From 50ff158c50b32314cd219a2e3d1edc7a95290f4f Mon Sep 17 00:00:00 2001
From: Michael Bestas <mikeioannina@cyanogenmod.org>
Date: Mon, 25 Jan 2016 03:27:52 +0200
Subject: recovery: Add wipe system partition option

Change-Id: Id606cef249a7464037443de6265055803c290d82
---
 device.cpp   |  2 ++
 device.h     |  1 +
 recovery.cpp | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/device.cpp b/device.cpp
index 95608d6..0186d5b 100644
--- a/device.cpp
+++ b/device.cpp
@@ -68,6 +68,7 @@ static const char* ADVANCED_MENU_NAMES[] = {
 #endif
 #ifndef RELEASE_BUILD
     "Mount /system",
+    "Wipe system partition",
 #endif
     "View recovery logs",
     "Power off",
@@ -82,6 +83,7 @@ static const menu_entry ADVANCED_MENU_ENTRIES[] = {
 #endif
 #ifndef RELEASE_BUILD
     { ACTION_INVOKE, { .action = Device::MOUNT_SYSTEM } },
+    { ACTION_INVOKE, { .action = Device::WIPE_SYSTEM } },
 #endif
     { ACTION_INVOKE, { .action = Device::VIEW_RECOVERY_LOGS } },
     { ACTION_INVOKE, { .action = Device::SHUTDOWN } },
diff --git a/device.h b/device.h
index 98427a2..8ff541a 100644
--- a/device.h
+++ b/device.h
@@ -74,6 +74,7 @@ class Device : public VoldWatcher {
         SHUTDOWN,
         VIEW_RECOVERY_LOGS,
         MOUNT_SYSTEM,
+        WIPE_SYSTEM,
     };
 
     // Return the list of menu items (an array of strings,
diff --git a/recovery.cpp b/recovery.cpp
index c13a689..03425dc 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -906,6 +906,20 @@ static bool wipe_cache(bool should_confirm, Device* device) {
     return success;
 }
 
+// Return true on success.
+static bool wipe_system(Device* device) {
+    if (!yes_no(device, "Wipe system?", "  THIS CAN NOT BE UNDONE!")) {
+        return false;
+    }
+
+    modified_flash = true;
+
+    ui->Print("\n-- Wiping system...\n");
+    bool success = erase_volume("/system");
+    ui->Print("System wipe %s.\n", success ? "complete" : "failed");
+    return success;
+}
+
 static void choose_recovery_file(Device* device) {
     // "Back" + KEEP_LOG_COUNT * 2 + terminating nullptr entry
     char* entries[1 + KEEP_LOG_COUNT * 2 + 1];
@@ -1163,6 +1177,10 @@ prompt_and_wait(Device* device, int status) {
                     }
 
                     break;
+
+                case Device::WIPE_SYSTEM:
+                    wipe_system(device);
+                    break;
             }
             if (status == Device::kRefresh) {
                 status = 0;
-- 
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