Merge branch 'endrift/remote-interface' into 'master'

Draft: Add support for remote interfaces

See merge request holo/steamos-manager!23

Cargo.lock

@@ -1196,6 +1196,7 @@ dependencies = [
  "serde",
  "serde_json",
  "speech-dispatcher",
+ "steamos-manager-macros",
  "steamos-manager-proxy",
  "strum",
  "sysinfo",
@@ -1212,6 +1213,15 @@ dependencies = [
  "zbus_xml",
 ]
 
+[[package]]
+name = "steamos-manager-macros"
+version = "25.6.1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "steamos-manager-proxy"
 version = "25.6.1"

Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 resolver = "2"
-members = ["steamos-manager", "steamos-manager-proxy"]
+members = ["steamos-manager", "steamos-manager-macros", "steamos-manager-proxy"]
 
 [profile.release]
 strip="symbols"

data/interfaces/com.steampowered.SteamOSManager1.xml

@@ -298,6 +298,27 @@
 
   </interface>
 
+  <!--
+      com.steampowered.SteamOSManager1.RemoteInterface1
+      @short_description: TKTK
+  -->
+  <interface name="com.steampowered.SteamOSManager1.RemoteInterface1">
+
+    <method name="RegisterInterface">
+      <arg type="s" name="interface" direction="in"/>
+      <arg type="o" name="object" direction="in"/>
+      <arg type="b" name="registered" direction="out"/>
+	</method>
+
+    <method name="UnregisterInterface">
+      <arg type="s" name="interface" direction="in"/>
+      <arg type="b" name="unregistered" direction="out"/>
+	</method>
+
+    <property name="RemoteInterfaces" type="as" access="read"/>
+
+  </interface>
+
   <!--
       com.steampowered.SteamOSManager1.ScreenReader1
       @short_description: Optional interface for managing a screen reader.

steamos-manager-macros/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "steamos-manager-macros"
+version = "25.6.1"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+quote = "1.0"
+syn = "2.0"
+proc-macro2 = "1.0"

