# 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
}