Encountering the dreaded “resource fork, Finder information, or similar detritus not allowed” error while code signing in Xcode on macOS Monterey can bring your development process to a screeching halt. This cryptic message often appears when Xcode attempts to package your application for distribution, leaving developers puzzled and frustrated. Understanding the root cause of this error and implementing the right solutions can save you valuable time and get your project back on track. This article will delve into the intricacies of this code signing error, providing actionable steps to resolve it and prevent future occurrences.
Understanding Resource Forks and Finder Information
Before diving into solutions, it’s crucial to understand what “resource forks” and “Finder information” are. These are metadata remnants from older macOS file systems, often invisible in modern Finder windows. While largely obsolete, they can occasionally interfere with code signing processes, especially when dealing with files copied from older systems or downloaded from certain sources. Xcode’s code signing process is stringent, rejecting any files containing these metadata remnants to ensure the integrity and security of the final application package.
Think of it like packing a suitcase for a flight. Security checks are rigorous, and any prohibited items will prevent you from boarding. Similarly, Xcode’s code signing process acts as a gatekeeper, ensuring only clean, compliant files make it into the final application bundle.
According to a 2022 Stack Overflow developer survey, code signing issues are among the top reported challenges faced by macOS developers. This highlights the prevalence and impact of this seemingly small but significant error.
Cleaning Your Project Files
The primary solution to this error involves meticulously cleaning your project files to remove any lingering resource forks or Finder information. Several methods can achieve this, each with varying degrees of effectiveness.
- Using xattr: This command-line tool allows you to directly manipulate extended file attributes, including resource forks and Finder information. Open Terminal and navigate to your project directory. Then, run the command
xattr -cr .This command recursively removes extended attributes from all files and folders within your project. - Using zip: Compressing and decompressing your project folder can effectively strip out unwanted metadata. Create a zip archive of your project, then extract it to a new location. This process often eliminates the problematic resource forks and Finder information.
- Using a dedicated cleaning tool: Several third-party tools are specifically designed to remove extended file attributes. These tools often provide a graphical interface, making the process more user-friendly for developers less comfortable with the command line.
Remember to back up your project before attempting any cleaning methods to avoid potential data loss.
Preventing Future Occurrences
Once you’ve cleaned your project, it’s essential to prevent the reintroduction of these metadata remnants. Be mindful of where you source your project files and assets. Avoid copying files directly from older macOS systems or using outdated file transfer methods. Instead, utilize modern cloud storage services or file transfer protocols that don’t preserve resource forks and Finder information.
Integrating a cleaning step into your build process can also help prevent future issues. By automatically removing extended file attributes before code signing, you can ensure a consistent and error-free build process.
Alternative Solutions and Troubleshooting
If you’ve tried the above methods and still encounter the error, several alternative solutions and troubleshooting steps can be taken. Double-check that your code signing identity and provisioning profiles are correctly configured in Xcode. Outdated or mismatched certificates can sometimes trigger similar errors. Also, ensure your Xcode installation is up-to-date, as newer versions often include bug fixes and improvements to the code signing process. Learn more about troubleshooting code signing issues.
Examining the build logs in Xcode can provide valuable clues about the specific files causing the error. The logs often pinpoint the exact location of the problematic metadata, allowing for targeted cleaning. Additionally, online forums and developer communities can offer further assistance and insights into resolving complex code signing problems.
- Verify Code Signing Identity
- Update Xcode
Advanced Techniques and Considerations
For developers working with large or complex projects, implementing automated cleaning scripts or integrating dedicated cleaning tools into the build pipeline can significantly streamline the development process. This ensures consistent removal of unwanted metadata, preventing code signing errors from disrupting your workflow.
Furthermore, educating your team about resource forks and Finder information can prevent future issues. By understanding the underlying cause of the error, developers can proactively avoid introducing problematic files into the project.
- Automate Cleaning
- Educate Your Team
Infographic Placeholder: Visual representation of the code signing process and how resource forks interfere.
FAQ
Q: Why does this error only occur on macOS? A: Resource forks and Finder information are specific to older macOS file systems and are not present on other operating systems.
Successfully resolving the “resource fork, Finder information, or similar detritus not allowed” error is crucial for any macOS developer. By understanding the root cause and implementing the solutions outlined in this article, you can ensure a smooth and efficient code signing process, allowing you to focus on what matters most: building great applications. Explore further resources on code signing best practices and advanced troubleshooting techniques to deepen your understanding and prevent future occurrences. Consider implementing automated cleaning procedures to streamline your workflow and minimize interruptions. By taking these steps, you can conquer this common code signing hurdle and continue developing high-quality macOS applications.
Question & Answer :
Already tried : Code Sign Error on macOS Sierra, Xcode 8
Please see image showing error 
CodeSign /Users/gururajtallur/Library/Developer/Xcode/DerivedData/Flow-bkqjkvtmvjovpyepfjeyqmjpintj/Build/Products/Debug-iphoneos/Super\ Flow\ Flip.app cd "/Volumes/Development/Project/Top Best Games/19. Lets Flow/35/let's FLOW - source/proj.ios_mac" export CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin" Signing Identity: "iPhone Distribution: New Free Games (2CHN583K4J)" Provisioning Profile: "Super Flow Flipp AppStore" (c6c30d2a-1025-4a23-8d12-1863ff684a05) /usr/bin/codesign --force --sign E48B98966150110E55EAA9B149F731901A41B37F --entitlements /Users/gururajtallur/Library/Developer/Xcode/DerivedData/Flow-bkqjkvtmvjovpyepfjeyqmjpintj/Build/Intermediates/Flow.build/Debug-iphoneos/Super\ Flow\ Flip.build/Super\ Flow\ Flip.app.xcent --timestamp=none /Users/gururajtallur/Library/Developer/Xcode/DerivedData/Flow-bkqjkvtmvjovpyepfjeyqmjpintj/Build/Products/Debug-iphoneos/Super\ Flow\ Flip.app /Users/gururajtallur/Library/Developer/Xcode/DerivedData/Flow-bkqjkvtmvjovpyepfjeyqmjpintj/Build/Products/Debug-iphoneos/Super Flow Flip.app: resource fork, Finder information, or similar detritus not allowed Command /usr/bin/codesign failed with exit code 1
In Code Sign section its allowing me to select profile and certificate…but still giving error. 
How to fix this problem ?
Solution 1:
Apple Developer Website Answers above problem Here.
Execute below command in terminal : First goto projects root folder
xattr -cr <path_to_project_dir>
Clean Xcode and Re-build.
Solution 2:
Just go to project root directory and run this command xattr -cr .
xattr -cr .
Clean Xcode and Re-build.
Solution 3:
You can fix this problem by finding files which holds finder information.
In terminal, goto project root directory and execute
ls -alR@ . > kundapura.txt
This creates kundapura.txt in current directory. Now search for com.apple.FinderInfo and clear this attributes for all files. You can do it like this
xattr -c <filename>
Example: xattr -c guru.png
Once you clear all then code sign works. Clean Xcode and Re Build. Cheers
Solution 4: Inspired by Mark McCorkle’s Answer
In terminal, goto project’s root directory and execute one by one command
find . -type f -name '*.jpeg' -exec xattr -c {} \; find . -type f -name '*.jpg' -exec xattr -c {} \; find . -type f -name '*.png' -exec xattr -c {} \; find . -type f -name '*.json' -exec xattr -c {} \;
Clean Xcode and Re-build.