steamos-manager-macros/src/lib.rs

@@ -0,0 +1,418 @@
+/*
+ * Copyright © 2023 Collabora Ltd.
+ * Copyright © 2024 Valve Software
+ * Copyright © 2024 Igalia S.L.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+use proc_macro::TokenStream;
+use proc_macro2::{Group, Literal, TokenStream as TokenStream2, TokenTree};
+use quote::{format_ident, quote, ToTokens};
+use std::collections::HashMap;
+use syn::parse::{self, Parse, ParseStream};
+use syn::spanned::Spanned;
+use syn::{
+    self, parse_macro_input, Attribute, FnArg, GenericArgument, Ident, ImplItem, ItemImpl, Meta,
+    PathArguments, ReturnType, Type,
+};
+
+#[derive(Debug)]
+struct Interface {
+    name: String,
+    properties: Vec<Property>,
+    methods: Vec<Method>,
+}
+
+#[derive(Debug)]
+struct Method {
+    name: Ident,
+    args: Vec<Type>,
+    ret: Option<Type>,
+}
+
+#[derive(Debug)]
+struct Property {
+    name: Ident,
+    attr: Attribute,
+    emits_changed: bool,
+    ty: Type,
+    setter: bool,
+}
+
+fn clean_return_type(ty: Type) -> Type {
+    match ty {
+        Type::Path(ref path) => {
+            if let Some(tail) = path.path.segments.last() {
+                if tail.ident == "Result" {
+                    match &tail.arguments {
+                        PathArguments::None => ty,
+                        PathArguments::AngleBracketed(args) => match args.args.first() {
+                            Some(GenericArgument::Type(ty)) => ty.clone(),
+                            _ => todo!(),
+                        },
+                        PathArguments::Parenthesized(_) => todo!("parenthesized return type"),
+                    }
+                } else {
+                    ty
+                }
+            } else {
+                todo!("no tail");
+            }
+        }
+        other => todo!("unimplemented return type {other:?}"),
+    }
+}
+
+fn parse_kv_pairs(group: Group) -> parse::Result<HashMap<String, Literal>> {
+    let mut tokens = group.stream().into_iter();
+    let mut kv = HashMap::new();
+    loop {
+        let prop = match tokens.next() {
+            Some(TokenTree::Ident(prop)) => prop,
+            Some(TokenTree::Punct(punct)) if punct.as_char() == ',' => continue,
+            Some(token) => {
+                return Err(syn::Error::new(token.span(), "expected `,` or identifier"));
+            }
+            None => break,
+        };
+        let value = {
+            match tokens.next() {
+                Some(TokenTree::Punct(punct)) if punct.as_char() == '=' => (),
+                Some(token) => {
+                    return Err(syn::Error::new(token.span(), "expected `=`"));
+                }
+                None => {
+                    return Err(syn::Error::new(group.span_close(), "expected `=`"));
+                }
+            }
+            match tokens.next() {
+                Some(TokenTree::Literal(lit)) => lit,
+                Some(token) => {
+                    return Err(syn::Error::new(token.span(), "expected string"));
+                }
+                None => {
+                    return Err(syn::Error::new(group.span_close(), "expected string"));
+                }
+            }
+        };
+        let prop_str = prop.to_string();
+        if kv.insert(prop_str, value).is_some() {
+            return Err(syn::Error::new(
+                prop.span(),
+                format!("duplicate key \"{prop}\""),
+            ));
+        }
+    }
+    Ok(kv)
+}
+
+impl Parse for Interface {
+    fn parse(input: ParseStream<'_>) -> parse::Result<Interface> {
+        let iface_impl: ItemImpl = input.parse()?;
+        let Type::Path(path) = *iface_impl.self_ty else {
+            return Err(syn::Error::new(input.span(), "Invalid name identifier"));
+        };
+        let name = path.path.require_ident()?;
+        let mut properties = Vec::new();
+        let mut methods = Vec::new();
+        for item in iface_impl.items {
+            let ImplItem::Fn(fn_item) = item else {
+                continue;
+            };
+            let mut prop_attr = None;
+            let mut emits_changed = true;
+            for attr in fn_item.attrs {
+                let Meta::List(ref list) = attr.meta else {
+                    continue;
+                };
+                if list.path.require_ident()? != "zbus" {
+                    continue;
+                }
+                let mut tokens = list.tokens.clone().into_iter();
+                let first = tokens.next();
+                match first {
+                    Some(TokenTree::Ident(ident)) if ident == "property" => {
+                        prop_attr = Some(attr);
+                        if let Some(TokenTree::Group(group)) = tokens.next() {
+                            let kv = parse_kv_pairs(group)?;
+                            match kv.get("emits_changed_signal") {
+                                None => emits_changed = true,
+                                Some(val) if val.to_string() == "true" => emits_changed = true,
+                                _ => emits_changed = false,
+                            }
+                        }
+                    }
+                    Some(TokenTree::Ident(ident)) if ident == "signal" => {
+                        todo!("signals not implemented")
+                    }
+                    other => todo!("unknown attribute {other:?}"),
+                }
+            }
+            let sig = fn_item.sig;
+            let name = sig.ident;
+            let inputs = sig.inputs;
+            if !matches!(inputs.first(), Some(FnArg::Receiver(_))) {
+                return Err(syn::Error::new(
+                    sig.paren_token.span.open(),
+                    "expected `self`",
+                ));
+            }
+
+            if let Some(attr) = prop_attr {
+                let setter = name.to_string().starts_with("set_");
+                let ty = if setter {
+                    let mut ty = None;
+                    emits_changed = false;
+                    'input: for input in inputs.into_iter().skip(1) {
+                        let span = input.span();
+                        let FnArg::Typed(fty) = input else {
+                            continue;
+                        };
+                        for attr in &fty.attrs {
+                            let Meta::List(ref list) = attr.meta else {
+                                continue;
+                            };
+                            let Some(ident) = list.path.get_ident() else {
+                                continue;
+                            };
+                            if ident == "zbus" {
+                                continue 'input;
+                            }
+                        }
+                        if ty.is_some() {
+                            return Err(syn::Error::new(span, "unexpected argument type"));
+                        }
+                        ty = Some(*fty.ty);
+                    }
+                    ty.unwrap()
+                } else {
+                    if inputs.len() != 1 {
+                        return Err(syn::Error::new(
+                            sig.paren_token.span.join(),
+                            "expected 1 argument",
+                        ));
+                    }
+                    let ReturnType::Type(_, ret) = sig.output else {
+                        return Err(syn::Error::new(sig.fn_token.span, "expected return value"));
+                    };
+                    clean_return_type(*ret)
+                };
+                properties.push(Property {
+                    name,
+                    attr,
+                    setter,
+                    ty,
+                    emits_changed,
+                });
+            } else {
+                let ret = match sig.output {
+                    ReturnType::Type(_, ret) => Some(clean_return_type(*ret)),
+                    ReturnType::Default => None,
+                };
+                let args = inputs
