Autodiscovery refactoring with mesh support

autodiscover.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
+
 # Load .env file if exists (for shared configuration)
 # This is called early so that DOTENV_* variables are available to all functions
 load_env_if_exists() {
@@ -8,8 +10,7 @@ load_env_if_exists() {
 
     # If CONFIG_FILE is not set, check default location
     if [[ -z "$env_file" ]]; then
-        local script_dir="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
+        env_file="$SCRIPT_DIR/.env"
-        env_file="$script_dir/.env"
         config_explicit="false"
     fi
 
@@ -47,6 +48,9 @@ load_env_if_exists() {
 # Load .env file
 load_env_if_exists
 
+# Mesh mode flag (set by detect_interfaces)
+MESH_MODE="false"
+
 # Function to detect IB and Ethernet interfaces
 detect_interfaces() {
     # If both interfaces are already set, nothing to do
@@ -72,49 +76,115 @@ detect_interfaces() {
     fi
 
     DETECTED_IB_IFS=()
-    CANDIDATE_ETH_IFS=()
+    ALL_NET_IFS=()
 
     for pair in "${IB_NET_PAIRS[@]}"; do
         ib_dev=$(echo "$pair" | awk '{print $1}')
         net_dev=$(echo "$pair" | awk '{print $2}')
-        
         DETECTED_IB_IFS+=("$ib_dev")
+        ALL_NET_IFS+=("$net_dev")
+    done
 
-        # Check if interface has an IP address
+    local num_up="${#IB_NET_PAIRS[@]}"
-        if ip addr show "$net_dev" | grep -q "inet "; then
+
-            CANDIDATE_ETH_IFS+=("$net_dev")
+    # --- Sanity checks ---
+
+    # 1. enp* (no capital P) interfaces MUST have an IP
+    for net_dev in "${ALL_NET_IFS[@]}"; do
+        if [[ "$net_dev" =~ ^enp[^P] ]] || [[ "$net_dev" == enp* && "$net_dev" != *P* ]]; then
+            if ! ip addr show "$net_dev" 2>/dev/null | grep -q "inet "; then
+                echo "Error: Interface $net_dev (enp*, no capital P) is Up but has no IP address assigned."
+                return 1
+            fi
         fi
     done
 
-    # Set IB_IF if not provided
+    # 2. No two interfaces with IPs should share the same subnet
-    if [[ -z "$IB_IF" ]]; then
+    declare -A SEEN_SUBNETS
-        IB_IF=$(IFS=,; echo "${DETECTED_IB_IFS[*]}")
+    for net_dev in "${ALL_NET_IFS[@]}"; do
-        echo "  Detected IB_IF: $IB_IF"
+        local cidr
-    fi
+        cidr=$(ip -o -f inet addr show "$net_dev" 2>/dev/null | awk '{print $4}' | head -n1)
-
+        [[ -z "$cidr" ]] && continue
-    # Set ETH_IF if not provided
+        # Compute network address using python3
-    if [[ -z "$ETH_IF" ]]; then
+        local net_addr
-        if [ ${#CANDIDATE_ETH_IFS[@]} -eq 0 ]; then
+        net_addr=$(python3 -c "import ipaddress; print(str(ipaddress.ip_network('$cidr', strict=False)))" 2>/dev/null)
-            echo "Error: No active IB-associated interfaces have IP addresses."
+        if [[ -n "${SEEN_SUBNETS[$net_addr]}" ]]; then
+            echo "Error: Interfaces $net_dev and ${SEEN_SUBNETS[$net_addr]} share the same subnet ($net_addr). Check network configuration."
             return 1
         fi
+        SEEN_SUBNETS["$net_addr"]="$net_dev"
+    done
 
-        # Selection logic: Prefer interface without capital 'P'
+    # --- Mode selection ---
-        SELECTED_ETH=""
-        for iface in "${CANDIDATE_ETH_IFS[@]}"; do
-            if [[ "$iface" != *"P"* ]]; then
-                SELECTED_ETH="$iface"
-                break
-            fi
-        done
 
-        # Fallback: Use the first one if all have 'P' or none found yet
+    if [[ "$num_up" -eq 2 ]]; then
-        if [[ -z "$SELECTED_ETH" ]]; then
+        # Non-mesh configuration
-            SELECTED_ETH="${CANDIDATE_ETH_IFS[0]}"
+        MESH_MODE="false"
+        echo "  Non-mesh mode: 2 CX7 interfaces active."
+
+        # Set IB_IF if not provided
+        if [[ -z "$IB_IF" ]]; then
+            IB_IF=$(IFS=,; echo "${DETECTED_IB_IFS[*]}")
+            echo "  Detected IB_IF: $IB_IF"
         fi
 
