utils/tar: Make compression, acl, and xattr support configuration options

This patch make building tar with POSIX ACL and XATTR
support configuration options.  It also makes building
seamless (e.g. -z -J -j) compression support a configuration
option for each compression program available in OpenWrt.

It also makes POSIX ACL support disabled by default
(by default OpenWrt doesn't build POSIX ACL support
into the kernel, never mind allowing to mount with it
enabled).  Also XATTR support is disabled by
default as this seems to be the standard default for packages
in OpenWrt.

Finally Bzip2, Gzip, and XZ seamless support are made
available by default and appropriate dependencies
are added based on the configuration choice.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

utils/tar/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tar
 PKG_VERSION:=1.28
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
@@ -21,14 +21,42 @@ PKG_LICENSE_FILES:=COPYING
 
 PKG_INSTALL:=1
 
+BUILD_DEPENDS:=xz
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/tar
   SECTION:=utils
   CATEGORY:=Utilities
-  DEPENDS:=+bzip2 +libacl +libattr
+  DEPENDS:=+PACKAGE_TAR_POSIX_ACL:libacl +PACKAGE_TAR_XATTR:libattr +PACKAGE_TAR_BZIP2:bzip2
+  EXTRA_DEPENDS:=$(if $(CONFIG_PACKAGE_TAR_XZ),xz)
   TITLE:=GNU tar
   URL:=http://www.gnu.org/software/tar/
+  MENU:=1
+endef
+
+define Package/tar/config
+	config PACKAGE_TAR_POSIX_ACL
+	bool "tar: Enable POSIX ACL support" if PACKAGE_tar
+	default n
+
+	config PACKAGE_TAR_XATTR
+	bool "tar: Enable extended attribute (xattr) support" if PACKAGE_tar
+	default n
+
+	config PACKAGE_TAR_GZIP
+	bool "tar: Enable seamless gzip support" if PACKAGE_tar
+	default y
+
+	config PACKAGE_TAR_BZIP2
+	bool "tar: Enable seamless bzip2 support" if PACKAGE_tar
+	default y
+
+	config PACKAGE_TAR_XZ
+	bool "tar: Enable seamless xz support" if PACKAGE_tar
+	select PACKAGE_xz-utils
+	select PACKAGE_xz
+	default y
 endef
 
 define Package/tar/description
@@ -52,6 +80,18 @@ $${IPKG_INSTROOT}/bin/tar 2>&1 | grep 'applet not found' > /dev/null 2>&1 && rm
 exit 0
 endef
 
+CONFIGURE_ARGS += \
+	$(if $(CONFIG_PACKAGE_TAR_POSIX_ACL),--with,--without)-posix-acls \
+	$(if $(CONFIG_PACKAGE_TAR_XATTR),--with,--without)-xattrs \
+	$(if $(CONFIG_PACKAGE_TAR_GZIP),--with-gzip=gzip,--without-gzip) \
+	$(if $(CONFIG_PACKAGE_TAR_BZIP2),--with-bzip2=bzip2,--without-bzip2) \
+	$(if $(CONFIG_PACKAGE_TAR_XZ),--with-xz=xz,--without-xz) \
+	--without-compress \
+	--without-lzip \
+	--without-lzma \
+	--without-lzop \
+	--without-selinux
+
 MAKE_FLAGS += \
 	CFLAGS="$(TARGET_CFLAGS)" \
 	LDFLAGS="$(TARGET_LDLAGS)"