+                    .into_iter()
+                    .skip(1)
+                    .map(|arg| {
+                        let FnArg::Typed(ty) = arg else {
+                            panic!();
+                        };
+                        *ty.ty
+                    })
+                    .collect();
+                methods.push(Method { name, args, ret });
+            }
+        }
+
+        Ok(Interface {
+            name: name.to_string(),
+            methods,
+            properties,
+        })
+    }
+}
+
+impl ToTokens for Interface {
+    fn to_tokens(&self, stream: &mut TokenStream2) {
+        let mut substream = TokenStream2::new();
+        let mut signals = Vec::new();
+        for prop in self.properties.iter() {
+            prop.to_tokens(&mut substream);
+            if prop.emits_changed {
+                signals.push(format_ident!("{}_changed", prop.name.clone()));
+            }
+        }
+        for method in self.methods.iter() {
+            method.to_tokens(&mut substream);
+        }
+
+        let name = format_ident!("{}", self.name);
+        let struct_name: Ident = format_ident!("{}Remote", self.name);
+        let proxy_name: Ident = format_ident!("{}Proxy", self.name);
+
+        let receivers: Vec<Ident> = signals
+            .iter()
+            .map(|name| format_ident!("receive_{name}"))
+            .collect();
+
+        stream.extend(quote! {
+            impl #struct_name {
+                #substream
+            }
+
+            struct #struct_name {
+                proxy: #proxy_name<'static>,
+                signal_task: JoinHandle<Result<()>>,
+                interlock: Option<oneshot::Sender<()>>,
+            }
+
+            impl #struct_name {
+                pub async fn new(
+                    destination: &BusName<'static>,
+                    path: ObjectPath<'static>,
+                    connection: &Connection
+                )
+                -> fdo::Result<#struct_name> {
+                    let proxy = #proxy_name::builder(connection)
+                        .path(path)?
+                        .destination(destination)?
+                        .build()
+                        .await?;
+                    let (signal_task, interlock) = #struct_name::signal_task(proxy.clone(), connection.clone())
+                        .await
+                        .map_err(to_zbus_fdo_error)?;
+                    Ok(#struct_name {
+                        proxy,
+                        signal_task,
+                        interlock: Some(interlock),
+                    })
+                }
+
+                fn remote(&self) -> &BusName<'_> {
+                    self.proxy.inner().destination()
+                }
+
+                async fn signal_task(
+                    proxy: #proxy_name<'static>,
+                    connection: Connection
+                ) -> Result<(JoinHandle<Result<()>>, oneshot::Sender<()>)> {
+                    let (tx1, rx1) = oneshot::channel();
+                    let (tx2, rx2) = oneshot::channel();
+                    let handle = spawn(async move {
+                        let object_server = connection.object_server();
+                        let dbus_proxy = DBusProxy::new(&connection).await?;
+                        let mut name_changed_receiver = dbus_proxy.receive_name_owner_changed().await?;
+                        #(let mut #receivers = proxy.#receivers().await;)*
+                        // This should never fail. If it does, something has gone very wrong.
+                        tx1.send(()).unwrap();
+                        rx2.await?;
+                        let mut interface = object_server
+                            .interface::<_, #struct_name>(MANAGER_PATH)
+                            .await?;
+                        let emitter = interface.signal_emitter();
+                        loop {
+                            tokio::select! {
+                                Some(changed) = name_changed_receiver.next() => {
+                                    match changed.args() {
+                                        Ok(args) => {
+                                            if args.name() != proxy.inner().destination() {
+                                                continue;
+                                            }
+                                            if args.new_owner().is_none() {
+                                                let manager = object_server
+                                                    .interface::<_, RemoteInterface1>(MANAGER_PATH)
+                                                    .await?;
+                                                let emitter = manager.signal_emitter();
+                                                manager
+                                                    .get_mut()
+                                                    .await
+                                                    .unregister_interface_impl(
+                                                        Self::name().as_str(),
+                                                        None,
+                                                        &connection,
+                                                        emitter
+                                                    )
+                                                    .await?;
+                                            }
+                                        },
+                                        Err(e) => error!("Error receiving signal: {e}"),
+                                    }
+                                },
+                                #(Some(val) = #receivers.next() => {
+                                    if let Err(e) = interface.get().await.#signals(&emitter).await {
+                                        error!("Error receiving signal: {e}");
+                                    };
+                                },)*
+                            }
+                        }
+                    });
+                    rx1.await?;
+                    Ok((handle, tx2))
+                }
+            }
+
+            impl Drop for #struct_name {
+                fn drop(&mut self) {
+                    self.signal_task.abort();
+                }
+            }
+
+            impl RemoteInterface for #name {
+                type Remote = #struct_name;
+            }
+        });
+    }
+}
+
+impl ToTokens for Method {
+    fn to_tokens(&self, stream: &mut TokenStream2) {
+        let name = &self.name;
+        let args = &self.args;
+        let ret = &self.ret;
+        let arg_names: Vec<Ident> = (0..args.len()).map(|i| format_ident!("arg{i}")).collect();
+        stream.extend(quote! {
+            async fn #name(&self #(, #arg_names: #args)*) -> fdo::Result<#ret> {
+                self.proxy.#name(#(#arg_names),*).await.map_err(zbus_to_zbus_fdo)
+            }
+        });
+    }
+}
+
+impl ToTokens for Property {
+    fn to_tokens(&self, stream: &mut TokenStream2) {
+        let attr = &self.attr;
+        let ty = &self.ty;
+        let name = &self.name;
+        if self.setter {
+            stream.extend(quote! {
+                #attr
+                async fn #name(&self, arg: #ty) -> zbus::Result<()> {
+                    self.proxy.#name(arg).await
+                }
+            });
+        } else {
+            stream.extend(quote! {
+                #attr
+                async fn #name(&self) -> fdo::Result<#ty> {
+                    Ok(self.proxy.#name().await?)
+                }
+            });
+        }
+    }
+}
+
+#[proc_macro_attribute]
+pub fn remote(attr: TokenStream, input: TokenStream) -> TokenStream {
+    let attr: TokenStream2 = attr.into();
+    let imp: TokenStream2 = input.clone().into();
+    let iface = parse_macro_input!(input as Interface);
+
+    let out = quote! {
+        #[interface(#attr)]
+        #iface
+
+        #[interface(#attr)]
+        #imp
+    };
+    out.into()
+}