-        ETH_IF="$SELECTED_ETH"
+        # Set ETH_IF if not provided: prefer interface without capital 'P'
-        echo "  Detected ETH_IF: $ETH_IF"
+        if [[ -z "$ETH_IF" ]]; then
+            local selected_eth=""
+            for net_dev in "${ALL_NET_IFS[@]}"; do
+                if ip addr show "$net_dev" 2>/dev/null | grep -q "inet "; then
+                    if [[ "$net_dev" != *P* ]]; then
+                        selected_eth="$net_dev"
+                        break
+                    fi
+                fi
+            done
+            # Fallback: first interface with an IP
+            if [[ -z "$selected_eth" ]]; then
+                for net_dev in "${ALL_NET_IFS[@]}"; do
+                    if ip addr show "$net_dev" 2>/dev/null | grep -q "inet "; then
+                        selected_eth="$net_dev"
+                        break
+                    fi
+                done
+            fi
+            if [[ -z "$selected_eth" ]]; then
+                echo "Error: No active IB-associated interfaces have IP addresses."
+                return 1
+            fi
+            ETH_IF="$selected_eth"
+            echo "  Detected ETH_IF: $ETH_IF"
+        fi
+
+    elif [[ "$num_up" -eq 4 ]]; then
+        # Mesh configuration
+        MESH_MODE="true"
+        echo "  Mesh mode: all 4 CX7 interfaces active."
+
+        # Set IB_IF to all four RoCE interfaces (hardcoded for mesh)
+        if [[ -z "$IB_IF" ]]; then
+            IB_IF="rocep1s0f0,roceP2p1s0f0,rocep1s0f1,roceP2p1s0f1"
+            echo "  Detected IB_IF: $IB_IF"
+        fi
+
+        # Set ETH_IF: check enP7s7 first, then wlP9s9
+        if [[ -z "$ETH_IF" ]]; then
+            if ip addr show enP7s7 2>/dev/null | grep -q "inet "; then
+                ETH_IF="enP7s7"
+                echo "  Detected ETH_IF: $ETH_IF"
+            elif ip addr show wlP9s9 2>/dev/null | grep -q "inet "; then
+                ETH_IF="wlP9s9"
+                echo "  Detected ETH_IF: $ETH_IF"
+                echo "  Warning: using wireless interface (wlP9s9) for cluster coordination. Performance may be limited."
+            else
+                echo "Error: Mesh mode requires enP7s7 or wlP9s9 to be up with an IP address for cluster coordination."
+                return 1
+            fi
+        fi
+
+    else
+        echo "Error: Unexpected number of active CX7 interfaces ($num_up). Expected 2 (non-mesh) or 4 (mesh)."
+        return 1
     fi
 }
 
@@ -141,6 +211,41 @@ detect_local_ip() {
     echo "  Detected Local IP: $LOCAL_IP ($CIDR)"
 }
 
+# Scan a subnet for GB10-capable peers via SSH
+# Usage: _scan_subnet_for_gb10 <cidr> <local_ip_to_exclude> <output_file>
+_scan_subnet_for_gb10() {
+    local cidr="$1"
+    local exclude_ip="$2"
+    local out_file="$3"
+
+    if ! command -v python3 &> /dev/null; then
+        echo "Error: python3 not found."
+        return 1
+    fi
+    if ! command -v nc &> /dev/null; then
+        echo "Error: nc (netcat) not found."
+        return 1
+    fi
+
+    local all_ips
+    all_ips=$(python3 -c "import ipaddress, sys; [print(ip) for ip in ipaddress.ip_network(sys.argv[1], strict=False).hosts()]" "$cidr")
+
+    for ip in $all_ips; do
+        [[ "$ip" == "$exclude_ip" ]] && continue
+        (
+            if nc -z -w 1 "$ip" 22 &>/dev/null; then
+                # Check if remote is a GB10 system
+                if ssh -o ConnectTimeout=3 -o StrictHostKeyChecking=no -o BatchMode=yes "$ip" \
+                    "nvidia-smi --query-gpu=name --format=csv,noheader 2>/dev/null" \
+                    2>/dev/null | grep -q "NVIDIA GB10"; then
+                    echo "$ip" >> "$out_file"
+                fi
+            fi
+        ) &
+    done
+    wait
+}
+
 # Function to detect cluster nodes
 detect_nodes() {
     detect_local_ip || return 1
@@ -158,71 +263,164 @@ detect_nodes() {
         return 0
     fi
 
