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Dockerfile

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+# Use a minimal base image for a small footprint
+FROM alpine:latest
+
+# Install necessary tools. 'dmesg' is usually available, but 'grep' is essential.
+# We also install 'util-linux' for 'dmesg' in case it's not in the base image,
+# and 'coreutils' for general shell utilities.
+RUN apk update && apk add --no-cache bash grep coreutils util-linux
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the detection script into the container
+COPY detect_hypervisor.sh .
+
+# Make the script executable
+RUN chmod +x detect_hypervisor.sh
+
+# Command to run the script when the container starts
+# The script needs to be run with the necessary privileges to access /sys and dmesg.
+# When running the container, the user will need to use '--privileged' or
+# map the necessary devices/directories, but for a simple check, we'll
+# rely on the host's environment when the container is run with the right flags.
+# For the purpose of this Dockerfile, we just set the entrypoint.
+ENTRYPOINT ["/app/detect_hypervisor.sh"]
+
+# Note: The script relies on reading system files like /sys/hypervisor/microsoft
+# and the output of 'dmesg'. To make this work inside a Docker container,
+# the container must be run with specific flags, typically:
+# docker run --rm -v /sys:/sys:ro -v /dev/kmsg:/dev/kmsg:ro --privileged <image_name>
+# I will include these instructions in the final delivery.

detect_hypervisor.sh

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+#!/bin/bash
+
+# Function to check for Hyper-V
+check_hyperv() {
+    # Check for the presence of the Hyper-V specific file system entry
+    if [ -d "/sys/hypervisor/microsoft" ]; then
+        echo "Hypervisor: Hyper-V"
+        return 0
+    fi
+
+    # Fallback check using dmesg for "Hyper-V"
+    if dmesg | grep -qi "Hyper-V"; then
+        echo "Hypervisor: Hyper-V (via dmesg)"
+        return 0
+    fi
+
+    # Fallback check using dmidecode (requires dmidecode to be installed and run with sudo/root)
+    # Since we are in a Docker container, we'll assume a minimal environment,
+    # so we'll rely on the /sys check first.
+    # if sudo dmidecode -s system-product-name | grep -qi "Virtual Machine"; then
+    #     if sudo dmidecode -s system-manufacturer | grep -qi "Microsoft Corporation"; then
+    #         echo "Hypervisor: Hyper-V (via dmidecode)"
+    #         return 0
+    #     fi
+    # fi
+
+    return 1
+}
+
+# Function to check for KVM
+check_kvm() {
+    # Check for the presence of the KVM device file
+    if [ -c "/dev/kvm" ]; then
+        echo "Hypervisor: KVM (via /dev/kvm)"
+        return 0
+    fi
+
+    # Check for KVM in the system product name
+    if [ -f "/sys/class/dmi/id/product_name" ] && grep -qi "KVM" "/sys/class/dmi/id/product_name"; then
+        echo "Hypervisor: KVM"
+        return 0
+    fi
+
+    # Fallback check using dmesg for "KVM"
+    if dmesg | grep -qi "KVM"; then
+        echo "Hypervisor: KVM (via dmesg)"
+        return 0
+    fi
+
+    return 1
+}
+
+# Main detection logic
+if check_hyperv; then
+    exit 0
+elif check_kvm; then
+    exit 0
+else
+    # Check for other common hypervisors as a bonus
+    if [ -f "/sys/class/dmi/id/product_name" ] && grep -qi "VMware" "/sys/class/dmi/id/product_name"; then
+        echo "Hypervisor: VMware"
+    elif [ -f "/sys/class/dmi/id/product_name" ] && grep -qi "VirtualBox" "/sys/class/dmi/id/product_name"; then
+        echo "Hypervisor: VirtualBox"
+    elif [ -f "/sys/class/dmi/id/product_name" ] && grep -qi "QEMU" "/sys/class/dmi/id/product_name"; then
+        echo "Hypervisor: QEMU"
+    else
+        echo "Hypervisor: Unknown or Bare Metal"
+    fi
+    exit 1
+fi