Update name for LittleFS builds; Update readme

README.md

@@ -52,6 +52,9 @@ After saving and restarting, you'll be ready to configure your hardware through
 ### OTA updates
 You can download new versions from the **Artifacts** section [here](https://github.com/floatplane/MitsuQTT/actions/workflows/build.yml?query=branch%3Amain). Pick the download for your hardware type, unzip it on your desktop, and use the "Firmware Update" page to upload the BIN file to your hardware.
 
+#### Should I use the LittleFS or SPIFFS version?
+LittleFS should be the default for all new installs. SPIFFS is supported for backwards compatibility when upgrading from older versions, but support will be removed at some point. 
+
 ---
 ## Monitoring
 MitsuQTT exposes a `/metrics.json` endpoint that can be used to directly interrogate the state of the hardware. You can connect this to a tool like [Uptime Kuma](https://github.com/louislam/uptime-kuma) to watch for changes and publish alerts:

set_output_filename.py

@@ -6,5 +6,8 @@
     # TODO(floatplane) this build date format is duplicated in platformio.ini
     build_date = subprocess.check_output(["date", "-u", r"+%Y.%m.%d"]).decode("utf-8").strip()
     git_commit = subprocess.check_output(["git", "rev-parse", "--short", "HEAD"]).decode("utf-8").strip()
+    using_spiffs = 'SPIFFS' in env['PIOENV']
+    print('Using SPIFFS: ' + ('YES' if using_spiffs else 'NO'))
+    filesystem = '' if using_spiffs else '-LittleFS'
 
-    env.Replace(PROGNAME=("mitsuqtt-%s-%s-%s" % (env['PIOENV'], build_date, git_commit)))
+    env.Replace(PROGNAME=("mitsuqtt-%s%s-%s-%s" % (env['PIOENV'], filesystem, build_date, git_commit)))