-    # Try to use COPY_HOSTS from .env
+    # Try to use CLUSTER_NODES from .env
-    if [[ -n "$DOTENV_COPY_HOSTS" ]]; then
+    if [[ -n "$DOTENV_CLUSTER_NODES" ]]; then
-        echo "  Using COPY_HOSTS from .env: $DOTENV_COPY_HOSTS"
+        echo "  Using CLUSTER_NODES from .env: $DOTENV_CLUSTER_NODES"
         PEER_NODES=()
-        IFS=',' read -ra ALL_NODES <<< "$DOTENV_COPY_HOSTS"
+        IFS=',' read -ra ALL_NODES <<< "$DOTENV_CLUSTER_NODES"
         for node in "${ALL_NODES[@]}"; do
             node=$(echo "$node" | xargs)
-            PEER_NODES+=("$node")
+            [[ "$node" != "$LOCAL_IP" ]] && PEER_NODES+=("$node")
         done
-        NODES_ARG="$DOTENV_COPY_HOSTS"
+        NODES_ARG="$DOTENV_CLUSTER_NODES"
         return 0
     fi
 
-    echo "Auto-detecting nodes..."
+    echo "Auto-detecting nodes on $CIDR (checking for NVIDIA GB10)..."
 
-    if ! command -v nc &> /dev/null; then
+    local temp_file
-        echo "Error: nc (netcat) not found. Please install netcat."
+    temp_file=$(mktemp)
-        return 1
-    fi
 
-    if ! command -v python3 &> /dev/null; then
+    _scan_subnet_for_gb10 "$CIDR" "$LOCAL_IP" "$temp_file"
-        echo "Error: python3 not found. Please install python3."
-        return 1
-    fi
 
-    DETECTED_IPS=("$LOCAL_IP")
     PEER_NODES=()
-    
+    local detected_ips=("$LOCAL_IP")
-    echo "  Scanning for SSH peers on $CIDR..."
+    if [[ -f "$temp_file" ]]; then
-    
-    # Generate list of IPs using python
-    ALL_IPS=$(python3 -c "import ipaddress, sys; [print(ip) for ip in ipaddress.ip_network(sys.argv[1], strict=False).hosts()]" "$CIDR")
-    
-    TEMP_IPS_FILE=$(mktemp)
-    
-    # Scan in parallel
-    for ip in $ALL_IPS; do
-        # Skip own IP
-        if [[ "$ip" == "$LOCAL_IP" ]]; then continue; fi
-        
-        (
-            # Check port 22 with 1 second timeout
-            if nc -z -w 1 "$ip" 22 &>/dev/null; then
-                echo "$ip" >> "$TEMP_IPS_FILE"
-            fi
-        ) &
-    done
-    
-    # Wait for all background scans to complete
-    wait
-    
-    # Read found IPs
-    if [[ -f "$TEMP_IPS_FILE" ]]; then
         while read -r ip; do
-             DETECTED_IPS+=("$ip")
+            PEER_NODES+=("$ip")
-             PEER_NODES+=("$ip")
+            detected_ips+=("$ip")
-             echo "  Found peer: $ip"
+            echo "  Found GB10 peer: $ip"
-        done < "$TEMP_IPS_FILE"
+        done < <(sort "$temp_file")
-        rm -f "$TEMP_IPS_FILE"
+        rm -f "$temp_file"
     fi
 
