chore(backward): use shallow clone for backward compat tests

Makefile

@@ -20,6 +20,7 @@ BENCH_OP_FLAVOR?=DEFAULT
 NODE_VERSION=20
 FORWARD_COMPAT?=OFF
 BACKWARD_COMPAT_DATA_URL=https://github.com/zama-ai/tfhe-backward-compat-data.git
+BACKWARD_COMPAT_DATA_BRANCH=v0.1
 BACKWARD_COMPAT_DATA_DIR=tfhe-backward-compat-data
 # sed: -n, do not print input stream, -e means a script/expression
 # 1,/version/ indicates from the first line, to the line matching version at the start of the line
@@ -1016,7 +1017,7 @@ write_params_to_file: install_rs_check_toolchain
 
 .PHONY: clone_backward_compat_data # Clone the data repo needed for backward compatibility tests
 clone_backward_compat_data:
-	./scripts/clone_backward_compat_data.sh $(BACKWARD_COMPAT_DATA_URL) tfhe/$(BACKWARD_COMPAT_DATA_DIR)
+	./scripts/clone_backward_compat_data.sh $(BACKWARD_COMPAT_DATA_URL) $(BACKWARD_COMPAT_DATA_BRANCH) tfhe/$(BACKWARD_COMPAT_DATA_DIR)
 
 tfhe/$(BACKWARD_COMPAT_DATA_DIR): clone_backward_compat_data
 

scripts/clone_backward_compat_data.sh

@@ -2,8 +2,8 @@
 
 set -e
 
-if [ $# -lt 2 ]; then
-		echo "$0 git_url dest_path"
+if [ $# -lt 3 ]; then
+		echo "$0 git_url branch dest_path"
 		exit 1
 fi
 
@@ -13,7 +13,8 @@ if ! git lfs env 2>/dev/null >/dev/null; then
 fi
 
 if [ -d $2 ]; then
-		cd $2 && git pull
+		cd $2 && git fetch --depth 1 && git reset --hard origin/$2 && git clean -dfx
+
 else
-		git clone $1 $2
+		git clone $1 -b $2 --depth 1
 fi