steamos-manager-proxy/src/lib.rs

@@ -25,6 +25,7 @@ mod hdmi_cec1;
 mod low_power_mode1;
 mod manager2;
 mod performance_profile1;
+mod remote_interface1;
 mod screenreader0;
 mod storage1;
 mod tdp_limit1;
@@ -44,6 +45,7 @@ pub use crate::hdmi_cec1::HdmiCec1Proxy;
 pub use crate::low_power_mode1::LowPowerMode1Proxy;
 pub use crate::manager2::Manager2Proxy;
 pub use crate::performance_profile1::PerformanceProfile1Proxy;
+pub use crate::remote_interface1::RemoteInterface1Proxy;
 pub use crate::screenreader0::ScreenReader0Proxy;
 pub use crate::storage1::Storage1Proxy;
 pub use crate::tdp_limit1::TdpLimit1Proxy;

steamos-manager-proxy/src/remote_interface1.rs

@@ -0,0 +1,35 @@
+//! # D-Bus interface proxy for: `com.steampowered.SteamOSManager1.RemoteInterface1`
+//!
+//! This code was generated by `zbus-xmlgen` `5.1.0` from D-Bus introspection data.
+//! Source: `com.steampowered.SteamOSManager1.xml`.
+//!
+//! You may prefer to adapt it, instead of using it verbatim.
+//!
+//! More information can be found in the [Writing a client proxy] section of the zbus
+//! documentation.
+//!
+//!
+//! [Writing a client proxy]: https://dbus2.github.io/zbus/client.html
+//! [D-Bus standard interfaces]: https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces,
+use zbus::proxy;
+#[proxy(
+    interface = "com.steampowered.SteamOSManager1.RemoteInterface1",
+    default_service = "com.steampowered.SteamOSManager1",
+    default_path = "/com/steampowered/SteamOSManager1",
+    assume_defaults = true
+)]
+pub trait RemoteInterface1 {
+    /// RegisterInterface method
+    fn register_interface(
+        &self,
+        interface: &str,
+        object: &zbus::zvariant::ObjectPath<'_>,
+    ) -> zbus::Result<bool>;
+
+    /// UnregisterInterface method
+    fn unregister_interface(&self, interface: &str) -> zbus::Result<bool>;
+
+    /// RemoteInterfaces property
+    #[zbus(property)]
+    fn remote_interfaces(&self) -> zbus::Result<Vec<String>>;
+}

steamos-manager/Cargo.toml

@@ -21,6 +21,7 @@ regex = "1"
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 serde_json = "1.0"
 speech-dispatcher = "0.16"
+steamos-manager-macros = { path = "../steamos-manager-macros" }
 steamos-manager-proxy = { path = "../steamos-manager-proxy" }
 strum = { version = "0.27", features = ["derive"] }
 sysinfo = "0.35"

steamos-manager/src/manager/user.rs

@@ -11,12 +11,18 @@ use std::collections::HashMap;
 use tokio::fs::try_exists;
 use tokio::sync::mpsc::{Sender, UnboundedSender};
 use tokio::sync::oneshot;
+use tokio::task::{spawn, JoinHandle};
 use tokio_stream::StreamExt;
 use tracing::error;
-use zbus::object_server::SignalEmitter;
+use zbus::fdo::{self, DBusProxy};
+use zbus::message::Header;
+use zbus::names::{BusName, UniqueName};
+use zbus::object_server::{Interface, InterfaceRef, SignalEmitter};
 use zbus::proxy::{Builder, CacheProperties};
-use zbus::zvariant::Fd;
+use zbus::zvariant::{Fd, ObjectPath};
-use zbus::{fdo, interface, zvariant, Connection, ObjectServer, Proxy};
+use zbus::{interface, zvariant, Connection, ObjectServer, Proxy};
+
+use steamos_manager_macros::remote;
 
 use crate::cec::{HdmiCecControl, HdmiCecState};
 use crate::daemon::user::Command;
@@ -34,6 +40,11 @@ use crate::power::{
     get_gpu_clocks, get_gpu_clocks_range, get_gpu_performance_level, get_gpu_power_profile,
     get_max_charge_level, get_platform_profile, TdpManagerCommand,
 };
+use crate::proxy::{
+    BatteryChargeLimit1Proxy, FactoryReset1Proxy, FanControl1Proxy, GpuPerformanceLevel1Proxy,
+    GpuPowerProfile1Proxy, PerformanceProfile1Proxy, Storage1Proxy, UpdateBios1Proxy,
+    UpdateDock1Proxy,
+};
 use crate::screenreader::{OrcaManager, ScreenReaderAction, ScreenReaderMode};
 use crate::wifi::{
     get_wifi_backend, get_wifi_power_management_state, list_wifi_interfaces, WifiBackend,
@@ -102,6 +113,92 @@ macro_rules! setter {
     };
 }
 
