#!/bin/sh
#
# Called by git-commit with one argument, the name of the file
# that has the commit message.  The hook should exit with non-zero
# status after issuing an appropriate message if it wants to stop the
# commit.  The hook is allowed to edit the commit message file.
#
# To enable this hook, make this file executable.

# avoid [[ which is not POSIX sh.

if test "$#" != 1 ; then
    echo "$0 requires an argument."
    exit 1
fi

if test ! -f "$1" ; then
    echo "file does not exist: $1"
    exit 1
fi

abort() {
    cp $1 $1.save
    cat >&2 <<EOF
Commit aborted, your commit message was saved as '$1.save'.

Reason: $2

EOF
    exit 1
}

test "" = "$(grep '^Signed-off-by: ' "$1" |
         sort | uniq -c | sed -e '/^[         ]*1[         ]/d')" || {
    abort "$1" "Duplicate Signed-off-by lines."
}

# Check that the first line exists, and is not an asterisk

if [ -z "`head -n 1 $1 | grep -v '^[[:blank:]]*\*$'`" ] ; then
    abort "$1" "Please provide the general description on the first line."
fi

# ...and that it is not too long

len="`head -n 1 $1 | tr -d '\n' | wc -c`"
if [ "$len" -gt 79 ] ; then
    abort "$1" "The first line is $len characters, please try to fit into 79 characters."
fi

fdo_regex='fdo#[0-9]+'
if egrep -q "$fdo_regex" $1; then
    for bugid in `head -n 1 $1 |egrep -o "$fdo_regex" |sed 's/fdo#//'`
    do
        if [ "`echo $bugid |sed 's/fdo#//'`" -gt 88775 ]; then
            abort "$1" "The first line contains a suspicious fdo# rereference: 'fdo#$bugid', did you mean tdf#?"
        fi
    done
fi

# ...and that it does not continue on the second line
if [ "`wc -l < $1`" -gt 1 -a -n "`head -n 2 $1 | tail -n 1 | sed 's/^#.*//'`" ] ; then
    abort "$1" "The second line is not empty - maybe the first line continues there?"
fi

# Check that the message is not a ChangeLog-like one

if [ -n "`head -n 1 $1 | grep '^[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}.*<.*@.*>'`" ] ; then
    abort "$1" "The commit message looks like ChangeLog, please use the git form."
fi

# Check that lines do not start with '#<something>' (possibly accidental commit,
# such as starting the message with '#ifdef', git commits start with '#<whitespace>'.

if [ -n "`grep '^#[^[:blank:]]' $1`" ] ; then
    abort "$1" "Possible accidental comment in the commit message (leading # without space)."
fi

# From Gerrit Code Review 2.16.15
#
# Part of Gerrit Code Review (https://www.gerritcodereview.com/)
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Do not create a change id if requested
if test "false" = "`git config --bool --get gerrit.createChangeId`" ; then
    exit 0
fi

# $RANDOM will be undefined if not using bash, so don't use set -u
random=$( (whoami ; hostname ; date; cat $1 ; echo $RANDOM) | git hash-object --stdin)
dest="$1.tmp.${random}"

trap 'rm -f "${dest}"' EXIT

if ! git stripspace --strip-comments < "$1" > "${dest}" ; then
    echo "cannot strip comments from $1"
    exit 1
fi

if test ! -s "${dest}" ; then
    echo "file is empty: $1"
    exit 1
fi

# Avoid the --in-place option which only appeared in Git 2.8
# Avoid the --if-exists option which only appeared in Git 2.15
if ! git -c trailer.ifexists=doNothing interpret-trailers \
        --trailer "Change-Id: I${random}" < "$1" > "${dest}" ; then
    echo "cannot insert change-id line in $1"
    exit 1
fi

if ! mv "${dest}" "$1" ; then
    echo "cannot mv ${dest} to $1"
    exit 1
fi

#------------------ copied gerrit commit-msg hook to handle ChangeId <--

exit 0

# vi:set shiftwidth=4 expandtab: