From 1895ef1c3e667910d3eb86053ddbd7c8dcdaad98 Mon Sep 17 00:00:00 2001
From: Mat931 <49403702+Mat931@users.noreply.github.com>
Date: Sun, 3 May 2026 20:03:38 +0200
Subject: [PATCH] Restore 'Used size' of running app in dump_config

---
 esphome/components/esphome/ota/ota_esphome.cpp | 12 ++++++------
 esphome/components/esphome/ota/ota_esphome.h   |  4 ++++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/esphome/components/esphome/ota/ota_esphome.cpp b/esphome/components/esphome/ota/ota_esphome.cpp
index 00089c000d..369f39e22b 100644
--- a/esphome/components/esphome/ota/ota_esphome.cpp
+++ b/esphome/components/esphome/ota/ota_esphome.cpp
@@ -87,6 +87,10 @@ void ESPHomeOTAComponent::setup() {
   // no wakes fire and loop() falls back to the self-disable safety net.
   esphome_fast_select_set_ota_listener_sock(esphome_lwip_get_sock(this->server_->get_fd()));
 #endif
+
+#ifdef USE_OTA_PARTITIONS
+  ota::get_running_app_position(this->running_app_offset_, this->running_app_size_);
+#endif
 }
 
 void ESPHomeOTAComponent::dump_config() {
@@ -101,16 +105,12 @@ void ESPHomeOTAComponent::dump_config() {
   }
 #endif
 #ifdef USE_OTA_PARTITIONS
-  // running_app_part can be nullptr if the partition cache was unloaded by a prior aborted
-  // partition-table OTA; surface zeros instead of dereferencing.
-  const esp_partition_t *running_app_part = esp_ota_get_running_partition();
   ESP_LOGCONFIG(TAG,
                 "  Partition access allowed\n"
                 "  Running app:\n"
                 "    Partition address: 0x%X\n"
-                "    Partition size: 0x%X bytes",
-                running_app_part != nullptr ? running_app_part->address : 0u,
-                running_app_part != nullptr ? running_app_part->size : 0u);
+                "    Used size: %zu bytes (0x%X)",
+                this->running_app_offset_, this->running_app_size_, this->running_app_size_);
 
 #ifdef USE_ESP32
   ESP_LOGCONFIG(TAG, "  Partition table:");
diff --git a/esphome/components/esphome/ota/ota_esphome.h b/esphome/components/esphome/ota/ota_esphome.h
index 5043bc33ef..0053ca6969 100644
--- a/esphome/components/esphome/ota/ota_esphome.h
+++ b/esphome/components/esphome/ota/ota_esphome.h
@@ -98,6 +98,10 @@ class ESPHomeOTAComponent final : public ota::OTAComponent {
 
   uint32_t client_connect_time_{0};
   static constexpr size_t HANDSHAKE_BUF_SIZE = 5;
+#ifdef USE_OTA_PARTITIONS
+  uint32_t running_app_offset_{0};
+  size_t running_app_size_{0};
+#endif
   uint16_t port_;
   uint8_t handshake_buf_[HANDSHAKE_BUF_SIZE];
   OTAState ota_state_{OTAState::IDLE};