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The Get Info box for an external hard drive shows "Custom" under Privileges in section Sharing & Permissions. Interestingly this is for groups with these names

  • com.apple.sharepoint.group.6
  • com.apple.sharepoint.group.5

Strange name and privileges

I have no idea how they were created, let alone what they are. Are these groups created as a result of any known process and what are these "Custom" privileges?

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What I found out is that the "Custom" privilege means that permissions have been configured in a way that are more complex than is provided and can be shown in the basic user settings of the Get Info window (namely: Read, Write, No Access).

If I query the volume in Terminal with ls -leda /Volumes/Some\ HD/ I get something like this. Option e is to print the ACL associated with the file (or directory), if present, in long (-l) output.

drwx------+ 18 Alex  staff  680  1 Oct 18:19 /Volumes/Some\ HD/
 0: group:com.apple.sharepoint.group.6 allow search
 1: group:com.apple.sharepoint.group.5 allow search
 2: D93ABBA3-3566-4A08-878E-B2E7C575B4A6 allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity

I just still don't know where the com.apple.sharepoint.group users are coming from and D93ABBA3-3566-4A08-878E-B2E7C575B4A6 looks a bit cryptic if that's me.

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