gluster: Fix blockdev-add with server.N.type=unix

The legacy command line interface gets the socket path from an option
called 'socket'. QAPI in contract uses SocketAddress, where the
corresponding option is called 'path'.

Fix the gluster block driver to accept both 'socket' and 'path', with
'path' being the preferred syntax.

https://bugzilla.redhat.com/show_bug.cgi?id=1545155

Cc: qemu-stable@nongnu.org
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

block/gluster.c

@@ -167,7 +167,12 @@ static QemuOptsList runtime_unix_opts = {
         {
             .name = GLUSTER_OPT_SOCKET,
             .type = QEMU_OPT_STRING,
-            .help = "socket file path)",
+            .help = "socket file path (legacy)",
+        },
+        {
+            .name = GLUSTER_OPT_PATH,
+            .type = QEMU_OPT_STRING,
+            .help = "socket file path (QAPI)",
         },
         { /* end of list */ }
     },
@@ -615,10 +620,18 @@ static int qemu_gluster_parse_json(BlockdevOptionsGluster *gconf,
                 goto out;
             }
 
-            ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
+            ptr = qemu_opt_get(opts, GLUSTER_OPT_PATH);
+            if (!ptr) {
+                ptr = qemu_opt_get(opts, GLUSTER_OPT_SOCKET);
+            } else if (qemu_opt_get(opts, GLUSTER_OPT_SOCKET)) {
+                error_setg(&local_err,
+                           "Conflicting parameters 'path' and 'socket'");
+                error_append_hint(&local_err, GERR_INDEX_HINT, i);
+                goto out;
+            }
             if (!ptr) {
                 error_setg(&local_err, QERR_MISSING_PARAMETER,
-                           GLUSTER_OPT_SOCKET);
+                           GLUSTER_OPT_PATH);
                 error_append_hint(&local_err, GERR_INDEX_HINT, i);
                 goto out;
             }
@@ -684,7 +697,7 @@ static int qemu_gluster_parse(BlockdevOptionsGluster *gconf,
                              "file.server.0.host=1.2.3.4,"
                              "file.server.0.port=24007,"
                              "file.server.1.transport=unix,"
-                             "file.server.1.socket=/var/run/glusterd.socket ..."
+                             "file.server.1.path=/var/run/glusterd.socket ..."
                              "\n");
             return ret;
         }