m4/ax_detect_git_head.m4

   1 AC_DEFUN([AX_DETECT_GIT_HEAD], [
   2         AC_SUBST(GIT_HEAD_ID)
   3         AC_SUBST(GIT_HEAD)
   4         AC_SUBST(GIT_HEAD_VERSION)
   5         if test -f $srcdir/.git; then
   6                 gitdir=`GIT_DIR=$srcdir/.git git rev-parse --git-dir`
   7                 GIT_HEAD="$gitdir/index"
   8                 GIT_REPO="$gitdir"
   9                 GIT_HEAD_ID=`GIT_DIR=$GIT_REPO git describe --always`
  10         elif test -f $srcdir/.git/HEAD; then
  11                 GIT_HEAD="$srcdir/.git/index"
  12                 GIT_REPO="$srcdir/.git"
  13                 GIT_HEAD_ID=`GIT_DIR=$GIT_REPO git describe --always`
  14         elif test -f $srcdir/GIT_HEAD_ID; then
  15                 GIT_HEAD_ID=`cat $srcdir/GIT_HEAD_ID`
  16         else
  17                 mysrcdir=`(cd $srcdir; pwd)`
  18                 head=`basename $mysrcdir | sed -e 's/.*-//'`
  19                 head2=`echo $head | sed -e 's/[^0-9a-f]//'`
  20                 head3=`echo $head2 | sed -e 's/........................................//'`
  21                 if test "x$head3" = "x" -a "x$head" = "x$head2"; then
  22                         GIT_HEAD_ID="$head"
  23                 else
  24                         GIT_HEAD_ID="UNKNOWN"
  25                 fi
  26         fi
  27         if test -z "$GIT_REPO" ; then
  28                 GIT_HEAD_VERSION="$GIT_HEAD_ID"
  29         else
  30             GIT_HEAD_VERSION="\`GIT_DIR=$GIT_REPO git describe --always\`"
  31         fi
  32 ])