Add a shell script to generate the version string.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

version.sh

@@ -0,0 +1,61 @@
+#!/bin/sh
+#
+# This scripts takes the major and minor release numbers and adds
+# local version information from the git version control system.
+# Adapted from scripts/setlocalversion in the Linux kernel sources.
+#
+major=0
+minor=0
+extra=
+
+usage() {
+	echo "Usage: $0 [srctree]" >&2
+	exit 1
+}
+
+srctree=.
+if test $# -gt 0; then
+	srctree=$1
+	shift
+fi
+if test $# -gt 0 -o ! -d "$srctree"; then
+	usage
+fi
+
+scm_version()
+{
+	cd "$srctree"
+
+	# Check for git and a git repo.
+	if test -d .git && head=`git rev-parse --verify --short HEAD 2>/dev/null`; then
+
+		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
+		# it, because this version is defined in the top level Makefile.
+		if [ -z "`git describe --exact-match 2>/dev/null`" ]; then
+
+			# If we are past a tagged commit (like
+			# "v2.6.30-rc5-302-g72357d5"), we pretty print it.
+			if atag="`git describe 2>/dev/null`"; then
+				echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
+
+			# If we don't have a tag at all we print -g{commitish}.
+			else
+				printf '%s%s' -g $head
+			fi
+		fi
+
+		# Update index only on r/w media
+		[ -w . ] && git update-index --refresh --unmerged > /dev/null
+
+		# Check for uncommitted changes
+		if git diff-index --name-only HEAD | grep -qv "^scripts/package"; then
+			printf '%s' -dirty
+		fi
+
+		# All done with git
+		return
+	fi
+}
+
+res="${major}.${minor}${extra}$(scm_version)"
+echo "$res"