Create system_utils component

Somewhat of a 'misc' component; handles early initialization, checking
for first boot and rebooting.

components/system_utils/system_utils.c

@@ -0,0 +1,79 @@
+
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) Camden Dixie O'Brien
+ */
+
+#include "system_utils.h"
+
+#include "fatal.h"
+#include "time_storage.h"
+
+#include "esp_log.h"
+#include "esp_system.h"
+#include "nvs_flash.h"
+
+#define TAG "System utils"
+
+#define NVS_NAMESPACE "system-utils"
+#define BOOTED_FLAG_KEY "booted"
+
+static bool first_boot;
+
+static void test_first_boot(void)
+{
+	esp_err_t error;
+	nvs_handle_t handle;
+	error = nvs_open(NVS_NAMESPACE, NVS_READWRITE, &handle);
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error opening NVS store namespace: %02x", error);
+		first_boot = false;
+		return;
+	}
+
+	uint8_t tmp;
+	error = nvs_get_u8(handle, BOOTED_FLAG_KEY, &tmp);
+	if (error == ESP_OK) {
+		first_boot = false;
+	} else if (error == ESP_ERR_NVS_NOT_FOUND) {
+		ESP_LOGI(TAG, "First boot of system");
+		first_boot = true;
+		error = nvs_set_u8(handle, BOOTED_FLAG_KEY, 1);
+		if (error != ESP_OK)
+			ESP_LOGE(TAG, "Error setting booted flag: %02x", error);
+	} else {
+		ESP_LOGE(TAG, "Error getting booted flag: %02x", error);
+		first_boot = false;
+	}
+
+	nvs_close(handle);
+}
+
+void early_init()
+{
+	esp_err_t error = nvs_flash_init();
+	if (error == ESP_ERR_NVS_NO_FREE_PAGES
+	    || error == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+		ESP_LOGI(TAG, "NVS partition full or outdated; erasing");
+		(void)nvs_flash_erase();
+		error = nvs_flash_init();
+	}
+	if (error != ESP_OK) {
+		ESP_LOGE(TAG, "Error initializing NVS store: %04x", error);
+		FATAL();
+	}
+
+	test_first_boot();
+}
+
+bool is_first_boot()
+{
+	return first_boot;
+}
+
+void reboot()
+{
+	ESP_LOGI(TAG, "Rebooting system");
+	time_storage_save();
+	esp_restart();
+}