Updater

- The updater looks for updates to certificates from the certificate
  store.
- The updates are spaced by random time intervals so that the
  reconstruction of the content of the cert store is made more
  difficult.
- The updater can be send into the background - start, stop and status
  are implemented.
- The state of the updater is persisted to disk so that the update
  procedure survives a restart.

config/config.toml

@@ -8,6 +8,10 @@ sequoia_home = "/tmp/sq_home"
 #keyservers = [ "hkps://keys.openpgp.org/", "hkps://mail-api.proton.me", "hkps://keys.mailvelope.com", "hkps://keyserver.ubuntu.com", "hkps://sks.pod01.fleetstreetops.com" ]
 keyservers = [ "hkp://example.com" ]
 
+[updater]
+wait_min = 1
+wait_max = 2
+
 [logging.appenders.console]
 kind = "console"
 [logging.appenders.console.encoder]

config/log4rs.yml

@@ -1,16 +0,0 @@
-appenders:
-  stdout_appender:
-    kind: console
-    encoder:
-      pattern: "{h({d(%Y-%m-%d %H:%M:%S)(utc)} - {l}: {m}{n})}"
-
-  file_appender:
-    kind: file
-    path: "/tmp/husk.log"
-    encoder:
-      pattern: "{h({d(%Y-%m-%d %H:%M:%S)(utc)} - {l}: {m}{n})}"
-
-root:
-  level: debug
-  appenders:
-    - stdout_appender