Added ifwait script to make the container wait for all CLAB interfaces to appear

Dockerfile

@@ -82,6 +82,7 @@ COPY gotty-service /usr/local/bin/gotty-service
 RUN chmod +x /usr/local/bin/gotty-service
 
 COPY entrypoint.sh /docker/entrypoint.sh
+COPY if-wait.sh /docker/if-wait.sh
 
 # Start nginx in foreground (pass CMD to docker entrypoint.sh):
 CMD ["/usr/sbin/nginx", "-g", "daemon off;"]

entrypoint.sh

@@ -1,3 +1,7 @@
+#!/bin/sh
+
+sh /docker/if-wait.sh
+
 ifup -a
 #########
 # create directories for ssh host keys

if-wait.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+
+# Validate CLAB_INTFS environment variable
+REQUIRED_INTFS_NUM=${CLAB_INTFS:-0}
+if ! echo "$REQUIRED_INTFS_NUM" | grep -qE '^[0-9]+$' || [ "$REQUIRED_INTFS_NUM" -eq 0 ]; then
+    echo "Warning: CLAB_INTFS not set or invalid, skipping interface wait"
+    REQUIRED_INTFS_NUM=0
+fi
+
+SLEEP=0
+TIMEOUT=300  # 5 minute timeout
+WAIT_TIME=0
+
+int_calc() {
+    if [ ! -d "/sys/class/net/" ]; then
+        echo "Error: /sys/class/net/ not accessible"
+        AVAIL_INTFS_NUM=0
+        return 1
+    fi
+
+    # More comprehensive interface pattern including common container interfaces
+    AVAIL_INTFS_NUM=$(ls -1 /sys/class/net/ 2>/dev/null | grep -cE '^(eth[1-9]|et[0-9]|ens|eno|enp|e[1-9]|net[0-9])')
+    return 0
+}
+
+# Only wait for interfaces if CLAB_INTFS is set
+if [ "$REQUIRED_INTFS_NUM" -gt 0 ]; then
+    echo "Waiting for $REQUIRED_INTFS_NUM interfaces to be connected (timeout: ${TIMEOUT}s)"
+
+    while [ "$WAIT_TIME" -lt "$TIMEOUT" ]; do
+        if ! int_calc; then
+            echo "Failed to check interfaces, continuing..."
+            break
+        fi
+
+        if [ "$AVAIL_INTFS_NUM" -ge "$REQUIRED_INTFS_NUM" ]; then
+            echo "Found $AVAIL_INTFS_NUM interfaces (required: $REQUIRED_INTFS_NUM)"
+            break
+        fi
+
+        echo "Connected $AVAIL_INTFS_NUM interfaces out of $REQUIRED_INTFS_NUM (waited ${WAIT_TIME}s)"
+        sleep 1
+        WAIT_TIME=$((WAIT_TIME + 1))
+    done
+
+    if [ "$WAIT_TIME" -ge "$TIMEOUT" ]; then
+        echo "Warning: Timeout reached, proceeding with $AVAIL_INTFS_NUM interfaces"
+    fi
+fi
+
+if [ "$SLEEP" -ne 0 ]; then
+    echo "Sleeping $SLEEP seconds before boot"
+    sleep $SLEEP
+fi