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/apex/Android.bp b/microfuchsia/apex/Android.bp
new file mode 100644
index 0000000..eddda9f
--- /dev/null
+++ b/microfuchsia/apex/Android.bp
@@ -0,0 +1,55 @@
+// 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.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+apex {
+    name: "com.android.microfuchsia",
+    manifest: "manifest.json",
+    key: "com.android.microfuchsia.key",
+
+    // Allows us to specify a file_contexts in our own repository.
+    system_ext_specific: true,
+    file_contexts: "com.android.microfuchsia-file_contexts",
+
+    updatable: false,
+    future_updatable: false,
+    platform_apis: true,
+
+    binaries: [
+        // A daemon that starts on bootup that launches microfuchsia in AVF.
+        "microfuchsiad",
+    ],
+
+    prebuilts: [
+        // An init script to launch the microfuchsiad daemon on bootup which
+        // launches the microfuchsia VM in AVF.
+        "com.android.microfuchsia.init.rc",
+    ],
+}
+
+apex_key {
+    name: "com.android.microfuchsia.key",
+    public_key: "com.android.microfuchsia.avbpubkey",
+    private_key: "com.android.microfuchsia.pem",
+}
+
+prebuilt_etc {
+    name: "com.android.microfuchsia.init.rc",
+    src: "microfuchsia.rc",
+    filename: "init.rc",
+    installable: false,
+}
diff --git a/microfuchsia/apex/com.android.microfuchsia-file_contexts b/microfuchsia/apex/com.android.microfuchsia-file_contexts
new file mode 100644
index 0000000..13d7286
--- /dev/null
+++ b/microfuchsia/apex/com.android.microfuchsia-file_contexts
@@ -0,0 +1,2 @@
+(/.*)?                   u:object_r:system_file:s0
+/bin/microfuchsiad       u:object_r:microfuchsiad_exec:s0
diff --git a/microfuchsia/apex/com.android.microfuchsia.avbpubkey b/microfuchsia/apex/com.android.microfuchsia.avbpubkey
new file mode 100644
index 0000000..10d4b88
--- /dev/null
+++ b/microfuchsia/apex/com.android.microfuchsia.avbpubkey
Binary files differ
diff --git a/microfuchsia/apex/com.android.microfuchsia.pem b/microfuchsia/apex/com.android.microfuchsia.pem
new file mode 100644
index 0000000..541fa80
--- /dev/null
+++ b/microfuchsia/apex/com.android.microfuchsia.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
diff --git a/microfuchsia/apex/manifest.json b/microfuchsia/apex/manifest.json
new file mode 100644
index 0000000..b7ea23b
--- /dev/null
+++ b/microfuchsia/apex/manifest.json
@@ -0,0 +1,4 @@
+{
+  "name": "com.android.microfuchsia",
+  "version": 1
+}
diff --git a/microfuchsia/apex/microfuchsia.rc b/microfuchsia/apex/microfuchsia.rc
new file mode 100644
index 0000000..2b19ed3
--- /dev/null
+++ b/microfuchsia/apex/microfuchsia.rc
@@ -0,0 +1,22 @@
+# 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.
+
+service microfuchsiad /apex/com.android.microfuchsia/bin/microfuchsiad
+    class main
+    user root
+    group system
+    # We need SYS_NICE in order to allow the crosvm child process to use it.
+    # (b/322197421). composd itself never uses it (and isn't allowed to by
+    # SELinux).
+    capabilities SYS_NICE