From 0f54da55b8717543b08596e58c022ae49e70a184 Mon Sep 17 00:00:00 2001
From: graham.gower@gmail.com <graham.gower@gmail.com@e8e0d7a0-c8d9-11dd-a880-a1081c7ac358>
Date: Sun, 13 Feb 2011 21:46:01 -0500
Subject: Add overlay_root config option. Opkg checks this location for available space.

This option is useful in the case where root is mounted ro, and another rw
filesystem is overlaid on top with e.g. mini_fo.

From Nicolas Thill via OpenWrt.

git-svn-id: http://opkg.googlecode.com/svn/trunk@601 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358
---
diff --git a/libopkg/opkg_conf.c b/libopkg/opkg_conf.c
index acac1b4..864d2ac 100644
--- a/libopkg/opkg_conf.c
+++ b/libopkg/opkg_conf.c
@@ -63,6 +63,7 @@ opkg_option_t options[] = {
 	  { "download_only", OPKG_OPT_TYPE_BOOL, &_conf.download_only },
 	  { "nodeps", OPKG_OPT_TYPE_BOOL, &_conf.nodeps },
 	  { "offline_root", OPKG_OPT_TYPE_STRING, &_conf.offline_root },
+	  { "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 --git a/libopkg/opkg_conf.h b/libopkg/opkg_conf.h
index af6b9ab..0340ff2 100644
--- a/libopkg/opkg_conf.h
+++ b/libopkg/opkg_conf.h
@@ -79,6 +79,7 @@ struct opkg_conf
      int check_signature;
      int nodeps; /* do not follow dependencies */
      char *offline_root;
+     char *overlay_root;
      int query_all;
      int verbosity;
      int noaction;
diff --git a/libopkg/opkg_install.c b/libopkg/opkg_install.c
index 7838875..74a2ce1 100644
--- a/libopkg/opkg_install.c
+++ b/libopkg/opkg_install.c
@@ -21,6 +21,7 @@
 #include <time.h>
 #include <signal.h>
 #include <unistd.h>
+#include <sys/stat.h>
 
 #include "pkg.h"
 #include "pkg_hash.h"
@@ -192,13 +193,24 @@ static int
 verify_pkg_installable(pkg_t *pkg)
 {
 	unsigned long kbs_available, pkg_size_kbs;
-	char *root_dir;
+	char *root_dir = NULL;
+	struct stat s;
 
 	if (conf->force_space || pkg->installed_size == 0)
 		return 0;
 
-	root_dir = pkg->dest ? pkg->dest->root_dir :
-						conf->default_dest->root_dir;
+	if (pkg->dest)
+	{
+		if (!strcmp(pkg->dest->name, "root") && conf->overlay_root
+		    && !stat(conf->overlay_root, &s) && (s.st_mode & S_IFDIR))
+			root_dir = conf->overlay_root;
+		else
+			root_dir = pkg->dest->root_dir;
+	}
+
+	if (!root_dir)
+		root_dir = conf->default_dest->root_dir;
+
 	kbs_available = get_available_kbytes(root_dir);
 
 	pkg_size_kbs = (pkg->installed_size + 1023)/1024;
--
cgit v0.9.1