add archive for last 10 builds

archive_elf.py

@@ -0,0 +1,45 @@
+"""
+PlatformIO post-build script: archive firmware.elf files.
+
+Copies firmware.elf to elf_archive/ with a timestamp after each build.
+Keeps only the last 10 files to avoid filling up disk space.
+
+Usage in platformio.ini
+-----------------------
+    extra_scripts = post:archive_elf.py
+"""
+
+Import("env")
+
+import os
+import shutil
+from datetime import datetime
+
+MAX_ARCHIVES = 10
+ARCHIVE_DIR = os.path.join(env.subst("$PROJECT_DIR"), "elf_archive")
+
+
+def archive_elf(source, target, env):
+    elf_path = os.path.join(env.subst("$BUILD_DIR"), "firmware.elf")
+    if not os.path.isfile(elf_path):
+        print("[archive_elf] firmware.elf not found, skipping.")
+        return
+
+    os.makedirs(ARCHIVE_DIR, exist_ok=True)
+
+    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+    dest = os.path.join(ARCHIVE_DIR, f"firmware_{timestamp}.elf")
+    shutil.copy2(elf_path, dest)
+    print(f"[archive_elf] Saved {dest}")
+
+    # Keep only the last MAX_ARCHIVES files
+    files = sorted(
+        [f for f in os.listdir(ARCHIVE_DIR) if f.endswith(".elf")],
+    )
+    while len(files) > MAX_ARCHIVES:
+        old = os.path.join(ARCHIVE_DIR, files.pop(0))
+        os.remove(old)
+        print(f"[archive_elf] Removed old archive {old}")
+
+
+env.AddPostAction("$BUILD_DIR/firmware.elf", archive_elf)