Fix `vagrant provision` with a bunch of guards

Vagrantfile

@@ -8,17 +8,19 @@ DEFAULT_CPU_COUNT = 2
 $script = <<SCRIPT
 GO_VERSION="1.7.5"
 
+export DEBIAN_FRONTEND=noninteractive
+
 sudo dpkg --add-architecture i386
 sudo apt-get update
 
 # Install base dependencies
-sudo apt-get install -y build-essential curl git-core mercurial bzr \
-     libpcre3-dev pkg-config zip default-jre qemu silversearcher-ag jq htop \
-     vim unzip tree \
-     liblxc1 lxc-dev lxc-templates                      \ # lxc
-     gcc-5-aarch64-linux-gnu binutils-aarch64-linux-gnu \ # arm64
-     libc6-dev-i386 linux-libc-dev:i386                 \ # i386
-     gcc-5-arm-linux-gnueabi gcc-5-multilib-arm-linux-gnueabi binutils-arm-linux-gnueabi # arm
+sudo DEBIAN_FRONTEND=noninteractive apt-get install -y build-essential curl git-core mercurial bzr \
+     libpcre3-dev pkg-config zip default-jre qemu silversearcher-ag \
+     jq htop vim unzip tree                             \
+     liblxc1 lxc-dev lxc-templates                      \
+     gcc-5-aarch64-linux-gnu binutils-aarch64-linux-gnu \
+     libc6-dev-i386 linux-libc-dev:i386                 \
+     gcc-5-arm-linux-gnueabi gcc-5-multilib-arm-linux-gnueabi binutils-arm-linux-gnueabi
 
 # Setup go, for development of Nomad
 SRCROOT="/opt/go"
@@ -28,12 +30,16 @@ SRCPATH="/opt/gopath"
 ARCH=`uname -m | sed 's|i686|386|' | sed 's|x86_64|amd64|'`
 
 # Install Go
-cd /tmp
-wget -q https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${ARCH}.tar.gz
-tar -xf go${GO_VERSION}.linux-${ARCH}.tar.gz
-sudo mv go $SRCROOT
-sudo chmod 775 $SRCROOT
-sudo chown ubuntu:ubuntu $SRCROOT
+if [[ $(go version) == "go version go${GO_VERSION} linux/${ARCH}" ]]; then
+    echo "Go ${GO_VERSION} ${ARCH} already installed; Skipping"
+else
+    cd /tmp
+    wget -q https://storage.googleapis.com/golang/go${GO_VERSION}.linux-${ARCH}.tar.gz
+    tar -xf go${GO_VERSION}.linux-${ARCH}.tar.gz
+    sudo mv go $SRCROOT
+    sudo chmod 775 $SRCROOT
+    sudo chown ubuntu:ubuntu $SRCROOT
+fi
 
 # Setup the GOPATH; even though the shared folder spec gives the working
 # directory the right user/group, we need to set it properly on the
@@ -52,10 +58,14 @@ sudo chmod 0755 /etc/profile.d/gopath.sh
 source /etc/profile.d/gopath.sh
 
 # Install Docker
-echo deb https://apt.dockerproject.org/repo ubuntu-`lsb_release -c | awk '{print $2}'` main | sudo tee /etc/apt/sources.list.d/docker.list
-sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
-sudo apt-get update
-sudo apt-get install -y docker-engine
+if [[ -f /etc/apt/sources.list.d/docker.list ]]; then
+    echo "Docker repository already installed; Skipping"
+else
+    echo deb https://apt.dockerproject.org/repo ubuntu-`lsb_release -c | awk '{print $2}'` main | sudo tee /etc/apt/sources.list.d/docker.list
+    sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
+    sudo apt-get update
+fi
+sudo DEBIAN_FRONTEND=noninteractive apt-get install -y docker-engine
 
 # Restart docker to make sure we get the latest version of the daemon if there is an upgrade
 sudo service docker restart

scripts/install_consul.sh

 #!/bin/bash
 
-set -ex
+set -e
 
-CONSUL_VERSION="0.7.2"
+CONSUL_VERSION="0.7.3"
 CURDIR=`pwd`
 
+if [[ $(consul version | head -n 1 | cut -d ' ' -f 2) == "v$CONSUL_VERSION" ]]; then
+    echo "Consul v$CONSUL_VERSION already installed; Skipping"
+    exit
+fi
+
 echo Fetching Consul...
 cd /tmp/
-wget https://releases.hashicorp.com/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_amd64.zip -O consul.zip
+wget -q https://releases.hashicorp.com/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_amd64.zip -O consul.zip
 echo Installing Consul...
 unzip consul.zip
 sudo chmod +x consul

scripts/install_rkt.sh

 #!/bin/bash
 
-set -ex
+set -e
 
 RKT_VERSION="v1.18.0"
 CMD="cp"
@@ -14,7 +14,7 @@ if [ ! -d "rkt-${RKT_VERSION}" ]; then
     printf "rkt-%s/ doesn't exist\n" "${RKT_VERSION}"
     if [ ! -f "rkt-${RKT_VERSION}.tar.gz" ]; then
         printf "Fetching rkt-%s.tar.gz\n" "${RKT_VERSION}"
-        wget https://github.com/coreos/rkt/releases/download/$RKT_VERSION/rkt-$RKT_VERSION.tar.gz
+        wget -q https://github.com/coreos/rkt/releases/download/$RKT_VERSION/rkt-$RKT_VERSION.tar.gz
         tar xzvf rkt-$RKT_VERSION.tar.gz
     fi
 fi

scripts/install_rkt_vagrant.sh

 #!/bin/bash
-
-set -ex
+set -e
 
 # Configure rkt networking
 sudo mkdir -p /etc/rkt/net.d
-echo '{"name": "default", "type": "ptp", "ipMasq": false, "ipam": { "type": "host-local", "subnet": "172.16.28.0/24", "routes": [ { "dst": "0.0.0.0/0" } ] } }' | sudo tee -a /etc/rkt/net.d/99-network.conf
+if [[ -f /etc/rkt/net.d/99-network.conf ]]; then
+    echo "rkt network already configured; Skipping"
+    exit
+fi
+echo '{"name": "default", "type": "ptp", "ipMasq": false, "ipam": { "type": "host-local", "subnet": "172.16.28.0/24", "routes": [ { "dst": "0.0.0.0/0" } ] } }' | jq . | sudo tee -a /etc/rkt/net.d/99-network.conf
 

scripts/install_vault.sh

 #!/bin/bash
 
-set -ex
+set -e
 
-VAULT_VERSION="0.6.2"
+VAULT_VERSION="0.6.4"
 CURDIR=`pwd`
 
+if [[ $(vault version | cut -d ' ' -f 2) == "v$VAULT_VERSION" ]]; then
+    echo "Vault v$VAULT_VERSION already installed; Skipping"
+    exit
+fi
+
 echo Fetching Vault ${VAULT_VERSION}...
 cd /tmp/
-wget https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip -O vault.zip
+wget -q https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip -O vault.zip
 echo Installing Vault...
 unzip vault.zip
 sudo chmod +x vault