update_docker_image.ps1.erb
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update_docker_image.ps1.erb
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	# Pulls a docker image.
	# Returns 0 if there a change.
	# Returns 2 if there is no change.
	# Returns 3 if something when wrong.
	#

	param
	(
	[string]$DockerImage
	)

	Write-Information "Before - Looking for image"
	$before=$(& <%= @docker_command %> inspect --type image --format='{{.Id}}' ${DockerImage} 2>$null)
	Write-Information "Pulling image"
	& <%= @docker_command %> pull ${DockerImage}
	Write-Information "Inspecting image"
	$after=$(& <%= @docker_command %> inspect --type image --format='{{.Id}}' ${DockerImage} 2>$null)
	If (!$after) {
	Write-Information "Docker image ${DockerImage} failed to pull!"
	Exit 3
	} ElseIf ($after -eq $before) {
	Write-Information "No updates to ${DockerImage} available. Currently on ${after}."
	Exit 2
	} Else {
	Write-Information "${DockerImage} updated. Changed from ${before} to ${after}."
	Exit 0
	}