fix: remove python dependency for a build script

src/Makefile

@@ -341,7 +341,7 @@ FORCE:
 %.hdr: FORCE
 	$(OUT_LOG) echo Creating ./common/hydrafw_version.hdr
 	$(OUT_CMD) rm -f $(OBJDIR)/common.o
-	$(OUT_CMD) $(PYTHON) build-scripts/hydrafw-version.py ./common/hydrafw_version.hdr
+	$(OUT_CMD) build-scripts/hydrafw-version ./common/hydrafw_version.hdr
 
 %.dfu: %.hex $(LDSCRIPT)
 	$(OUT_LOG) echo Creating $@

src/build-scripts/hydrafw-version

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+
+if [ $# -eq 1 ]
+then
+  exec > $1  # directing stdout to the file passed as argument
+  vermagic=$(git describe --tags --always --dirty --long)
+  if [[ -n "$GITHUB_CI_PR_SHA" ]]; then
+    # if GITHUB_CI_PR_SHA is set, then it's GitHub Actions build, so workaround to set a valid tag is required
+    sha_id=${GITHUB_CI_PR_SHA:0:7}
+    vermagic=$(echo ${vermagic} | sed "s/-g.*$/-g${sha_id}/")
+  fi
+  echo "#define HYDRAFW_GIT_TAG \"$vermagic\""
+  echo "#define HYDRAFW_CHECKIN_DATE \"$(git show -s --pretty=format:%ai | cut -d' ' -f1)\""
+else
+  echo "usage: $0 outfile.txt"
+  exit 1
+fi