From aaba77ede8a3481e4a2027d2a97df5abb1b8742c Mon Sep 17 00:00:00 2001
From: Peter Cai <peter@typeblog.net>
Date: Mon, 11 Oct 2021 19:04:24 -0400
Subject: [PATCH] gsi: reconcile system fingerprint / device model with vendor

---
 BoardConfigCommon.mk           |  5 +++
 device.mk                      |  5 +++
 init/Android.bp                |  7 ++++
 init/init_gsi.cpp              | 61 ++++++++++++++++++++++++++++++++++
 init/init_gsi.rc               |  5 +++
 peter_gsi_arm64/BoardConfig.mk |  1 +
 resetprop/Android.bp           |  1 +
 sepolicy/private/init.te       |  1 +
 8 files changed, 86 insertions(+)
 create mode 100644 BoardConfigCommon.mk
 create mode 100644 init/Android.bp
 create mode 100644 init/init_gsi.cpp
 create mode 100644 init/init_gsi.rc
 create mode 100644 sepolicy/private/init.te

diff --git a/BoardConfigCommon.mk b/BoardConfigCommon.mk
new file mode 100644
index 0000000..b15327e
--- /dev/null
+++ b/BoardConfigCommon.mk
@@ -0,0 +1,5 @@
+DEVICE_PATH := device/peter/gsi
+
+# Sepolicy
+SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS += $(DEVICE_PATH)/sepolicy/private
+SELINUX_IGNORE_NEVERALLOWS := true
diff --git a/device.mk b/device.mk
index 977f91a..e6173b6 100644
--- a/device.mk
+++ b/device.mk
@@ -29,3 +29,8 @@ PRODUCT_PROPERTY_OVERRIDES += \
 # Resetprop
 PRODUCT_PACKAGES += \
     resetprop_sys
+
+# Init
+PRODUCT_PACKAGES += \
+    init_gsi
+
diff --git a/init/Android.bp b/init/Android.bp
new file mode 100644
index 0000000..724b1f6
--- /dev/null
+++ b/init/Android.bp
@@ -0,0 +1,7 @@
+cc_binary {
+    name: "init_gsi",
+    system_ext_specific: true,
+    srcs: ["init_gsi.cpp"],
+    shared_libs: ["libbase", "libdl", "libutils"],
+    init_rc: ["init_gsi.rc"],
+}
diff --git a/init/init_gsi.cpp b/init/init_gsi.cpp
new file mode 100644
index 0000000..cb3eff2
--- /dev/null
+++ b/init/init_gsi.cpp
@@ -0,0 +1,61 @@
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+
+#include <string>
+#include <iostream>
+
+#include <sys/wait.h>
+
+using namespace android;
+using namespace std;
+
+template<typename... Args>
+void fork_execl(Args... args) {
+    int pid, status;
+    if ((pid = fork()) == 0) {
+        execl(args..., nullptr);
+    } else {
+        waitpid(pid, &status, 0);
+    }
+}
+
+void override_ro_prop(string prefix, string source, string postfix, string value) {
+    if (value.length() == 0) return;
+    
+    std::string prop = prefix;
+    
+    if (source.length() > 0) {
+        prop += ".";
+        prop += source;
+    }
+    
+    prop += "." + postfix;
+    std::cout << prop << std::endl;
+    std::cout << value << std::endl;
+    
+    fork_execl("/system/system_ext/bin/resetprop_sys", "resetprop_sys", prop.c_str(), value.c_str());
+}
+
+std::string RO_PROP_SOURCES[] = {
+    "", "product", "odm", "vendor", "system_ext", "system", "bootimage",
+};
+
+int main() {
+    string device = base::GetProperty("ro.product.vendor.device", "");
+    string model = base::GetProperty("ro.product.vendor.model", "");
+    string name = base::GetProperty("ro.product.vendor.name", "");
+    string brand = base::GetProperty("ro.product.vendor.brand", "");
+    string manufacturer = base::GetProperty("ro.product.vendor.manufacturer", "");
+    string fingerprint = base::GetProperty("ro.vendor.build.fingerprint", "");
+    
+    for (const auto& source : RO_PROP_SOURCES) {
+        override_ro_prop("ro.product", source, "device", device);
+        override_ro_prop("ro.product", source, "model", model);
+        override_ro_prop("ro.product", source, "name", name);
+        override_ro_prop("ro.product", source, "brand", brand);
+        override_ro_prop("ro.product", source, "manufacturer", manufacturer);
+        override_ro_prop("ro", source, "build.fingerprint", fingerprint);
+    }
+    
+    return 0;
+}
diff --git a/init/init_gsi.rc b/init/init_gsi.rc
new file mode 100644
index 0000000..bb7fb89
--- /dev/null
+++ b/init/init_gsi.rc
@@ -0,0 +1,5 @@
+service init_gsi /system/system_ext/bin/init_gsi
+    class core
+    user root
+    group root
+    seclabel u:r:init:s0
diff --git a/peter_gsi_arm64/BoardConfig.mk b/peter_gsi_arm64/BoardConfig.mk
index 3cbb176..2c4f524 100644
--- a/peter_gsi_arm64/BoardConfig.mk
+++ b/peter_gsi_arm64/BoardConfig.mk
@@ -1 +1,2 @@
 include build/make/target/board/generic_arm64/BoardConfig.mk
+include device/peter/gsi/BoardConfigCommon.mk
diff --git a/resetprop/Android.bp b/resetprop/Android.bp
index 1cc27d7..c1e2341 100644
--- a/resetprop/Android.bp
+++ b/resetprop/Android.bp
@@ -1,5 +1,6 @@
 cc_binary {
 	name: "resetprop_sys",
+	system_ext_specific: true,
 	srcs: [
 		//nanopb
 		"Magisk/native/jni/external/nanopb/pb_common.c",
diff --git a/sepolicy/private/init.te b/sepolicy/private/init.te
new file mode 100644
index 0000000..492567e
--- /dev/null
+++ b/sepolicy/private/init.te
@@ -0,0 +1 @@
+allow init system_file:file execute_no_trans;