[PATCH v6 4/5] Provide include file for easy custom module builds

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

This provides an include for custom kernel modules. We choose an include
over a class as we carry a couple of files to debianize the module. The
user just needs to specify the module SRC_URI, and those sources must be
then reside in a separate directory which is - as usual - defined via S.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Changes in v6:
 - fix module build on wheezy-arm and (upcoming) stretch-arm64

This allows to keep v5 of patch 5. Sorry for the mess, but I initially
thought it was an issue with old wheezy on special ARM hardware only.
But when it also popped up on stretch-arm64, I finally analyzed it.

 .../linux-module/files/debian/changelog            |  5 +++++
 .../linux-module/files/debian/compat               |  1 +
 .../linux-module/files/debian/control              | 11 ++++++++++
 .../recipes-kernel/linux-module/files/debian/rules | 15 ++++++++++++++
 meta/recipes-kernel/linux-module/module.inc        | 24 ++++++++++++++++++++++
 5 files changed, 56 insertions(+)
 create mode 100644 meta/recipes-kernel/linux-module/files/debian/changelog
 create mode 100644 meta/recipes-kernel/linux-module/files/debian/compat
 create mode 100644 meta/recipes-kernel/linux-module/files/debian/control
 create mode 100755 meta/recipes-kernel/linux-module/files/debian/rules
 create mode 100644 meta/recipes-kernel/linux-module/module.inc

diff --git a/meta/recipes-kernel/linux-module/files/debian/changelog b/meta/recipes-kernel/linux-module/files/debian/changelog
new file mode 100644
index 0000000..c1c3516
--- /dev/null
+++ b/meta/recipes-kernel/linux-module/files/debian/changelog
@@ -0,0 +1,5 @@
+@PN@ (@PV@) unstable; urgency=low
+
+  * Generated package.
+
+ -- ISAR project <isar-users@googlegroups.com>  Tue, 6 Feb 2018 00:00:00 +0000
diff --git a/meta/recipes-kernel/linux-module/files/debian/compat b/meta/recipes-kernel/linux-module/files/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/meta/recipes-kernel/linux-module/files/debian/compat
@@ -0,0 +1 @@
+9
diff --git a/meta/recipes-kernel/linux-module/files/debian/control b/meta/recipes-kernel/linux-module/files/debian/control
new file mode 100644
index 0000000..707f857
--- /dev/null
+++ b/meta/recipes-kernel/linux-module/files/debian/control
@@ -0,0 +1,11 @@
+Source: @PN@
+Section: kernel
+Priority: optional
+Standards-Version: 3.9.6
+Build-Depends: linux-headers-@KERNEL_NAME@
+Maintainer: ISAR project <isar-users@googlegroups.com>
+
+Package: @PN@
+Architecture: any
+Depends: linux-image-@KERNEL_NAME@
+Description: @DESCRIPTION@
diff --git a/meta/recipes-kernel/linux-module/files/debian/rules b/meta/recipes-kernel/linux-module/files/debian/rules
new file mode 100755
index 0000000..46cf977
--- /dev/null
+++ b/meta/recipes-kernel/linux-module/files/debian/rules
@@ -0,0 +1,15 @@
+#!/usr/bin/make -f
+
+# Debian rules for custom kernel module build
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2018
+#
+# SPDX-License-Identifier: MIT
+
+export KDIR=$(shell ls -d /lib/modules/*/build)
+
+export DEB_BUILD_OPTIONS=parallel=$(shell nproc)
+
+%:
+	CFLAGS= LDFLAGS= dh $@ --parallel
diff --git a/meta/recipes-kernel/linux-module/module.inc b/meta/recipes-kernel/linux-module/module.inc
new file mode 100644
index 0000000..aa232f7
--- /dev/null
+++ b/meta/recipes-kernel/linux-module/module.inc
@@ -0,0 +1,24 @@
+# Custom kernel module recipe include
+#
+# This software is a part of ISAR.
+# Copyright (c) Siemens AG, 2018
+#
+# SPDX-License-Identifier: MIT
+
+FILESPATH =. "${LAYERDIR_core}/recipes-kernel/linux-module/files:"
+
+DESCRIPTION ?= "Custom kernel module ${PN}"
+
+DEPENDS += "linux-headers-${KERNEL_NAME}"
+
+SRC_URI += "file://debian/"
+
+inherit dpkg
+
+dpkg_runbuild_prepend() {
+    cp -r ${WORKDIR}/debian ${WORKDIR}/${S}/
+    sed -i -e 's/@PN@/${PN}/g' -e 's/@PV@/${PV}/g' \
+           -e 's/@KERNEL_NAME@/${KERNEL_NAME}/g' \
+           -e 's/@DESCRIPTION@/${DESCRIPTION}/g' \
+        ${WORKDIR}/${S}/debian/changelog ${WORKDIR}/${S}/debian/control
+}
-- 
2.13.6