Remove support for converting from FDE to FBE

Devices that launched with Android 10 or later require FBE (File Based
Encryption) from the beginning, so there's no need to support converting
to FBE after the fact anymore.  This was only ever a developer option,
so it probably wasn't used much.  And in any case, it's not used
anymore, as isConvertibleToFBE() is hard-coded to return false.  Besides
the fact that FBE has been required for several releases now, this
functionality was only ever available on devices that use FDE (Full Disk
Encryption), but FDE support has been removed from Android.

Therefore, remove this unused code.

Bug: 208476087
Change-Id: I1f56c8e05fb3fba09aab4bf5f8609b0f552b8999

4 files changed, 10 insertions, 34 deletions

diff --git a/install/adb_install.cpp b/install/adb_install.cpp
index 5cba7b67..b12e5294 100644
--- a/install/adb_install.cpp
+++ b/install/adb_install.cpp
@@ -369,7 +369,7 @@ InstallResult ApplyFromAdb(Device* device, bool rescue_mode, Device::BuiltinActi
         "to the device with \"adb sideload <filename>\"...\n");
   } else {
     command_map.emplace(MinadbdCommand::kWipeData, [&device]() {
-      bool result = WipeData(device, false);
+      bool result = WipeData(device);
       return std::make_pair(result, true);
     });
     command_map.emplace(MinadbdCommand::kNoOp, []() { return std::make_pair(true, true); });
diff --git a/install/include/install/wipe_data.h b/install/include/install/wipe_data.h
index b34891f3..42cad871 100644
--- a/install/include/install/wipe_data.h
+++ b/install/include/install/wipe_data.h
@@ -27,4 +27,4 @@ struct selabel_handle;
 bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm);
 
 // Returns true on success.
-bool WipeData(Device* device, bool convert_fbe);
+bool WipeData(Device* device);
diff --git a/install/install.cpp b/install/install.cpp
index 811bcb02..83f3cad6 100644
--- a/install/install.cpp
+++ b/install/install.cpp
@@ -347,7 +347,7 @@ static bool PerformPowerwashIfRequired(ZipArchiveHandle zip, Device *device) {
   const auto payload_properties = ExtractPayloadProperties(zip);
   if (payload_properties.find("POWERWASH=1") != std::string::npos) {
     LOG(INFO) << "Payload properties has POWERWASH=1, wiping userdata...";
-    return WipeData(device, true);
+    return WipeData(device);
   }
   return true;
 }
diff --git a/install/wipe_data.cpp b/install/wipe_data.cpp
index 4eecf72c..024c1e1d 100644
--- a/install/wipe_data.cpp
+++ b/install/wipe_data.cpp
@@ -16,9 +16,7 @@
 
 #include "install/wipe_data.h"
 
-#include <stdio.h>
 #include <string.h>
-#include <sys/stat.h>
 
 #include <functional>
 #include <vector>
@@ -37,9 +35,8 @@ constexpr const char* CACHE_ROOT = "/cache";
 constexpr const char* DATA_ROOT = "/data";
 constexpr const char* METADATA_ROOT = "/metadata";
 
-static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
+static bool EraseVolume(const char* volume, RecoveryUI* ui) {
   bool is_cache = (strcmp(volume, CACHE_ROOT) == 0);
-  bool is_data = (strcmp(volume, DATA_ROOT) == 0);
 
   std::vector<saved_log_file> log_files;
   if (is_cache) {
@@ -52,28 +49,7 @@ static bool EraseVolume(const char* volume, RecoveryUI* ui, bool convert_fbe) {
 
   ensure_path_unmounted(volume);
 
-  int result;
-  if (is_data && convert_fbe) {
-    constexpr const char* CONVERT_FBE_DIR = "/tmp/convert_fbe";
-    constexpr const char* CONVERT_FBE_FILE = "/tmp/convert_fbe/convert_fbe";
-    // Create convert_fbe breadcrumb file to signal init to convert to file based encryption, not
-    // full disk encryption.
-    if (mkdir(CONVERT_FBE_DIR, 0700) != 0) {
-      PLOG(ERROR) << "Failed to mkdir " << CONVERT_FBE_DIR;
-      return false;
-    }
-    FILE* f = fopen(CONVERT_FBE_FILE, "wbe");
-    if (!f) {
-      PLOG(ERROR) << "Failed to convert to file encryption";
-      return false;
-    }
-    fclose(f);
-    result = format_volume(volume, CONVERT_FBE_DIR);
-    remove(CONVERT_FBE_FILE);
-    rmdir(CONVERT_FBE_DIR);
-  } else {
-    result = format_volume(volume);
-  }
+  int result = format_volume(volume);
 
   if (is_cache) {
     RestoreLogFilesAfterFormat(log_files);
@@ -97,12 +73,12 @@ bool WipeCache(RecoveryUI* ui, const std::function<bool()>& confirm_func) {
   ui->SetBackground(RecoveryUI::ERASING);
   ui->SetProgressType(RecoveryUI::INDETERMINATE);
 
-  bool success = EraseVolume("/cache", ui, false);
+  bool success = EraseVolume("/cache", ui);
   ui->Print("Cache wipe %s.\n", success ? "complete" : "failed");
   return success;
 }
 
-bool WipeData(Device* device, bool convert_fbe) {
+bool WipeData(Device* device) {
   RecoveryUI* ui = device->GetUI();
   ui->Print("\n-- Wiping data...\n");
   ui->SetBackground(RecoveryUI::ERASING);
@@ -115,13 +91,13 @@ bool WipeData(Device* device, bool convert_fbe) {
 
   bool success = device->PreWipeData();
   if (success) {
-    success &= EraseVolume(DATA_ROOT, ui, convert_fbe);
+    success &= EraseVolume(DATA_ROOT, ui);
     bool has_cache = volume_for_mount_point("/cache") != nullptr;
     if (has_cache) {
-      success &= EraseVolume(CACHE_ROOT, ui, false);
+      success &= EraseVolume(CACHE_ROOT, ui);
     }
     if (volume_for_mount_point(METADATA_ROOT) != nullptr) {
-      success &= EraseVolume(METADATA_ROOT, ui, false);
+      success &= EraseVolume(METADATA_ROOT, ui);
     }
   }
   if (success) {