#!/bin/sh
# Check the format of GNU Emacs change log entries.

# Copyright 2019 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 <https://www.gnu.org/licenses/>.

COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3

# Prefer gawk if available, as it handles NUL bytes properly.
if type gawk >/dev/null 2>&1; then
  awk=gawk
else
  awk=awk
fi

exec $awk '
  # catch the case when someone ran git-commit with -s option,
  # which automatically adds Signed-off-by
  /^Signed-off-by: / {
    print "'\''Signed-off-by:'\'' in commit message"
    status = 1
  }
  END {
    if (status != 0) {
      print "Commit aborted; please see the file 'CONTRIBUTE'"
    }
    exit status
  }
' <"$COMMIT_MSG_FILE"