git-gui/GIT-VERSION-GEN

   1 #!/bin/sh
   2
   3 GVF=GIT-VERSION-FILE
   4 DEF_VER=0.17.GITGUI
   5
   6 LF='
   7 '
   8
   9 tree_search ()
  10 {
  11         head=$1
  12         tree=$2
  13         for p in $(git rev-list --parents --max-count=1 $head 2>/dev/null)
  14         do
  15                 test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
  16                 vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
  17                 case "$vn" in
  18                 gitgui-[0-9]*) echo $vn; break;;
  19                 esac
  20         done
  21 }
  22
  23 # Always use the tarball version file if found, just
  24 # in case we are somehow contained in a larger git
  25 # repository that doesn't actually track our state.
  26 # (At least one package manager is doing this.)
  27 #
  28 # We may be a subproject, so try looking for the merge
  29 # commit that supplied this directory content if we are
  30 # not at the toplevel.  We probably will always be the
  31 # second parent in the commit, but we shouldn't rely on
  32 # that fact.
  33 #
  34 # If we are at the toplevel or the merge assumption fails
  35 # try looking for a gitgui-* tag.
  36
  37 if test -f version &&
  38    VN=$(cat version)
  39 then
  40         : happy
  41 elif prefix="$(git rev-parse --show-prefix 2>/dev/null)"
  42    test -n "$prefix" &&
  43    head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
  44    tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
  45    VN=$(tree_search $head $tree)
  46    case "$VN" in
  47    gitgui-[0-9]*) : happy ;;
  48    *) (exit 1) ;;
  49    esac
  50 then
  51         VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
  52 elif VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
  53    case "$VN" in
  54    gitgui-[0-9]*) : happy ;;
  55    *) (exit 1) ;;
  56    esac
  57 then
  58         VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
  59 else
  60         VN="$DEF_VER"
  61 fi
  62
  63 dirty=$(sh -c 'git diff-index --name-only HEAD' 2>/dev/null) || dirty=
  64 case "$dirty" in
  65 '')
  66         ;;
  67 *)
  68         VN="$VN-dirty" ;;
  69 esac
  70
  71 if test -r $GVF
  72 then
  73         VC=$(sed -e 's/^GITGUI_VERSION = //' <$GVF)
  74 else
  75         VC=unset
  76 fi
  77 test "$VN" = "$VC" || {
  78         echo >&2 "GITGUI_VERSION = $VN"
  79         echo "GITGUI_VERSION = $VN" >$GVF
  80 }