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nerves
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0.2.0
Craft and deploy bulletproof embedded software
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Files
lib/mix/tasks/nerves.artifact.get.ex
defmodule Mix.Tasks.Nerves.Artifact.Get do
use Mix.Task
alias Nerves.Artifact
alias Nerves.Artifact.{Cache, Resolver}
@moduledoc """
Fetch the artifacts from one of the artifact_sites
This task is typically called as part of the
Nerves.Bootstrap aliases during `mix deps.get`
You can also call into this task by calling
`mix nerves.deps.get`
## Examples
$ mix nerves.artifact.get
"""
@shortdoc "Nerves get artifacts"
@impl true
def run(opts) do
Mix.shell().info("Resolving Nerves artifacts...")
Nerves.Env.packages()
|> Enum.each(&get(&1.app, opts))
end
@doc false
def get(app, _opts) do
case Nerves.Env.package(app) do
%Nerves.Package{type: type} when type in [:toolchain_platform, :system_platform] ->
:noop
%Nerves.Package{} = pkg ->
# Check to see if the package path is set in the environment
if Nerves.Artifact.env_var?(pkg) do
path = System.get_env(Nerves.Artifact.env_var(pkg))
Nerves.Utils.Shell.success(" Env #{app}")
Nerves.Utils.Shell.success(" #{path}")
else
# Check the cache
case Artifact.Cache.get(pkg) do
nil ->
get_artifact(pkg)
_cache_path ->
Nerves.Utils.Shell.success(" Cached #{app}")
end
end
_ ->
Nerves.Utils.Shell.warn(" Skipping #{app}")
end
end
defp get_artifact(pkg) do
archive = Artifact.download_path(pkg)
Nerves.Utils.Shell.success(" Resolving #{pkg.app}")
with true <- File.exists?(archive),
:ok <- Nerves.Utils.File.validate(archive) do
Nerves.Utils.Shell.info(" => Trying #{archive}")
put_cache(pkg, archive)
else
_error ->
File.rm(archive)
resolvers = Artifact.expand_sites(pkg)
get_artifact(pkg, resolvers)
end
end
defp get_artifact(pkg, []), do: Nerves.Utils.Shell.warn(" Skipping #{pkg.app}")
defp get_artifact(pkg, resolvers) do
case Resolver.get(resolvers, pkg) do
{:ok, archive} ->
put_cache(pkg, archive)
{:error, reason} ->
Nerves.Utils.Shell.error(" => #{reason}")
end
end
defp put_cache(pkg, archive) do
checksum = Artifact.checksum(pkg)
if checksum == Nerves.Artifact.checksum(pkg) do
Cache.put(pkg, archive)
Nerves.Utils.Shell.success(" => Success")
:ok
else
Nerves.Utils.Shell.error(" => Error: Checksums do not match")
:error
end
end
end