Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offli

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

編譯環境

系統版本：macOS Sierra 10.12.6

Xcode: v9.2(9C40b)

當咱們使用pod update 或者 pod repo update 時，可能會出現 [!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down問題

一開始我認爲是網絡問題，後來頻繁的出現我發現是連接github出現了問題。
在stackoverflow 我找到了解決辦法。

在這裏能夠看到出現這個問題的緣由，以及解決的辦法

2018年2月以後，其中一個主要問題是「弱密碼標準被刪除」。

To solve this, first you need to update openssl, then ruby, then cocoapod.

開始搬運代碼

$ 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

$ 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

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

$ ruby --version
ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]

$ gem install cocoapods -n /usr/local/bin

$ which pod
/usr/local/bin/pod

$ pod --version
1.4.0

成功走到最後，則表明安裝成功了，能夠放心的pod update 和 pod repo update了

Ruby選擇的版本必須是大於2.0.0版本，最好是選擇最新的例如 2.5.0 或者 2.5.1

在 2018.4.24你pod可能更新的是1.5.0版本，這個關係不大

還有一種解決方案 是每次須要更新你的repo時，將老版本的repo刪除，從新下載

$sudo rm -fr ~/.cocoapods/repos/master
$pod setup
$pod install