GIT-VERSION-GEN

   1 #!/usr/bin/env bash
   2
   3 (($# > 1)) && { echo >&2 "usage: $0 [<version file>]"; exit 1; }
   4 GVF="$1"
   5
   6 DEF_VER="unnamed_version"
   7 LF='
   8 '
   9
  10 # First see if there is a version file (included in release tarballs),
  11 # then try git-describe, then default.
  12 if [[ -f VERSION ]]; then
  13         VN=$(cat VERSION) || VN="$DEF_VER"
  14 elif [[ -d .git || -f .git ]] &&
  15         VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
  16         case "$VN" in
  17         *$LF*) (exit 1) ;;
  18         v[0-9]*)
  19                 git update-index -q --refresh
  20                 test -z "$(git diff-index --name-only HEAD --)" ||
  21                 VN="$VN-dirty" ;;
  22         esac
  23 then
  24         VN=$(echo "$VN" | sed -e 's/-/./g');
  25 else
  26         VN="$DEF_VER"
  27 fi
  28
  29 VN=$(expr "$VN" : v*'\(.*\)')
  30 echo "$VN"
  31
  32 [[ -z "$GVF" ]] && exit 0
  33 if [[ -r "$GVF" ]]; then
  34         pattern='^#define GIT_VERSION "'
  35         VC=$(grep "$pattern" < "$GVF" | sed -e "s/$pattern//; s/\"$//")
  36         [[ "$VN" == "$VC" ]] && exit 0
  37 fi
  38 echo >&2 "new git version: $VN"
  39 echo "/** \\file ${GVF##*/} Auto-generated version file. Do not edit. */" >$GVF
  40 echo "#define GIT_VERSION \"$VN\"" >> $GVF