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12345678910111213141516171819defmodule GitSync.Tools do @moduledoc """ The external programs a sync shells out to.
A deployment that is missing one of these can do nothing useful, so the application refuses to start rather than failing every run with an unreadable `:enoent`. """
@required ~w(git sh ssh ssh-add ssh-agent ssh-keygen ssh-keyscan)
def check!(tools \\ @required) do case Enum.reject(tools, &System.find_executable/1) do [] -> :ok missing -> raise "not on PATH: #{Enum.join(missing, ", ")}" end endend