debian: Apply Ubuntu patch to add DKMS support.

I tested that installing openvswitch-datapath-dkms worked OK on my own
Debian machine.

The bulk of this patch is taken from downstream Ubuntu DKMS support written
by Chuck Short <zulcss@ubuntu.com>, version 1.2.0-1ubuntu1.  I made the
following changes:

  * Update debian/.gitignore.

  * Update debian/automake.mk.

  * Correct description in debian/control (it was a cut-and-paste from
    the openvswitch-datapath-source description without editing).

  * Fix up for --with-l26 to --with-linux and datapath/linux-2.6 to
    datapath/linux transitions.

CC: Chuck Short <zulcss@ubuntu.com>
CC: Dave Walker <DaveWalker@ubuntu.com>
Acked-by: Simon Horman <horms@verge.net.au>

7 files changed, 73 insertions, 1 deletions

diff --git a/debian/.gitignore b/debian/.gitignore
index 7b8dffea3..7e6d65626 100644
--- a/debian/.gitignore
+++ b/debian/.gitignore
@@ -11,6 +11,7 @@
 /openvswitch-common.copyright
 /openvswitch-controller
 /openvswitch-datapath-source
+/openvswitch-datapath-dkms
 /openvswitch-dbg
 /openvswitch-ipsec
 /openvswitch-pki
diff --git a/debian/automake.mk b/debian/automake.mk
index 7e166ddca..d2898301a 100644
--- a/debian/automake.mk
+++ b/debian/automake.mk
@@ -5,6 +5,7 @@ EXTRA_DIST += \
 	debian/control.modules.in \
 	debian/copyright \
 	debian/copyright.in \
+	debian/dkms.conf.in \
 	debian/dirs \
 	debian/openvswitch-brcompat.install \
 	debian/openvswitch-brcompat.manpages \
@@ -20,6 +21,8 @@ EXTRA_DIST += \
 	debian/openvswitch-controller.manpages \
 	debian/openvswitch-controller.postinst \
 	debian/openvswitch-datapath-module-_KVERS_.postinst.modules.in \
+	debian/openvswitch-datapath-dkms.postinst \
+	debian/openvswitch-datapath-dkms.prerm \
 	debian/openvswitch-datapath-source.README.Debian \
 	debian/openvswitch-datapath-source.copyright \
 	debian/openvswitch-datapath-source.dirs \
diff --git a/debian/control b/debian/control
index 1d09d94bd..8b3e7bf9f 100644
--- a/debian/control
+++ b/debian/control
@@ -15,7 +15,7 @@ Package: openvswitch-datapath-source
 Architecture: all
 Depends: module-assistant, bzip2, debhelper (>= 5.0.37), ${misc:Depends}
 Suggests: openvswitch-switch
-Description: Source code for Open vSwitch datapath Linux module
+Description: Open vSwitch datapath module source - module-assistant version
  This package provides the Open vSwitch datapath module source code
  that is needed by openvswitch-switch.  The kernel module can be built
  from it using module-assistant or make-kpkg.  README.Debian in this
@@ -23,6 +23,14 @@ Description: Source code for Open vSwitch datapath Linux module
  .
  Open vSwitch is a full-featured software-based Ethernet switch.
 
