尝试使用分叉 gem 时 Gem::LoadError

Question

我的目标是使用 libmspack。这取决于 ffi-compiler，我已经分叉了 ffi-compiler，以添加一些自定义代码，并且我希望 libmspack 使用我的修改版本。我有一个简单的 Gemfile：

source 'http://rubygems.org'

gem 'ffi-compiler', :github =>'survili/ffi-compiler'
gem 'libmspack'

运行“bundle install”时，“ffi-compiler”的安装可以正常完成，但“libmspack”安装失败并显示找不到“ffi-compiler”的错误。（LoadError: cannot load such file -- ffi-compiler /编译任务）

我注意到如果我从 Gemfile 中删除“libmspack”，并尝试使用“bundle exec install libmspack”安装它，它工作正常。

有人可以解释一下，实现我的目标的正确方法是什么，导致 libmspack 使用自定义 ffi-compiler gem ？

我找到了这个 SO post，它提出了同样的问题，但没有答案：Gem::LoadError when using a git repo in Gemfile

先感谢您

------ 包的输出（使用 RVM 的空 gemset）-------

jackju at macbook-air  ~/tmp/delme1
$ rvm use 2.1.1@stackoverproblem --create
ruby-2.1.1 - #gemset created /home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem
ruby-2.1.1 - #generating stackoverproblem wrappers...........
Using /home/jackju/.rvm/gems/ruby-2.1.1 with gemset stackoverproblem
jackju at macbook-air  ~/tmp/delme1
$ rvm current
ruby-2.1.1@stackoverproblem
jackju at macbook-air  ~/tmp/delme1
$ vim Gemfile

[1]+  Stopped                 vim Gemfile
jackju at macbook-air  ~/tmp/delme1
$ rvm current
ruby-2.1.1@stackoverproblem
jackju at macbook-air  ~/tmp/delme1
$ gem list

*** LOCAL GEMS ***

bigdecimal (1.2.4)
bundler (1.5.3)
bundler-unload (1.0.2)
executable-hooks (1.3.1)
gem-wrappers (1.2.4)
io-console (0.4.2)
json (1.8.1)
minitest (4.7.5)
psych (2.0.3)
rake (10.1.0)
rdoc (4.1.0)
rubygems-bundler (1.4.2)
rvm (1.11.3.9)
test-unit (2.1.1.0)
jackju at macbook-air  ~/tmp/delme1
$ bundle
Fetching git://github.com/survili/ffi-compiler.git
remote: Reusing existing pack: 260, done.
remote: Counting objects: 5, done.
remote: Compressing objects: 100% (5/5), done.
remote: Total 265 (delta 2), reused 0 (delta 0)
Receiving objects: 100% (265/265), 38.59 KiB | 0 bytes/s, done.
Resolving deltas: 100% (116/116), done.
Fetching gem metadata from http://rubygems.org/.........
Fetching additional metadata from http://rubygems.org/..
Resolving dependencies...
Installing rake (10.3.1)
Installing ffi (1.9.3)
Using ffi-compiler (0.1.4) from git://github.com/survili/ffi-compiler.git (at master)

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/jackju/.rvm/rubies/ruby-2.1.1/bin/ruby -rubygems /home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/gems/rake-10.3.1/bin/rake RUBYARCHDIR=/home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/extensions/x86_64-linux/2.1.0/libmspack-0.0.4 RUBYLIBDIR=/home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/extensions/x86_64-linux/2.1.0/libmspack-0.0.4
rake aborted!
LoadError: cannot load such file -- ffi-compiler/compile_task
/home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/gems/libmspack-0.0.4/ext/Rakefile:1:in `<top (required)>'
(See full trace by running task with --trace)

rake failed, exit code 1

Gem files will remain installed in /home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/gems/libmspack-0.0.4 for inspection.
Results logged to /home/jackju/.rvm/gems/ruby-2.1.1@stackoverproblem/extensions/x86_64-linux/2.1.0/libmspack-0.0.4/gem_make.out
An error occurred while installing libmspack (0.0.4), and Bundler cannot
continue.
Make sure that `gem install libmspack -v '0.0.4'` succeeds before bundling.
jackju at macbook-air  ~/tmp/delme1
$ ls
Gemfile
jackju at macbook-air  ~/tmp/delme1
$ 

Answer 1

问题是缺少在此 gem 中找到的“rubygems/tasks”： https: //github.com/postmodern/rubygems-tasks。

我能够按照以下步骤在我的计算机上安装 libmspack：

1. gem 安装 ruby​​gems-tasks

2. git 克隆 git@github.com:survili/ffi-compiler.git

3. cd ffi 编译器

4. 耙子建造宝石

5. gem 安装 pkg/ffi-compiler-0.1.4.gem

6. gem 安装 libmspack -v '0.0.4'

Successfully installed libmspack-0.0.4 
1 gem installed