+macro_rules! register_interface {
+    (($self:expr, $name:expr, $object:expr, $bus_name:expr, $connection:expr, $ctxt:expr); $($var:ident: $iface:ident,)*) => {
+        let object_server = $connection.object_server();
+        let object = $object.to_owned();
+
+        match $name {
+            $(_ if $name == <$iface as Interface>::name().as_str() => {
+                if $self.$var.is_some() {
+                    return Ok(false);
+                }
+                if object_server
+                    .interface::<_, $iface>(MANAGER_PATH)
+                    .await
+                    .is_ok()
+                {
+                    return Ok(false);
+                }
+                if object_server
+                    .interface::<_, <$iface as RemoteInterface>::Remote>(MANAGER_PATH)
+                    .await
+                    .is_ok()
+                {
+                    return Ok(false);
+                }
+
+                let remote = <$iface as RemoteInterface>::Remote::new(
+                    &$bus_name.to_owned(),
+                    object,
+                    $connection,
+                )
+                .await?;
+                object_server.at(MANAGER_PATH, remote).await?;
+                let iface = object_server.interface
+                    ::<_, <$iface as RemoteInterface>::Remote>(MANAGER_PATH).await?;
+                if let Some(interlock) = iface.get_mut().await.interlock.take() {
+                    let _ = interlock.send(());
+                }
+                $self.$var = Some(iface);
+                $self.remote_interfaces_changed(&$ctxt).await?;
+                Ok(true)
+            })*
+            _ => {
+                Err(fdo::Error::InvalidArgs(format!(
+                    "Unknown interface {}", $name
+                )))
+            }
+        }
+    };
+}
+
+macro_rules! unregister_interface {
+    (($self:expr, $name:expr, $sender:expr, $connection:expr, $ctxt:expr); $($var:ident: $iface:ident,)*) => {
+        let object_server = $connection.object_server();
+
+        match $name {
+            $(_ if $name == <$iface as Interface>::name().as_str() => {
+                let Some(iface) = $self.$var.as_ref() else {
+                    return Ok(false);
+                };
+                if let Some(sender) = $sender {
+                    let iface = iface.get().await;
+                    let remote = iface.remote();
+                    if remote != sender {
+                        return Err(fdo::Error::AccessDenied(format!(
+                            "Interface {} is owned by a different remote", $name
+                        )));
+                    }
+                }
+                object_server.remove::<$iface, _>(MANAGER_PATH).await?;
+                $self.$var = None;
+                $self.remote_interfaces_changed($ctxt).await?;
+                Ok(true)
+            })*
+            _ => {
+                Err(fdo::Error::InvalidArgs(format!(
+                    "Unknown interface {}", $name
+                )))
+            }
+        }
+    };
+}
+
+trait RemoteInterface {
+    type Remote: Interface;
+}
+
 struct SteamOSManager {
     proxy: Proxy<'static>,
     _job_manager: UnboundedSender<JobManagerCommand>,
@@ -157,6 +254,19 @@ struct PerformanceProfile1 {
     tdp_limit_manager: Option<UnboundedSender<TdpManagerCommand>>,
 }
 
+#[derive(Default)]
+struct RemoteInterface1 {
+    remote_battery_charge_limit1: Option<InterfaceRef<BatteryChargeLimit1Remote>>,
+    remote_factory_reset1: Option<InterfaceRef<FactoryReset1Remote>>,
+    remote_fan_control1: Option<InterfaceRef<FanControl1Remote>>,
+    remote_gpu_performance_level1: Option<InterfaceRef<GpuPerformanceLevel1Remote>>,
+    remote_gpu_power_profile1: Option<InterfaceRef<GpuPowerProfile1Remote>>,
+    remote_performance_profile1: Option<InterfaceRef<PerformanceProfile1Remote>>,
+    remote_storage1: Option<InterfaceRef<Storage1Remote>>,
+    remote_update_bios1: Option<InterfaceRef<UpdateBios1Remote>>,
+    remote_update_dock1: Option<InterfaceRef<UpdateDock1Remote>>,
+}
+
 struct ScreenReader0 {
     screen_reader: OrcaManager<'static>,
 }
@@ -270,7 +380,7 @@ impl BatteryChargeLimit1 {
     const DEFAULT_SUGGESTED_MINIMUM_LIMIT: i32 = 10;
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.BatteryChargeLimit1")]
+#[remote(name = "com.steampowered.SteamOSManager1.BatteryChargeLimit1")]
 impl BatteryChargeLimit1 {
     #[zbus(property)]
     async fn max_charge_level(&self) -> fdo::Result<i32> {
@@ -322,7 +432,7 @@ impl CpuScaling1 {
     #[zbus(property)]
     async fn set_cpu_scaling_governor(
         &self,
-        governor: String,
+        governor: &str,
         #[zbus(signal_emitter)] ctx: SignalEmitter<'_>,
     ) -> zbus::Result<()> {
         let _: () = self
@@ -333,14 +443,14 @@ impl CpuScaling1 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.FactoryReset1")]
+#[remote(name = "com.steampowered.SteamOSManager1.FactoryReset1")]
 impl FactoryReset1 {
     async fn prepare_factory_reset(&self, flags: u32) -> fdo::Result<u32> {
         method!(self, "PrepareFactoryReset", flags)
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.FanControl1")]
+#[remote(name = "com.steampowered.SteamOSManager1.FanControl1")]
 impl FanControl1 {
     #[zbus(property)]
     async fn fan_control_state(&self) -> fdo::Result<u32> {
@@ -358,7 +468,7 @@ impl FanControl1 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.GpuPerformanceLevel1")]
+#[remote(name = "com.steampowered.SteamOSManager1.GpuPerformanceLevel1")]
 impl GpuPerformanceLevel1 {
     #[zbus(property(emits_changed_signal = "const"))]
     async fn available_gpu_performance_levels(&self) -> fdo::Result<Vec<String>> {
@@ -425,7 +535,7 @@ impl GpuPerformanceLevel1 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.GpuPowerProfile1")]
+#[remote(name = "com.steampowered.SteamOSManager1.GpuPowerProfile1")]
 impl GpuPowerProfile1 {
     #[zbus(property(emits_changed_signal = "const"))]
     async fn available_gpu_power_profiles(&self) -> fdo::Result<Vec<String>> {
@@ -547,7 +657,7 @@ impl Manager2 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.PerformanceProfile1")]
+#[remote(name = "com.steampowered.SteamOSManager1.PerformanceProfile1")]
 impl PerformanceProfile1 {
     #[zbus(property(emits_changed_signal = "const"))]
     async fn available_performance_profiles(&self) -> fdo::Result<Vec<String>> {
@@ -590,7 +700,7 @@ impl PerformanceProfile1 {
         if let Some(manager) = self.tdp_limit_manager.as_ref() {
             let manager = manager.clone();
             let _ = manager.send(TdpManagerCommand::UpdateDownloadMode);
-            tokio::spawn(async move {
+            spawn(async move {
                 let (tx, rx) = oneshot::channel();
                 manager.send(TdpManagerCommand::IsActive(tx))?;
                 if rx.await?? {
@@ -624,6 +734,122 @@ impl PerformanceProfile1 {
     }
 }
 
