obex: Use user's cache dir as a default root

It's per-user, so we won't try to overwrite somebody else's files in /tmp when that happens. It's also (unless we have a particularly bizarre setup) on the same partition as the destination folder which means we can atomically move the file to the destination with a unique filename.

---
 obexd/src/main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

obexd/src/main.c +4 -5

index 61a06b2..2f7d723 100644
@@ -50,8 +50,6 @@
 #include "obexd.h"
 #include "server.h"
 
-#define DEFAULT_ROOT_PATH "/tmp"
-
 #define DEFAULT_CAP_FILE CONFIGDIR "/capability.xml"
 
 static GMainLoop *main_loop = NULL;

@@ -285,8 +283,10 @@ int main(int argc, char *argv[])
                exit(EXIT_FAILURE);
        }
 
-       if (option_root == NULL)
-               option_root = g_strdup(DEFAULT_ROOT_PATH);
+       if (option_root == NULL) {
+               option_root = g_build_filename(g_get_user_cache_dir(), "obexd", NULL);
+               g_mkdir_with_parents(option_root, 0700);
+       }
 
        if (option_root[0] != '/') {
                char *old_root = option_root, *home = getenv("HOME");
--

1.8.4.2