1 files changed, 47 insertions, 10 deletions
diff --git a/include/unpack.mk b/include/unpack.mk
index 7813e3b3d..10e6c25bf 100644
--- a/include/unpack.mk
+++ b/include/unpack.mk
@@ -1,21 +1,58 @@
+ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))
+
+# unpacking files with +s may break on some platforms. this typically emits error code 2
+ifneq ($(HOST_OS),Linux)
+  HOST_TAR:=trapret 2 $(TAR)
+else
+  HOST_TAR:=$(TAR)
+endif
+TAR_CMD:=$(HOST_TAR) -C $(PKG_BUILD_DIR)/.. $(TAR_OPTIONS)
+UNZIP_CMD:=unzip -d $(PKG_BUILD_DIR)/.. $(DL_DIR)/$(PKG_SOURCE)
+
+ifeq ($(PKG_SOURCE),)
+  PKG_UNPACK ?= true
+endif
 ifeq ($(strip $(PKG_UNPACK)),)
-  ifneq ($(HOST_OS),Linux)
-	HOST_TAR:=trapret 2 $(TAR)
-  else
-    HOST_TAR:=$(TAR)
+  ifeq ($(strip $(PKG_CAT)),)
+    # try to autodetect file type
+    EXT:=$(call ext,$(PKG_SOURCE))
+    EXT1:=$(EXT)
+
+    ifeq ($(filter gz tgz,$(EXT)),$(EXT))
+      EXT:=$(call ext,$(PKG_SOURCE:.$(EXT)=))
+      UNPACK:=$(ZCAT) $(DL_DIR)/$(PKG_SOURCE) |
+    endif	
+    ifeq ($(filter bzip2 bz2 bz tbz2 tbz,$(EXT)),$(EXT))
+      EXT:=$(call ext,$(PKG_SOURCE:.$(EXT)=))
+      UNPACK:=bzcat $(DL_DIR)/$(PKG_SOURCE) |
+    endif
+    ifeq ($(filter tgz tbz tbz2,$(EXT1)),$(EXT1))
+      $(error FOO: $(filter tgz tbz tbz2,$(EXT1)),$(EXT1))
+      EXT:=tar
+    endif
+    UNPACK ?= cat $(DL_DIR)/$(PKG_SOURCE) |
+    ifeq ($(EXT),tar)
+      PKG_UNPACK:=$(UNPACK) $(TAR_CMD)
+    endif
+    ifeq ($(EXT),cpio)
+      PKG_UNPACK:=$(UNPACK) (cd $(PKG_BUILD_DIR)/..; cpio -i -d)
+    endif
+    ifeq ($(EXT),zip)
+      PKG_UNPACK:=$(UNZIP_CMD)
+    endif
   endif
-  ifneq ($(strip $(PKG_CAT)),)
+ 
+  # compatibility code for packages that set PKG_CAT
+  ifeq ($(strip $(PKG_CAT)$(PKG_UNPACK)),)
     # use existing PKG_CAT
-    PKG_UNPACK:=$(PKG_CAT) $(DL_DIR)/$(PKG_SOURCE) | $(HOST_TAR) -C $(PKG_BUILD_DIR)/.. $(TAR_OPTIONS)
+    PKG_UNPACK:=$(PKG_CAT) $(DL_DIR)/$(PKG_SOURCE) | $(TAR_CMD)
     ifeq ($(PKG_CAT),unzip)
-      PKG_UNPACK:=unzip -d $(PKG_BUILD_DIR)/.. $(DL_DIR)/$(PKG_SOURCE)
+      PKG_UNPACK:=$(UNZIP_CMD)
     endif
     # replace zcat with $(ZCAT), because some system have it as gzcat
     ifeq ($(PKG_CAT),zcat)
-      PKG_UNPACK:=$(ZCAT) $(DL_DIR)/$(PKG_SOURCE) | $(HOST_TAR) -C $(PKG_BUILD_DIR)/.. $(TAR_OPTIONS)
+      PKG_UNPACK:=$(ZCAT) $(DL_DIR)/$(PKG_SOURCE) | $(TAR_CMD)
     endif
-  else
-    # try to autodetect file type
   endif
   ifneq ($(strip $(CRLF_WORKAROUND)),)
     PKG_UNPACK += && find $(PKG_BUILD_DIR) -type f -print0 | xargs -0 perl -pi -e 's!\r$$$$!!g'