Introduce remote API for the northstar runtime

* Add new data model
* Usage of json api in console
* new client based on json api
* Serialization for Socket API with serde-json
* Remove old dcon client
* Move help to client
* Add basic info to README
* Add length to frames -- we pack the complete
  message into a frame that contains the length
  in 4 bytes before the actual message
* Add tests for frame header
* Add rake-task to do a debug build
* Use uniqu hid for start/stop/uninstall
  (no regex is constructed anymore)
  makes it unambigous which component is meant
* add request/response id pairs
* add checks for matching request-response id pairs
* move api to north_common
* move API functionality out of command_processor
  into state so that it might be reused
* update API documentation
* Fix clippy warnings
* add clippy nightly checks to rake task

Cargo.toml

@@ -1,7 +1,6 @@
 [workspace]
 
 members = [
-    "dcon",
     "examples/container/cpueater",
     "examples/container/crashing",
     "examples/container/datarw",
@@ -12,9 +11,10 @@ members = [
     "minijail/minijail-sys",
     "north",
     "north_common",
+    "nstar",
     "sextant",
 ]
 
 [profile.release]
 lto = true
-
+opt-level = 'z' # Optimize for size

README.md

@@ -30,7 +30,7 @@ So far we tested Northstar on
 - [x] chroot environment - every process only sees it's own environment
 - [ ] User-support of configuring and managing network-namespaces
 - [ ] Dedicated UID for each container
-- [ ] Management API of the runtime [#64](https://github.com/esrlabs/northstar/issues/64)
+- [x] Management API of the runtime
 - [x] Signature Check of NPK [#54](https://github.com/esrlabs/northstar/issues/54)
 - [ ] PID Namespaces [#51](https://github.com/esrlabs/northstar/issues/51)
 
@@ -50,7 +50,7 @@ So far we tested Northstar on
 * secure boot
 * verification on each read access prevents manipulation
 
-## How do Northstar images/containers work?
+## How do Northstar images/containers work
 
 ### Northstar Packages (NPK)
 
@@ -174,6 +174,16 @@ Both `memory` and `cpu` will tell northstar where to mount the cgroup hierarchie
 * **`device_mapper`** -- Device mapper control file.
 * **`device_mapper_dev`** -- Prefix of device mapper mappings.
 
+## Controlling the runtime
+
+The northstar runtime can be controlled our `nstar` application or from a custom application. You can
+
+- start and stop containers
+- uninstall or upgrade containers
+- query information about running processes and setttings
+- ...
+With `nstar` we include a commandline interface that can be used to issue commands to the runtime. Underneth all communication happends via protocol-buffer objects over sockets (see [the runtime API README](north_common/README.md))
+
 ## Examples
 
 If you want to see how containers can look like, take a look at the examples in the examples directory.