cocoapods 无法 升级 repo 无法执行pod install命令

　　首先MAC自带了ruby,他是用rvm 管理的， 如果你用homebrew又安装了一个新版，很可能在升级cocoapods时遇到问题，明明自己用homebrew升级到最新版本了，页配置环境变量了，为什么还是无法升级cocoapods?

　　因为系统默认还是用

要用到一个气泡显示器，用了git上面的一个第三方库

执行pod install 命令报错：

$ pod install

Analyzing dependencies

[!] Unable to satisfy the following requirements:

- `LFKit/Component/LFBubbleView` required by `Podfile`

None of your spec sources contain a spec satisfying the dependency: `LFKit/Component/LFBubbleView`.

You have either:

* out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.

* mistyped the name or version.

* not added the source repo that hosts the Podspec to your Podfile.

Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.

然后，我按照提示输入命令：

$pod update --verbose

Update all pods

Preparing

Updating local specs repositories

Updating spec repo `master`

[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down

后面还吐了一大堆，

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-core-1.3.1/lib/cocoapods-core/github.rb:105:in `rescue in modified_since_commit'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-core-1.3.1/lib/cocoapods-core/github.rb:100:in `modified_since_commit'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-core-1.3.1/lib/cocoapods-core/source.rb:445:in `unchanged_github_repo?'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-core-1.3.1/lib/cocoapods-core/source.rb:334:in `update'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/sources_manager.rb:88:in `block (2 levels) in update'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/user_interface.rb:64:in `section'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/sources_manager.rb:87:in `block in update'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/sources_manager.rb:86:in `each'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/sources_manager.rb:86:in `update'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:237:in `block in update_repositories'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:235:in `each'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer/analyzer.rb:235:in `update_repositories'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:150:in `block in resolve_dependencies'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/user_interface.rb:64:in `section'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:149:in `resolve_dependencies'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/installer.rb:116:in `install!'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/command/update.rb:81:in `run'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/lib/cocoapods/command.rb:52:in `run'

/Users/username/.rvm/gems/ruby-2.4.1@global/gems/cocoapods-1.3.1/bin/pod:55:in `<top (required)>'

/Users/username/.rvm/rubies/ruby-2.4.1/bin/pod:23:in `load'

/Users/username/.rvm/rubies/ruby-2.4.1/bin/pod:23:in `<main>'

主要意思是说，要么你网络有问题，要么是GitHub挂了。

pod update 命令执行不成功，自然无法更新最新的 cocoapods 库索引了。

从提示信息上看，我的ruby 是 2.4.1， cocoapods 版本是1.3.1，算是比较新的了。

最后发现是Github在不久之前的2018年2月23号移除了一些低加密标准协议，包括TLSv1/TLSv1.1，diffie-hellman-group1-sha1，diffie-hellman-group14-sha1，相关链接在这里：Weak cryptographic standards removed， 看GitHub的官方公告。

stackoverflow上已经有了解决方法：大致流程是：

$ which openssl
/usr/bin/openssl

$ openssl version
OpenSSL 0.9.8zh 14 Jan 2016

$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

$ brew update

$ brew install openssl

$ brew upgrade openssl

`` If you need to have this software first in your PATH run: echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

$ echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile
$ source ~/.bash_profile

$ which openssl
/usr/local/opt/openssl/bin/openssl

$ openssl version
OpenSSL 1.0.2n  7 Dec 2017

$ brew install rbenv ruby-build
//这里可能 会跟你自己安装ruby的方式冲突，请看文章最后， 建议用 rvm 就用rvm, 用rbenv 就卸载rvm 再安装 rbenv，二选一
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
$ echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bash_profile
$ source ~/.bash_profile

$ rbenv install --list

Available versions:
  1.8.5-p52
  1.8.5-p113
  1.8.5-p114
  1.8.5-p115
  1.8.5-p231
  1.8.6
:
  2.5.0-rc1
  2.5.0
  2.6.0-dev
:

$ rbenv install 2.5.0

$ rbenv versions
* system (set by /Users/username/.rbenv/version)
  2.5.0

$ ruby --version
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]

$ rbenv global 2.5.0

https://stackoverflow.com/questions/38993527/cocoapods-failed-to-connect-to-github-to-update-the-cocoapods-specs-specs-repo/48962041#48962041

但是我按照这些方法还是不行，原因可能是，我安装或升级pods时用的是 rvm管理的，再次升级安装，它会自动用用ruby 2.4.1 。而不会用brew安装的 2.5.1 。

使用命令：$ ruby --version

ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]

发现确实是  bash 引用的还是 ruby 2.4.1

最后我觉得应该把 rvm 管理的系统ruby升级：

可以使用rvm来更新管理ruby。
安装rvm

使用命令  $ curl -L http://get.rvm.io | bash -s stable
列出ruby可安装版本 rvm list known
安装一个需要的ruby版本 rvm install 2.5.0

 

之前openssl是用brew来安装的。

 

$ brew upgrade openssl

但是在

rvm install 2.5.0 命令执行过程中发现， 他自动 升级了homebrew， 然后升级了 openssl到1.1  总之，这个 github加密升级的东西是搞定了。

 

Updating Homebrew...

==> Upgrading 3 outdated packages, with result:

coreutils 8.28_1 -> 8.29, openssl@1.1 1.1.0f -> 1.1.0h, automake 1.15.1 -> 1.16.1

==> Upgrading openssl@1.1 

==> Downloading https://homebrew.bintray.com/bottles/openssl@1.1-1.1.0h.high_sie

######################################################################## 100.0%

==> Pouring openssl@1.1-1.1.0h.high_sierra.bottle.tar.gz

ruby 安装成功之后，

再执行 $pod repo update master --verbose  就可以升级索引库了。

看到绿字提示：

 

CocoaPods 1.5.0 is available.

To update use: `sudo gem install cocoapods`

For more information, see https://blog.cocoapods.org and the CHANGELOG for this version at https://github.com/CocoaPods/CocoaPods/releases/tag/1.5.0

证明升级成功。

最后可以发现，还是熟悉的味道，还是原来的配方：

$pod install 

 

Pod installation complete! There are 11 dependencies from the Podfile and 11 total pods installed.

还有一个问题， 在不同的 bash 命令里，假如在一个terminal里ruby没升级，另一个升级了，发现 $ruby --version 显示的ruby的不一样：

关于ruby 多版本的问题以后再做探讨，似乎有一个管理多版本ruby的第三方库。

给几个链接自己看看

https://www.cnblogs.com/supper-Ho/p/6414647.html 

https://www.v2ex.com/t/396846

从大家的讨论看出 用rvm会好点。 brew似乎会单独维护一个版本。

 

补充：

以上教程中使用了rbenv, 这个东西和rvm 是冲突的不能同时安装，请在使用前把rvm 卸载干净， 再安装rbenv。ruby-china社区里也有该方面的说明。

https://ruby-china.org/wiki/rbenv-guide

http://www.itkeyword.com/doc/127441560780079x670/how-to-use-rbenv-after-using-rvm