phase 5

plans/phase5.md

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+# 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