hash target files and pass as define

script/post_script.py

@@ -9,10 +9,10 @@
 Import("env")
 
 try:
-    from target_inject import process_elf_action, inject_target, copy_hex
+    from target_inject import target_hash, process_elf_action, inject_target, copy_hex
 except ImportError:
     env.Execute("$PYTHONEXE -m pip install pyelftools pyyaml cbor2")
-    from target_inject import process_elf_action, inject_target, copy_hex
+    from target_inject import target_hash, process_elf_action, inject_target, copy_hex
 
 
 def before_upload(source, target, env):
@@ -30,6 +30,10 @@ def before_upload(source, target, env):
         while option in env[scope]:
             env[scope].remove(option)
 
+env.Append(
+    CPPDEFINES=[("TARGET_HASH", target_hash(env))],
+)
+
 objcopy_args = [
     "$OBJCOPY",
     "-S",

script/pre_script.py

@@ -1,6 +1,7 @@
 # pylint: disable=missing-docstring,redefined-outer-name,unspecified-encoding
 
 import os
+import threading
 
 Import("env")
 
@@ -70,18 +71,23 @@ def touch(fname, times=None):
         os.utime(fname, times)
 
 
-target_remote = "https://github.com/BossHobby/Targets.git"
-target_dir = os.path.join(env["PROJECT_DIR"], "targets")
+def fetch_thread():
+    target_remote = "https://github.com/BossHobby/Targets.git"
+    target_dir = os.path.join(env["PROJECT_DIR"], "targets")
 
-if not os.path.exists(target_dir):
-    porcelain.clone(target_remote, target=target_dir, branch="targets")
-    touch(os.path.join(env["PROJECT_DIR"], "platformio.ini"))
-else:
-    target_repo = porcelain.open_repo(target_dir)
-    target_ref_before = porcelain.describe(target_repo)
-    porcelain.fetch(target_repo)
-    porcelain.checkout_branch(target_repo, "targets")
-    target_ref_after = porcelain.describe(target_repo)
-
-    if target_ref_before != target_ref_after:
+    if not os.path.exists(target_dir):
+        porcelain.clone(target_remote, target=target_dir, branch="targets")
         touch(os.path.join(env["PROJECT_DIR"], "platformio.ini"))
+    else:
+        target_repo = porcelain.open_repo(target_dir)
+        target_ref_before = porcelain.describe(target_repo)
+        porcelain.fetch(target_repo)
+        porcelain.checkout_branch(target_repo, "targets")
+        target_ref_after = porcelain.describe(target_repo)
+
+        if target_ref_before != target_ref_after:
+            touch(os.path.join(env["PROJECT_DIR"], "platformio.ini"))
+
+
+t = threading.Thread(target=fetch_thread)
+t.start()

script/target_inject.py

@@ -4,6 +4,7 @@
 import shutil
 import cbor2
 import yaml
+import hashlib
 
 from elftools.elf.elffile import ELFFile
 
@@ -71,3 +72,15 @@ def copy_hex(source, target, env):
         env.subst("$BUILD_DIR/${PROGNAME}.hex"),
         env.subst(os.path.join("output", hex_name)),
     )
+
+
+def target_hash(env):
+    target_yaml = env.subst("targets/${PIOENV}.yaml")
+    if not os.path.isfile(target_yaml):
+        return ""
+
+    md5 = hashlib.md5()
+    with open(target_yaml, "rb") as f:
+        for chunk in iter(lambda: f.read(2**20), b""):
+            md5.update(chunk)
+    return md5.hexdigest()