-    # Sort IPs
+    # Sort and set NODES_ARG
-    IFS=$'\n' SORTED_IPS=($(sort <<<"${DETECTED_IPS[*]}"))
+    IFS=$'\n' SORTED_IPS=($(sort <<<"${detected_ips[*]}"))
     unset IFS
-    
     NODES_ARG=$(IFS=,; echo "${SORTED_IPS[*]}")
     echo "  Cluster Nodes: $NODES_ARG"
 }
+
+# Function to detect COPY_HOSTS for build/model distribution
+# In non-mesh mode: COPY_PEER_NODES = PEER_NODES (same network)
+# In mesh mode: scan enp* interfaces (direct IB-attached) for GB10 peers
+detect_copy_hosts() {
+    if [[ "$MESH_MODE" == "false" ]]; then
+        COPY_PEER_NODES=("${PEER_NODES[@]}")
+        return 0
+    fi
+
+    # Mesh mode: scan enp1s0f0np0 and enp1s0f1np1 subnets
+    echo "Auto-detecting COPY_HOSTS on direct IB interfaces (mesh mode)..."
+
+    local temp_file
+    temp_file=$(mktemp)
+
+    for iface in enp1s0f0np0 enp1s0f1np1; do
+        local cidr
+        cidr=$(ip -o -f inet addr show "$iface" 2>/dev/null | awk '{print $4}' | head -n1)
+        [[ -z "$cidr" ]] && continue
+        local local_iface_ip="${cidr%/*}"
+        echo "  Scanning $iface ($cidr)..."
+        _scan_subnet_for_gb10 "$cidr" "$local_iface_ip" "$temp_file"
+    done
+
+    # Deduplicate and collect results
+    COPY_PEER_NODES=()
+    declare -A _SEEN_COPY
+    if [[ -f "$temp_file" ]]; then
+        while read -r ip; do
+            if [[ -z "${_SEEN_COPY[$ip]}" ]]; then
+                _SEEN_COPY["$ip"]=1
+                COPY_PEER_NODES+=("$ip")
+                echo "  Found GB10 copy host: $ip"
+            fi
+        done < <(sort "$temp_file")
+        rm -f "$temp_file"
+    fi
+}
+
+# Save discovered configuration to .env
+# Skips if .env already exists unless FORCE_DISCOVER=true
+save_config() {
+    local env_file="${CONFIG_FILE:-$SCRIPT_DIR/.env}"
+
+    # Skip if .env exists and not forced
+    if [[ -f "$env_file" && "${FORCE_DISCOVER:-false}" != "true" ]]; then
+        return 0
+    fi
+
+    echo ""
+    local save_prompt="Save discovered configuration to $env_file?"
+    if [[ -f "$env_file" ]]; then
+        save_prompt="Overwrite existing configuration in $env_file?"
+    fi
+    read -r -p "$save_prompt [Y/n]: " response
+    response="${response,,}"
+    if [[ "$response" =~ ^(n|no)$ ]]; then
+        return 0
+    fi
+
+    # Build list of all cluster nodes (local + peers)
+    local all_cluster_nodes=()
+    if [[ -n "$LOCAL_IP" ]]; then
+        all_cluster_nodes+=("$LOCAL_IP")
+    fi
+    for node in "${PEER_NODES[@]}"; do
+        all_cluster_nodes+=("$node")
+    done
+
+    # Per-node confirmation for CLUSTER_NODES
+    echo ""
+    echo "Select nodes for CLUSTER_NODES:"
+    local selected_cluster=()
+    for node in "${all_cluster_nodes[@]}"; do
+        local label="$node"
+        [[ "$node" == "$LOCAL_IP" ]] && label="$node (this machine)"
+        read -r -p "  Include $label? [Y/n]: " r
+        r="${r,,}"
+        if [[ ! "$r" =~ ^(n|no)$ ]]; then
+            selected_cluster+=("$node")
+        fi
+    done
+
+    if [[ "${#selected_cluster[@]}" -eq 0 ]]; then
+        echo "No nodes selected. Aborting save."
+        return 1
+    fi
+
+    # Per-node confirmation for COPY_HOSTS
+    echo ""
+    echo "Select nodes for COPY_HOSTS (build/model distribution):"
+    local selected_copy=()
+    for node in "${COPY_PEER_NODES[@]}"; do
+        read -r -p "  Include $node in COPY_HOSTS? [Y/n]: " r
+        r="${r,,}"
+        if [[ ! "$r" =~ ^(n|no)$ ]]; then
+            selected_copy+=("$node")
+        fi
+    done
+
+    # Write .env
+    {
+        echo "# Auto-generated by autodiscover.sh"
+        echo "CLUSTER_NODES=$(IFS=,; echo "${selected_cluster[*]}")"
+        if [[ "${#selected_copy[@]}" -gt 0 ]]; then
+            echo "COPY_HOSTS=$(IFS=,; echo "${selected_copy[*]}")"
+        fi
+        echo "LOCAL_IP=$LOCAL_IP"
+        echo "ETH_IF=$ETH_IF"
+        echo "IB_IF=$IB_IF"
+    } > "$env_file"
+    echo ""
+    echo "Saved to $env_file"
+}
+
+# Convenience function: run full autodiscovery pipeline
+run_autodiscover() {
+    detect_interfaces || return 1
+    detect_local_ip || return 1
+    detect_nodes || return 1
+    detect_copy_hosts || return 1
+    save_config
+}

