This patch adds a new configuration option (overlay_root) specifying 
what mount point opkg should check for available storage space.

Signed-off-by: Nicolas Thill <nico@openwrt.org>


diff -ruN opkg-4564-old/libopkg/opkg_conf.c opkg-4564-new/libopkg/opkg_conf.c
--- opkg-4564-old/libopkg/opkg_conf.c	2008-08-04 19:18:51.000000000 +0200
+++ opkg-4564-new/libopkg/opkg_conf.c	2008-12-12 02:26:35.000000000 +0100
@@ -64,6 +64,7 @@
 	  { "offline_root", OPKG_OPT_TYPE_STRING, &conf->offline_root },
 	  { "offline_root_post_script_cmd", OPKG_OPT_TYPE_STRING, &conf->offline_root_post_script_cmd },
 	  { "offline_root_pre_script_cmd", OPKG_OPT_TYPE_STRING, &conf->offline_root_pre_script_cmd },
+	  { "overlay_root", OPKG_OPT_TYPE_STRING, &conf->overlay_root },
 	  { "proxy_passwd", OPKG_OPT_TYPE_STRING, &conf->proxy_passwd },
 	  { "proxy_user", OPKG_OPT_TYPE_STRING, &conf->proxy_user },
 	  { "query-all", OPKG_OPT_TYPE_BOOL, &conf->query_all },
diff -ruN opkg-4564-old/libopkg/opkg_conf.h opkg-4564-new/libopkg/opkg_conf.h
--- opkg-4564-old/libopkg/opkg_conf.h	2008-08-04 19:18:51.000000000 +0200
+++ opkg-4564-new/libopkg/opkg_conf.h	2008-12-12 02:25:33.000000000 +0100
@@ -67,6 +67,7 @@
      char *offline_root;
      char *offline_root_pre_script_cmd;
      char *offline_root_post_script_cmd;
+     char *overlay_root;
      int query_all;
      int verbosity;
      int noaction;
Binary files opkg-4564-old/libopkg/opkg_conf.o and opkg-4564-new/libopkg/opkg_conf.o differ
diff -ruN opkg-4564-old/libopkg/opkg_install.c opkg-4564-new/libopkg/opkg_install.c
--- opkg-4564-old/libopkg/opkg_install.c	2008-08-04 19:18:51.000000000 +0200
+++ opkg-4564-new/libopkg/opkg_install.c	2008-12-12 02:29:13.000000000 +0100
@@ -525,9 +525,15 @@
      * 3) return a proper error code instead of 1
      */
      int comp_size, blocks_available;
+     char *root;
     
      if (!conf->force_space && pkg->installed_size != NULL) {
-	  blocks_available = get_available_blocks(conf->default_dest->root_dir);
+          if (conf->overlay_root != NULL) {
+               root = conf->overlay_root;
+          } else {
+               root = conf->default_dest->root_dir;
+          }
+	  blocks_available = get_available_blocks(root);
 
 	  comp_size = strtoul(pkg->installed_size, NULL, 0);
 	  /* round up a blocks count without doing fancy-but-slow casting jazz */