[RFC PATCH v2] plugins: Passed the parsed arguments directly to plugins

[Mahmoud Mandour]

Arguments were passed to plugins in the following form:
    -plugin path/to/plugin,arg="positional_arg=value",arg="second_arg"

This patch removes the need for "arg" so that the argument name itself
is now expected and passed directly to the plugin.

Now options can be passed in the following manner:
    -plugin path/to/plugin,positional_arg=value,second_arg

Since short boolean arguments are deprecated, passing an argument that
takes no value will trigger a warning saying that the user should use a
full "arg_name=on" instead of just "arg_name". In either case, the
argument is passed to the plugin as only the name, omitting the "=on"
part.

Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
---
 plugins/loader.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/plugins/loader.c b/plugins/loader.c
index 05df40398d..7f32b8c8bd 100644
--- a/plugins/loader.c
+++ b/plugins/loader.c
@@ -94,6 +94,7 @@ static int plugin_add(void *opaque, const char *name, const 
char *value,
 {
     struct qemu_plugin_parse_arg *arg = opaque;
     struct qemu_plugin_desc *p;
+    char *full_arg;
 
     if (strcmp(name, "file") == 0) {
         if (strcmp(value, "") == 0) {
@@ -107,7 +108,7 @@ static int plugin_add(void *opaque, const char *name, const 
char *value,
             QTAILQ_INSERT_TAIL(arg->head, p, entry);
         }
         arg->curr = p;
-    } else if (strcmp(name, "arg") == 0) {
+    } else {
         if (arg->curr == NULL) {
             error_setg(errp, "missing earlier '-plugin file=' option");
             return 1;
@@ -115,9 +116,12 @@ static int plugin_add(void *opaque, const char *name, 
const char *value,
         p = arg->curr;
         p->argc++;
         p->argv = g_realloc_n(p->argv, p->argc, sizeof(char *));
-        p->argv[p->argc - 1] = g_strdup(value);
-    } else {
-        error_setg(errp, "-plugin: unexpected parameter '%s'; ignored", name);
+        if (strcmp(value, "on")) {
+            full_arg = g_strdup_printf("%s=%s", name, value);
+        } else {
+            full_arg = g_strdup(name);
+        }
+        p->argv[p->argc - 1] = full_arg;
     }
     return 0;
 }
-- 
2.25.1