[dpdk-dev,v2] scripts: check commit formatting

diff --git a/MAINTAINERS b/MAINTAINERS
index f213500..1953ea2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25,6 +25,7 @@  M: Thomas Monjalon <thomas.monjalon@6wind.com>
 T: git://dpdk.org/dpdk
 F: MAINTAINERS
 F: scripts/check-maintainers.sh
+F: scripts/check-git-log.sh
 F: scripts/checkpatches.sh
 F: scripts/load-devel-config.sh
 F: scripts/test-build.sh
diff --git a/doc/guides/contributing/patches.rst b/doc/guides/contributing/patches.rst
index 3ebe95b..06af91d 100644
--- a/doc/guides/contributing/patches.rst
+++ b/doc/guides/contributing/patches.rst
@@ -258,6 +258,14 @@  Where:
 * ``-v``: verbose.
 * ``patchX``: path to one or more patches.
 
+Then the git logs should be checked using the ``check-git-log.sh`` script.
+
+The script usage is::
+
+   check-git-log.sh [range]
+
+Where the range is a ``git log`` option.
+
 
 .. _contrib_check_compilation:
 
diff --git a/scripts/check-git-log.sh b/scripts/check-git-log.sh
new file mode 100755
index 0000000..ce6c15e
--- /dev/null
+++ b/scripts/check-git-log.sh
@@ -0,0 +1,140 @@ 
+#! /bin/sh
+
+# BSD LICENSE
+#
+# Copyright 2016 6WIND S.A.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+#   * Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#   * Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in
+#     the documentation and/or other materials provided with the
+#     distribution.
+#   * Neither the name of 6WIND S.A. nor the names of its
+#     contributors may be used to endorse or promote products derived
+#     from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Check commit logs (headlines and references)
+#
+# If any doubt about the formatting, please check in the most recent history:
+#	git log --format='%>|(15)%cr   %s' --reverse | grep -i <pattern>
+
+if [ "$1" = '-h' -o "$1" = '--help' ] ; then
+	cat <<- END_OF_HELP
+	usage: $(basename $0) [-h] [range]
+
+	Check commit log formatting.
+	The git range can be specified as a "git log" option,
+	e.g. -1 to check only the latest commit.
+	The default range starts from origin/master to HEAD.
+	END_OF_HELP
+	exit
+fi
+
+range=${1:-origin/master..}
+
+headlines=$(git log --format='%s' $range)
+bodylines=$(git log --format='%b' $range)
+tags=$(git log --format='%b' $range | grep -i -e 'by *:' -e 'fix.*:')
+fixes=$(git log --format='%h %s' $range | grep -i ': *fix' | cut -d' ' -f1)
+
+# check headline format (spacing, no punctuation, no code)
+bad=$(echo "$headlines" | grep \
+	-e '	' \
+	-e '^ ' \
+	-e ' $' \
+	-e '\.$' \
+	-e '[,;!?&|]' \
+	-e ':.*_' \
+	-e '^[^:]*$' \
+	-e ':[^ ]' \
+	-e ' :' \
+	| sed 's,^,\t,')
+[ -z "$bad" ] || printf "Wrong headline format:\n$bad\n"
+
+# check headline label for common typos
+bad=$(echo "$headlines" | grep \
+	-e '^example[:/]' \
+	-e '^apps/' \
+	-e '^testpmd' \
+	-e 'test-pmd' \
+	-e '^bond:' \
+	| sed 's,^,\t,')
+[ -z "$bad" ] || printf "Wrong headline label:\n$bad\n"
+
+# check headline lowercase for first words
+bad=$(echo "$headlines" | grep \
+	-e '^.*[A-Z].*:' \
+	-e ': *[A-Z]' \
+	| sed 's,^,\t,')
+[ -z "$bad" ] || printf "Wrong headline uppercase:\n$bad\n"
+
+# check headline uppercase (Rx/Tx, VF, L2, MAC, Linux, ARM...)
+bad=$(echo "$headlines" | grep \
+	-e 'rx\|tx\|RX\|TX' \
+	-e '\<[pv]f\>' \
+	-e '\<l[234]\>' \
+	-e ':.*\<dma\>' \
+	-e ':.*\<pci\>' \
+	-e ':.*\<mtu\>' \
+	-e ':.*\<mac\>' \
+	-e ':.*\<vlan\>' \
+	-e ':.*\<rss\>' \
+	-e ':.*\<freebsd\>' \
+	-e ':.*\<linux\>' \
+	-e ':.*\<tilegx\>' \
+	-e ':.*\<tile-gx\>' \
+	-e ':.*\<arm\>' \
+	-e ':.*\<armv7\>' \
+	-e ':.*\<armv8\>' \
+	| sed 's,^,\t,')
+[ -z "$bad" ] || printf "Wrong headline lowercase:\n$bad\n"
+
+# check headline length (60 max)
+bad=$(echo "$headlines" | awk 'length>60 {print}' | sed 's,^,\t,')
+[ -z "$bad" ] || printf "Headline too long:\n$bad\n"
+
+# check body lines length (75 max)
+bad=$(echo "$bodylines" | awk 'length>75 {print}' | sed 's,^,\t,')
+[ -z "$bad" ] || printf "Line too long:\n$bad\n"
+
+# check tags spelling
+bad=$(echo "$tags" |
+	grep -v '^\(Reported\|Suggested\|Signed-off\|Acked\|Reviewed\|Tested\)-by: [^,]* <.*@.*>$' |
+	grep -v '^Fixes: [0-9a-f]\{7\}[0-9a-f]* (".*")$' |
+	sed 's,^.,\t&,')
+[ -z "$bad" ] || printf "Wrong tag:\n$bad\n"
+
+# check missing Fixes: tag
+bad=$(for fix in $fixes ; do
+	git log --format='%b' -1 $fix | grep -q '^Fixes: ' ||
+		git log --format='\t%s' -1 $fix
+done)
+[ -z "$bad" ] || printf "Missing 'Fixes' tag:\n$bad\n"
+
+# check Fixes: reference
+IFS='
+'
+fixtags=$(echo "$tags" | grep '^Fixes: ')
+bad=$(for fixtag in $fixtags ; do
+	hash=$(echo "$fixtag" | sed 's,^Fixes: \([0-9a-f]*\).*,\1,')
+	good="Fixes: $hash "$(git log --format='("%s")' -1 $hash 2>&-)
+	printf "$fixtag" | grep -v "^$good$"
+done | sed 's,^,\t,')
+[ -z "$bad" ] || printf "Wrong 'Fixes' reference:\n$bad\n"