build-and-copy.sh

@@ -282,6 +282,7 @@ usage() {
     echo "  --network <network>           : Docker network to use during build"
     echo "  --cleanup                     : Remove all *.whl and *.-commit files in wheels directory"
     echo "  --config                      : Path to .env configuration file (default: .env in script directory)"
+    echo "  --setup                       : Force autodiscovery and save configuration (even if .env exists)"
     echo "  -h, --help                    : Show this help message"
     exit 1
 }
@@ -334,6 +335,7 @@ while [[ "$#" -gt 0 ]]; do
             fi
             ;;
         --config) CONFIG_FILE="$2"; CONFIG_FILE_SET=true; shift ;;
+        --setup) FORCE_DISCOVER=true; export FORCE_DISCOVER ;;
         -h|--help) usage ;;
         *) echo "Unknown parameter passed: $1"; usage ;;
     esac
@@ -343,6 +345,18 @@ done
 # Source autodiscover.sh to load .env file
 source "$(dirname "$0")/autodiscover.sh"
 
+# If --setup: force full autodiscovery and save configuration
+if [[ "${FORCE_DISCOVER:-false}" == "true" ]]; then
+    echo "Running full autodiscovery (--setup)..."
+    detect_interfaces || exit 1
+    detect_local_ip || exit 1
+    detect_nodes || exit 1
+    detect_copy_hosts || exit 1
+    save_config || exit 1
+    # Reload .env so DOTENV_* variables reflect saved config
+    load_env_if_exists
+fi
+
 # Handle COPY_HOSTS from .env or autodiscovery if not specified via arguments
 if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
     if [[ -n "$DOTENV_COPY_HOSTS" ]]; then
@@ -351,19 +365,18 @@ if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
         COPY_HOSTS=("${HOSTS_FROM_ENV[@]}")
     else
         echo "No hosts specified. Using autodiscovery..."
-        detect_nodes
+        detect_interfaces || { echo "Error: Interface detection failed."; exit 1; }
-        if [ $? -ne 0 ]; then
+        detect_local_ip || { echo "Error: Local IP detection failed."; exit 1; }
-            echo "Error: Autodiscovery failed."
+        detect_nodes || { echo "Error: Node detection failed."; exit 1; }
-            exit 1
+        detect_copy_hosts || { echo "Error: Copy host detection failed."; exit 1; }
-        fi
 
-        if [ ${#PEER_NODES[@]} -gt 0 ]; then
+        if [ "${#COPY_PEER_NODES[@]}" -gt 0 ]; then
-            COPY_HOSTS=("${PEER_NODES[@]}")
+            COPY_HOSTS=("${COPY_PEER_NODES[@]}")
         fi
 
         if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
-              echo "Error: Autodiscovery found no other nodes."
+            echo "Error: Autodiscovery found no other nodes."
-              exit 1
+            exit 1
         fi
         echo "Autodiscovered hosts: ${COPY_HOSTS[*]}"
     fi

hf-download.sh

@@ -7,6 +7,8 @@ HUB_PATH="${HF_HOME:-$HOME/.cache/huggingface}/hub"
 COPY_HOSTS=()
 SSH_USER="$USER"
 PARALLEL_COPY=false
+CONFIG_FILE=""
+CONFIG_FILE_SET=false
 
 # Help function
 usage() {
@@ -16,6 +18,7 @@ usage() {
     echo "      --copy-to-host          : Alias for --copy-to (backwards compatibility)."
     echo "      --copy-parallel         : Copy to all hosts in parallel instead of serially."
     echo "  -u, --user <user>           : Username for ssh commands (default: \$USER)"
+    echo "  --config <file>             : Path to .env configuration file (default: .env in script directory)"
     echo "  -h, --help                  : Show this help message"
     exit 1
 }
@@ -53,42 +56,22 @@ copy_model_to_host() {
 }
 
