The internal/restic package contains a large amount of code that directly interacts with the filesystem in order to fill in information for restic.Node objects. This code should move into the internal/fs package.

Besides that the code should be cleaned up in several regards:

• move code Extract filesystem code from restic.Node #5022
• cleanup and reduce API interface of fs package Cleanup FS package #5024
  • limit our custom fs code to backup/restore usage. For other code like the backend or cache, the go standard library should be up to the task with only minor exceptions. Cleanup FS package #5024
• refactor archiver to always use FS interface
  • most changes: archiver: use FS interface nearly everywhere and cleanup exports #5023
  • NodeFromFileInfo: fs: move NodeFromFileInfo into FS interface #5060
• work with file handles instead of paths to properly handle disappearing files Ignore disappeared source files #3098
  • refactor FS interface: fs: rework FS interface to be handle based #5143
  • implement File interface using file handles: fs: filehandle-based File #5160
  • ignore errors if file disappears between readdir and open: backup: Ignore disappeared files #5145
• refactor restorer to use FSWriter (name TBD) interface