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-rwxr-xr-xbuild-aux/git-hooks/commit-msg90
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diff --git a/build-aux/git-hooks/commit-msg b/build-aux/git-hooks/commit-msg
new file mode 100755
index 0000000000..6a09eddf88
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+++ b/build-aux/git-hooks/commit-msg
@@ -0,0 +1,90 @@
+#!/bin/sh
+# Check the format of GNU Emacs change log entries.
+
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This file is part of GNU Emacs.
+
+# GNU Emacs is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# GNU Emacs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+# Written by Paul Eggert.
+
+# Use a UTF-8 locale if available, so that the UTF-8 check works.
+# Use U+00A2 CENT SIGN to test whether the locale works.
+cent_sign_utf8_octal='\302\242'
+at_sign=`
+ printf "${cent_sign_utf8_octal}@" |
+ awk '{print substr($0, 2)}' 2>/dev/null
+`
+if test "$at_sign" != @; then
+ at_sign=`
+ printf "${cent_sign_utf8_octal}@" |
+ LC_ALL=en_US.utf8 awk '{print substr($0, 2)}' 2>/dev/null
+ `
+ if test "$at_sign" = @; then
+ LC_ALL=en_US.utf8; export LC_ALL
+ fi
+fi
+
+# Check the log entry.
+exec awk '
+ /^#/ { next }
+
+ !/^.*$/ {
+ print "Invalid character (not UTF-8)"
+ status = 1
+ }
+
+ nlines == 0 && !/[^[:space:]]/ { next }
+
+ { nlines++ }
+
+ nlines == 1 && /^[[:space:]]/ {
+ print "White space at start of first line"
+ status = 1
+ }
+
+ nlines == 2 && /[^[:space:]]/ {
+ print "Nonempty second line"
+ status = 1
+ }
+
+ /[[:cntrl:]]/ {
+ print "Text contains control character; please use spaces instead of tabs"
+ status = 1
+ }
+
+ 72 < length && /[[:space:]]/ {
+ print "Line longer than 72 characters"
+ status = 1
+ }
+
+ 140 < length {
+ print "Word longer than 140 characters"
+ status = 1
+ }
+
+ /^Signed-off-by: / {
+ print "'Signed-off-by:' present"
+ status = 1
+ }
+
+ END {
+ if (nlines == 0) {
+ print "Empty change log entry"
+ status = 1
+ }
+ exit status
+ }
+' <"$1"