[PATCH] template: Make templates passthrough

[Anton Mikanovich <amikan@ilbers.de>]

There is no need to store original template files after the conversion
in real scenarios. To make working folder little cleaner we can remove
them. This can be disabled with TEMPLATE_FILES_KEEP variable.
Moreover output file should have exactly the same flags as input one,
which is usefull for the cases like debian/rules or other executables.
So we should copy this part of metadata after the conversion.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
---
 meta/classes/template.bbclass              | 7 ++++++-
 meta/recipes-kernel/linux/linux-custom.inc | 3 ---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/meta/classes/template.bbclass b/meta/classes/template.bbclass
index fb9d1186..f5760e15 100644
--- a/meta/classes/template.bbclass
+++ b/meta/classes/template.bbclass
@@ -4,11 +4,12 @@
 # SPDX-License-Identifier: MIT
 
 TEMPLATE_FILES ?= ""
+TEMPLATE_FILES_KEEP ?= "0"
 TEMPLATE_VARS ?= "PN PV DESCRIPTION HOMEPAGE MAINTAINER DISTRO_ARCH"
 
 do_transform_template[vardeps] = "TEMPLATE_FILES ${TEMPLATE_VARS}"
 python do_transform_template() {
-    import subprocess, contextlib
+    import subprocess, contextlib, shutil
 
     workdir = os.path.normpath(d.getVar('WORKDIR', True))
 
@@ -56,5 +57,9 @@ python do_transform_template() {
                                           stdout=output, env=env))
             if process.wait() != 0:
                 bb.fatal("processing of template failed")
+
+        shutil.copymode(template_file, output_file)
+        if d.getVar('TEMPLATE_FILES_KEEP', True) != '1':
+            os.remove(template_file)
 }
 addtask do_transform_template after do_unpack
diff --git a/meta/recipes-kernel/linux/linux-custom.inc b/meta/recipes-kernel/linux/linux-custom.inc
index ed89aa09..57740860 100644
--- a/meta/recipes-kernel/linux/linux-custom.inc
+++ b/meta/recipes-kernel/linux/linux-custom.inc
@@ -122,9 +122,6 @@ do_prepare_build_prepend() {
 	rm -rf ${S}/debian
 	cp -r ${WORKDIR}/debian ${S}/
 
-	# remove templates from the source tree
-	find ${S}/debian -name *.tmpl | xargs rm -f
-
 	# rename install/remove hooks to match user-specified name for our linux-image package
 	mv ${S}/debian/linux-image.postinst ${S}/debian/linux-image-${KERNEL_NAME_PROVIDED}.postinst
 	mv ${S}/debian/linux-image.postrm ${S}/debian/linux-image-${KERNEL_NAME_PROVIDED}.postrm
-- 
2.20.1