include SHA in version strings

bin/platformio-custom.py

@@ -1,16 +1,37 @@
 
+
+import subprocess
+import configparser
+import traceback
+import sys
+
 Import("projenv")
 
-import configparser
 prefsLoc = projenv["PROJECT_DIR"] + "/version.properties"
 config = configparser.RawConfigParser()
 config.read(prefsLoc)
 version = dict(config.items('VERSION'))
-verStr = "{}.{}.{}".format(version["major"], version["minor"], version["build"])
+
+# Try to find current build SHA if if the workspace is clean.  This could fail if git is not installed
+try:
+    sha = subprocess.check_output(
+        ['git', 'rev-parse', '--short', 'HEAD']).decode("utf-8").strip()
+    isDirty = subprocess.check_output(
+        ['git', 'diff', 'HEAD']).decode("utf-8").strip()
+    suffix = sha
+    if isDirty:
+        suffix = sha + "-dirty"
+    verStr = "{}.{}.{}.{}".format(
+        version["major"], version["minor"], version["build"], suffix)
+except:
+    print("Unexpected error:", sys.exc_info()[0])
+    traceback.print_exc()
+    verStr = "{}.{}.{}".format(
+        version["major"], version["minor"], version["build"])
 
 print("Using meshtastic platform-custom.py, firmare version " + verStr)
 
 # General options that are passed to the C and C++ compilers
 projenv.Append(CCFLAGS=[
     "-DAPP_VERSION=" + verStr
-    ])
+])