 # Argument parsing
+COPY_TO_FLAG=false
 while [[ "$#" -gt 0 ]]; do
     case $1 in
         -c|--copy-to|--copy-to-host|--copy-to-hosts)
+            COPY_TO_FLAG=true
             shift
             # Consume arguments until the next flag or end of args
             while [[ "$#" -gt 0 && "$1" != -* ]]; do
                 add_copy_hosts "$1"
                 shift
             done
-
-            # If no hosts specified, use autodiscovery
-            if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
-                echo "No hosts specified. Using autodiscovery..."
-                source "$(dirname "$0")/autodiscover.sh"
-                
-                detect_nodes
-                if [ $? -ne 0 ]; then
-                    echo "Error: Autodiscovery failed."
-                    exit 1
-                fi
-                
-                # Use PEER_NODES directly
-                if [ ${#PEER_NODES[@]} -gt 0 ]; then
-                    COPY_HOSTS=("${PEER_NODES[@]}")
-                fi
-                
-                if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
-                     echo "Error: Autodiscovery found no other nodes."
-                     exit 1
-                fi
-                echo "Autodiscovered hosts: ${COPY_HOSTS[*]}"
-            fi
             continue
             ;;
         --copy-parallel) PARALLEL_COPY=true ;;
         -u|--user) SSH_USER="$2"; shift ;;
+        --config) CONFIG_FILE="$2"; CONFIG_FILE_SET=true; shift ;;
         -h|--help) usage ;;
         *)
             # If positional argument is provided
@@ -103,12 +86,47 @@ while [[ "$#" -gt 0 ]]; do
     shift
 done
 
+# Export config so autodiscover.sh picks it up
+export CONFIG_FILE CONFIG_FILE_SET
+
+# Source autodiscover.sh to load .env (for DOTENV_COPY_HOSTS) and make detection functions available
+source "$(dirname "$0")/autodiscover.sh"
+
 # Validate model name is provided
 if [ -z "${MODEL_NAME:-}" ]; then
     echo "Error: Model name is required."
     usage
 fi
 
+# Resolve COPY_HOSTS if --copy-to was given without hosts, or use .env
+if [ "$COPY_TO_FLAG" = true ] && [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
+    # --copy-to was specified but no hosts given: use .env or autodiscover
+    if [[ -n "$DOTENV_COPY_HOSTS" ]]; then
+        echo "Using COPY_HOSTS from .env: $DOTENV_COPY_HOSTS"
+        IFS=',' read -ra HOSTS_FROM_ENV <<< "$DOTENV_COPY_HOSTS"
+        COPY_HOSTS=("${HOSTS_FROM_ENV[@]}")
+    else
+        echo "No hosts specified. Using autodiscovery..."
+        detect_interfaces || { echo "Error: Interface detection failed."; exit 1; }
+        detect_local_ip || { echo "Error: Local IP detection failed."; exit 1; }
+        detect_nodes || { echo "Error: Node detection failed."; exit 1; }
+        detect_copy_hosts || { echo "Error: Copy host detection failed."; exit 1; }
+
+        if [ "${#COPY_PEER_NODES[@]}" -gt 0 ]; then
+            COPY_HOSTS=("${COPY_PEER_NODES[@]}")
+        fi
+
+        if [ "${#COPY_HOSTS[@]}" -eq 0 ]; then
+            echo "Error: Autodiscovery found no other nodes."
+            exit 1
+        fi
+        echo "Autodiscovered copy hosts: ${COPY_HOSTS[*]}"
+    fi
+elif [ "$COPY_TO_FLAG" = false ] && [ "${#COPY_HOSTS[@]}" -eq 0 ] && [[ -n "$DOTENV_COPY_HOSTS" ]]; then
+    # No --copy-to flag but .env has COPY_HOSTS — don't auto-copy; user must request it explicitly
+    : # intentional no-op; user didn't ask for copy
+fi
+
 # Check if uvx is installed
 if ! command -v uvx &> /dev/null; then
     echo "Error: 'uvx' command not found."

launch-cluster.sh

@@ -68,7 +68,8 @@ usage() {
     echo "  --mem-swap-limit-gb Memory+swap limit in GB (default: mem-limit + 10, only with --non-privileged)"
     echo "  --pids-limit    Process limit (default: 4096, only with --non-privileged)"
     echo "  --shm-size-gb   Shared memory size in GB (default: 64, only with --non-privileged)"
-    echo "  --config        Path to .env configuration file (default: .env in script directory)"
+    echo "  --config        Path to .env configuration file (default: .env in script directory)
+  --setup         Force autodiscovery and save configuration (even if .env exists)"
     echo "  action          start | stop | status | exec (Default: start). Not compatible with --launch-script."
     echo "  command         Command to run (only for 'exec' action). Not compatible with --launch-script."
     echo ""
@@ -131,6 +132,7 @@ while [[ "$#" -gt 0 ]]; do
         -d) DAEMON_MODE="true" ;;
         -h|--help) usage ;;
         --config) CONFIG_FILE="$2"; shift ;;
+        --setup) FORCE_DISCOVER=true; export FORCE_DISCOVER ;;
         start|stop|status) 
             if [[ -n "$LAUNCH_SCRIPT_PATH" ]]; then
                 echo "Error: Action '$1' is not compatible with --launch-script. Please omit the action or not use --launch-script."
@@ -411,6 +413,21 @@ done
 # Source autodiscover module
 source "$(dirname "$0")/autodiscover.sh"
 
