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module Gitlab
module Kubernetes
class Helm
HELM_VERSION = '2.7.0'.freeze
NAMESPACE = 'gitlab-managed-apps'.freeze
INSTALL_DEPS = <<-EOS.freeze
set -eo pipefail
apk add -U ca-certificates openssl >/dev/null
wget -q -O - https://kubernetes-helm.storage.googleapis.com/helm-v${HELM_VERSION}-linux-amd64.tar.gz | tar zxC /tmp >/dev/null
mv /tmp/linux-amd64/helm /usr/bin/
EOS
InstallCommand = Struct.new(:name, :install_helm, :chart) do
def pod_name
"install-#{name}"
end
end
def initialize(kubeclient)
@kubeclient = kubeclient
@namespace = Namespace.new(NAMESPACE, kubeclient)
end
def install(command)
@namespace.ensure_exists!
@kubeclient.create_pod(pod_resource(command))
end
##
# Returns Pod phase
#
# https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-phase
#
# values: "Pending", "Running", "Succeeded", "Failed", "Unknown"
#
def installation_status(pod_name)
@kubeclient.get_pod(pod_name, @namespace.name).status.phase
end
def installation_log(pod_name)
@kubeclient.get_pod_log(pod_name, @namespace.name).body
end
def delete_installation_pod!(pod_name)
@kubeclient.delete_pod(pod_name, @namespace.name)
end
private
def pod_resource(command)
labels = { 'gitlab.org/action': 'install', 'gitlab.org/application': command.name }
metadata = { name: command.pod_name, namespace: @namespace.name, labels: labels }
container = {
name: 'helm',
image: 'alpine:3.6',
env: generate_pod_env(command),
command: %w(/bin/sh),
args: %w(-c $(COMMAND_SCRIPT))
}
spec = { containers: [container], restartPolicy: 'Never' }
::Kubeclient::Resource.new(metadata: metadata, spec: spec)
end
def generate_pod_env(command)
{
HELM_VERSION: HELM_VERSION,
TILLER_NAMESPACE: @namespace.name,
COMMAND_SCRIPT: generate_script(command)
}.map { |key, value| { name: key, value: value } }
end
def generate_script(command)
[
INSTALL_DEPS,
helm_init_command(command),
helm_install_command(command)
].join("\n")
end
def helm_init_command(command)
if command.install_helm
'helm init >/dev/null'
else
'helm init --client-only >/dev/null'
end
end
def helm_install_command(command)
return if command.chart.nil?
"helm install #{command.chart} --name #{command.name} --namespace #{@namespace.name} >/dev/null"
end
end
end
end
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