Config: Create common functions to create archives

The compression code is very messy because it has changed so many times.
This cleans this up and creates common functions that can be used for
the ISO images as well as packages.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

lfs/Config

@@ -67,7 +67,9 @@ endif
 TAR_OPTIONS = \
 	--format=pax \
 	--acls \
-	--xattrs --xattrs-include='*'
+	--xattrs \
+	--xattrs-include='*' \
+	--sparse
 
 ZSTD_OPTIONS = \
 	-T$(PARALLELISM) \
@@ -330,6 +332,56 @@ define B2SUM
 	[ "$($@_BLAKE2)" = "$$(b2sum $(DIR_DL)/$@ | awk '{ print $$1 }')" ] && echo "$@ checksum OK"
 endef
 
+# Takes one rootfile or a directory and will return a list of all included files
+define COLLECT_FILES
+	BUILDTARGET="$(BUILDTARGET)" \
+	BUILD_ARCH="$(BUILD_ARCH)" \
+	KVER="$(KVER)" \
+		$(DIR_SRC)/src/scripts/archive.files $(1)
+endef
+
+# Takes a filelist from standard input and streams a tarball with all files
+__FILES_IN = \
+	tar \
+		--create \
+		$(TAR_OPTIONS) \
+		--directory=/ \
+		--exclude="dev/pts/*" \
+		--exclude="proc/*" \
+		--exclude="tmp/*" \
+		--exclude="__pycache__" \
+		--files-from=-
+
+# Takes a tarball and extracts it in the target directory
+__FILES_OUT = \
+	tar \
+		--extract \
+		$(TAR_OPTIONS) \
+		--directory="$(1)"
+
+# Copies all files on a rootfile into the given directory
+define COPY_FILES
+	# Copy all files from $(1) to $(2)
+	$(call COLLECT_FILES,$(1)) | $(call __FILES_IN) | $(call __FILES_OUT,$(2))
+
+	# Strip everything
+	$(DIR_SRC)/src/stripper $(2)
+endef
+
+# Called to compress a file that will be distributed
+__COMPRESS = \
+	tar \
+		--create \
+		--verbose --verbose \
+		--use-compress-program="$(3)" \
+		$(TAR_OPTIONS) \
+		--directory="$(1)" \
+		--file="$(2)" \
+		.
+
+COMPRESS_XZ   = $(call __COMPRESS,$(1),$(2),xz $(XZ_OPT))
+COMPRESS_ZSTD = $(call __COMPRESS,$(1),$(2),zstd $(ZSTD_OPT))
+
 define PAK
 	# Bringing the files to their right place.
 	@rm -rf $(DIR_TMP_PAK) && mkdir -p $(DIR_TMP_PAK)
@@ -347,12 +399,6 @@ define PAK
 		fi; \
 	done
 
-	# Replace variables in rootfiles
-	sed -i $(DIR_TMP_PAK)/ROOTFILES \
-		-e 's/BUILDTARGET/$(BUILDTARGET)/g' \
-		-e 's/KVER/$(KVER)/g' \
-		-e 's/xxxMACHINExxx/$(BUILD_ARCH)/g'
-
 	# Replace variables in scripts
 	sed -i $(DIR_TMP_PAK)/install.sh \
 		-e 's/xxxKVERxxx/$(KVER)/g'
@@ -362,13 +408,12 @@ define PAK
 
 	# Collect all files
 	rm -rf $(DIR_TMP_PAK)/root && mkdir -p $(DIR_TMP_PAK)/root
-	tar -c --exclude='#*' --exclude='proc/*' --exclude='dev/pts/*' --exclude='tmp/*' \
-		--exclude='__pycache__' \
-		-C / --files-from=$(DIR_TMP_PAK)/ROOTFILES | tar -x -C $(DIR_TMP_PAK)/root; \
-		exit $${PIPESTATUS[0]}
+
+	# Copy all files
+	$(call COPY_FILES,$(DIR_TMP_PAK)/ROOTFILES,$(DIR_TMP_PAK)/root)
 
 	# Compress tarball
-	cd $(DIR_TMP_PAK)/root && tar cf - * | xz $(XZ_OPT) > $(DIR_TMP_PAK)/files.tar.xz
+	$(call COMPRESS_XZ,$(DIR_TMP_PAK)/root,$(DIR_TMP_PAK)/files.tar.xz)
 
 	# Cleanup temporary files
 	rm -rf $(DIR_TMP_PAK)/root