Install tiller as well if it exists (#4648)

* Install tiller as well if it exists
Signed-off-by: Yuya Takeyama <sign.of.the.wolf.pentagram@gmail.com>

* Fix message

ref: https://github.com/helm/helm/pull/4648#discussion_r218229227Signed-off-by: Yuya Takeyama <sign.of.the.wolf.pentagram@gmail.com>

scripts/get

@@ -18,6 +18,7 @@
 # the package manager for Go: https://github.com/Masterminds/glide.sh/blob/master/get
 
 PROJECT_NAME="helm"
+TILLER_NAME="tiller"
 USE_SUDO="true"
 
 : ${HELM_INSTALL_DIR:="/usr/local/bin"}
@@ -142,8 +143,16 @@ installFile() {
   mkdir -p "$HELM_TMP"
   tar xf "$HELM_TMP_FILE" -C "$HELM_TMP"
   HELM_TMP_BIN="$HELM_TMP/$OS-$ARCH/$PROJECT_NAME"
-  echo "Preparing to install into ${HELM_INSTALL_DIR}"
+  TILLER_TMP_BIN="$HELM_TMP/$OS-$ARCH/$TILLER_NAME"
+  echo "Preparing to install $PROJECT_NAME and $TILLER_NAME into ${HELM_INSTALL_DIR}"
   runAsRoot cp "$HELM_TMP_BIN" "$HELM_INSTALL_DIR"
+  echo "$PROJECT_NAME installed into $HELM_INSTALL_DIR/$PROJECT_NAME"
+  if [ -x "$TILLER_TMP_BIN" ]; then
+    runAsRoot cp "$TILLER_TMP_BIN" "$HELM_INSTALL_DIR"
+    echo "$TILLER_NAME installed into $HELM_INSTALL_DIR/$TILLER_NAME"
+  else
+    echo "info: $TILLER_NAME binary was not found in this release; skipping $TILLER_NAME installation"
+  fi
 }
 
 # fail_trap is executed if an error occurs.
@@ -165,7 +174,6 @@ fail_trap() {
 # testVersion tests the installed client to make sure it is working.
 testVersion() {
   set +e
-  echo "$PROJECT_NAME installed into $HELM_INSTALL_DIR/$PROJECT_NAME"
   HELM="$(which $PROJECT_NAME)"
   if [ "$?" = "1" ]; then
     echo "$PROJECT_NAME not found. Is $HELM_INSTALL_DIR on your "'$PATH?'