AppLink for iOS 9+ (Symlink app/data dir under Documents/App-link)

applink.m

//
//  applink.m
//  applink
//
//  Created by esterTion on 2018/3/25.
//  xcrun -sdk iphoneos clang -framework Foundation -arch arm64 applink.m -o applink
//
//  APT repo: https://repo.estertion.win/
//

#import <Foundation/Foundation.h>
#import <stdio.h>

int main (int argc, const char * argv[])
{

    @autoreleasepool
    {	
    	// create parent folder
        NSString*  appLinkDir = @"/User/Documents/App-link/App";
        NSString* dataLinkDir = @"/User/Documents/App-link/Data";
        NSFileManager* fileMgr = [NSFileManager defaultManager];
        BOOL result = [fileMgr createDirectoryAtPath:appLinkDir
                         withIntermediateDirectories:true
                                          attributes:@{NSFileOwnerAccountID:@501,NSFileGroupOwnerAccountID:@501}
                                               error:nil];
        if (!result) {
            NSLog(@"Unable to create folder");
            return 1;
        }
        result = [fileMgr createDirectoryAtPath:dataLinkDir
                    withIntermediateDirectories:true
                                     attributes:@{NSFileOwnerAccountID:@501,NSFileGroupOwnerAccountID:@501}
                                          error:nil];
        if (!result) {
            NSLog(@"Unable to create folder");
            return 1;
        }
        //empty old entry
        for (NSString* file in [fileMgr enumeratorAtPath:appLinkDir]) {
            [fileMgr removeItemAtPath:[appLinkDir stringByAppendingPathComponent:file] error:nil];
        }
        for (NSString* file in [fileMgr enumeratorAtPath:@"/User/Documents/App-link/Data"]) {
            [fileMgr removeItemAtPath:[dataLinkDir stringByAppendingPathComponent:file] error:nil];
        }
        
        //App symlink
        printf("\nlinking Bundle/Application\n\n");
        NSString* appContainerDir = @"/var/containers/Bundle/Application";
        NSArray* uuids = [fileMgr contentsOfDirectoryAtPath:appContainerDir error:nil];
        for (NSString* uuid in uuids) {
            NSString* appDir = [appContainerDir stringByAppendingPathComponent:uuid];
            NSDictionary* info = [NSDictionary dictionaryWithContentsOfFile:[appDir stringByAppendingPathComponent:@".com.apple.mobile_container_manager.metadata.plist"]];
            NSString* id = info[@"MCMMetadataIdentifier"];
            [fileMgr createSymbolicLinkAtPath:[appLinkDir stringByAppendingPathComponent:id] withDestinationPath:appDir error:nil];
            printf("%s\n", [id cStringUsingEncoding:NSUTF8StringEncoding]);
        }
        [fileMgr createFileAtPath:[appLinkDir stringByAppendingPathComponent:@"a"]
                         contents:nil
                       attributes:@{NSFileOwnerAccountID:@501,NSFileGroupOwnerAccountID:@501}];
        
        //Data symlink
        printf("\nlinking Data/Application\n\n");
        NSString* dataContainerDir = @"/var/mobile/Containers/Data/Application";
        uuids = [fileMgr contentsOfDirectoryAtPath:dataContainerDir error:nil];
        for (NSString* uuid in uuids) {
            NSString* dataDir = [dataContainerDir stringByAppendingPathComponent:uuid];
            NSDictionary* info = [NSDictionary dictionaryWithContentsOfFile:[dataDir stringByAppendingPathComponent:@".com.apple.mobile_container_manager.metadata.plist"]];
            NSString* id = info[@"MCMMetadataIdentifier"];
            [fileMgr createSymbolicLinkAtPath:[dataLinkDir stringByAppendingPathComponent:id] withDestinationPath:dataDir error:nil];
            printf("%s\n", [id cStringUsingEncoding:NSUTF8StringEncoding]);
        }
        [fileMgr createFileAtPath:[dataLinkDir stringByAppendingPathComponent:@"a"]
                         contents:nil
                       attributes:@{NSFileOwnerAccountID:@501,NSFileGroupOwnerAccountID:@501}];
    }
	return 0;
}