Hi,
while starting to implement a fs using python-fuse (https://gitlab.com/remarkable7735917/rmfs) and using the xmp example as a starting point I faced a problem: I did not want to use the current directory as 'state' for the filesystem to essentially pass around the "source-dir". That's easy within the fs itself: just add a class field and use that in all methods. However, things got complicated with file_class, but here is the more general question:
How can I pass information from an instance of a fuse-fs to the respective instances of file_class? This could be a user-specified mount-option which modifies how file_class would do things, or in the example of xmp it could be the source-dir (which directory to mirror).
The problem, as I see it, is: the class file_class is passed to python-fuse as-is and instantiated from there (not from an instance of fs). file_class does not have any information about which instance of the fs it is currently 'serving' nor what options given to that fs might be. I can reference the class of the fs from file_class, but I cannot reference the current instance which would hold the information I need. I also do not have a way to get to the instance of file_class from the instance of fs, especially not before file_class.init is called (where I most likely already need that info), because it is not fs instantiating file_class, but python-fuse.
My current workaround is to change file_class by adding a field (to the class) before passing that (modified) class to python-fuse, and then reading that class-field from the instance. That works. However, I feel this isn't clean: this information should not be stored at class-level but on instance-level. Another option could possibly be to pass the instance of the fs to file_class.init as well, so then the new instance of file_class can reference fields from the instance of fs it is used for. Yet another option could be to call the fs to instantiate file_class instead of doing that from within python-fuse: then fs could pass information to the new instance directly.
What is the currently preferred way to pass information from an instance of a fs to init of a new instance of file_class?
Hi,
while starting to implement a fs using python-fuse (https://gitlab.com/remarkable7735917/rmfs) and using the xmp example as a starting point I faced a problem: I did not want to use the current directory as 'state' for the filesystem to essentially pass around the "source-dir". That's easy within the fs itself: just add a class field and use that in all methods. However, things got complicated with file_class, but here is the more general question:
How can I pass information from an instance of a fuse-fs to the respective instances of file_class? This could be a user-specified mount-option which modifies how file_class would do things, or in the example of xmp it could be the source-dir (which directory to mirror).
The problem, as I see it, is: the class file_class is passed to python-fuse as-is and instantiated from there (not from an instance of fs). file_class does not have any information about which instance of the fs it is currently 'serving' nor what options given to that fs might be. I can reference the class of the fs from file_class, but I cannot reference the current instance which would hold the information I need. I also do not have a way to get to the instance of file_class from the instance of fs, especially not before file_class.init is called (where I most likely already need that info), because it is not fs instantiating file_class, but python-fuse.
My current workaround is to change file_class by adding a field (to the class) before passing that (modified) class to python-fuse, and then reading that class-field from the instance. That works. However, I feel this isn't clean: this information should not be stored at class-level but on instance-level. Another option could possibly be to pass the instance of the fs to file_class.init as well, so then the new instance of file_class can reference fields from the instance of fs it is used for. Yet another option could be to call the fs to instantiate file_class instead of doing that from within python-fuse: then fs could pass information to the new instance directly.
What is the currently preferred way to pass information from an instance of a fs to init of a new instance of file_class?