rbnaclのΧ

gistfile2.txt

古いrails(4.2)のアプリケーションをDocker化したところ、rails sするとffi_libでsodiumが見つからないというエラー

bundle exec ruby -e "require 'rbnacl'"
Traceback (most recent call last):
	12: from -e:1:in `<main>'
	11: from -e:1:in `require'
	10: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl.rb:6:in `<top (required)>'
	 9: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl.rb:6:in `require'
	 8: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium/version.rb:6:in `<top (required)>'
	 7: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium/version.rb:7:in `<module:RbNaCl>'
	 6: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium/version.rb:9:in `<module:Sodium>'
	 5: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium/version.rb:13:in `<module:Version>'
	 4: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium/version.rb:13:in `extend'
	 3: from /usr/local/bundle/gems/rbnacl-4.0.2/lib/rbnacl/sodium.rb:14:in `extended'
	 2: from /usr/local/bundle/gems/ffi-1.9.18/lib/ffi/library.rb:100:in `ffi_lib'
	 1: from /usr/local/bundle/gems/ffi-1.9.18/lib/ffi/library.rb:100:in `map'
/usr/local/bundle/gems/ffi-1.9.18/lib/ffi/library.rb:147:in `block in ffi_lib': Could not open library 'sodium': sodium: cannot open shared object file: No such file or directory. (LoadError)
Could not open library 'libsodium.so': libsodium.so: cannot open shared object file: No such file or directory

root@8f64bd7077ce:/myapp# gem info rbnacl

*** LOCAL GEMS ***

rbnacl (4.0.2)
    Authors: Tony Arcieri, Jonathan Stott
    Homepage: https://github.com/cryptosphere/rbnacl
    License: MIT
    Installed at: /usr/local/bundle

    Ruby binding to the Networking and Cryptography (NaCl) library
root@8f64bd7077ce:/myapp# gem list rbnacl-libsodium

*** LOCAL GEMS ***

rbnacl-libsodium (1.0.11)
root@8f64bd7077ce:/myapp# gem info  rbnacl-libsodium

*** LOCAL GEMS ***

rbnacl-libsodium (1.0.11)
    Authors: Artiom Di, Tony Arcieri
    Homepage: https://github.com/cryptosphere/rbnacl-libsodium
    License: MIT
    Installed at: /usr/local/bundle

    rbnacl with bundled libsodium
    

FFI::DynamicLibrary.open(libname, lib_flags)
DEBUG1: DynamicLibary.open sodium, 1
DEBUG1: Exception Could not open library 'sodium': sodium: cannot open shared object file: No such file or directory
DEBUG1: DynamicLibary.open libsodium.so, 1
DEBUG1: Exception Could not open library 'libsodium.so': libsodium.so: cannot open shared object file: No such file or directory

Full path: /usr/local/bundle/gems/rbnacl-libsodium-1.0.11/vendor/libsodium/dist/lib/libsodium.so

これを指定すると動く

```
# encoding: binary
# frozen_string_literal: true

module RbNaCl
  # Defines the libsodium init function
  module Init
    extend FFI::Library
    if defined?(RBNACL_LIBSODIUM_GEM_LIB_PATH)
      ffi_lib RBNACL_LIBSODIUM_GEM_LIB_PATH
    else
      ffi_lib '/usr/local/bundle/gems/rbnacl-libsodium-1.0.11/vendor/libsodium/dist/lib/libsodium.so'
    end

    attach_function :sodium_init, [], :int
  end
end

```

RBNACL_LIBSODIUM_GEM_LIB_PATH これが指定されてないことが問題っぽい


/usr/local/bundle/gems/rbnacl-libsodium-1.0.11/lib/rbnacl/libsodium.rb
```
    ::RBNACL_LIBSODIUM_GEM_LIB_PATH = Dir.glob(File.join(sodiumlib_dir, sodiumlib_glob)).first
```

bundle exec ruby -e "require 'rbnacl/libsodium'"

これだとエラーでない！


bundlerがGemfileにのってるrbnaclを先にrequireしていることが問題！

```
  gem 'rbnacl', '>= 3.2.0'
  gem 'rbnacl-libsodium'
```
を
```
  gem 'rbnacl-libsodium'
```
しちゃう

    attach_function :sodium_init, [], :int