1 files changed, 50 insertions, 0 deletions
diff --git a/src/version.bash b/src/version.bash
new file mode 100755
index 000000000..fc899e2e3
--- /dev/null
+++ b/src/version.bash
@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# Copyright 2010 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+GOROOT=$(dirname $0)/..
+
+# If a version file created by -save is available, use it
+if [ -f "$GOROOT/VERSION" ]; then
+	cat $GOROOT/VERSION
+	exit 0
+fi
+
+# Otherwise, if hg doesn't work for whatever reason, fail
+if [ ! -d "$GOROOT/.hg" ] || ! hg version > /dev/null 2>&1; then
+	echo 'Unable to report version: hg and VERSION file missing' 1>&2
+	echo 'Generate VERSION with `src/version.bash -save` while hg is usable' 1>&2
+	exit 2
+fi
+
+# Get numerical revision
+VERSION=$(hg identify -n 2>/dev/null)
+if [ $? != 0 ]; then
+	OLD=$(hg identify | sed 1q)
+	VERSION=$(echo $OLD | awk '{print $1}')
+fi
+
+# Get branch type
+BRANCH=release
+if [ "$(hg identify -b 2>/dev/null)" == "default" ]; then
+	BRANCH=weekly
+fi
+
+# Find most recent known release or weekly tag.
+TAG=$(hg tags |
+	grep $BRANCH |
+	sed 's/:.*//' |
+	sort -rn -k2 |
+	awk -v ver=$VERSION '$2 <= ver && $1~/^(release|weekly)\./ {print $1}' |
+	sed -n 1p)
+
+if [ "$TAG" != "" ]; then
+	VERSION="$TAG $VERSION"
+fi
+
+if [ "$1" = "-save" ]; then
+	echo $VERSION > $GOROOT/VERSION
+else
+	echo $VERSION
+fi