source: git-version.sh@ 17c9da8

#!/bin/sh

if ! git status > /dev/null; then
        # Either it's not a git repository, or git is unavaliable.
        # Just workaround.
        echo "<!ENTITY version           \"unknown\">"         >  version.ent
        echo "<!ENTITY versiond          \"unknown-systemd\">" >> version.ent
        echo "<!ENTITY releasedate       \"unknown\">"         >> version.ent
        echo "<!ENTITY copyrightdate     \"1999-2021\">"       >> version.ent
        exit 0
fi

export LC_ALL=en_US.utf8
export TZ=US/Pacific

commit_date=$(git show -s --format=format:"%cd" --date=local)
short_date=$(date --date "$commit_date" "+%Y-%m-%d")

year=$(date --date "$commit_date" "+%Y")
month=$(date --date "$commit_date" "+%B")
month_digit=$(date --date "$commit_date" "+%m")
day_digit=$(date --date "$commit_date" "+%d")
day=$(echo $day_digit | sed 's/^0//')

case $day in
        "1" | "21" | "31" ) suffix="st";;
        "2" | "22" ) suffix="nd";;
        "3" | "23" ) suffix="rd";;
        * ) suffix="th";;
esac

full_date="$month $day$suffix, $year"

sha="g$(git describe --always)"
version="$short_date-$sha"

if [ "$(git diff HEAD | wc -l)" != "0" ]; then
        version="$version-MODIFIED"
fi

echo "<!ENTITY day               \"$day_digit\">"          >  version.ent
echo "<!ENTITY month             \"$month_digit\">"        >> version.ent
echo "<!ENTITY year              \"$year\">"               >> version.ent
echo "<!ENTITY copyrightdate     \"2001-$year\">"          >> version.ent
echo "<!ENTITY version           \"$version\">"            >> version.ent
echo "<!ENTITY short-version     \"$sha\">"                >> version.ent
echo "<!ENTITY releasedate       \"$full_date\">"          >> version.ent
echo "<!ENTITY pubdate           \"$short_date\">"         >> version.ent