From 63f4488908d1379a4c1c702a391d6f0c331028d8 Mon Sep 17 00:00:00 2001
From: Robin Getz <robin.getz@analog.com>
Date: Mon, 30 Mar 2020 13:20:12 -0400
Subject: [PATCH] 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 <robin.getz@analog.com>
---
 CI/travis/check_kernel.sh | 70 +++++++++++++++++++++++++++++++++++++++
 CI/travis/make_linux      |  5 +++
 2 files changed, 75 insertions(+)
 create mode 100755 CI/travis/check_kernel.sh

diff --git a/CI/travis/check_kernel.sh b/CI/travis/check_kernel.sh
new file mode 100755
index 000000000..4cdfb62db
--- /dev/null
+++ b/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 $ret
diff --git a/CI/travis/make_linux b/CI/travis/make_linux
index 4cca1aa9c..92ffa01ef 100755
--- a/CI/travis/make_linux
+++ b/CI/travis/make_linux
@@ -31,6 +31,11 @@ handle_default() {
 		sh generateDocumentationAndDeploy.sh
 	fi
 	cd ..
+
+	# make sure we are up to date (once)
+	if [ "$LDIST" = "DO_NOT_DEPLOY" ] ; then
+		./CI/travis/check_kernel.sh
+	fi
 }
 
 handle_centos() {