Erlang rebar3构建

Question

我正在构建一个基于“牛仔”的服务器，使用json处理。我遇到的问题是，在通过执行rebar3生成的二进制文件启动shell之后，只有“牛仔”才能像预期的那样工作，但我无法访问mnesia，这是OTP的一部分。另外，使用rebar3文件运行.config会产生以下输出：

>There are missing function calls in the release.
===> Make sure all applications needed at runtime are included in the release.
===> db_access:init_tables/0 calls undefined function **mnesia:create_table/2**
===> db_access:insert_apod_entries/1 calls undefined function **mnesia:transaction/1**
===> db_access:insert_apod_entries/1 calls undefined function **mnesia:write/1**

如果我通过发出'erl‘命令启动Erlang，那么mnesia是可用的。我已经包括了我正在使用的rebar.config。如果能在这个问题上提供任何帮助，我们将不胜感激。

%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 ft=erlang et

%% escript_incl_extra is for internal rebar-private use only.
%% Do not use outside rebar. Config interface is not stable.
{require_erts_vsn, ".*"}.
{require_otp_vsn, ".*"}.
{require_min_otp_vsn, ".*"}.


{escript_incl_extra, [{"priv/templates/*", "."}]}.
{include_src, false}.

{deps, [
    {jiffy, "1.1.1", "deps/"},
    {cowlib,"2.11.0", "deps/"},
    {cowboy, "2.9.0", "deps/"}
]}.

{erl_first_files, ["src/db_access.erl", 
                    "src/tar_watch_handler.erl",
                    "star_watch_server_app.erl",
                    "star_watch_server_sup.erl"
                    ]}.   

% {artifacts, ["/home/oleg/Projects/erlang_practice/star_watch_server/deps/jiffy/priv/jiffy.so"]}.
{plugins, [
    { pc, {git, "git@github.com:blt/port_compiler.git", {branch, "master"}}}
]}.
{overrides,
 [{override, jiffy, [
     {plugins, [pc]},
     {artifacts, ["priv/jiffy.so"]},
     {provider_hooks, [
         {post,
             [
             {compile, {pc, compile}},
             {clean, {pc, clean}}
             ]
          }]
      }
  ]}
]}.

{base_dir, "_build"}.
%% directory in '<base_dir>/<profile>/' where deps go
{deps_dir, "lib"}.
%% where rebar3 operates from; defaults to the current working directory
{root_dir, "."}.
%% where checkout dependencies are to be located
{checkouts_dir, "_checkouts"}.
%% where, under <base_dir>/<profile> checkout dependencies are to be built
{checkouts_out_dir, "checkouts"}.
%% directory in '<base_dir>/<profile>/' where plugins go
{plugins_dir, "plugins"}.
%% directories where OTP applications for the project can be located
{project_app_dirs, ["apps/*", "lib/*", "."]}.
%% Directories where source files for an OTP application can be found
{src_dirs, ["src"]}.
%% Paths to miscellaneous Erlang files to compile for an app
%% without including them in its modules list
{extra_src_dirs, []}.


%% Types dict:dict() and digraph:digraph() have been introduced in Erlang 17.
%% At the same time, their counterparts dict() and digraph() are to be
%% deprecated in Erlang 18. namespaced_types option is used to select proper
%% type name depending on the OTP version used.
{erl_opts,
 [
  {platform_define, "(linux|solaris|freebsd|darwin)", 'HAVE_SENDFILE'},
  {platform_define, "(linux|freebsd)", 'BACKLOG', 128},
  {platform_define, "R13", 'old_inets'},
  {src_dirs, ["src"]}
  ]}.

{minimum_otp_vsn, "25.0.4"}.
{application_resource_extensions, [
    ".app.src.script", ".app.src"
]}.

{cover_enabled, true}.
{validate_app_modules, true}.
{base_dir, "_build"}.
%% directory in '<base_dir>/<profile>/' where deps go
{deps_dir, "lib"}.
%% where rebar3 operates from; defaults to the current working directory
{root_dir, "."}.
%% where checkout dependencies are to be located
{checkouts_dir, "_checkouts"}.
%% where, under <base_dir>/<profile> checkout dependencies are to be built
{checkouts_out_dir, "checkouts"}.




{xref_checks, []}.
{xref_queries,
 [{"(XC - UC) || (XU - X - B
      - (\"escript\":\"foldl\"/\"3\")
      - (\"eunit_test\":\"function_wrapper\"/\"2\")
      - (\"eflame\":\"apply\"/\"5\")
      - (\"abnfc\":\"file\"/\"2\")
      - (\"erlydtl\":\"compile\"/\"3\")
      - (\"lfe_comp\":\"file\"/\"2\")
      - (\"neotoma\":\"file\"/\"2\")
      - (\"protobuffs_compile\":\"scan_file\"/\"2\")
      - (\"gpb_compile\":\"file\"/\"2\")
      - (\"gpb_compile\":\"format_error\"/\"1\")
      - (\"diameter_codegen\":\"from_dict\"/\"4\")
      - (\"diameter_dict_util\":\"format_error\"/\"1\")
      - (\"diameter_dict_util\":\"parse\"/\"2\")
      - (\"erlang\":\"timestamp\"/\"0\")
      - (\"rebar_rnd\":\"seed\"/\"1\")
      - (\"rebar_rnd\":\"uniform\"/\"0\"))",
         []}]}.

{dialyzer,
 [
  {plt_extra_apps, [diameter]},
  {warnings,
   [
    unmatched_returns,
    error_handling,
    race_conditions
   ]}
 ]}.

Answer 1

您需要将mnesia添加到应用程序的app.src文件中。

来自http://rebar3.org/docs/workflow/#setting-up-dependencies

如果您的应用程序在运行时需要依赖以使其工作(例如，您需要一个web服务器或直接调用库)，则将其添加到应用程序的.app.src文件({ application、stdlib、内核、.} tuple下)。

生成发行版(relx)的工具也使用相同的定义来确定发行版中包含哪些应用程序。