do not fail if repo already exists

build_single.sh will fail on Windows (WSL2) due to `git clone` if we already did a `git submodule update --init --recursive`

1 files changed, 19 insertions, 3 deletions

diff --git a/external/ios/build_zmq.sh b/external/ios/build_zmq.sh
index 0f71bdf..bb583d1 100755
--- a/external/ios/build_zmq.sh
+++ b/external/ios/build_zmq.sh
@@ -10,9 +10,25 @@ ZMQ_URL="https://github.com/zeromq/libzmq.git"
 echo "============================ ZMQ ============================"
 
 echo "Cloning ZMQ from - $ZMQ_URL"
-git clone $ZMQ_URL $ZMQ_PATH
-cd $ZMQ_PATH
-mkdir cmake-build
+
+# Check if the directory already exists.
+if [ -d "$ZMQ_PATH" ]; then
+    echo "ZeroMQ directory already exists."
+else
+    echo "Cloning ZeroMQ from $ZeroMQ_URL"
+	git clone $ZMQ_URL $ZMQ_PATH
+fi
+
+# Verify if the repository was cloned successfully.
+if [ -d "$ZMQ_PATH/.git" ]; then
+    echo "ZeroMQ repository cloned successfully."
+	cd $ZMQ_PATH
+else
+    echo "Failed to clone ZeroMQ repository. Exiting."
+    exit 1
+fi
+
+mkdir -p cmake-build
 cd cmake-build
 cmake ..
 make