pod install报错问题解决的思路

1. 索引库

cocoaPods的本地仓库

cd ~/.cocoapods/repos
liqun@liqundeMacBook-Pro YiQiXiuCompany % pod repo list
EqxiuRepo
- Type: git (master)
- URL:  http://gitlab.yqxiu.cn/app-ios/eqxiurepo.git
- Path: /Users/liqun/.cocoapods/repos/EqxiuRepo

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

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

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

4 repos

pod说明书
找到Specs文件任意文件（索引文件），打开如下：
名称、项目版本、描述、项目位置、作者、系统、库tag（版本）、库路径、资源文件路径等

{
  "name": "CAIStatusBar",
  "version": "0.0.1",
  "summary": "A simple indicator",
  "homepage": "https://github.com/apple5566/CAIStatusBar.git",
  "license": "MIT",
  "authors": {
    "apple5566": "zaijiank110@sohu.com"
  },
  "platforms": {
    "ios": "6.0"
  },
  "source": {
    "git": "https://github.com/apple5566/CAIStatusBar.git",
    "tag": "0.0.1"
  },
  "source_files": "CAIStatusBar/**/*.{h,m}",
  "resources": "CAIStatusBar/CAIStatusBar.bundle",
  "requires_arc": true
}

2. pod install

cocoaPods根据索引库安装，继续以CAIStatusBar为例：
根据名称、tag值等索引文件信息确定安装的Pod库。

pod 'CAIStatusBar', '~> 0.0.1'

但如果找不到CAIStatusBar的索引文件，就会报各种错，别着急
了解现在最主要的工作是要找到索引文件，索引文件可能在不同的索引库中，刚开始就介绍了我的本地仓库：
一般trunk和master索引分支包含了99.99%的索引信息，所以如果存在这两个分支，pod install按理说一般没问题，其实不然，需要确定在哪个分支下下（source 源）。

liqun@liqundeMacBook-Pro YiQiXiuCompany % pod repo list
// 私有库
EqxiuRepo
- Type: git (master)
- URL:  http://gitlab.yqxiu.cn/app-ios/eqxiurepo.git
- Path: /Users/liqun/.cocoapods/repos/EqxiuRepo

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

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

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

4 repos

pod install 有个小技巧，如果确定pod 索引库在哪个分支（source）下，就只保留那个分支（source），进行pod install，pod 库也可以注释分布安装。如下：

source 'http://gitlab.yqxiu.cn/app-ios/eqxiurepo'
source 'https://cdn.cocoapods.org/'
source 'https://github.com/CocoaPods/Specs.git'

注：安装失败的好多时候是因为github.com网不好，如下总是失败，需要多次尝试

[!] Error installing GPUImage
[!] /usr/bin/git clone https://github.com/BradLarson/GPUImage.git /var/folders/j8/3nnb0qx12v73mcgqvj36zrxc0000gn/T/d20210625-33724-7bxom1 --template= --single-branch --depth 1 --branch 0.1.7

Cloning into '/var/folders/j8/3nnb0qx12v73mcgqvj36zrxc0000gn/T/d20210625-33724-7bxom1'...
fatal: unable to access 'https://github.com/BradLarson/GPUImage.git/': LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443 

要点总结：确定索引库的存在，找到对应源pod install。