Revert^2 "Add microfuchsia apex that runs in AVF on bootup"

4ae215a64209cfbb0ae4fb2d484a0fb4fa4afc53

The old change is PS1.

The fix involves using libc::c_char and casting to a u8 on x86
architectures.

Test: m com.android.microfuchsia for arm and x86
Change-Id: Ideccd80b4f6a812c1638b31a7b4ad666a5a411b7
diff --git a/microfuchsia/microfuchsiad/src/main.rs b/microfuchsia/microfuchsiad/src/main.rs
new file mode 100644
index 0000000..ec290cc
--- /dev/null
+++ b/microfuchsia/microfuchsiad/src/main.rs
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//! A daemon that can be launched on bootup that runs microfuchsia in AVF.
+//! An on-demand binder service is also prepared in case we want to communicate with the daemon in
+//! the future.
+
+mod instance_manager;
+mod instance_starter;
+mod service;
+
+use crate::instance_manager::InstanceManager;
+use anyhow::{Context, Result};
+use binder::{register_lazy_service, ProcessState};
+use log::{error, info};
+
+#[allow(clippy::eq_op)]
+fn try_main() -> Result<()> {
+    let debuggable = env!("TARGET_BUILD_VARIANT") != "user";
+    let log_level = if debuggable { log::LevelFilter::Debug } else { log::LevelFilter::Info };
+    android_logger::init_once(
+        android_logger::Config::default().with_tag("microfuchsiad").with_max_level(log_level),
+    );
+
+    ProcessState::start_thread_pool();
+
+    let virtmgr =
+        vmclient::VirtualizationService::new().context("Failed to spawn VirtualizationService")?;
+    let virtualization_service =
+        virtmgr.connect().context("Failed to connect to VirtualizationService")?;
+
+    let instance_manager = InstanceManager::new(virtualization_service);
+    let service = service::new_binder(instance_manager);
+    register_lazy_service("android.system.microfuchsiad", service.as_binder())
+        .context("Registering microfuchsiad service")?;
+
+    info!("Registered services, joining threadpool");
+    ProcessState::join_thread_pool();
+
+    info!("Exiting");
+    Ok(())
+}
+
+fn main() {
+    if let Err(e) = try_main() {
+        error!("{:?}", e);
+        std::process::exit(1)
+    }
+}