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nerves
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lib/nerves/package/artifact.ex
defmodule Nerves.Package.Artifact do
@moduledoc """
Package artifacts are the product of compiling a package with a
specific toolchain.
"""
@base_dir Path.expand("~/.nerves/artifacts")
@doc """
Get the artifact name
Requires the package and toolchain package to be supplied
"""
@spec name(Nerves.Package.t, Nerves.Package.t) :: String.t
def name(pkg, toolchain) do
target_tuple =
case pkg.type do
:toolchain ->
Nerves.Env.host_platform <> "-" <>
Nerves.Env.host_arch
_ ->
toolchain.config[:target_tuple]
|> to_string
end
"#{pkg.app}-#{pkg.version}.#{target_tuple}"
end
@doc """
Get the base dir for where an artifact for a package should be stored.
If a package is pulled in from hex, the base dir for an artifact will point
to the NERVES_ARTIFACT_DIR or if undefined, `~/.nerves/artifacts`
Packages which were obtained through other Mix SCM's such as path will
have a base_dir local to the package path
"""
@spec base_dir(Nerves.Package.t) :: String.t
def base_dir(pkg) do
case pkg.dep do
local when local in [:path, :project] ->
pkg.path
|> Path.join(".nerves/artifacts")
_ ->
System.get_env("NERVES_ARTIFACTS_DIR") || @base_dir
end
end
@doc """
The full path to the artifact
"""
@spec dir(Nerves.Package.t, Nerves.Package.t) :: String.t
def dir(pkg, toolchain) do
base_dir(pkg)
|> Path.join(name(pkg, toolchain))
|> protocol_vsn(pkg)
end
@doc """
Determines if an artifact exists at its artifact dir.
"""
@spec exists?(Nerves.Package.t, Nerves.Package.t) :: boolean
def exists?(pkg, toolchain) do
dir(pkg, toolchain)
|> File.dir?
end
@doc """
Determines the extension for an artifact based off its type.
Toolchains use xz compression
"""
@spec ext(Nerves.Package.t) :: String.t
def ext(%{type: :toolchain}), do: "tar.xz"
def ext(_), do: "tar.gz"
defp protocol_vsn(dir, pkg) do
if pkg.compiler == :nerves_package do
dir
else
build_path =
Mix.Project.build_path
|> Path.join("nerves")
|> Path.expand
case pkg.type do
:toolchain ->
Path.join(build_path, "toolchain")
:system ->
Path.join(build_path, "system")
type -> Mix.raise "Cannot determine artifact path for #{type}"
end
end
end
end