There’s a lot standing between your app and what it can edit and save: POSIX permissions, ACLs, SIP, TCC, and maybe the sandbox too.
permissions
Once, you could run diskutil to ‘fix’ broken permissions in your Home folder, then it was replaced by repairHomePermissions in Recovery. Apple no longer documents this, but it’s still there. Should you use it?
macOS now adds special permissions to standard folders including your Home folder, and its special folders inside it. This explains those ACLs and how to fix them.
We used to repair permissions of the system until SIP. After a short break, we often repaired them again, this time on preference files. Why did Apple cancel that? Should we still try it for fixing problems?
Explaining inodes, names, dates, permissions, file types, and specialised attributes used for iCloud.
How to store a 400 GB sparse bundle on a volume which only has 200 GB free space – provided that you don’t actually use the space that isn’t there.
Now runs native on Intel and Apple Silicon Macs. With a comparison of results between 10.15 and 11.0.
When nothing seems able to get that preference setting right, don’t abandon hope – follow this instead.
More file, folder and permissions magic courtesy of Catalina’s privacy system. How to tag a Photos library.
In the last few days, Apple has again changed its recommended procedure for resetting or repairing permissions on […]
The Eclectic Light Company 