+#[interface(name = "com.steampowered.SteamOSManager1.RemoteInterface1")]
+impl RemoteInterface1 {
+    async fn register_interface(
+        &mut self,
+        iface: &str,
+        object: ObjectPath<'_>,
+        #[zbus(header)] header: Header<'_>,
+        #[zbus(connection)] connection: &Connection,
+        #[zbus(signal_emitter)] ctxt: SignalEmitter<'_>,
+    ) -> fdo::Result<bool> {
+        let Some(sender) = header.sender() else {
+            return Err(fdo::Error::InvalidArgs(String::from("Sender missing")));
+        };
+        let bus_name = BusName::Unique(sender.to_owned());
+
+        self.register_interface_impl(iface, object, &bus_name, connection, &ctxt)
+            .await
+    }
+
+    async fn unregister_interface(
+        &mut self,
+        iface: &str,
+        #[zbus(header)] header: Header<'_>,
+        #[zbus(connection)] connection: &Connection,
+        #[zbus(signal_emitter)] ctxt: SignalEmitter<'_>,
+    ) -> fdo::Result<bool> {
+        let sender = header.sender();
+        if sender.is_none() {
+            return Err(fdo::Error::InvalidArgs(String::from("Sender missing")));
+        };
+
+        self.unregister_interface_impl(iface, sender, connection, &ctxt)
+            .await
+    }
+
+    #[zbus(property)]
+    async fn remote_interfaces(&self) -> Vec<String> {
+        let mut ifaces = Vec::new();
+        if self.remote_battery_charge_limit1.is_some() {
+            ifaces.push(BatteryChargeLimit1::name().to_string());
+        }
+        if self.remote_factory_reset1.is_some() {
+            ifaces.push(FactoryReset1::name().to_string());
+        }
+        if self.remote_fan_control1.is_some() {
+            ifaces.push(FanControl1::name().to_string());
+        }
+        if self.remote_gpu_performance_level1.is_some() {
+            ifaces.push(GpuPerformanceLevel1::name().to_string());
+        }
+        if self.remote_gpu_power_profile1.is_some() {
+            ifaces.push(GpuPowerProfile1::name().to_string());
+        }
+        if self.remote_performance_profile1.is_some() {
+            ifaces.push(PerformanceProfile1::name().to_string());
+        }
+        if self.remote_storage1.is_some() {
+            ifaces.push(Storage1::name().to_string());
+        }
+        if self.remote_update_bios1.is_some() {
+            ifaces.push(UpdateBios1::name().to_string());
+        }
+        if self.remote_update_dock1.is_some() {
+            ifaces.push(UpdateDock1::name().to_string());
+        }
+        ifaces
+    }
+}
+
+impl RemoteInterface1 {
+    async fn register_interface_impl(
+        &mut self,
+        iface: &str,
+        object: ObjectPath<'_>,
+        bus_name: &BusName<'_>,
+        connection: &Connection,
+        ctxt: &SignalEmitter<'_>,
+    ) -> fdo::Result<bool> {
+        register_interface! {
+            (self, iface, object, bus_name, connection, ctxt);
+
+            remote_battery_charge_limit1: BatteryChargeLimit1,
+            remote_factory_reset1: FactoryReset1,
+            remote_fan_control1: FanControl1,
+            remote_gpu_performance_level1: GpuPerformanceLevel1,
+            remote_gpu_power_profile1: GpuPowerProfile1,
+            remote_performance_profile1: PerformanceProfile1,
+            remote_storage1: Storage1,
+            remote_update_bios1: UpdateBios1,
+            remote_update_dock1: UpdateDock1,
+        }
+    }
+
+    async fn unregister_interface_impl(
+        &mut self,
+        iface: &str,
+        sender: Option<&UniqueName<'_>>,
+        connection: &Connection,
+        ctxt: &SignalEmitter<'_>,
+    ) -> fdo::Result<bool> {
+        unregister_interface! {
+            (self, iface, sender, connection, ctxt);
+
+            remote_battery_charge_limit1: BatteryChargeLimit1,
+            remote_factory_reset1: FactoryReset1,
+            remote_fan_control1: FanControl1,
+            remote_gpu_performance_level1: GpuPerformanceLevel1,
+            remote_gpu_power_profile1: GpuPowerProfile1,
+            remote_performance_profile1: PerformanceProfile1,
+            remote_storage1: Storage1,
+            remote_update_bios1: UpdateBios1,
+            remote_update_dock1: UpdateDock1,
+        }
+    }
+}
+
 impl ScreenReader0 {
     async fn new(connection: &Connection) -> Result<ScreenReader0> {
         let screen_reader = OrcaManager::new(connection).await?;
@@ -747,7 +973,7 @@ impl ScreenReader0 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.Storage1")]
+#[remote(name = "com.steampowered.SteamOSManager1.Storage1")]
 impl Storage1 {
     async fn format_device(
         &mut self,
@@ -820,14 +1046,14 @@ impl TdpLimit1 {
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.UpdateBios1")]
+#[remote(name = "com.steampowered.SteamOSManager1.UpdateBios1")]
 impl UpdateBios1 {
     async fn update_bios(&mut self) -> fdo::Result<zvariant::OwnedObjectPath> {
         job_method!(self, "UpdateBios")
     }
 }
 
