Store rustler template outside of priv/?

[evnu]

The templates are stored in rustler_mix/priv/templates. When rustler_mix is part of a deployed Erlang/Elixir release, the priv directory is usually copied as-is into the release, so the templates end up in a deployed location. Maybe we can move the templates into another directory and tell package/0 in Rustler.Mixfile to include that directory as well.

[hauleth]

AFAIK rustler Elixir library is compile time only, so you can add runtime: false to your dependency and it will not be included into the release.

[evnu]

I just tried that, but alas runtime: false does not (yet) work for a release, as Rustler.construct_load_data/2 is compiled into the module:

/tmp/test_rustler_mix/_build/dev/rel/test_rustler_mix/bin ./test_rustler_mix start_iex
=ERROR REPORT==== 17-Aug-2023::23:17:52.044812 ===
Error in process <0.585.0> with exit value:
{undef,[{'Elixir.Rustler',construct_load_data,[0,nil],[]},
        {'Elixir.RustlerMixTest',rustler_init,0,
                                 [{file,"lib/rustler_mix_test.ex"},{line,1}]},
        {init,'-run_on_load_handler/2-fun-0-',1,[]}]}

=CRASH REPORT==== 17-Aug-2023::23:17:52.045100 ===
  crasher:
    initial call: kernel:init/1
    pid: <0.584.0>
    registered_name: []
    exception exit: {on_load_function_failed,'Elixir.RustlerMixTest',
                        {undef,
                            [{'Elixir.Rustler',construct_load_data,[0,nil],[]},
                             {'Elixir.RustlerMixTest',rustler_init,0,
                                 [{file,"lib/rustler_mix_test.ex"},{line,1}]},
                             {init,'-run_on_load_handler/2-fun-0-',1,[]}]}}
      in function  init:run_on_load_handlers/0
      in call from kernel:init/1 (kernel.erl, line 227)
    ancestors: [kernel_sup,<0.577.0>]
    message_queue_len: 0
    messages: []
    links: [<0.579.0>]
    dictionary: []
    trap_exit: false
    status: running
    heap_size: 376
    stack_size: 28
    reductions: 145
  neighbours:

=SUPERVISOR REPORT==== 17-Aug-2023::23:17:52.045132 ===
    supervisor: {local,kernel_sup}
    errorContext: start_error
    reason: {on_load_function_failed,'Elixir.RustlerMixTest',
                {undef,
                    [{'Elixir.Rustler',construct_load_data,[0,nil],[]},
                     {'Elixir.RustlerMixTest',rustler_init,0,
                         [{file,"lib/rustler_mix_test.ex"},{line,1}]},
                     {init,'-run_on_load_handler/2-fun-0-',1,[]}]}}
    offender: [{pid,undefined},
               {id,on_load},
               {mfargs,{proc_lib,start_link,[kernel,init,[on_load]]}},
               {restart_type,transient},
               {significant,false},
               {shutdown,2000},
               {child_type,worker}]

=CRASH REPORT==== 17-Aug-2023::23:17:52.049175 ===
  crasher:
    initial call: application_master:init/4
    pid: <0.576.0>
    registered_name: []
    exception exit: {{shutdown,
                      {failed_to_start_child,on_load,
                       {on_load_function_failed,'Elixir.RustlerMixTest',
                        {undef,
                         [{'Elixir.Rustler',construct_load_data,[0,nil],[]},
                          {'Elixir.RustlerMixTest',rustler_init,0,
                           [{file,"lib/rustler_mix_test.ex"},{line,1}]},
                          {init,'-run_on_load_handler/2-fun-0-',1,[]}]}}}},
                     {kernel,start,[normal,[]]}}
      in function  application_master:init/4 (application_master.erl, line 142)
    ancestors: [<0.575.0>]
    message_queue_len: 1
    messages: [{'EXIT',<0.577.0>,normal}]
    links: [<0.575.0>,<0.574.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 610
    stack_size: 28
    reductions: 171
  neighbours:

=INFO REPORT==== 17-Aug-2023::23:17:52.049671 ===
    application: kernel
    exited: {{shutdown,
                 {failed_to_start_child,on_load,
                     {on_load_function_failed,'Elixir.RustlerMixTest',
                         {undef,
                             [{'Elixir.Rustler',construct_load_data,
                                  [0,nil],
                                  []},
                              {'Elixir.RustlerMixTest',rustler_init,0,
                                  [{file,"lib/rustler_mix_test.ex"},{line,1}]},
                              {init,'-run_on_load_handler/2-fun-0-',1,[]}]}}}},
             {kernel,start,[normal,[]]}}
    type: permanent

Kernel pid terminated (application_controller) ({application_start_failure,kernel,{{shutdown,{failed_to_start_child,on_load,{on_load_function_failed,'Elixir.RustlerMixTest',{undef,[{'Elixir.Rustler',construct_load_data,[0,nil],[]},{'Elixir.RustlerMixTest',rustler_init,0,[{file,"lib/rustler_mix_test.ex"},{line,1}]},{init,'-run_on_load_handler/2-fun-0-',1,[]}]}}}},{kernel,start,[normal,[]]}}})

I think it should be possible to do that before runtime though.