Copy copies src to dst like the cp command.

DirSize returns the accumulated size of all files in folder.

Check if a file or directory exists.

IsDir check if the path is a dir.

MkdirAll directory and all parents if not existing.

TempDir creates a temp dir in the virtual fs Took from afero.FS code and adapted.

TempFile creates a temp file in the virtual fs Took from afero.FS code and adapted.

WalkDirFs is the same as filepath.WalkDir but accepts a v1.Fs so it can be run on any v1.Fs type.