Add a simple script for getting a version tag from a svn/git-svn/git

repository. Feel free to add support for your favorite VCS.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94077 91177308-0d34-0410-b5e6-96231b3b80d8

utils/GetSourceVersion

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+function usage() {
+   echo "usage: $0 <source root>"
+   echo "  Prints the source control revision of the given source directory,"
+   echo "  the exact format of the revision string depends on the source "
+   echo "  control system. If the source control system isn't known, the output"
+   echo "  is empty and the exit code is 1."
+   exit 1
+}
+
+if [ $# != 1 ] || [ ! -d $1 ]; then
+  usage;
+fi
+
+cd $1
+if [ -d .svn ]; then
+   svnversion
+elif [ -d .git/svn ]; then
+   git svn info | grep 'Revision:' | cut -d: -f2-
+elif [ -d .git ]; then
+   git log -1 --pretty=format:%H
+else
+   exit 1;
+fi
+
+exit 0