[Buildroot] [PATCH 13/15] Makefile: Rsync global {TARGET, HOST}_DIR using exclusion file list

[Herve Codina <herve.codina@bootlin.com>]

On a per-package build, rsync final {TARGET,HOST}_DIR using
exclusion file list computed for each packages.
As we rsync only files generated by each packages, we need to
to do this rsync recursively on each dependencies to collect
all needed files. This is done based on existing
<PKG>_FINAL_RECURSIVE_DEPENDENCIES

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 Makefile | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 472af5a318..50bc6b4503 100644
--- a/Makefile
+++ b/Makefile
@@ -740,10 +740,28 @@ TARGET_DIR_FILES_LISTS = $(sort $(wildcard $(BUILD_DIR)/*/.files-list.txt))
 HOST_DIR_FILES_LISTS = $(sort $(wildcard $(BUILD_DIR)/*/.files-list-host.txt))
 STAGING_DIR_FILES_LISTS = $(sort $(wildcard $(BUILD_DIR)/*/.files-list-staging.txt))
 
+ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
+# rsync the contents of per-package directories
+# $1: space-separated list of packages to rsync from
+# $2: 'host' or 'target'
+# $3: destination directory
+# $4: exclude file list to use
+define per-package-rsync-delta
+	mkdir -p $(3)
+	$(foreach pkg,$(1),\
+		rsync -a --link-dest=$(PER_PACKAGE_DIR)/$(pkg)/$(strip $(2))/ \
+		--filter='merge $($(call UPPERCASE,$(pkg))_DIR)/$(strip $(4))' \
+		$(PER_PACKAGE_DIR)/$(pkg)/$(strip $(2))/ \
+		$(3)$(sep))
+endef
+endif
+
 .PHONY: host-finalize
 host-finalize: $(PACKAGES) $(HOST_DIR) $(HOST_DIR_SYMLINK)
 	@$(call MESSAGE,"Finalizing host directory")
-	$(call per-package-rsync,$(sort $(PACKAGES)),host,$(HOST_DIR))
+	$(call per-package-rsync-delta, $(sort $(foreach pkg, $(PACKAGES), \
+		$(pkg) $($(call UPPERCASE,$(pkg))_FINAL_RECURSIVE_DEPENDENCIES))), \
+		host,$(HOST_DIR),.files-final-rsync-host.exclude_rsync)
 
 .PHONY: staging-finalize
 staging-finalize: $(STAGING_DIR_SYMLINK)
@@ -751,7 +769,9 @@ staging-finalize: $(STAGING_DIR_SYMLINK)
 .PHONY: target-finalize
 target-finalize: $(PACKAGES) $(TARGET_DIR) host-finalize
 	@$(call MESSAGE,"Finalizing target directory")
-	$(call per-package-rsync,$(sort $(PACKAGES)),target,$(TARGET_DIR))
+	$(call per-package-rsync-delta, $(sort $(foreach pkg, $(PACKAGES), \
+		$(pkg) $($(call UPPERCASE,$(pkg))_FINAL_RECURSIVE_DEPENDENCIES))), \
+		target,$(TARGET_DIR),.files-final-rsync.exclude_rsync)
 	$(foreach hook,$(TARGET_FINALIZE_HOOKS),$($(hook))$(sep))
 	rm -rf $(TARGET_DIR)/usr/include $(TARGET_DIR)/usr/share/aclocal \
 		$(TARGET_DIR)/usr/lib/pkgconfig $(TARGET_DIR)/usr/share/pkgconfig \
-- 
2.31.1