OSXFUSE : Do not allow Finder to download files to build icons?

Question

I'm building custom Cloud-based storage access solution on top of OSX FUSE. Everything works fine, however there is a problem with Finder, which tries to download all the files in folder to build file icons.

Does anyone know a good and reliable programmatical way (i.e. coded in my Cocoa application) of disallowing Finder of doing this? Code based on building .DS_Store files, or based on Finder code injection will also be a good solution.

Answer 1

There is one way to filter out finder callbacks. You can get a context from any FUSE delegate callback. From that context you can get app bundle id, which can be used to filter out calls from finder.

Finder should have bundle id "com.apple.finder"

But, for example, if you will try to archive something in your drive, finder will came with exact the same bundle id. So enabling such filtering will broke archiving, and probably something else.

BTW- "com.apple.appkit.xpc.openAndSavePanelService" open and save panel will also read files to build icons.

NSDictionary *context = [GMUserFileSystem currentContext];
pid_t pid = [context[kGMUserFileSystemContextProcessIDKey] intValue];

NSRunningApplication *appFromPid = [NSRunningApplication runningApplicationWithProcessIdentifier:pid];
NSString *bundleId = appFromPid.bundleIdentifier;