Mac系统下ruby更新和配置

文本记录于20200825

ruby安装的前提是要有rvm，rvm安装更新操作详见《Mac系统更新RVM到最新版本》

更新前记录：

系统版本：macOS Catalina（10.15.5）
ruby版本：2.6.3p62

$ ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]

但是查询已经安装的ruby时显示并没有安装：

$ rvm list

# No rvm rubies installed yet. Try 'rvm help install'.

那么想要把当前版本设为默认版本，执行命令也是不行：

$ rvm use 2.6.3 --default
Required ruby-2.6.3 is not installed.
To install do: 'rvm install "ruby-2.6.3"'

$ rvm use 2.6.3p62 --default
Required ruby-2.6.3p62 is not installed.
To install do: 'rvm install "ruby-2.6.3p62"'

两个都不行，我也不懂，反正不行。那就全部更新下到最新版本再说吧。

版本更新操作记录：

1.列出 Ruby 可安装的版本信息
$ rvm list known 
2.安装一个 Ruby 版本
$ rvm install 2.7.0
3.如果想设置为默认版本，可以用这条命令来完成
$ rvm use 2.7.0 --default

按步骤查看当前rvm可安装的ruby版本如下：

$ rvm list known
# MRI Rubies
[ruby-]1.8.6[-p420]
[ruby-]1.8.7[-head] # security released on head
[ruby-]1.9.1[-p431]
[ruby-]1.9.2[-p330]
[ruby-]1.9.3[-p551]
[ruby-]2.0.0[-p648]
[ruby-]2.1[.10]
[ruby-]2.2[.10]
[ruby-]2.3[.8]
[ruby-]2.4[.9]
[ruby-]2.5[.7]
[ruby-]2.6[.5]
[ruby-]2.7[.0]
ruby-head

# for forks use: rvm install ruby-head-<name> --url https://github.com/github/ruby.git --branch 2.2

.
.
.

# IronRuby
ironruby[-1.1.3]
ironruby-head

查看到最新版本ruby版本是2.7，那就装这个吧（时间贼久，装了将近1个钟头中间还发生失败过一次，执行原命令继续下载）：

$ rvm install 2.7 --default
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.15/x86_64/ruby-2.7.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Installing requirements for osx.
Updating system...........
Installing required packages: coreutils, libyaml, libksba, readline, zlib, openssl@1.1..............
Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/XXX/.rvm/rubies/ruby-2.7.0, this may take a while depending on your cpu(s)...
ruby-2.7.0 - #downloading ruby-2.7.0, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 98 14.0M   98 13.7M    0     0   8007      0  0:30:36  0:30:00  0:00:36 16102
Warning: Transient problem: timeout Will retry in 2 seconds. 3 retries left.
Throwing away 14413569 bytes
 58 14.0M   58 8366k    0     0   7310      0  0:33:31  0:19:32  0:13:59     0
curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
There was an error(56).
Checking fallback: https://ftp.ruby-lang.org/pub/ruby/2.7/ruby-2.7.0.tar.bz2
** Resuming transfer from byte position 8567699
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 50 5991k   50 3008k    0     0   4718      0  0:21:40  0:10:52  0:10:48     0
curl: (56) LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
There was an error(56).
Failed download
There has been an error fetching the ruby interpreter. Halting the installation.

$ rvm install 2.7
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.15/x86_64/ruby-2.7.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Certificates bundle '/usr/local/etc/openssl@1.1/cert.pem' is already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/XXX/.rvm/rubies/ruby-2.7.0, this may take a while depending on your cpu(s)...
ruby-2.7.0 - #downloading ruby-2.7.0, this may take a while depending on your connection...
** Resuming transfer from byte position 11648022
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:30 --:--:--     0
Warning: Transient problem: timeout Will retry in 2 seconds. 3 retries left.
100 2983k  100 2983k    0     0   5676      0  0:08:58  0:08:58 --:--:-- 11850
ruby-2.7.0 - #extracting ruby-2.7.0 to /Users/XXX/.rvm/src/ruby-2.7.0.....
ruby-2.7.0 - #configuring.........................................................................
ruby-2.7.0 - #post-configuration.
ruby-2.7.0 - #compiling.......................................................................................................|
ruby-2.7.0 - #installing............
ruby-2.7.0 - #making binaries executable...
Installed rubygems 3.1.2 is newer than 3.0.8 provided with installed ruby, skipping installation, use --force to force installation.
ruby-2.7.0 - #gemset created /Users/XXX/.rvm/gems/ruby-2.7.0@global
ruby-2.7.0 - #importing gemset /Users/XXX/.rvm/gemsets/global.gems.........................................................-
ruby-2.7.0 - #generating global wrappers.......
ruby-2.7.0 - #gemset created /Users/XXX/.rvm/gems/ruby-2.7.0
ruby-2.7.0 - #importing gemsetfile /Users/XXX/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.7.0 - #generating default wrappers.......
ruby-2.7.0 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.7.0 - #complete 
Ruby was built without documentation, to build it run: rvm docs generate-ri

更新命令执行结束，那么来看下ruby版本和安装信息：

$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]

$ rvm list
=* ruby-2.7.0 [ x86_64 ]

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

这就算是更新成功过了。