在 shell 脚本中执行命令时，无法通过 RVM 永久影响 Linux 环境中的活动 Ruby 版本

Question

所以在今晚的大部分时间里，我一直在努力编写一个 bash 脚本，以帮助简化/自动化/引导（无论您想怎么称呼它）我的开发环境，从从头开始。

我正在以模块化方式编写脚本，即编写完全自包含的小脚本，这些小脚本独立于较大的整体脚本运行，然后将其集成到脚本流中。

我正在使用的当前 scriptlet 与交互式更改活动 Ruby 版本有关，如果您要安装的版本已经存在，如果您想要的版本不存在，它将安装并将其设置为活动版本。

这主要是对整个过程的增强，对脚本本身一点也不重要，但是是一个非常大的“很高兴拥有”

至于我在准备编写这个功能时已经做了什么：

1. 将我的终端设置为接受 shell 登录 (Linux Mint 17.1)
2. 添加了源 $HOME/.rvm/scripts/rvm 以使 rvm 在脚本中作为函数运行

首先我将粘贴我测试代码的输出日志，然后我将粘贴脚本代码本身。注意：$crver 只是我创建的一个环境变量，它指向可执行脚本以节省输入时间。

安装新版本的 Ruby：

gabrial@thinkpad ~ $ $crver

rvm rubies

=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

Is the version of Ruby you wish to use listed above? (Y/N) n
Enter the Ruby version to install (ex: 2.2.2), followed by [ENTER]: 2.2.1
Searching for binary rubies, this might take some time.
No binary rubies available for: mint/17.1/x86_64/ruby-2.2.1.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for mint.
Requirements installation successful.
Installing Ruby from source to: /home/gabrial/.rvm/rubies/ruby-2.2.1, this may take a while depending on your cpu(s)...
ruby-2.2.1 - #downloading ruby-2.2.1, this may take a while depending on your connection...
ruby-2.2.1 - #extracting ruby-2.2.1 to /home/gabrial/.rvm/src/ruby-2.2.1....
ruby-2.2.1 - #applying patch /home/gabrial/.rvm/patches/ruby/2.2.1/fix_installing_bundled_gems.patch.
ruby-2.2.1 - #configuring.........................................................
ruby-2.2.1 - #post-configuration..
ruby-2.2.1 - #compiling...............................................................................
ruby-2.2.1 - #installing.............................
ruby-2.2.1 - #making binaries executable..
ruby-2.2.1 - #downloading rubygems-2.4.6
ruby-2.2.1 - #extracting rubygems-2.4.6.....
ruby-2.2.1 - #removing old rubygems.........
ruby-2.2.1 - #installing rubygems-2.4.6.....................
ruby-2.2.1 - #gemset created /home/gabrial/.rvm/gems/ruby-2.2.1@global
ruby-2.2.1 - #importing gemset /home/gabrial/.rvm/gemsets/global.gems...............................................
ruby-2.2.1 - #generating global wrappers........
ruby-2.2.1 - #gemset created /home/gabrial/.rvm/gems/ruby-2.2.1
ruby-2.2.1 - #importing gemsetfile /home/gabrial/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.2.1 - #generating default wrappers........
ruby-2.2.1 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.2.1 - #complete 
Ruby was built without documentation, to build it run: rvm docs generate-ri
Using /home/gabrial/.rvm/gems/ruby-2.2.1
gabrial@thinkpad ~ $ rvm list

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

使用预先存在的 Ruby 版本并将其设置为活动状态：

gabrial@thinkpad ~ $ $crver

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

Is the version of Ruby you wish to use listed above? (Y/N) y
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1
Using /home/gabrial/.rvm/gems/ruby-2.2.1
gabrial@thinkpad ~ $ rvm list

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

如您所见，在脚本中验证将 Ruby 的版本设置为 2.2.1，但在实际环境中，仍为 2.2.2

奇怪的是，我还尝试使用rvm use $rubyver --default 来部分成功。当直接从命令行运行 rvm list 时，它会显示默认版本的预期符号，但 Ruby 的活动版本保持不变：

gabrial@thinkpad ~ $ $crver

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

Is the version of Ruby you wish to use listed above? (Y/N) y
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1
Using /home/gabrial/.rvm/gems/ruby-2.2.1
gabrial@thinkpad ~ $ rvm list

rvm rubies

 * ruby-2.2.1 [ x86_64 ]
=> ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

这是脚本本身的代码块：

#!/bin/bash
source $HOME/.rvm/scripts/rvm

rvmexec() {
    msg="Enter the Ruby version to $1 (ex: 2.2.2), followed by [ENTER]: "
    case $1 in
        [use]* )
            read -p "$msg" rubyver
            eval rvm use $rubyver
            unset rubyver;
            break;;
        [install]* )
            read -p "$msg" rubyver
            eval rvm install $rubyver && rvm use $rubyver
            unset rubyver;
            break;;
    esac
}

rvm list
    while true; do
        read -p "Is the version of Ruby you wish to use listed above? (Y/N) " rubyverexist
        case $rubyverexist in
            [Yy]* ) rvmexec use; break;;
            [Nn]* ) rvmexec install; break;;
            * ) echo -e "\nERROR: Please enter a valid response\n";;
        esac
    done

任何帮助将不胜感激，如果我遗漏了任何重要内容，请提前原谅我，现在是凌晨 1 点 13 分，早上 6 点开始工作:)

干杯！

Answer 1

好吧，经过一番新的审视和 Google 搜索，我发现我所要做的就是在 var（现在是别名）前面加上 source，然后脚本就会按预期运行：

From ~/.profile:
alias crver="source $HOME/workspace/crver.sh"

--- Output Begins ---

gabrial@thinkpad ~ $ rvm list

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

gabrial@thinkpad ~ $ crver

rvm rubies

   ruby-2.2.1 [ x86_64 ]
=* ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

Is the version of Ruby you wish to use listed above? (Y/N) y
Enter the Ruby version to use (ex: 2.2.2), followed by [ENTER]: 2.2.1
Using /home/gabrial/.rvm/gems/ruby-2.2.1
gabrial@thinkpad ~ $ rvm list

rvm rubies

=* ruby-2.2.1 [ x86_64 ]
   ruby-2.2.2 [ x86_64 ]

# => - current
# =* - current && default
#  * - default

耶！

~鳍