xtensa-build-zephyr.py: create /lib/firmware tarball

With addition of loadable modules, SOF firmware installation depends
much more on symbolic links. Add a step to build script to create a
tarball of the installed firmware binaries in the build-staging-sof
tree. The created tarball (build-sof-staging/sof/sof.tar.gz) provides a
ready structure that can be unpacked to e.g. /lib/firmware on Linux
target machines.

Signed-off-by: Kai Vehmanen <[email protected]>

scripts/xtensa-build-zephyr.py

@@ -25,6 +25,7 @@
 
 import argparse
 import shlex
+import shutil
 import subprocess
 import pathlib
 import errno
@@ -1169,6 +1170,23 @@ def reproducible_checksum(platform, ri_file):
 	chk256 = sof_ri_info.EraseVariables(ri_file, parsed_ri, west_top / repro_output)
 	print('sha256sum {0}\n{1} {0}'.format(repro_output, chk256))
 
+def create_firmware_bundle():
+	if shutil.which('tar') is None:
+		print("tar tool not found, not creating firmware tarball")
+		return
+
+	# vendor directories (typically under /lib/firmware) to include
+        # in the tarball
+	vendor_dirs = [ 'intel']
+
+	build_top = pathlib.Path(west_top, 'build-sof-staging', 'sof')
+	tarball_name = 'sof.tar.gz'
+
+	if args.pristine:
+		tarball = build_top / tarball_name
+		tarball.unlink(missing_ok = True)
+
+	execute_command(['tar', 'zc', '--exclude=sof.tar.gz', '-f', tarball_name] + vendor_dirs, cwd=build_top, sof_log_env=True)
 
 def main():
 	parse_args()
@@ -1190,7 +1208,9 @@ def main():
 
 	build_rimage()
 	build_platforms()
+	create_firmware_bundle()
 	show_installed_files()
 
+
 if __name__ == "__main__":
 	main()