-#[interface(name = "com.steampowered.SteamOSManager1.UpdateDock1")]
+#[remote(name = "com.steampowered.SteamOSManager1.UpdateDock1")]
 impl UpdateDock1 {
     async fn update_dock(&mut self) -> fdo::Result<zvariant::OwnedObjectPath> {
         job_method!(self, "UpdateDock")
@@ -1049,7 +1275,7 @@ async fn create_device_interfaces(
         }
 
         let object_server = object_server.clone();
-        tokio::spawn(async move {
+        spawn(async move {
             let (tx, rx) = oneshot::channel();
             manager.send(TdpManagerCommand::IsActive(tx))?;
             if rx.await?? {
@@ -1110,6 +1336,7 @@ pub(crate) async fn create_interfaces(
         proxy: proxy.clone(),
         channel: daemon,
     };
+    let remote_interface = RemoteInterface1::default();
     let screen_reader = ScreenReader0::new(&session).await?;
     let wifi_power_management = WifiPowerManagement1 {
         proxy: proxy.clone(),
@@ -1164,6 +1391,7 @@ pub(crate) async fn create_interfaces(
     }
 
     object_server.at(MANAGER_PATH, manager2).await?;
+    object_server.at(MANAGER_PATH, remote_interface).await?;
 
     if try_exists(path("/usr/bin/orca")).await? {
         object_server.at(MANAGER_PATH, screen_reader).await?;
@@ -1192,9 +1420,11 @@ mod test {
         FormatDeviceConfig, PlatformConfig, ResetConfig, ScriptConfig, ServiceConfig, StorageConfig,
     };
     use crate::power::TdpLimitingMethod;
+    use crate::proxy::RemoteInterface1Proxy;
     use crate::systemd::test::{MockManager, MockUnit};
     use crate::{path, power, testing};
 
+    use anyhow::{anyhow, ensure};
     use std::num::NonZeroU32;
     use std::os::unix::fs::PermissionsExt;
     use std::path::PathBuf;
@@ -1203,10 +1433,9 @@ mod test {
     use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver};
     use tokio::time::sleep;
     use zbus::object_server::Interface;
-    use zbus::Connection;
 
     struct TestHandle {
-        _handle: testing::TestHandle,
+        handle: testing::TestHandle,
         connection: Connection,
         _rx_job: UnboundedReceiver<JobManagerCommand>,
         rx_tdp: Option<UnboundedReceiver<TdpManagerCommand>>,
@@ -1324,7 +1553,7 @@ mod test {
         sleep(Duration::from_millis(1)).await;
 
         Ok(TestHandle {
-            _handle: handle,
+            handle,
             connection,
             _rx_job: rx_job,
             rx_tdp,
@@ -1603,6 +1832,17 @@ mod test {
         assert!(test_interface_missing::<PerformanceProfile1>(&test.connection).await);
     }
 
