drawer/plans/phase5.md

Phase 5

For phase 5, implement the open command. This will provide an implementation for the perform_open method, and will also need another couple error variants, unless they already exist:

• The given key might not open the given drawer file
• The drawer file might not decrypt to a valid tarball

The code for the open command is pretty much the same as the close command, in reverse order:

• Read the drawer file into an array
• Decrypt it with the key (failing if it won't decrypt, or if it's not a valid tarball)
• Expand it with the tar crate into the target path