Improved the script to add more useful packages and improved the entrypoint script.

.drone.yml

@@ -65,27 +65,3 @@ steps:
         - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-20.04
       cache_to:
         - type=local,dest=/cache/${DRONE_REPO}/ubuntu-20.04,mode=max
-
-  - name: ubuntu-18
-    image: *image
-    depends_on: *depends
-    environment:
-      UBUNTU_VER: 18.04
-    settings:
-      <<: *settings
-      repo: ${DRONE_REPO_LINK:8}/ubuntu-18.04
-      extra_tags:
-        - ${DRONE_REPO_LINK:8}:18.04
-      cache_from:
-        - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-18.04
-      cache_to:
-        - type=local,dest=/cache/${DRONE_REPO}/ubuntu-18.04,mode=max
-
-  # - name: send_n8n
-  #   image: curlimages/curl:latest
-  #   depends_on:
-  #     - ubuntu-22
-  #     - ubuntu-20
-  #     - ubuntu-18
-  #   commands:
-  #     - curl https://n8n.ahkhan.me/webhook/drone/gitea/docker/ubuntu -H 'Authorization:Bearer wJlK5lDvTUS03Cfd4RWKyQ'

Dockerfile

@@ -2,40 +2,60 @@ ARG UBUNTU_VER
 
 FROM ubuntu:${UBUNTU_VER}
 
-ARG TARGETPLATFORM
-
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Enable autocompletion
-RUN rm /etc/apt/apt.conf.d/docker-*
-RUN echo "if [ -f /etc/bash_completion ] && ! shopt -oq posix; then \
-        . /etc/bash_completion; \
-    fi" >> /root/.bashrc
+# Enable autocompletion and install packages in optimized layers
+RUN rm /etc/apt/apt.conf.d/docker-* && \
+    echo 'if [ -f /etc/bash_completion ] && ! shopt -oq posix; then . /etc/bash_completion; fi' >> /root/.bashrc
 
-RUN apt update
+RUN apt update && apt install -y \
+        # Basic utilities
+        curl wget nano lsb-release sudo bash-completion jq git screen cron \
+        # Basic networking tools  
+        net-tools iputils-ping iproute2 iptables dnsutils \
+        # Network diagnostic and probing tools
+        tcpdump traceroute netcat-openbsd nmap telnet whois mtr-tiny socat \
+        # Network performance tools
+        iperf3 speedtest-cli \
+        # Network configuration utilities
+        resolvconf bridge-utils vlan \
+        # VPN and tunneling tools
+        wireguard-tools openvpn stunnel4 \
+        # Packet analysis tools
+        tshark \
+        # Programming languages and runtimes
+        python3 python3-pip python3-venv python3-dev \
+        # Development tools
+        software-properties-common build-essential \
+        # Remote access
+        openssh-server \
+        # Localization
+        locales
+    # Note: Keeping apt cache for dev convenience
 
-RUN apt install -y curl wget nano lsb-release nano sudo bash-completion jq git screen cron
+# Install Node.js using official NodeSource repository
+RUN curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash - && \
+    apt-get install -y nodejs
 
-RUN apt install -y net-tools iputils-ping tcpdump traceroute iproute2 iptables iperf3 dnsutils speedtest-cli
-
-RUN apt install -y software-properties-common
-
-RUN apt install -y openssh-server
-
-# Installing locales
-RUN apt install -y locales
+# Configure locales
 ENV LC_ALL=en_US.UTF-8
 ENV LANG=en_US.UTF-8
 RUN locale-gen en_US.UTF-8
 
-# Allow non-root users to run sudo command without password.
+# Configure SSH
+RUN mkdir -p /var/run/sshd
+
+# Allow non-root users to run sudo command without password
 RUN echo "ALL ALL=NOPASSWD:ALL" > /etc/sudoers.d/01-allow-sudo
 
 COPY scripts/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
 
 ENV LOG_FILE=/dev/null
 
 # Reset DEBIAN_FRONTEND
 ENV DEBIAN_FRONTEND=""
 
+EXPOSE 22
+
 CMD ["/entrypoint.sh"]

scripts/entrypoint.sh

@@ -1,33 +1,78 @@
 #!/usr/bin/env bash
 set -x
 
-term_handler() {
-  eval $USER_COMMAND_EXIT
-  eval $SYS_COMMAND_EXIT
+# Gracefully update package lists if network is available
+echo "Checking network connectivity..."
+if ping -c 1 -W 5 8.8.8.8 >/dev/null 2>&1 || ping -c 1 -W 5 1.1.1.1 >/dev/null 2>&1; then
+    echo "Network detected, refreshing package lists..."
+    if sudo apt update; then
+        echo "Package lists updated successfully"
+    else
+        echo "Warning: apt update failed despite network connectivity"
+        echo "Falling back to cached package lists"
+    fi
+else
+    echo "No network connectivity detected, using cached package lists"
+fi
 
-  exit 143; # 128 + 15 -- SIGTERM
+# Global variable to track background processes
+TAIL_PID=""
+
+term_handler() {
+    echo "Received termination signal, cleaning up..."
+    
+    # Kill the tail process if it's running
+    if [[ -n "$TAIL_PID" ]]; then
+        kill "$TAIL_PID" 2>/dev/null
+    fi
+    
+    # Run user-defined exit commands
+    eval "$COMMAND_EXIT"
+    
+    echo "Cleanup completed, exiting..."
+    exit 0
 }
 
-# setup handler when the container is exited
-trap 'kill ${!}; term_handler' SIGTERM
+# Setup signal handlers for graceful shutdown
+trap 'term_handler' SIGTERM SIGINT
 
 # setup home directory for the current user. It is useful for attaching vscode with container.
 user_name=$(whoami)
 user_home="/home/$user_name"
-sudo mkdir -p $user_home
-sudo chown -R $(id -u):$(id -g) $user_home
-cp -r /etc/skel/. $user_home
 
-if [[ $LOG_FILE != "/dev/null" ]];
-then
-  sudo touch $LOG_FILE
-  sudo chown -R $(id -u):$(id -g) $LOG_FILE
+# Only create home directory if it doesn't exist (handles mounted /etc/passwd case)
+if [[ ! -d "$user_home" ]]; then
+    sudo mkdir -p "$user_home"
+    sudo chown -R "$(id -u):$(id -g)" "$user_home"
+    # Copy skeleton files only if home directory was created
+    cp -r /etc/skel/. "$user_home" 2>/dev/null || true
 fi
 
+if [[ $LOG_FILE != "/dev/null" ]]; then
+    sudo touch "$LOG_FILE"
+    sudo chown -R "$(id -u):$(id -g)" "$LOG_FILE"
+fi
+
+echo "Starting SSH service..."
 sudo service ssh start
 
-eval $USER_COMMAND_INIT
-eval $SYS_COMMAND_INIT
-eval $USER_COMMAND_SETUP
+# Run initialization commands
+eval "$COMMAND_INIT"
 
-tail -f $LOG_FILE & wait ${!}
+# Start the main process loop
+if [[ $LOG_FILE == "/dev/null" ]]; then
+    # If no log file, just wait for signals
+    echo "Container ready, waiting for signals..."
+    while true; do
+        sleep 1 &
+        wait $!
+    done
+else
+    # If log file specified, tail it
+    echo "Container ready, tailing log file: $LOG_FILE"
+    tail -f "$LOG_FILE" &
+    TAIL_PID=$!
+    
+    # Wait for the tail process or signals
+    wait $TAIL_PID
+fi