问题

升级Xcode12之后，单测的target (ReadInJoyTests) 出现了报错：

error: Cycle inside ReadInJoyTests; building could produce unreliable results.
Cycle details:
→ Target 'ReadInJoyTests': CodeSign /Users/yoferzhang/Library/Developer/Xcode/DerivedData/QQMSFContact-gpvqexdcrtvrsdczqfqownxrezqo/Build/Products/Debug-iphonesimulator/QQ.app/EarlGrey.framework
○ That command depends on command in Target 'ReadInJoyTests': script phase “[CP] Copy Pods Resources”
○ Target 'ReadInJoyTests': CodeSign /Users/yoferzhang/Library/Developer/Xcode/DerivedData/QQMSFContact-gpvqexdcrtvrsdczqfqownxrezqo/Build/Products/Debug-iphonesimulator/QQ.app/EarlGrey.framework

解决方案，是要删除 ReadInJoyTests target 中 build phase 的 [CP] Copy Pods Resources 的 Output file lists

手动删除

image

手动清空后，pod install 后还是会生成。

脚本删除

考虑是否可以通过脚本删除。

删除方法

脚本删除可以分为以下几步：

1. 获取主工程的xcodeproj
2. 找到target ReadInJoyTests target
3. 找到build phase [CP] Copy Pods Resources
4. 保存project

删除的代码

require 'xcodeproj'

def delete_rij_tests_output_file_lists
    puts "===================> Start delete ReadInJoyTests Target [CP] Copy Pods Resources output file lists"

    project_path = './QQMSFContact.xcodeproj'
    project = Xcodeproj::Project.open(project_path)
    project.targets.each do |target|
        if target.name == "ReadInJoyTests"
            puts "===================> Find ReadInJoyTests Target"
            build_phase = target.build_phases.find { |bp| bp.display_name == '[CP] Copy Pods Resources' }

            puts "===================> Before delete, Output file lists:"
            puts build_phase.output_file_list_paths
            
            # 执行删除
            while build_phase.output_file_list_paths.length > 0
                build_phase.output_file_list_paths.pop()
            end
        end
    end

    # 保存工程文件
    project.save
    puts "===================> Finish delete ReadInJoyTests Target [CP] Copy Pods Resources output file lists"
end

删除时机

首先来看一下cocoapods的hook执行顺序

1. 终端执行命令pod install
2. 运行podfile 中的 ruby method
3. 执行hook pre_install
4. 执行 pod install 的行为，但此时修改内容还在内存的 installer 中，还未写入磁盘
5. 执行hook post_install ，同上还是未写入磁盘
6. 将installer修改部分写入磁盘

如果在 post_install 中执行 delete_rij_tests_output_file_lists ，那因为 post_install 内pod的修改还没写入磁盘，delete_rij_tests_output_file_lists 的修改，会被 post_install 之后pod写入磁盘而覆盖掉。导致删除失败。

调试发现，如果在第3步之前， output file paths 内容存在，则在post_install 中执行删除，就不会发生覆盖写入时重新生成 output file paths 。

也就是说可以在第3步之前，先通过脚本写入 path，欺骗cocoapods，path存在，这次 install 就不要生成path 做添加动作。然后在post_install 中执行删除逻辑，这样就解决了问题。

写入path的代码为：

def add_rij_tests_temp_output_file_list
    project_path = './QQMSFContact.xcodeproj'
    project = Xcodeproj::Project.open(project_path)
    project.targets.each do |target|
        if target.name == "ReadInJoyTests"
            puts "===================> Find ReadInJoyTests Target"
            build_phase = target.build_phases.find { |bp| bp.display_name == '[CP] Copy Pods Resources' }

            puts "===================> Before add, temp output file lists:"
            puts build_phase.output_file_list_paths
            
            list_path = '${PODS_ROOT}/Target Support Files/Pods-ReadInJoyTests/Pods-ReadInJoyTests-resources-${CONFIGURATION}-output-files.xcfilelist'
            # 添加路径
            if build_phase.output_file_list_paths.include?(list_path) == false
                build_phase.output_file_list_paths.push(list_path)
            end
        end
    end

    # 保存工程文件
    project.save
end

最后修改完成的podfile 为

# 省略上述两个method定义
post_install do |installer|
    # 省略...
  
  # 删除 ReadInJoyTests Target [CP] Copy Pods Resources output file lists
  delete_rij_tests_output_file_lists
end

# pod install之前添加一次，让 pod 认为已经有了path，pod install过程中就不会再新增了
add_rij_tests_temp_output_file_list

完整流程

最后来看完整的流程

1. 临时添加output file path，让cocoapods认为本次 install 无需做添加path的动作。
2. install 生成工程修改（不会添加path）
3. post_install 中再删除 output file path
4. pod将install 写入磁盘。

See Also

最后提供一个不用 xcodeproj 工具的删除方法

post_install do |installer|

  installer.aggregate_targets.each do |target|
    if target.name == "Pods-ReadInJoyTests"
      puts "==========> Find Pods-ReadInJoyTests:"
      project = target.user_project
      puts project
      project.targets.each do |sub_target|
        if sub_target.name =="ReadInJoyTests"
          puts "==========> Find ReadInJoyTests Target"
          build_phase = sub_target.build_ phases. find { |bp| bp.display_name == '[CP] Copy Pods Resources' }
          puts "==========> Before delete, Output file lists:"
          puts build_phase.output_file_list_paths
          
          #执行刪除
          build_phase.output_file_list_paths.pop( )
          puts"==========> After delete, Output file lists:"
          puts build_phase.output_file_list_paths
        end
      end
      project. save
    end
  end
end