cocoapods升级失败的解决办法

今天使用cocoapods，看见提示我cocoapods更新的信息。

/usr/bin/pod install

Updating local specs repositories

CocoaPods 0.39.0 is available.
To update use: gem install cocoapods
Until we reach version 1.0 the features of CocoaPods can and will change.
We strongly recommend that you use the latest version at all times.

好的，那我们就来更新cocoapods

 ~ ⮀ gem install cocoapods
ERROR:  Could not find a valid gem 'cocoapods' (>= 0), here is why:
          Unable to download data from http://ruby.taobao.org/ - bad response Not Found 404 (http://ruby.taobao.org/specs.4.8.gz)

咦，我一直这么用的啊怎么不好用了？翻了翻cocoapods语法也没问题，仔细看看error，是不是淘宝的source不好用了，被删了？

上淘宝镜像一看

原来是升级到https了，那么就要更换ruby的source了。

 ~ ⮀ gem sources --remove http://ruby.taobao.org/
http://ruby.taobao.org/ removed from sources
 ~ ⮀ gem sources -a https://ruby.taobao.org/
https://ruby.taobao.org/ added to sources
 ~ ⮀ gem source -l
*** CURRENT SOURCES ***

https://ruby.taobao.org/

删掉旧的source，添加新的，然后升级gem，再升级cocoapods。

 ~ ⮀ sudo gem update --system
//结果太长省略
 ~ ⮀ sudo gem install cocoapods
//结果太长省略
 ~ ⮀ pod setup
Setting up CocoaPods master repo
Updating 0a4155d..0ce9f4a
Fast-forward
 .../0.0.4/CommonTableCollectView.podspec.json      | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Specs/CommonTableCollectView/0.0.4/CommonTableCollectView.podspec.json
From https://github.com/CocoaPods/Specs
   0a4155d..0ce9f4a  master     -> origin/master
Setup completed
 ~ ⮀ pod --version
0.39.0

还有就是安装cocoapods没有权限的时候，本来是$sudo gem install cocoapods ，但是显示没有权限，换成这句$sudo gem install -n /usr/local/bin cocoapods
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod
bogon:~ my$ sudo gem install -n /usr/local/bin cocoapods