From f3a5085903f770bf0b569d3b94ca1cc4d7bab53f Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Tue, 5 Oct 2010 19:20:27 +0000
Subject: [PATCH] package-ipkg.mk: build sysupgrade keepfile hints out of
 conffiles not yet present in the package. This applies to config directories
 or files that do not exist but may be created by the user after package
 installation.

SVN-Revision: 23257
---
 include/package-ipkg.mk | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index a07c5cc38c..512e40186d 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -49,6 +49,7 @@ ifeq ($(DUMP),)
     IPKG_$(1):=$(PACKAGE_DIR)/$(1)_$(VERSION)_$(PKGARCH).ipk
     IDIR_$(1):=$(PKG_BUILD_DIR)/ipkg-$(PKGARCH)/$(1)
     INFO_$(1):=$(IPKG_STATE_DIR)/info/$(1).list
+    KEEP_$(1):=$(strip $(call Package/$(1)/conffiles))
 
     ifeq ($(if $(VARIANT),$(BUILD_VARIANT)),$(VARIANT))
     ifdef Package/$(1)/install
@@ -112,6 +113,20 @@ ifeq ($(DUMP),)
 	(cd $$(IDIR_$(1))/CONTROL; \
 		$($(1)_COMMANDS) \
 	)
+
+    ifneq ($$(KEEP_$(1)),)
+		@( \
+			keepfiles=""; \
+			for x in $$(KEEP_$(1)); do \
+				[ -f "$$(IDIR_$(1))/$$$$x" ] || keepfiles="$$$${keepfiles:+$$$$keepfiles }$$$$x"; \
+			done; \
+			[ -z "$keepfiles" ] || { \
+				mkdir -p $$(IDIR_$(1))/lib/upgrade/keep.d; \
+				for x in $$$$keepfiles; do echo $$$$x >> $$(IDIR_$(1))/lib/upgrade/keep.d/$(1); done; \
+			}; \
+		)
+    endif
+
 	$(IPKG_BUILD) $$(IDIR_$(1)) $(PACKAGE_DIR)
 	@[ -f $$(IPKG_$(1)) ]