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Monitor: handle optional '-' arg as a bool 

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 QMP's argument checker.

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: still require 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 a 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>
This commit is contained in:
Luiz Capitulino 2010-05-28 15:25:24 -03:00
parent 35006ac856
commit eb159d13ee
3 changed files with 11 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
blockdev.c
View File

@ -521,7 +521,7 @@ static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
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);

16
migration.c
View File

@ -75,7 +75,9 @@ 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 &&
@ -86,21 +88,17 @@ 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);

17
monitor.c
View File

@ -3565,7 +3565,7 @@ 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++;
@ -3573,7 +3573,6 @@ 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) {
@ -3589,11 +3588,11 @@ 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:
@ -3985,11 +3984,6 @@ 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;
}
@ -4062,11 +4056,6 @@ 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: