                     } else {
+                        /* has option */
                         p++;
-                        has_option = 1;
+                        qdict_put(qdict, key, qbool_from_int(1));
                     }
                 }
-                qdict_put(qdict, key, qint_from_int(has_option));
             }
             break;
         default:
@@ -4097,11 +4096,6 @@ static int check_opt(const CmdArgs *cmd_args, const char *name, QDict *args)
         return -1;
     }
 
-    if (cmd_args->type == '-') {
-        /* handlers expect a value, they need to be changed */
-        qdict_put(args, name, qint_from_int(0));
-    }
-
     return 0;
 }
 
@@ -4174,11 +4168,6 @@ static int check_arg(const CmdArgs *cmd_args, QDict *args)
                 qerror_report(QERR_INVALID_PARAMETER_TYPE, name, "bool");
                 return -1;
             }
-            if (qobject_type(value) == QTYPE_QBOOL) {
-                /* handlers expect a QInt, they need to be changed */
-                qdict_put(args, name,
-                         qint_from_int(qbool_get_int(qobject_to_qbool(value))));
-            }
             break;
         case 'O':
         default:
-- 
1.7.1.231.gd0b16