Add docker build support to omv.

This is a first go at having nicely integrated docker build support in
oh-my-vagrant. Place all your docker projects in the docker/
subdirectory, and they'll get built on each machine you bring up.

We don't run them, because this is probably better left to a tool like
atomic or kubernetes.

We build on each machine, instead of selectively building certain apps
on certain machines. We should probably add the ability to filter app
names in the omv.yaml file to only include certain ones on certain machines.

This all integrates consistently with the earlier extern support.

Sadly, this patch is missing the associated DOCUMENTATION.md changes.
I'll try and make up for this by publishing a blog post and/or
screencast soon :)

examples/docker-build.yaml

@@ -0,0 +1,26 @@
+---
+:domain: example.com
+:network: 192.168.123.0/24
+:image: centos-7.0-docker
+:boxurlprefix: ''
+:sync: rsync
+:folder: ''
+:extern:
+- type: git
+  system: docker
+  repository: https://github.com/purpleidea/docker-fakeapp1
+  directory: app1
+:puppet: false
+:classes: []
+:docker: []
+:ansible: []
+:playbook: []
+:cachier: false
+:vms: []
+:namespace: omv
+:count: 1
+:username: ''
+:password: ''
+:poolid: true
+:repos: []
+:reallyrm: false

vagrant/Vagrantfile

@@ -502,14 +502,17 @@ if load_folder
 	# what to call it. Suggestions welcome! It's not really 'playbooks' or
 	# 'roles' really, so it's 'modules' until something better comes along
 	ansible_basedir = File.join(projectdir, folder, 'ansible/', 'modules/')
+	docker_basedir = File.join(projectdir, folder, 'docker/')
 else
 	puppet_basedir = File.join(projectdir, 'puppet/', 'modules/')
 	ansible_basedir = File.join(projectdir, 'ansible/', 'modules/')
+	docker_basedir = File.join(projectdir, 'docker/')
 end
 
 native = []	# native files
 native += `cd "#{puppet_basedir}" && git ls-files`.strip.split("\n")
 native += `cd "#{ansible_basedir}" && git ls-files`.strip.split("\n")
+native += `cd "#{docker_basedir}" && git ls-files`.strip.split("\n")
 
 if extern.length > 0
 	extern.each do |i|
@@ -519,6 +522,8 @@ if extern.length > 0
 			basedir = puppet_basedir
 		elsif s == 'ansible'
 			basedir = ansible_basedir
+		elsif s == 'docker'
+			basedir = docker_basedir
 		else
 			$stderr.puts "Can't process extern system: '#{s}'."
 			next
@@ -569,7 +574,7 @@ if extern.length > 0
 end
 
 # clean up any directories or files that shouldn't be present
-(Dir.glob(puppet_basedir+'*')+Dir.glob(ansible_basedir+'*')).uniq.each do |i|
+(Dir.glob(puppet_basedir+'*')+Dir.glob(ansible_basedir+'*')+Dir.glob(docker_basedir+'*')).uniq.each do |i|
 	b = File.basename(i)
 	if not native.include?(b)
 		if really_use_rm
@@ -828,19 +833,25 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 				vm.vm.provision :docker, images: vm_docker.map { |y| y.fetch(:name, nil)}.compact
 			end
 
-			if vm_docker.is_a?(Array)
-				vm_docker.each do |y|
+			# docker build
+			if vm_docker	# for any value that is not false
+				Dir.glob(docker_basedir+'*').each do |dd|
+					if not File.directory?(dd)
+						next	# invalid, skip
+					end
+					# full Dockerfile path
+					df = File.join(dd, 'Dockerfile')
+					if not(File.exists?(df)) or File.directory?(df)
+						next	# invalid, skip
+					end
+					# app directory name containing Dockerfile
+					b = File.basename(dd)
 					vm.vm.provision :docker do |d|
-						# XXX y is now a hash to be used here...
+						# FIXME: this base dir shouldn't be /vagrant when using atomic hosts...
+						d.build_image "/vagrant/docker/#{b}", args: "-t #{b}"
+						#d.run "#{b}"	# use kube instead
 					end
 				end
-
-			elsif vm_docker
-				vm.vm.provision :docker do |d|
-					# XXX
-					#d.build_image '/vagrant/app'	# XXX: add a synced folder...
-					#d.run 'foo'	XXX
-				end
 			end
 
 			#

vagrant/docker/README

@@ -0,0 +1,2 @@
+Put your Docker app's in here! :)
+