Generate version string from git automatically

bld/get-version

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# Determine the version string to build into a binary.
+# When building in the git repository, we can use the output 
+# of "git describe" which gives an unequivocal answer.
+#
+# Failing that, we use the contents of the VERSION file
+# which has a set of references substituted into it by git.
+# If we can find one which matches $v[0-9].* then we assume it's
+# a version-number tag, else we just use the whole string.
+
+# we're called with pwd == src
+cd ..
+
+if [ -d .git ]; then
+     git describe
+else
+     vers=`cat VERSION | sed 's/[(), ]/\n/ g' | grep -m 1 $v[0-9]`
+
+     if [ $? -eq 0 ]; then
+         echo ${vers#v}
+     else
+         cat VERSION
+     fi
+fi
+
+exit 0
+