rauc: use InspectBundle instead of deprecated Info DBus API

The InspectBundle method allows providing a dictionary of extra arguments,
which makes it more flexible than Info.
We do not need this flexibility yet, but at least we no longer use a
deprecated API.

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

src/dbus/rauc.rs

@@ -45,6 +45,8 @@ use installer::InstallerProxy;
 
 #[cfg(feature = "demo_mode")]
 mod imports {
+    use std::collections::HashMap;
+
     pub(super) struct InstallerProxy<'a> {
         _dummy: &'a (),
     }
@@ -54,11 +56,24 @@ mod imports {
             Some(Self { _dummy: &() })
         }
 
-        pub async fn info(&self, _url: &str) -> anyhow::Result<(String, String)> {
-            let compatible = "Linux Automation GmbH - LXA TAC".to_string();
-            let version = "24.04-20240415070800".to_string();
-
-            Ok((compatible, version))
+        pub async fn inspect_bundle(
+            &self,
+            _source: &str,
+            _args: HashMap<&str, zbus::zvariant::Value<'_>>,
+        ) -> zbus::Result<HashMap<String, zbus::zvariant::OwnedValue>> {
+            let update: HashMap<String, String> = [
+                (
+                    "compatible".into(),
+                    "Linux Automation GmbH - LXA TAC".into(),
+                ),
+                ("version".into(), "24.04-20240415070800".into()),
+            ]
+            .into();
+
+            let info: HashMap<String, zbus::zvariant::OwnedValue> =
+                [("update".into(), update.into())].into();
+
+            Ok(info)
         }
     }
 

src/dbus/rauc/update_channels.rs

@@ -15,6 +15,7 @@
 // with this program; if not, write to the Free Software Foundation, Inc.,
 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+use std::collections::HashMap;
 use std::fs::{read_dir, read_to_string, DirEntry};
 use std::os::unix::ffi::OsStrExt;
 use std::path::Path;
@@ -62,6 +63,28 @@ pub struct ChannelFile {
     pub polling_interval: Option<String>,
 }
 
+fn zvariant_walk_nested_dicts<'a>(map: &'a zvariant::Dict, path: &[&str]) -> Result<&'a str> {
+    let (&key, rem) = path
+        .split_first()
+        .ok_or_else(|| anyhow!("Got an empty path to walk"))?;
+
+    let value: &zvariant::Value = map
+        .get(key)?
+        .ok_or_else(|| anyhow!("Could not find key \"{key}\" in dict"))?;
+
+    if rem.is_empty() {
+        value.downcast_ref().ok_or_else(|| {
+            anyhow!("Failed to convert value in dictionary for key \"{key}\" to a string")
+        })
+    } else {
+        let value = value.downcast_ref().ok_or_else(|| {
+            anyhow!("Failed to convert value in dictionary for key \"{key}\" to a dict")
+        })?;
+
+        zvariant_walk_nested_dicts(value, rem)
+    }
+}
+
 impl Channel {
     fn from_file(path: &Path) -> Result<Self> {
         let file_name = || {
@@ -168,7 +191,14 @@ impl Channel {
         self.bundle = None;
 
         if self.enabled {
-            let (compatible, version) = proxy.info(&self.url).await?;
+            let args = HashMap::new();
+            let bundle = proxy.inspect_bundle(&self.url, args).await?;
+            let bundle: zvariant::Dict = bundle.into();
+
+            let compatible =
+                zvariant_walk_nested_dicts(&bundle, &["update", "compatible"])?.to_owned();
+            let version = zvariant_walk_nested_dicts(&bundle, &["update", "version"])?.to_owned();
+
             self.bundle = Some(UpstreamBundle::new(compatible, version, slot_status));
         }