[PATCH v6] Improve handoff prepare on SoCFPGA

[Brian Sune]

Ensure qts folder header files are properly updated by isolating
the Python execution environment. This prevents partial or failed
script runs from corrupting the target directory.

Changelog v5 -> v6:
 - Clean HANDOFF_KEEP comments.

Changelog v4 -> v5:
 - Change HANDOFF_KEEP condition to if [ "$${HANDOFF_KEEP:-0}" != "0" ]
 - Add HANDOFF_KEEP and HANDOFF_PATH comments in config.mk

Changes:
 - Implement a temp folder for Python script execution.
 - Clean temp folder automatically despite execution failures.
 - Gate the file replacement process on the successful exit of
   the Python scripts.
 - Execute the replacement (with or without keep) only upon script
   success via the NEW HANDOFF_KEEP=xxx variable.
 - Rename old files to .h.handoff_backup.<timestamp> when the
   keep option is selected.
Signed-off-by: Brian Sune <briansune at gmail.com>
---
 arch/arm/mach-socfpga/config.mk | 39 ++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-socfpga/config.mk b/arch/arm/mach-socfpga/config.mk
index 1ca1d33cb16..f341aaaea56 100644
--- a/arch/arm/mach-socfpga/config.mk
+++ b/arch/arm/mach-socfpga/config.mk
@@ -1,6 +1,18 @@
 # SPDX-License-Identifier: GPL-2.0+
 #
 # Brian Sune <briansune at gmail.com>
+#
+# HANDOFF_PATH
+# ------------
+# Unset - Board path where qts locates and "hps_isw_handoff" should be placed.
+# Set   - Custom path points to "hps_isw_handoff" folder.
+#
+# HANDOFF_KEEP
+# ------------
+# Unset	- Clean header files.
+# Set	- HANDOFF_KEEP= , Clean header files.
+#	  HANDOFF_KEEP=0, Clean header files.
+#	  HANDOFF_KEEP=1, Backup header files and rename to ".h.handoff_backup.<timestamp>".
 
 ifeq ($(CONFIG_ARCH_SOCFPGA_CYCLONE5),y)
 archprepare: socfpga_g5_handoff_prepare
@@ -43,6 +55,27 @@ socfpga_g5_handoff_prepare:
 			exit 0; \
 		fi; \
 		echo "[INFO] Found hiof file: $$HIOF_FILE"; \
-		echo "[INFO] Running BSP generator..."; \
-		python3 $(srctree)/tools/cv_bsp_generator/cv_bsp_generator.py -i "$$HANDOFF_PATH" -o "$$BOARD_DIR/qts" || echo "[WARN] BSP generator failed, continuing..."; \
-		echo "[DONE] SoCFPGA QTS handoff conversion complete."
+		echo "[INFO] Try BSP generator..."; \
+		TEMP_DIR=$$(mktemp -dp "$$BOARD_DIR/"); \
+		trap 'rm -rf "$$TEMP_DIR"' EXIT; \
+		if python3 $(srctree)/tools/cv_bsp_generator/cv_bsp_generator.py -i "$$HANDOFF_PATH" -o "$$TEMP_DIR"; then \
+			if [ "$${HANDOFF_KEEP:-0}" != "0" ]; then \
+				echo "[INFO] Preserving old BSP files..."; \
+				TIMESTAMP=$$(date +%Y%m%d_%H%M%S); \
+				for f in "$$BOARD_DIR"/qts/*.h; do \
+					[ -e "$$f" ] || continue; \
+					echo "[INFO] $$f -> $${f%.h}.h.handoff_backup.$$TIMESTAMP"; \
+					mv "$$f" "$${f%.h}.h.handoff_backup.$$TIMESTAMP"; \
+				done; \
+			else \
+				echo "[INFO] Clean old BSP files..."; \
+				if ls "$$BOARD_DIR/qts"/*.h >/dev/null 2>&1; then \
+					rm "$$BOARD_DIR/qts"/*.h; \
+					echo "[INFO] Removed old BSP files..."; \
+				fi; \
+			fi; \
+			mv "$$TEMP_DIR"/*.h "$$BOARD_DIR"/qts; \
+			echo "[INFO] SoCFPGA QTS handoff conversion complete."; \
+		else \
+			echo "[WARN] BSP generator failed!"; \
+		fi;
-- 
2.34.1