[!] CDN: trunk Repo update failed - 4 error(s):

最近升级Mac系统后使用 pod search 出现错误，内如如下：

coder_zyy@coder_zyydeMacBook-Pro ~ % pod search AFN
[!] CDN: trunk Repo update failed - 4 error(s):
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/4/e/7/FRDStravaClient/0.0.2/FRDStravaClient.podspec.json, error: Failed to open TCP connection to raw.githubusercontent.com:443 (Connection refused - connect(2) for "raw.githubusercontent.com" port 443)
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/4/e/7/FRDStravaClient/0.0.3/FRDStravaClient.podspec.json, error: Failed to open TCP connection to raw.githubusercontent.com:443 (Connection refused - connect(2) for "raw.githubusercontent.com" port 443)
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/4/e/7/FRDStravaClient/1.0.0/FRDStravaClient.podspec.json, error: Failed to open TCP connection to raw.githubusercontent.com:443 (Connection refused - connect(2) for "raw.githubusercontent.com" port 443)
CDN: trunk URL couldn't be downloaded: https://raw.githubusercontent.com/CocoaPods/Specs/master/Specs/4/e/7/FRDStravaClient/1.0.2/FRDStravaClient.podspec.json, error: Failed to open TCP connection to raw.githubusercontent.com:443 (Connection refused - connect(2) for "raw.githubusercontent.com" port 443)

CDN: trunk Repo update failed - x error(s):

按照官方文档在本地 podfile文件中添加source源：
source 'https://github.com/CocoaPods/Specs.git

添加source源后，pod install和pod update可以正常操作，但是pod search 却不正常

CocoaPods 1.8将CDN切换为默认的spec repo源，并附带一些增强功能！CDN支持最初是在1.7版本中引入的，最终在1.7.2中完成。 旨在大大加快初始设置和依赖性分析。

解决办法：

1.本地 podfile文件中添加source源：

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

2.查看本地pod版本并升级

coder_zyy@coder_zyydeMacBook-Pro ~ % pod --version        
1.8.4
coder_zyy@coder_zyydeMacBook-Pro ~ % pod repo update  
Updating spec repo `aliyun`
Updating spec repo `master`
  $ /usr/bin/git -C /Users/coder_zyy/.cocoapods/repos/master fetch origin
  --progress
  remote: Enumerating objects: 448, done.        
  remote: Counting objects: 100% (448/448), done.        
  remote: Compressing objects: 100% (82/82), done.        
  remote: Total 769 (delta 385), reused 365 (delta 365), pack-reused 321        
  Receiving objects: 100% (769/769), 90.75 KiB | 225.00 KiB/s, done.
  Resolving deltas: 100% (491/491), completed with 202 local objects.
  From https://github.com/CocoaPods/Specs
     85bd9b0e699..d28452c1911  master     -> origin/master
  $ /usr/bin/git -C /Users/coder_zyy/.cocoapods/repos/master rev-parse
  --abbrev-ref HEAD
  master
  $ /usr/bin/git -C /Users/coder_zyy/.cocoapods/repos/master reset --hard
  origin/master
  后面省略...

3.查看本地source列表

coder_zyy@coder_zyydeMacBook-Pro ~ % pod repo list        

aliyun
- Type: git (master)
- URL:  https://github.com/aliyun/aliyun-specs.git
- Path: /Users/coder_zyy/.cocoapods/repos/aliyun

master
- Type: git (master)
- URL:  https://github.com/CocoaPods/Specs.git
- Path: /Users/intest_zyy/.cocoapods/repos/master

moduleloveplay
- Type: git (master)
- URL:  https://github.com/ModuleLovePlay/PodSpec.git
- Path: /Users/coder_zyy/.cocoapods/repos/moduleloveplay

njhu
- Type: git (master)
- URL:  https://github.com/NJHu/NJSpecs.git
- Path: /Users/coder_zyy/.cocoapods/repos/njhu

trunk
- Type: CDN
- URL:  https://cdn.cocoapods.org/
- Path: /Users/coder_zyy/.cocoapods/repos/trunk

4 repos

4.执行pod repo remove trunk移除trunk源

coder_zyy@coder_zyydeMacBook-Pro ~ % pod repo remove trunk
Removing spec repo `trunk`

注意：podfile文件中一定要指定master源

因为CocoaPods 1.8版本现在默认是trunk源。

参考文章：

1. 官方说明（在谷歌浏览器中打开可自动翻译为天朝文）
2. Github Issules

文中如有总结不对、不到位的地方欢迎指出。谢谢~