+if [[ "${FORCE_DISCOVER:-false}" == "true" ]]; then
+    # --setup: force full autodiscovery and save configuration
+    echo "Running full autodiscovery (--setup)..."
+    detect_interfaces || exit 1
+    detect_local_ip || exit 1
+    detect_nodes || exit 1
+    detect_copy_hosts || exit 1
+    save_config || exit 1
+    # Reload .env so DOTENV_* variables reflect saved config
+    load_env_if_exists
+    [[ -z "$NODES_ARG" && -n "$DOTENV_CLUSTER_NODES" ]] && NODES_ARG="$DOTENV_CLUSTER_NODES"
+    [[ -z "$ETH_IF" && -n "$DOTENV_ETH_IF" ]] && ETH_IF="$DOTENV_ETH_IF"
+    [[ -z "$IB_IF" && -n "$DOTENV_IB_IF" ]] && IB_IF="$DOTENV_IB_IF"
+fi
+
 if [[ "$SOLO_MODE" == "true" ]]; then
     # Solo mode: skip node detection, just get local IP
     # Use LOCAL_IP from .env if set, otherwise default to 127.0.0.1

run-recipe.py

@@ -547,7 +547,6 @@ def load_env_file() -> dict[str, str]:
     Reads the .env file created by --discover for persistent cluster configuration.
 
     EXTENSIBILITY:
-    - To add new persistent settings: Just add them to save_env_file()
     - To support multiple .env files: Add a --env-file CLI argument
     - To add validation: Check for required keys after loading
 
@@ -573,57 +572,16 @@ def load_env_file() -> dict[str, str]:
     return env
 
 
-def save_env_file(env: dict[str, str]) -> None:
-    """
-    Save environment variables to .env file.
-
-    Persists cluster configuration discovered by autodiscover.sh.
-    Values are properly quoted if they contain spaces or commas.
-
-    EXTENSIBILITY:
-    - To add new persistent settings: Just add them to the env dict before calling
-    - To add timestamps/metadata: Add comment lines to the output
-    - To support append mode: Read existing, merge, then write
-
-    Args:
-        env: Dictionary of key=value pairs to save
-    """
-    lines = ["# Auto-generated by run-recipe.py --discover", ""]
-    for key, value in sorted(env.items()):
-        # Quote values with spaces
-        if " " in value or "," in value:
-            lines.append(f'{key}="{value}"')
-        else:
-            lines.append(f"{key}={value}")
-    lines.append("")
-
-    with open(ENV_FILE, "w") as f:
-        f.write("\n".join(lines))
-
-    print(f"Saved to {ENV_FILE}")
-
-
 def run_autodiscover() -> dict[str, str] | None:
     """
-    Run autodiscover.sh and return discovered configuration.
+    Run autodiscover.sh interactively and return discovered configuration.
 
     Executes the autodiscover.sh script to detect cluster topology,
-    then presents an interactive node selection menu.
+    including interactive per-node confirmation and .env saving.
-
+    After autodiscover.sh completes, reads configuration from .env file.
-    EXTENSIBILITY:
-    - To add new discovery methods: Extend autodiscover.sh or add Python detection here
-    - To add GPU detection: Add nvidia-smi parsing to discovered env
-    - To skip interactive selection: Add a --non-interactive flag
-    - To add node health checks: Ping/SSH test each discovered node
-
-    DISCOVERED VARIABLES:
-        CLUSTER_NODES: Comma-separated list of node IPs (user-selected)
-        LOCAL_IP: This machine's IP address
-        ETH_IF: Ethernet interface name (e.g., 'eth0')
-        IB_IF: InfiniBand interface name (e.g., 'ibp12s0') if available
 