+Package: openvswitch-datapath-dkms
+Architecture: all
+Depends: dkms (>= 1.95), make, ${misc:Depends}
+Description: Open vSwitch datapath module source - DKMS version
+ This package provides the Open vSwitch datapath module source code
+ that is needed by openvswitch-switch.  DKMS can built the kernel
+ module from it.
+
 Package: openvswitch-common
 Architecture: linux-any
 Depends: ${shlibs:Depends}, openssl, ${misc:Depends}, python
diff --git a/debian/dkms.conf.in b/debian/dkms.conf.in
new file mode 100644
index 000000000..56c6398f5
--- /dev/null
+++ b/debian/dkms.conf.in
@@ -0,0 +1,9 @@
+PACKAGE_NAME="openvswitch"
+PACKAGE_VERSION="__VERSION__"
+MAKE="./configure --with-linux=/usr/src/linux-headers-`uname -r` ; make -C datapath/linux"
+BUILT_MODULE_NAME[0]=openvswitch_mod
+BUILT_MODULE_NAME[1]=brcompat_mod
+BUILT_MODULE_LOCATION[0]=datapath/linux/
+BUILT_MODULE_LOCATION[1]=datapath/linux/
+DEST_MODULE_LOCATION[0]=/kernel/drivers/net/openvswitch/
+DEST_MODULE_LOCATION[1]=/kernel/drivers/net/openvswitch/
diff --git a/debian/openvswitch-datapath-dkms.postinst b/debian/openvswitch-datapath-dkms.postinst
new file mode 100644
index 000000000..490311956
--- /dev/null
+++ b/debian/openvswitch-datapath-dkms.postinst
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+set -e
+
+package=openvswitch-datapath-dkms
+name=openvswitch
+
+version=`dpkg-query -W -f='${Version}' "$package" \
+        |rev|cut -d- -f2-|rev|cut -d':' -f2|tr -d "\n"`
+
+isadded=`dkms status -m "$name" -v "$version"`
+
+if [ "x${isadded}" = "x" ] ; then
+        dkms add -m "$name" -v "$version"
+fi
+
+if [ "$1" = 'configure' ] ; then
+        dkms build -m "$name" -v "$version" && dkms install -m "$name" -v "$version" || true
+fi
+
+#DEBHELPER#
diff --git a/debian/openvswitch-datapath-dkms.prerm b/debian/openvswitch-datapath-dkms.prerm
new file mode 100644
index 000000000..5c8ad3120
--- /dev/null
+++ b/debian/openvswitch-datapath-dkms.prerm
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+package=openvswitch-datapath-dkms
+name=openvswitch
+
+version=`dpkg-query -W -f='${Version}' "$package" \
+        |rev|cut -d- -f2-|rev|cut -d':' -f2|tr -d "\n"`
+
+dkms remove -m "$name" -v "$version" --all || true
+
+#DEBHELPER#
+
+exit 0
diff --git a/debian/rules b/debian/rules
index 37d321b7d..fb781e6c3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -13,6 +13,11 @@
 # Official build number.  Leave set to 0 if not an official build.
 BUILD_NUMBER = 0
 
+PACKAGE=openvswitch
+pdkms=openvswitch-datapath-dkms
+DEB_UPSTREAM_VERSION=$(shell dpkg-parsechangelog | sed -rne 's,^Version: ([^-]+).*,\1,p')
+srcfiles := $(filter-out debian, $(wildcard * .[^.]*))
+
 ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
 PARALLEL = -j$(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
 else
@@ -82,6 +87,16 @@ install-indep: build-indep
 	chmod 755 debian/openvswitch-datapath-source/usr/src/modules/openvswitch-datapath/debian/rules
 	cd debian/openvswitch-datapath-source/usr/src && tar -c modules | bzip2 -9 > openvswitch-datapath.tar.bz2 && rm -rf modules
 
+	#dkms stuff
+	# setup the dirs
+	dh_installdirs -p$(pdkms) usr/src/$(PACKAGE)-$(DEB_UPSTREAM_VERSION)
+
+	# copy the source
+	cd debian/$(pdkms)/usr/src/$(PACKAGE)-$(DEB_UPSTREAM_VERSION) && tar xvzf $(CURDIR)/_debian/openvswitch.tar.gz && mv openvswitch/* . && rmdir openvswitch
+
+	# Prepare dkms.conf from the dkms.conf.in template
+	sed "s/__VERSION__/$(DEB_UPSTREAM_VERSION)/g" debian/dkms.conf.in > debian/$(pdkms)/usr/src/$(PACKAGE)-$(DEB_UPSTREAM_VERSION)/dkms.conf
+
 install-arch: build-arch
 	dh_testdir
 	dh_testroot