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phoenix

0.13.1
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Security advisory: This version has known vulnerabilities. View advisories
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phoenix lib phoenix endpoint watcher.ex
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lib/phoenix/endpoint/watcher.ex 

defmodule Phoenix.Endpoint.Watcher do

  @moduledoc false

  require Logger



  def start_link(root, cmd, args) do

    Task.start_link(__MODULE__, :watch, [root, to_string(cmd), args])

  end



  def watch(root, cmd, args) do

    if exists?(cmd) do

      System.cmd(cmd, args, into: IO.stream(:stdio, :line),

                 stderr_to_stdout: true, cd: root)

    else

      relative = Path.relative_to_cwd(cmd)

      Logger.error "Could not start watcher #{inspect relative}, executable does not exist"

      exit(:shutdown)

    end

  end



  defp exists?(cmd) do

    if Path.type(cmd) == :absolute do

      File.exists?(cmd)

    else

      !!System.find_executable(cmd)

    end

  end

end