Place the META/ dir first in the target_files.zip.

To help early verification of a target_files.zip being uploaded to our
servers, we place the META/ directory first in the .zip file, so checks
against the product_id.txt and product_version.txt don't need to wait
for the whole file to upload.

Note that META/*filesystem_config.txt files are generated and added to
the .zip file at a later point, so they are not included at the
beginning.

Bug: 26806325
TEST=`make dist` and `unzip -l out/dist/edison-target_files-eng.$USER.zip` shows most META/ files first.

Change-Id: I1955645412688f5c7823063ed56606b251daccfd

core/Makefile

@@ -1724,8 +1724,11 @@ ifeq ($(BREAKPAD_GENERATE_SYMBOLS),true)
 	@# If breakpad symbols have been generated, add them to the zip.
 	$(hide) $(ACP) -r $(TARGET_OUT_BREAKPAD) $(zip_root)/BREAKPAD
 endif
-	@# Zip everything up, preserving symlinks
-	$(hide) (cd $(zip_root) && zip -qryX ../$(notdir $@) .)
+	@# Zip everything up, preserving symlinks and placing META/ files first to
+	@# help early validation of the .zip file while uploading it.
+	$(hide) (cd $(zip_root) && \
+	        zip -qryX ../$(notdir $@) ./META && \
+	        zip -qryXu ../$(notdir $@) .)
 	@# Run fs_config on all the system, vendor, boot ramdisk,
 	@# and recovery ramdisk files in the zip, and save the output
 	$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="SYSTEM/" } /^SYSTEM\// {print "system/" $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config -C -D $(TARGET_OUT) -S $(SELINUX_FC) > $(zip_root)/META/filesystem_config.txt