+    #[tokio::test]
+    async fn interface_matches_remote_interface1() {
+        let test = start(all_platform_config(), all_device_config())
+            .await
+            .expect("start");
+
+        assert!(test_interface_matches::<RemoteInterface1>(&test.connection)
+            .await
+            .unwrap());
+    }
+
     #[tokio::test]
     async fn interface_matches_storage1() {
         let test = start(all_platform_config(), all_device_config())
@@ -1746,4 +1986,149 @@ mod test {
             .await
             .unwrap());
     }
+
+    async fn test_remote_interface_added<I: RemoteInterface + Interface>(
+        test: &TestHandle,
+        new_conn: &Connection,
+    ) -> Result<()> {
+        let proxy = RemoteInterface1Proxy::builder(&new_conn)
+            .destination(
+                test.connection
+                    .unique_name()
+                    .ok_or(anyhow!("no unique name"))?,
+            )?
+            .build()
+            .await?;
+
+        ensure!(test_remote_interface_missing::<I>(&proxy, test).await?);
+
+        proxy
+            .register_interface(
+                <I as Interface>::name().as_str(),
+                &ObjectPath::try_from("/foo")?,
+            )
+            .await?;
+
+        ensure!(!test_remote_interface_missing::<I>(&proxy, test).await?);
+
+        Ok(())
+    }
+
+    async fn test_remote_interface_missing<I: RemoteInterface + Interface>(
+        proxy: &RemoteInterface1Proxy<'_>,
+        test: &TestHandle,
+    ) -> Result<bool> {
+        Ok(!proxy
+            .remote_interfaces()
+            .await?
+            .contains(&<I as Interface>::name().to_string())
+            && test_interface_missing::<<I as RemoteInterface>::Remote>(&test.connection).await)
+    }
+
+    #[tokio::test]
+    async fn remote_battery_charge_limit1() {
+        let test = start(None, None).await.unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        test_remote_interface_added::<BatteryChargeLimit1>(&test, &new_conn)
+            .await
+            .unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        let proxy = RemoteInterface1Proxy::builder(&new_conn)
+            .destination(test.connection.unique_name().unwrap())
+            .unwrap()
+            .build()
+            .await
+            .unwrap();
+
+        assert!(
+            !test_remote_interface_missing::<BatteryChargeLimit1>(&proxy, &test)
+                .await
+                .unwrap()
+        );
+    }
+
+    #[tokio::test]
+    async fn remote_battery_charge_limit1_dropped() {
+        let test = start(None, None).await.unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        test_remote_interface_added::<BatteryChargeLimit1>(&test, &new_conn)
+            .await
+            .unwrap();
+
+        drop(new_conn);
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        let proxy = RemoteInterface1Proxy::builder(&new_conn)
+            .destination(test.connection.unique_name().unwrap())
+            .unwrap()
+            .build()
+            .await
+            .unwrap();
+
+        assert!(
+            test_remote_interface_missing::<BatteryChargeLimit1>(&proxy, &test)
+                .await
+                .unwrap()
+        );
+    }
+
+    #[tokio::test]
+    async fn remote_battery_charge_limit1_removed() {
+        let test = start(None, None).await.unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        test_remote_interface_added::<BatteryChargeLimit1>(&test, &new_conn)
+            .await
+            .unwrap();
+
+        let proxy = RemoteInterface1Proxy::builder(&new_conn)
+            .destination(test.connection.unique_name().unwrap())
+            .unwrap()
+            .build()
+            .await
+            .unwrap();
+
+        assert!(proxy
+            .unregister_interface(BatteryChargeLimit1::name().as_str())
+            .await
+            .unwrap());
+
+        assert!(
+            test_remote_interface_missing::<BatteryChargeLimit1>(&proxy, &test)
+                .await
+                .unwrap()
+        );
+    }
+
+    #[tokio::test]
+    async fn remote_battery_charge_limit1_not_removed() {
+        let test = start(None, None).await.unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        test_remote_interface_added::<BatteryChargeLimit1>(&test, &new_conn)
+            .await
+            .unwrap();
+
+        let new_conn = test.handle.new_connection().await.unwrap();
+        let proxy = RemoteInterface1Proxy::builder(&new_conn)
+            .destination(test.connection.unique_name().unwrap())
+            .unwrap()
+            .build()
+            .await
+            .unwrap();
+
+        assert!(proxy
+            .unregister_interface(BatteryChargeLimit1::name().as_str())
+            .await
+            .is_err());
+
+        assert!(
+            !test_remote_interface_missing::<BatteryChargeLimit1>(&proxy, &test)
+                .await
+                .unwrap()
+        );
+    }
 }

steamos-manager/src/testing.rs

@@ -185,6 +185,14 @@ impl TestHandle {
     pub async fn dbus_address(&self) -> Option<Address> {
         (*self.test.dbus_address.lock().await).clone()
     }
+
+    pub async fn new_connection(&self) -> Result<Connection> {
+        Ok(
+            Builder::address(self.dbus_address().await.ok_or(anyhow!("No address"))?)?
+                .build()
+                .await?,
+        )
+    }
 }
 
 impl Drop for TestHandle {