Snap: use strict confinement (fix #48) (#50)

* snapcraft.yaml: use strict confinement

* __main__.py: isort

snapcraft.yaml

@@ -7,15 +7,34 @@ description: |
   It uses automatic caching of Juju's status in json format to enable faster parsing.
 license: MIT
 grade: stable
-confinement: classic
+confinement: strict
 
 architectures: [amd64, i386, arm64, armhf, ppc64el]
 
+plugs:
+  juju-bin:
+    interface: content
+    content: juju-bin
+    target: $SNAP/usr/juju
+    default-provider: juju
+  dot-local-share-juju:
+    interface: personal-files
+    read:
+      - $HOME/.local/share/juju
+      - $HOME/.local/share/juju/ssh
+      - $HOME/.local/share/juju/lxd
+    write:
+      - $HOME/.local/share/juju/cookies
+
 apps:
   juju-jockey:
     command: bin/juju-jockey
     plugs:
+      - juju-bin
+      - dot-local-share-juju
       - home
+      - ssh-keys
+      - network
 
 parts:
   juju-jockey:

src/jockey/__main__.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 """Jockey: a Juju query language to put all of your Juju objects at your fingertips."""
 from argparse import ArgumentParser, FileType, Namespace
+import os
 import sys
 from typing import Optional, Sequence
 
@@ -17,6 +18,10 @@
 from jockey.status_keeper import cache_juju_status, read_local_juju_status_file, retrieve_juju_cache
 
 
+if "SNAP" in os.environ:
+    os.environ["PATH"] += ":" + os.path.join(os.environ["SNAP"], "usr", "juju", "bin")
+
+
 INFO_MESSAGE = f"""
 +----+
 |NOTE|