vagrant: Stop provisioning VM if one step fails

Currently, if e.g., the build provisioning step of the development
Vagrant VM fails, vagrant continues with subsequent steps and ultimately
fails to install and start cilium. This commit updates the Vagrantfile
and associated scripts to fail early.

Signed-off-by: Paul Chaignon <paul@cilium.io>

Vagrantfile

@@ -32,6 +32,10 @@ END
 end
 
 $bootstrap = <<SCRIPT
+set -o errexit
+set -o nounset
+set -o pipefail
+
 echo "----------------------------------------------------------------"
 export PATH=/home/vagrant/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
 
@@ -53,12 +57,20 @@ mv bpf-map /usr/bin
 SCRIPT
 
 $build = <<SCRIPT
+set -o errexit
+set -o nounset
+set -o pipefail
+
 export PATH=/home/vagrant/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
 ~/go/src/github.com/cilium/cilium/common/build.sh
 rm -fr ~/go/bin/cilium*
 SCRIPT
 
 $install = <<SCRIPT
+set -o errexit
+set -o nounset
+set -o pipefail
+
 sudo -E make -C /home/vagrant/go/src/github.com/cilium/cilium/ install
 
 sudo mkdir -p /etc/sysconfig

contrib/vagrant/start.sh

@@ -93,7 +93,11 @@ function write_netcfg_header(){
     filename="${3}"
     cat <<EOF > "${filename}"
 #!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
 
+K8S=${K8S:-}
 if [ -n "${K8S}" ]; then
     export K8S="1"
 fi
@@ -175,8 +179,9 @@ function write_k8s_header(){
     filename="${2}"
     cat <<EOF > "${filename}"
 #!/usr/bin/env bash
-
-set -e
+set -o errexit
+set -o nounset
+set -o pipefail
 
 # K8s installation
 sudo apt-get -y install curl
@@ -254,6 +259,10 @@ EOF
 
     cat <<EOF > "${filename_2nd_half}"
 #!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
 # K8s installation 2nd half
 k8s_path="/home/vagrant/go/src/github.com/cilium/cilium/contrib/vagrant/scripts"
 export IPV6_EXT="${IPV6_EXT}"