Mark Files in Directory with Do Not Backup Attribute

gistfile1.m

#include <sys/xattr.h>

- (NSInteger)markFilesInDirectoryAsDoNotBackup:(NSString *)path {
	NSFileManager *fileManager = [NSFileManager defaultManager];
	NSDirectoryEnumerator *directoryEnumerator = [fileManager enumeratorAtPath:path];
	NSString *filePath = nil;
	NSInteger count = 0;
	
	const char *attrName = "com.apple.MobileBackup";
	u_int8_t attrValue = 1;
	
	while (filePath = [directoryEnumerator nextObject]) {
		setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);

		count += 1;
	}
	
	return count;
}