Merge pull request #5 from swiftdocker/gpg

Add GPG verification.

Author: hamin

Dockerfile

@@ -9,8 +9,13 @@ RUN apt-get update && \
     apt-get install -y build-essential wget clang libedit-dev python2.7 python2.7-dev libicu52 && \
     rm -rf /var/lib/apt/lists/*
 
-# Download Swift Ubuntu 14.04 Snapshot
+RUN wget -q -O - https://swift.org/keys/all-keys.asc | gpg --import -
+RUN gpg --keyserver hkp://pool.sks-keyservers.net --refresh-keys Swift
+
+# Download Swift Ubuntu 14.04 Snapshot, signature and verify
 RUN wget https://swift.org/builds/ubuntu1404/swift-2.2-SNAPSHOT-2015-12-01-b/swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04.tar.gz
+RUN wget https://swift.org/builds/ubuntu1404/swift-2.2-SNAPSHOT-2015-12-01-b/swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04.tar.gz.sig
+RUN gpg --verify swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04.tar.gz
 
 RUN tar -xvzf swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04.tar.gz && cd swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04