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4.5.1. rebar3整体说明

// 命令:
rebar3 new <template> <project-name>
// 参数:
<template>:
  1.app
  2.lib
  3.release
  4.escript
  5.plugin
// 实例:
$ rebar3 new release myrelease

Erlang项目分为两种类型:

1.single app、lib类型:
rebar3 new app <name>
rebar3 new lib <name>
src在顶级目录
2.project app类型:
rebar3 new release <name>
lib、apps目录在顶级目录

依赖相关:

deps默认目录:
_build/default/lib
test默认目录:
_build/test/lib

//查看依赖树
$ rebar3 tree
//查看依赖
$ rebar3 deps

依赖从顶层向下clone，下层依赖不能overwrite上层依赖，最终依赖会写入rebar.lock中
{deps_error_on_conflict, true}. // 增加这句，依赖有冲突时，会中止

//包管理依赖:Package Manager Dependencies
//类似其他composer,npm之类
//地址:~/.cache/rebar3/hex/default/packages
//用下面这行可以换代理、镜像
{rebar_packages_cdn, "https://hexpm.upyun.com"}.

$ rebar3 unlock <app>

// 各种依赖类型
{deps,[
  %% Packages
  rebar,
  {rebar,"1.0.0"},
  {rebar, {pkg, rebar_fork}}, % rebar app under a different pkg name
  {rebar, "1.0.0", {pkg, rebar_fork}},
  %% Source Dependencies
  {rebar, {git, "git://github.com/erlang/rebar3.git"}},
  {rebar, {git, "http://github.com/erlang/rebar3.git"}},
  {rebar, {git, "https://github.com/erlang/rebar3.git"}},
  {rebar, {git, "git@github.com:erlang/rebar3.git"}},
  {rebar, {hg, "https://othersite.com/erlang/rebar3"}},
  {rebar, {git, "git://github.com/erlang/rebar3.git", {ref, "aef728"}}},
  {rebar, {git, "git://github.com/erlang/rebar3.git", {branch, "master"}}},
  {rebar, {git, "git://github.com/erlang/rebar3.git", {tag, "3.0.0"}}},
  %% Legacy support -- added parts such as [raw] are ignored
  {rebar, "3.*", {git,"git://github.com/erlang/rebar3.git"}},
  {rebar, {git, "git://github.com/erlang/rebar3.git"}, [raw]},
  {rebar, "3.*", {git, "git://github.com/erlang/rebar3.git"}, [raw]}
]}.

配置文件:

{deps, [...]}.
{relx, [
    ...
]}.

{profiles, [
    {prod, [
        {erl_opts, [no_debug_info, warnings_as_errors]},
        {relx, [{dev_mode, false}]}
    ]},
    {native, [
        {erl_opts, [{native, o3}]}
    ]},
    {test, [
        {deps, [meck]},
        {erl_opts, [debug_info]}
    ]}
]}.

// 上面实例中有4distinct profiles，分别为:
1.default; 2.prod; 3.native; 4.test
// 实例:
$rebar3 ct:
  default->test
$rebar3 as test ct:
  default->test
$rebar3 as native ct:
  default->native->test
$rebar3 as test,native ct:
  default->native->test（因为:幂等性）
$rebar3 release:
  default
$rebar3 as prod release
  default->prod->release
$rebar3 as prod, native release
  与上相同,只是compiling modules to native mode

// The order of application of profiles is therefore:
1.default
2.The REBAR_PROFILE value, if any
3.the profiles specified in the as part of the command line
4.the profiles specified by each individual command

releases相关:

//命令:
$ rebar release
// release项目下有多个app时，使用-n指定
$ rebar3 release -n <release_name>

// 配置文件:
{relx, [
  {
    release,
    {<release name>, "0.0.1"},
    [<app>]
  },
  {
    release,
    {<release name2>, "0.0.1"},
    [<app>]
  },
  {dev_mode, true},  // 开发模式，自动编译？
  {include_erts, false},
  {extended_start_script, true}
]}.

Overlays

配置:

{relx, [
    ...
    {overlay_vars, "vars.config"},
    {overlay, [{mkdir, "log/sasl"},
               {template, "priv/app.config", "etc/app.config"},
               {copy, "Procfile", "Procfile"}]}
]}.

选项:

mkdir:    在release目录「_build/default/rel/xxx」中创建目录
copy:     copy文件到目录「_build/default/rel/xxx」中
template: 同copy(只是可扩展)

配置:

{overlay_vars, "vars.config"}

$> cat vars.config:
%% some variables
{key, value}.
{other_key, other_val}.
%% includes variables from another file
"./some_file.config".

动态配置:

$ cat vm.args
-name ${NODE_NAME}
$ cat sys.config
[
 {appname, [{port, "${PORT}"}]}
].
$ cat xxx.sh   //借助shell命令启动多个application
#!/bin/bash

export RELX_REPLACE_OS_VARS=true

for i in `seq 1 10`;
do
    NODE_NAME=node_$i
    PORT=808$i
    _build/default/rel/<release>/bin/<release> foreground &
    sleep 1

Overlay相关:

{relx, [
    ...
    {overlay_vars, "vars.config"},
    {overlay, [{mkdir, "log/sasl"},
               {template, "priv/app.config", "etc/app.config"},
               {copy, "Procfile", "Procfile"}]}
]}.
//注(语法格式):https://github.com/soranoba/mustache

// overlay_vars里面的文件格式如下:
%% some variables
{key, value}.
{other_key, other_val}.
%% includes variables from another file
"./some_file.config".

// overlay支持的命令
mkdir
template
copy

// overlay_vars里面variables有:
log : The current log level in the format of (<logname>:<loglevel>)
output_dir : The current output directory for the built release
target_dir : The same as output_dir, exists for backwards compatibility
overridden : The current list of overridden apps (a list of app names)
goals : The list of user specified goals in the system
lib_dirs : The list of library directories, both user specified and derived
config_file : The list of config file used in the system
providers : The list of provider names used for this run of relx
sys_config : The location of the sys config file
root_dir : The root dir of the current project
default_release_name : The current default release name for the relx run
default_release_version : The current default release version for the relx run
default_release : The current default release for the relx run
release_erts_version : The version of the Erlang Runtime System in use
erts_vsn : The same as release_erts_version (for backwards compatibility)
release_name : The currently executing release
release_version : the currently executing version
rel_vsn : Same as release_version. Exists for backwards compatibility
release_applications : A list of applications included in the release

实例:

// 文件base.config
{data_dir, "/data/yolo_app"}.
{version, "1.0.0"}.
{run_user, "root"}.

// 文件dev.config
%% Include the base config
"./base.config".
%% The build we have
{build, "dev"}.

// 文件prod.config
%% Include the base config
"./base.config".
%% The build we have
{build, "prod"}.

Hooks:

{extended_start_script_hooks, [
  {pre_start, [{custom, "hooks/pre_start"}]},
  {post_start, [
    {pid, "/tmp/foo.pid"},
    {wait_for_process, some_process},
    {custom, "hooks/post_start"}
  ]},
  {pre_stop, [
    {custom, "hooks/pre_stop"}]},
    {post_stop, [{custom, "hooks/post_stop"}]},
  ]},
  {post_stop, [{custom, "hooks/post_stop"}]}
]}.

Extensions:

% start script extensions
{extended_start_script_extensions, [
   {status, "extensions/status"}
]}.

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