Merge pull request #277 from edx/will/release-script

Add a bash script for cutting a release branch

scripts/release.sh

+#!/usr/bin/env bash
+
+# Use YYYY-MM-DD format
+DATE=`date +%Y-%m-%d`
+
+read -p "Cut the release branch?  (You may lose changes that are not committed or stashed.)  [y/n]  " RESP
+if [ "$RESP" != "y" ]; then
+    exit 0
+fi
+
+echo "Updating origin/master..."
+git fetch && git checkout -q origin/master
+
+echo "Creating the release branch..."
+BRANCH="rc/$DATE"
+git branch | grep -q "$BRANCH$"
+if [ $? -eq 0 ]; then
+    read -p "Branch $BRANCH already exists.  Delete it? [y/n]  " RESP
+    if [ "$RESP" = "y" ]; then
+        echo "Deleting $BRANCH"
+        git branch -D $BRANCH
+    else
+        exit 0
+    fi
+fi
+
+git checkout -b $BRANCH
+echo " == Created branch $BRANCH"
+
+echo "Tagging the release branch..."
+TAG="release-$DATE"
+git tag | grep -q "$TAG"
+if [ $? -eq 0 ]; then
+    read -p "Tag $TAG already exists.  Delete it? [y/n]  " RESP
+    if [ "$RESP" = "y" ]; then
+        echo "Deleting $TAG"
+        git tag -d $TAG
+    else
+        exit 0
+    fi
+fi
+
+git tag -m "release for $DATE" "$TAG"
+echo " == Created tag $TAG"
+
+read -p "Push branch $BRANCH and tag $TAG to origin? [y/n]  " RESP
+if [ "$RESP" = "y" ]; then
+    git push origin $BRANCH && git push origin $TAG
+    echo " == Pushed branch $BRANCH and tag $TAG to origin"
+fi
+
+echo " == Finished =="
+echo "Branch: $BRANCH"
+echo "Tag: $TAG"
+echo "Commit: `git rev-parse HEAD`"