scripts/get_source_date_epoch.sh

   1 #!/usr/bin/env bash
   2 export LANG=C
   3 export LC_ALL=C
   4
   5 if [ -n "$TOPDIR" ]; then
   6         cd "$TOPDIR" || exit 1
   7 fi
   8
   9 SOURCE="${1:-.}"
  10
  11 try_version() {
  12         [ -f "$SOURCE/version.date" ] || return 1
  13         SOURCE_DATE_EPOCH=$(cat "$SOURCE/version.date")
  14         [ -n "$SOURCE_DATE_EPOCH" ]
  15 }
  16
  17 try_git() {
  18         SOURCE_DATE_EPOCH=$(git -C "$SOURCE" log -1 --format=format:%ct \
  19                 "$SOURCE" 2>/dev/null)
  20         [ -n "$SOURCE_DATE_EPOCH" ]
  21 }
  22
  23 try_hg() {
  24         SOURCE_DATE_EPOCH=$(hg --cwd "$SOURCE" log --template '{date}' -l 1 \
  25                 "$SOURCE" 2>/dev/null | cut -d. -f1)
  26         [ -n "$SOURCE_DATE_EPOCH" ]
  27 }
  28
  29 try_mtime() {
  30         SOURCE_DATE_EPOCH=$(perl -e 'print((stat $ARGV[0])[9])' "$0")
  31         [ -n "$SOURCE_DATE_EPOCH" ]
  32 }
  33
  34 try_version || try_git || try_hg || try_mtime || SOURCE_DATE_EPOCH=""
  35 echo "$SOURCE_DATE_EPOCH"