opkg: indicate upgrade vs install

when running the postinst trigger we set PKG_UPGRADE=1 if this is an upgrade
and not an install.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 42468

package/system/opkg/patches/110-upgrade.patch

+Index: opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/opkg_install.c
+===================================================================
+--- opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d.orig/libopkg/opkg_install.c	2014-09-07 22:06:37.875956909 +0200
++++ opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/opkg_install.c	2014-09-07 22:10:30.579952951 +0200
+@@ -1463,10 +1463,11 @@
+                /* removing files from old package, to avoid ghost files */
+                remove_data_files_and_list(old_pkg);
+                remove_maintainer_scripts(old_pkg);
++	       pkg->is_upgrade = 1;
+ 	  }
+ 
+ 
+-	  opkg_msg(INFO, "Installing maintainer scripts.\n");
++	  opkg_msg(INFO, "%s maintainer scripts.\n", (pkg->is_upgrade) ? ("Upgrading") : ("Installing"));
+ 	  if (install_maintainer_scripts(pkg, old_pkg)) {
+ 		opkg_msg(ERROR, "Failed to extract maintainer scripts for %s."
+ 			       " Package debris may remain!\n",
+Index: opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/pkg.c
+===================================================================
+--- opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d.orig/libopkg/pkg.c	2014-09-07 22:06:37.863956909 +0200
++++ opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/pkg.c	2014-09-07 22:09:09.387954332 +0200
+@@ -1285,6 +1285,12 @@
+      setenv("PKG_ROOT",
+ 	    pkg->dest ? pkg->dest->root_dir : conf->default_dest->root_dir, 1);
+ 
++	if (pkg->is_upgrade)
++		setenv("PKG_UPGRADE", "1", 0);
++	else
++		setenv("PKG_UPGRADE", "0", 0);
++
++
+      if (! file_exists(path)) {
+ 	  free(path);
+ 	  return 0;
+Index: opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/pkg.h
+===================================================================
+--- opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d.orig/libopkg/pkg.h	2014-03-21 16:56:11.000000000 +0100
++++ opkg-9c97d5ecd795709c8584e972bfdf3aee3a5b846d/libopkg/pkg.h	2014-09-07 22:09:26.315954044 +0200
+@@ -184,6 +184,7 @@
+      /* this flag specifies whether the package was installed to satisfy another
+       * package's dependancies */
+      int auto_installed;
++     int is_upgrade;
+ };
+ 
+ pkg_t *pkg_new(void);