CocoaPods was not able to update the `master` repo

遇到的问题

系统升级到OS X 10.10.1 + CocoaPods 0.34后遇到了下面的问题，之前是一切正常的：

[!] The use of implicit sources has been deprecated. To continue using all of the sources currently on your machine, add the following to the top of your Podfile:

source ‘https://github.com/CocoaPods/Specs.git'

[!] CocoaPods was not able to update the master repo. If this is an unexpected issue and persists you can inspect it running >pod repo update --verbose

解决思路

尝试1：重装CocoaPods，问题依旧

gem list --local | grep cocoapods

# 好几个，全部uninstall
gem uninstall cocoapods

gem install cocoapods

尝试2：清除CocoaPods缓存后重新pod setup，解决问题

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

原因分析

解决问题后再次搜索总是能得到正确答案:

I’m getting permission errors while running pod commands

简单来说就是0.32之后的CocoaPods repo目录访问现在不需要root权限了，之前版本生成的目录权限在新版本下会有权限问题，所以需要删除重新生成一次。