make_git_source_version.sh

#!/usr/bin/env sh

if [ -f "./.release" ]; then
  export RELEASED=1
  export RELENG="prepared"
else
  export RELENG="built"
fi
rm -f ./.release 2>/dev/null

get_git_info() {
  if command command true 2>/dev/null 1>&2; then
    if command git version 2>/dev/null 1>&2; then
      GITTEST=$(git version 2>/dev/null)
      # shellcheck disable=SC2236
      if [ -n "$GITTEST" ] && [ ! -z "$GITTEST" ]; then
        BRANCH=$(git branch --show-current 2>/dev/null)
        if [ -n "$RELEASED" ] && [ ! -z "$RELEASED" ]; then
          GITVER=$(git describe --tags --always 2>/dev/null |
            cut -d "-" -f 1 2>/dev/null)
        else
          GITVER=$(git describe --tags --dirty --broken --long --always \
            2>/dev/null)
        fi

        if [ ! -n "$BRANCH" ] || [ -z "$BRANCH" ]; then
          BRANCH="nobranch"
        fi

        if [ ! -n "$RELEASED" ] && [ -z "$RELEASED" ]; then
          if [ -n "$GITVER" ] && [ ! -z "$GITVER" ]; then
            GIT_OUT=" $GITVER-$BRANCH"
          fi
        fi
        if [ -n "$GITVER" ] && [ ! -z "$GITVER" ]; then
          GIT_OUT=" $GITVER"
        fi
      fi
    fi
  fi

  GIT_SOURCE_INFO="DUMA$GIT_OUT"
  GIT_SOURCE_XFRM=$(printf '%s\n' "$GIT_SOURCE_INFO" |
    sed -e 's/\VERSION_//' -e 's/_/\./g' 2>/dev/null)

  # shellcheck disable=SC2236
  if [ -n "$GIT_SOURCE_XFRM" ] && [ ! -z "$GIT_SOURCE_XFRM" ]; then
    printf '%s\n' "$GIT_SOURCE_XFRM"
  else
    printf '%s\n' "$GIT_SOURCE_INFO"
  fi
}

get_utc_date() {
  UTC_DATE=$(TZ=UTC date -u "+%D %T" 2>/dev/null)
  # shellcheck disable=SC2236
  if [ -n "$UTC_DATE" ] && [ ! -z "$UTC_DATE" ]; then
    UTC_DATE_INFO=", $RELENG $UTC_DATE"
  else
    UTC_DATE_INFO=""
  fi
  printf '%s\n' "$UTC_DATE_INFO"
}

BUILD_VER=$(get_git_info)
BUILD_UTC=$(get_utc_date)

printf '%s\n' "// Auto-generated git information." >verinfo.h
printf '%s\n' "#define GIT_SOURCE_VERSION \"$BUILD_VER$BUILD_UTC (\"" >>verinfo.h