1 files changed, 46 insertions, 0 deletions
diff --git a/version.sh b/version.sh
new file mode 100755
index 0000000..32fd6ec
--- /dev/null
+++ b/version.sh
@@ -0,0 +1,46 @@
+#! /bin/bash
+#
+# version.sh: create a version string for use by configure.ac
+
+version=
+datefmt='%Y%m%d'
+
+export GIT_DIR=$(dirname $0)/.git/
+
+if head=$(git rev-parse --short=8 --verify HEAD 2>/dev/null); then
+
+	suffix=''
+	# Add a '-dirty' suffix for uncommitted changes.
+	if git diff-index HEAD | read dummy; then
+		suffix=-dirty
+	fi
+
+	if tag=$(git describe --tags --exact-match 2>/dev/null); then
+		# use a tag; remove any 'v' prefix from v<VERSION> tags
+		tag=${tag#v}
+		version=$(printf "%s%s" ${tag} ${suffix})
+	else
+		# Use the git commit revision for the package version, and add
+		# a date prefix for easy comparisons.
+		date=$(git log --pretty=format:"%ct" -1 HEAD)
+		version=$(printf "%($datefmt)T.g%s%s" ${date} ${head} ${suffix})
+	fi
+else
+	# Check if a specific version is set, eg: by buildroot
+	if [ ! -z "$PACKAGE_VERSION" ];
+	then
+		# Full git hash
+		len=$(echo -n "${PACKAGE_VERSION}" | wc -c)
+		if [[ ${len} == 40 ]]; then
+			version=`echo -n ${PACKAGE_VERSION} | \
+				sed "s/^\([0-9a-f]\{7\}\).*/\1/;"`
+		else
+			version="$PACKAGE_VERSION"
+		fi
+	else
+		# Default to current date and time.
+		version="$(date +dev.$datefmt)"
+	fi
+fi
+
+echo $version