kernel kernel's headers against libiio headers in CI

As discussed in #392 and #396, this adds a small shell script which
downloads the kernel's iio header file, and checks channel types and
channel modifiers to make sure we aren't falling behind.

This will be checked once per Travis-CI build, and takes about 0.5 seconds.

Signed-off-by: Robin Getz <[email protected]>

CI/travis/before_install_linux

@@ -21,7 +21,7 @@ handle_default() {
 	sudo apt-get -qq update
 	sudo apt-get install -y cmake graphviz libaio-dev libavahi-client-dev \
 		libavahi-common-dev libusb-1.0-0-dev libxml2-dev rpm tar \
-		bzip2 gzip flex bison git python-pip
+		bzip2 gzip flex bison git python-pip wget
 	if [ -n "${GH_DOC_TOKEN}" ] ; then
 		sudo apt-get install -y doxygen
 	fi

CI/travis/check_kernel.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+set -e
+
+KERNEL_TYPES="/tmp/mainline_types.h"
+IIOH="./iio.h"
+CHANNELC="./channel.c"
+
+if [ ! -f ${IIOH} ] ; then
+	echo can not find ${IIOH}
+	exit 1
+fi
+
+if [ ! -f ${CHANNELC} ] ; then
+	echo can not find ${CHANNELC}
+	exit 1
+fi
+
+rm -f ${KERNEL_TYPES}
+wget -O ${KERNEL_TYPES} https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/uapi/linux/iio/types.h
+
+ret=0
+
+for enum in iio_chan_type iio_modifier
+do
+	echo looking for ${enum}
+	rm -f /tmp/kernel_${enum} /tmp/libiio_${enum}
+	sed "0,/${enum}/d" ${KERNEL_TYPES}  | sed -n '/}/q;p' > /tmp/kernel_${enum}
+	sed "0,/^enum.*${enum}/d" ${IIOH} | sed -n '/}/q;p' | grep -v IIO_CHAN_TYPE_UNKNOWN > /tmp/libiio_${enum}
+	echo Differences in ${enum}
+	# diff exit status of 1 means a difference, not an error
+	set +e
+	diff -u  /tmp/libiio_${enum} /tmp/kernel_${enum}
+	count=$(diff -u  /tmp/libiio_${enum} /tmp/kernel_${enum} | wc -l)
+	set -e
+	if [ "$count" -ne "0" ] ; then
+		ret=1
+		echo difference between upstream kernel types.h and iio.h in ${enum}
+	else
+		echo none
+	fi
+done
+
+for enum in iio_chan_type_name_spec modifier_names
+do
+	sed "0,/^static.*${enum}/d" ${CHANNELC} | sed -n '/}/q;p' | \
+		grep -v IIO_CHAN_TYPE_UNKNOWN > /tmp/libiio_${enum}
+done
+
+while IFS="" read -r p ; do
+	key=$(echo ${p//[[:space:],]/})
+	count=$(grep "\[$key\]" /tmp/libiio_iio_chan_type_name_spec | wc -l)
+	if [ "$count" -eq "0" ] ; then
+		echo $key missing from channel.c iio_chan_type_name_spec
+		ret=1
+	fi
+done < /tmp/libiio_iio_chan_type
+
+echo
+sed -i '/IIO_NO_MOD/d' /tmp/libiio_iio_modifier
+
+while IFS="" read -r p ; do
+	key=$(echo ${p//[[:space:],]/})
+	count=$(grep "\[$key\]" /tmp/libiio_modifier_names | wc -l)
+	if [ "$count" -eq "0" ] ; then
+		echo $key missing from channel.c modifier_names
+		ret=1
+	fi
+done < /tmp/libiio_iio_modifier
+
+exit $ret

CI/travis/make_linux

@@ -5,6 +5,11 @@ if [ "x${COVERITY_SCAN_PROJECT_NAME}" != "x" ] ; then exit 0; fi
 . CI/travis/lib.sh
 
 handle_default() {
+	# make sure we are up to date
+	if [ "$LDIST" = "DO_NOT_DEPLOY" ] ; then
+		./CI/travis/check_kernel.sh
+	fi
+
 	mkdir -p build
 	cd build