change updateSVN to also support REVISION fixed file and git

updateSVN

@@ -9,19 +9,26 @@ fi
 
 OWD=`pwd`
 cd "$1"
-SVN=svn
-for paths in /usr/local/bin /opt/R/arm64/bin; do
-  if [ -e "$paths/svn" ]; then
-    SVN="$paths/svn"
-  fi
-done 
-SVNREV=`$SVN info | sed -n 's/Revision:[ \t]*//p'`
-if [ -z "$SVNREV" -a -f .svn/entries ]; then
-  SVNREV=`sed -n 's/.*revision="\(.*\)".*/\1/p' .svn/entries|head -n 1`
-  if [ -z "$SVNREV" ]; then
-     # SVN 1.4 changed the format - this is a pure guess!! (line 4 = revision)
-     SVNREV=`sed -n -e '4 p' .svn/entries`
-  fi
+
+if [ -e .svn ]; then
+    SVN=svn
+    for paths in /usr/local/bin /opt/R/arm64/bin; do
+	if [ -e "$paths/svn" ]; then
+	    SVN="$paths/svn"
+	fi
+    done
+    SVNREV=`$SVN info | sed -n 's/Revision:[ \t]*//p'`
+    if [ -z "$SVNREV" -a -f .svn/entries ]; then
+	SVNREV=`sed -n 's/.*revision="\(.*\)".*/\1/p' .svn/entries|head -n 1`
+	if [ -z "$SVNREV" ]; then
+	    # SVN 1.4 changed the format - this is a pure guess!! (line 4 = revision)
+	    SVNREV=`sed -n -e '4 p' .svn/entries`
+	fi
+    fi
+elif [ -e REVISION ]; then
+    SVNREV=`cat REVISION`
+elif [ -e .git ]; then
+    SVNREV=`git rev-parse --short HEAD`
 fi
 echo "Revision: $SVNREV"