Cocoapods错误: Failed to connect to GitHub to update the MacDownApp/cocoapods-specs specs repo

今天升级项目Cocoapods管理的第三方库, 用pod update --no-repo-update更新库,有的库的版本反而降低了(团队开发),这真的是莫名其妙. 然后用了pod install, pod install --no-repo-update, pod update, pod repo update等命令,都报以下这个错误:

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

这个问题跟 GitHub 有关系, 主要是 GitHub.com 删除了对弱密码标准的支持:
TLSv1/TLSv1.1, diffie-hellman-group1-sha1, diffie-hellman-group14-sha1
https://blog.github.com/2018-02-23-weak-cryptographic-standards-removed/

然后我在 stackoverflow 上找到了该问题的解决方案,亲测可用, 现把它搬运过来, 如下(侵删):

首先更新openssl,然后更新ruby,最后升级cocoapod。
$ 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

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