     Returns:
-        Dictionary with discovered configuration, or None if discovery failed
+        Dictionary with discovered configuration from .env, or None if discovery failed
     """
     if not AUTODISCOVER_SCRIPT.exists():
         print(f"Error: Autodiscover script not found: {AUTODISCOVER_SCRIPT}")
@@ -632,85 +590,28 @@ def run_autodiscover() -> dict[str, str] | None:
     print("Running autodiscover...")
     print()
 
-    # Run autodiscover in a subshell and capture the variables
+    # Build env for the subprocess so CONFIG_FILE is passed through
-    # We source the script and print the variables we care about
+    env_vars = os.environ.copy()
+    env_vars["CONFIG_FILE"] = str(ENV_FILE)
+    env_vars["CONFIG_FILE_SET"] = "true"
+
+    # Run autodiscover interactively so its prompts are shown to the user
     script = f"""
         source '{AUTODISCOVER_SCRIPT}'
-        detect_interfaces
+        run_autodiscover
-        detect_local_ip
-        detect_nodes
-        echo "CLUSTER_NODES=$NODES_ARG"
-        echo "LOCAL_IP=$LOCAL_IP"
-        echo "ETH_IF=$ETH_IF"
-        echo "IB_IF=$IB_IF"
     """
 
-    result = subprocess.run(["bash", "-c", script], capture_output=True, text=True)
+    result = subprocess.run(["bash", "-c", script], env=env_vars)
 
     if result.returncode != 0:
-        print("Autodiscover output:")
-        print(result.stdout)
-        if result.stderr:
-            print(result.stderr)
         print("Error: Autodiscover failed")
         return None
 
-    # Print the autodiscover output (excluding the final variable lines)
+    # Read configuration from the .env file that autodiscover.sh wrote
-    output_lines = result.stdout.strip().split("\n")
+    env = load_env_file()
-    env = {}
+    if not env.get("CLUSTER_NODES"):
-    for line in output_lines:
+        print("Autodiscover completed but no CLUSTER_NODES found in .env")
-        if "=" in line and any(
+        return None
-            line.startswith(k)
-            for k in ["CLUSTER_NODES=", "LOCAL_IP=", "ETH_IF=", "IB_IF="]
-        ):
-            key, _, value = line.partition("=")
-            env[key] = value
-        else:
-            print(line)
-
-    print()
-
-    # Interactive node selection
-    if env.get("CLUSTER_NODES"):
-        all_nodes = [n.strip() for n in env["CLUSTER_NODES"].split(",") if n.strip()]
-        local_ip = env.get("LOCAL_IP", "")
-
-        if len(all_nodes) > 1:
-            print("Select which nodes to include in the cluster:")
-            print()
-
-            selected_nodes = []
-            for node in all_nodes:
-                is_local = node == local_ip
-                label = f"{node} (this machine)" if is_local else node
-
-                # Default to yes for all nodes
-                while True:
-                    response = input(f"  Include {label}? [Y/n]: ").strip().lower()
-                    if response in ("", "y", "yes"):
-                        selected_nodes.append(node)
-                        break
-                    elif response in ("n", "no"):
-                        break
-                    else:
-                        print("    Please enter 'y' or 'n'")
-
-            print()
-
-            if not selected_nodes:
-                print("No nodes selected. Aborting.")
-                return None
-
-            if len(selected_nodes) == 1:
-                print(f"Only one node selected: {selected_nodes[0]}")
-                print("This will run in solo mode (single node).")
-            else:
-                print(
-                    f"Selected {len(selected_nodes)} nodes: {', '.join(selected_nodes)}"
-                )
-
-            env["CLUSTER_NODES"] = ",".join(selected_nodes)
-            print()
 
     return env
 
@@ -990,8 +891,6 @@ Examples:
             print(f"  {key}={value}")
         print()
 
-        save_env_file(env)
-
         if not args.recipe:
             return 0
 
@@ -1058,20 +957,6 @@ Examples:
                     nodes = parse_nodes(discovered_env["CLUSTER_NODES"])
                     nodes_from_env = True
 
-                    if nodes:
-                        # Ask if user wants to save to .env
-                        print()
-                        response = (
-                            input(
-                                "Save this configuration to .env for future use? [Y/n]: "
-                            )
-                            .strip()
-                            .lower()
-                        )
-                        if response in ("", "y", "yes"):
-                            save_env_file(discovered_env)
-                        print()
-
         # Resolve network interfaces: CLI > .env > auto-detect by launch-cluster.sh
         eth_if = args.eth_if or None
         ib_if = args.ib_if or None