Auto-create SPIFFS partition if not found.

The heuristics could probably be improved a lot, but this is better than
nothing at least.

components/platform/include/platform.h

@@ -111,6 +111,13 @@ typedef struct {
  */
 bool platform_partition_info (uint8_t idx, platform_partition_t *info);
 
+/**
+ * Appends a partition entry to the partition table, if possible.
+ * Intended for auto-creation of a SPIFFS partition.
+ * @param info The partition definition to append.
+ * @returns True if the partition could be added, false if not.
+ */
+bool platform_partition_add (const platform_partition_t *info);
 
 
 // *****************************************************************************

components/platform/platform_partition.c

@@ -34,6 +34,7 @@
 #include "platform.h"
 
 #include <string.h>
+#include <stdlib.h>
 #include "../../bootloader/src/main/bootloader_config.h"
 #include "esp_spi_flash.h"
 
@@ -66,3 +67,38 @@ bool platform_partition_info (uint8_t idx, platform_partition_t *info)
   return true;
 }
 
+
+bool platform_partition_add (const platform_partition_t *info)
+{
+  partition_info_t *part_table = (partition_info_t *)malloc(SPI_FLASH_SEC_SIZE);
+  if (!part_table)
+    return false;
+  esp_err_t err =
+    spi_flash_read (PARTITION_ADD, (uint32_t *)part_table, SPI_FLASH_SEC_SIZE);
+  if (err != ESP_OK)
+    return false;
+
+  uint8_t idx = 0;
+  for (; possible_idx (idx); ++idx)
+    if (part_table[idx].magic != PARTITION_MAGIC)
+      break;
+
+  if (possible_idx (idx))
+  {
+    partition_info_t *slot = &part_table[idx];
+    slot->magic = PARTITION_MAGIC;
+    slot->type = info->type;
+    slot->subtype = info->subtype;
+    slot->pos.offset = info->offs;
+    slot->pos.size = info->size;
+    memcpy (slot->label, info->label, sizeof (slot->label));
+    memset (slot->reserved, 0xff, sizeof (slot->reserved));
+    err = spi_flash_erase_sector (PARTITION_ADD / SPI_FLASH_SEC_SIZE);
+    if (err == ESP_OK)
+      err = spi_flash_write (
+        PARTITION_ADD, (uint32_t *)part_table, SPI_FLASH_SEC_SIZE);
+  }
+
+  free (part_table);
+  return err == ESP_OK;
+}

components/spiffs/spiffs.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdbool.h>
+#include <string.h>
 #include "platform.h"
 #include "flash_api.h"
 #include "spiffs.h"
@@ -53,6 +54,7 @@ The small 4KB sectors allow for greater flexibility in applications th
 static bool get_spiffs_partition (spiffs_config *cfg)
 {
   platform_partition_t info;
+  uint32_t next_free_offs = 0;
   uint8_t i = 0;
   while (platform_partition_info (i, &info))
   {
@@ -64,11 +66,34 @@ static bool get_spiffs_partition (spiffs_config *cfg)
       return true;
     }
     else
+    {
       ++i;
+      if ((info.offs + info.size) > next_free_offs)
+        next_free_offs = info.offs + info.size;
+    }
+  }
+  // Attempt to append a spiffs partition
+  NODE_ERR("No filesystem partition found, attempting to create it...\n");
+  info.type = PLATFORM_PARTITION_TYPE_NODEMCU;
+  info.subtype = PLATFORM_PARTITION_SUBTYPE_NODEMCU_SPIFFS;
+  strcpy (info.label, "spiffs");
+  info.offs = cfg->phys_addr = next_free_offs;
+  info.size = cfg->phys_size = flash_safe_get_size_byte () - info.offs;
+  if (info.size <= 0)
+  {
+    NODE_ERR("No space available at end of flash, can't add fs partition!\n");
+    return false;
+  }
+  if (platform_partition_add (&info))
+  {
+    NODE_ERR("Ok.\n");
+    return true;
+  }
+  else
+  {
+    NODE_ERR("Error rewriting partition table!\n");
+    return false;
   }
-  // TODO: try to automatically append a spiffs partition; needs support
-  // over in platform_partition.c for that too
-  return false;
 }