Kill inotifywait when BEAM process exits and stop leaks (#39)

lib/file_system/backends/fs_inotify.ex

@@ -106,9 +106,10 @@ defmodule FileSystem.Backends.FSInotify do
     {worker_pid, rest} = Keyword.pop(args, :worker_pid)
     case parse_options(rest) do
       {:ok, port_args} ->
+        bash_args = ['-c', to_charlist(executable_path()) ++ ' $0 $@ & PID=$!; read a; kill $PID']
         port = Port.open(
-          {:spawn_executable, to_charlist(executable_path())},
-          [:stream, :exit_status, {:line, 16384}, {:args, port_args}, {:cd, System.tmp_dir!()}]
+          {:spawn_executable, '/bin/sh'},
+          [:stream, :exit_status, {:line, 16384}, {:args, bash_args ++ port_args}, {:cd, System.tmp_dir!()}]
         )
         Process.link(port)
         Process.flag(:trap_exit, true)

test/backends/fs_inotify_test.exs

@@ -24,7 +24,7 @@ defmodule FileSystem.Backends.FSInotifyTest do
       assert {:ok, ['-e', 'modify', '-e', 'close_write', '-e', 'moved_to', '-e', 'create', '-e',
                     'delete', '-e', 'attrib', '--format', [37, 119, 1, 37, 101, 1, 37, 102],
                     '--quiet', '-m', '/tmp']} ==
-        parse_options(dirs: ["/tmp"], recursive: false, unsuppported: :options)
+        parse_options(dirs: ["/tmp"], recursive: false, unsupported: :options)
     end
   end