dbus: rauc: implement forced polling via update channel files

Users managing a fleet of devices with custom-built update bundles and
update channel may want to automatically enable update polling and
automatic installation of updates without having to do so explicitly via
the web ui. (At least we at Pengutronix do).

Enable this usecase by adding optional `force_polling` and
`force_auto_install` config options to the update channel definition
files.

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

Author: hnez

openapi.yaml

@@ -1162,6 +1162,10 @@ components:
                 type: string,
               newer_than_installed:
                 type: boolean
+          force_polling:
+            type: boolean
+          force_auto_install:
+            type: boolean
 
     ServiceStatus:
       type: object

src/dbus/rauc/system_conf.rs

@@ -65,7 +65,20 @@ pub fn update_system_conf(
     enable_auto_install: bool,
 ) -> std::io::Result<bool> {
     let dynamic_conf = {
-        match poll_section(primary_channel, enable_polling, enable_auto_install) {
+        // Allow force-enabling update polling and automatic installations
+        // via the update channel config file to implement company wide
+        // auto-update policies.
+        let force_polling = primary_channel
+            .and_then(|pc| pc.force_polling)
+            .unwrap_or(false);
+        let force_auto_install = primary_channel
+            .and_then(|pc| pc.force_auto_install)
+            .unwrap_or(false);
+
+        let polling = enable_polling || force_polling;
+        let auto_install = enable_auto_install || force_auto_install;
+
+        match poll_section(primary_channel, polling, auto_install) {
             Ok(Some(ps)) => {
                 // We use the config in /etc as a template ...
                 let static_conf = read_to_string(STATIC_CONF_PATH)?;

src/dbus/rauc/update_channels.rs

@@ -54,6 +54,8 @@ pub struct Channel {
     pub enabled: bool,
     pub primary: bool,
     pub bundle: Option<UpstreamBundle>,
+    pub force_polling: Option<bool>,
+    pub force_auto_install: Option<bool>,
 }
 
 #[derive(Serialize, Deserialize, Clone, PartialEq)]
@@ -66,6 +68,8 @@ pub struct ChannelFile {
     pub description: String,
     pub url: String,
     pub polling_interval: Option<String>,
+    pub force_polling: Option<bool>,
+    pub force_auto_install: Option<bool>,
 }
 
 #[cfg(not(feature = "demo_mode"))]
@@ -145,6 +149,8 @@ impl Channel {
             enabled: false,
             primary: false,
             bundle: None,
+            force_polling: channel_file.force_polling,
+            force_auto_install: channel_file.force_auto_install,
         };
 
         ch.update_enabled();