Exrm(Elixir Release Manager)を使ったリリースでエラーが出た時の対処法

最近Elixirを勉強中だけど、ビルド周りで少しハマったのでメモ。

現象

Exrmを導入した状態で「mix release」コマンドを実行してElixirのアプリをビルドしようとしたところ、「(CaseClauseError) no case clause matching: :eacces」というエラーが発生した。

% MIX_ENV=prod mix release
　　：
** (CaseClauseError) no case clause matching: :eacces
    lib/exrm/utils/utils.ex:110: ReleaseManager.Utils.relx/5
    lib/mix/tasks/release.ex:339: anonymous fn/4 in Mix.Tasks.Release.do_release/1
    lib/ex_unit/capture_io.ex:146: ExUnit.CaptureIO.do_capture_io/2
    lib/ex_unit/capture_io.ex:119: ExUnit.CaptureIO.do_capture_io/3
    lib/mix/tasks/release.ex:338: Mix.Tasks.Release.do_release/1
    lib/mix/tasks/release.ex:78: Mix.Tasks.Release.do_run/1
    (mix) lib/mix/task.ex:294: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:58: Mix.CLI.run_task/2

対処法

調べたところ、とりあえずsudoをつけることで解決することが判明。
mix release fails with 'no case clause matching: :eacces' · Issue #401 · bitwalker/exrm · GitHub

% sudo  MIX_ENV=prod mix release
==> The release for sample-app-0.0.1 is ready!
==> You can boot a console running your release with `$ rel/sample-app/bin/sample-app console`

別の対処

Exrmの代わりにdistilleryを使う。
release.initが事前に必要になるが、sudoをわざわざ付ける必要はなくなる。

%  MIX_ENV=prod mix release.init

An example config file has been placed in rel/config.exs, review it,
make edits as needed/desired, and then run `mix release` to build the release

%  MIX_ENV=prod mix release
==> Assembling release..
==> Building release sample-app:0.0.1 using environment prod
==> Including ERTS 8.2.2 from /usr/local/Cellar/erlang/19.2.3/lib/erlang/erts-8.2.2
==> Packaging release..
==> Release successfully built!
    You can run it in one of the following ways:[f:id:matsnow:20170314011357p:plain]
      Interactive: _build/prod/rel/sample-app/bin/sample-app console
      Foreground: _build/prod/rel/sample-app/bin/sample-app foreground
      Daemon: _build/prod/rel/sample-app/bin/sample-app start