system-linux: add support for hotplug event 'move'

If you rename a network interface, there is a move uevent
invoked instead of remove/add.

This patch adds support for this kind of event.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Acked-by: Hans Dedecker <dedeckeh@gmail.com>

diff --git a/system-linux.c b/system-linux.c
index 6d97a02..32d6ffc 100644 (file)
--- a/system-linux.c
+++ b/system-linux.c
@@ -543,16 +543,20 @@ out:
 static void
 handle_hotplug_msg(char *data, int size)
 {
-       const char *subsystem = NULL, *interface = NULL;
+       const char *subsystem = NULL, *interface = NULL, *interface_old = NULL;
        char *cur, *end, *sep;
        struct device *dev;
        int skip;
-       bool add;
+       bool add, move = false;
 
        if (!strncmp(data, "add@", 4))
                add = true;
        else if (!strncmp(data, "remove@", 7))
                add = false;
+       else if (!strncmp(data, "move@", 5)) {
+               add = true;
+               move = true;
+       }
        else
                return;
 
@@ -573,12 +577,32 @@ handle_hotplug_msg(char *data, int size)
                        subsystem = sep + 1;
                        if (strcmp(subsystem, "net") != 0)
                                return;
+               } else if (!strcmp(cur, "DEVPATH_OLD")) {
+                       interface_old = strrchr(sep + 1, '/');
+                       if (interface_old)
+                               interface_old++;
                }
-               if (subsystem && interface)
+       }
+
+       if (subsystem && interface) {
+               if (move && interface_old)
+                       goto move;
+               else
                        goto found;
        }
+
        return;
 
+move:
+       dev = device_find(interface_old);
+       if (!dev)
+               goto found;
+
+       if (dev->type != &simple_device_type)
+               goto found;
+
+       device_set_present(dev, false);
+
 found:
        dev = device_find(interface);
        if (!dev)