Adding azure-linux OS support for docker-in-docker feature

src/docker-in-docker/devcontainer-feature.json

@@ -1,6 +1,6 @@
 {
     "id": "docker-in-docker",
-    "version": "2.12.4",
+    "version": "2.13.0",
     "name": "Docker (Docker-in-Docker)",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/docker-in-docker",
     "description": "Create child containers *inside* a container, independent from the host's docker instance. Installs Docker extension in the container along with needed CLIs.",

test/docker-in-docker/azure_linux.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# OS identification (optional, can fail gracefully)
+check "azure os detection" bash -c "cat /etc/os-release | grep -i azure || echo 'Not Azure Linux, but test can continue'"
+
+# Core Docker functionality
+check "docker version" docker --version
+check "docker daemon running" docker info
+
+# Docker init script (if using docker-in-docker feature)
+check "docker init script exists" test -f "/usr/local/share/docker-init.sh"
+
+# Basic functionality test
+check "docker container test" docker run --rm alpine echo "test successful"
+
+# The main Azure Linux specific test - DNS flag should NOT be present
+check "dns flag should not be present" test ! "$(ps -ax | grep -v grep | grep -E 'dockerd.+\-\-dns')"
+
+# Report result
+reportResults

test/docker-in-docker/azure_linux_docker_ce.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+echo "=== Azure Linux Docker CE Test ==="
+
+echo "1. Verifying OS identification..."
+cat /etc/os-release | grep -i azure
+
+echo "2. Checking Docker installation..."
+docker --version || {
+    echo "ERROR: Docker is not installed"
+    exit 1
+}
+
+echo "3. Checking if Docker binaries exist..."
+which dockerd || echo "dockerd not in PATH"
+ls -la /usr/bin/docker* || echo "No docker binaries in /usr/bin"
+ls -la /usr/local/bin/docker* || echo "No docker binaries in /usr/local/bin"
+
+echo "4. Checking Docker service files..."
+ls -la /etc/systemd/system/docker* || echo "No systemd docker files"
+ls -la /usr/lib/systemd/system/docker* || echo "No system docker service files"
+
+echo "6. Checking Docker daemon status..."
+if ! docker info >/dev/null 2>&1; then
+    echo "Docker daemon not running, starting it..."
+
+    # Check if docker-init script exists
+    if [ -f "/usr/local/share/docker-init.sh" ]; then
+        echo "Starting Docker using docker-init.sh..."
+
+        # Clear any existing log
+        rm -f /tmp/dockerd.log
+
+        # Start docker-init in background
+        nohup /usr/local/share/docker-init.sh > /tmp/docker-init.log 2>&1 &
+
+        # Wait for Docker to start with better debugging
+        echo "Waiting for Docker daemon to start..."
+        for i in {1..30}; do
+            if docker info >/dev/null 2>&1; then
+                echo "Docker daemon started successfully"
+                break
+            fi
+            echo "Waiting... ($i/30)"
+
+            # Show dockerd logs if available
+            if [ -f "/tmp/dockerd.log" ]; then
+                echo "--- Recent dockerd.log entries ---"
+                tail -5 /tmp/dockerd.log || echo "Could not read dockerd.log"
+                echo "--- End of dockerd.log ---"
+            fi
+
+            sleep 2
+        done
+
+        # Final check with detailed error reporting
+        if ! docker info >/dev/null 2>&1; then
+            echo "ERROR: Docker daemon failed to start after 60 seconds"
+            echo ""
+            echo "=== DEBUGGING INFORMATION ==="
+            echo ""
+            echo "1. Docker init log:"
+            cat /tmp/docker-init.log 2>/dev/null || echo "No docker-init.log found"
+            echo ""
+            echo "2. Docker daemon log:"
+            cat /tmp/dockerd.log 2>/dev/null || echo "No dockerd.log found"
+            echo ""
+            echo "3. Process list:"
+            ps aux | grep -E "(docker|containerd)" | grep -v grep || echo "No docker/containerd processes found"
+            echo ""
+            echo "4. Network interfaces:"
+            ip addr show || ifconfig || echo "Could not get network info"
+            echo ""
+            echo "5. Mount points:"
+            mount | grep -E "(docker|container)" || echo "No docker-related mounts"
+            echo ""
+            echo "6. SELinux status:"
+            if command -v getenforce >/dev/null 2>&1; then
+                getenforce || echo "SELinux command failed"
+            else
+                echo "SELinux tools not available"
+            fi
+            echo ""
+            echo "7. Available storage:"
+            df -h /var/lib/docker 2>/dev/null || df -h / || echo "Could not check storage"
+            echo ""
+            echo "8. System resources:"
+            free -h || echo "Could not check memory"
+            echo ""
+            echo "=== END DEBUGGING ==="
+            exit 1
+        fi
+    else
+        echo "ERROR: docker-init.sh not found at /usr/local/share/docker-init.sh"
+        ls -la /usr/local/share/ || echo "Could not list /usr/local/share/"
+        exit 1
+    fi
+else
+    echo "Docker daemon is already running"
+fi
+
+echo "7. Testing basic Docker functionality..."
+docker info | head -10
+
+echo "8. Testing container execution..."
+docker run --rm alpine echo "Basic container test successful"
+
+echo "=== Docker CE test completed successfully ==="

test/docker-in-docker/cbl_mariner.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Simple test script for cbl_mariner scenario (Moby = true)
+# Run with: sudo bash script_cbl_mariner.sh
+
+set -e
+
+echo "=== Testing cbl_mariner scenario (Moby) ==="
+
+# Set environment variables for the scenario
+export VERSION="latest"
+export MOBY="true"
+export AZUREDNSAUTODETECTION="false"
+
+# Source OS info
+. /etc/os-release
+echo "OS: $ID $VERSION_ID"
+
+# Check package manager
+if type tdnf > /dev/null 2>&1; then
+    echo "Using tdnf"
+else
+    echo "ERROR: tdnf not found"
+    exit 1
+fi
+
+# Validate
+if command -v docker > /dev/null 2>&1; then
+    docker --version
+    echo "SUCCESS: Docker installed"
+else
+    echo "ERROR: Docker not installed"
+    exit 1
+fi
+
+echo "=== cbl_mariner test passed ==="

test/docker-in-docker/cbl_mariner_docker_ce.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+# test script for cbl_mariner_docker_ce scenario (Moby = false)
+
+set -e
+
+echo "=== Testing cbl_mariner_docker_ce scenario (Docker CE) ==="
+
+# Set environment variables for the scenario
+export VERSION="latest"
+export MOBY="false"
+export AZUREDNSAUTODETECTION="false"
+
+# Source OS info
+. /etc/os-release
+echo "OS: $ID $VERSION_ID"
+
+# Check package manager
+if type tdnf > /dev/null 2>&1; then
+    echo "Using tdnf"
+else
+    echo "ERROR: tdnf not found"
+    exit 1
+fi
+
+# Validate
+if command -v docker > /dev/null 2>&1; then
+    docker --version
+    echo "SUCCESS: Docker installed"
+else
+    echo "ERROR: Docker not installed"
+    exit 1
+fi
+
+echo "=== cbl_mariner_docker_ce test passed ==="

test/docker-in-docker/scenarios.json

@@ -177,5 +177,45 @@
         },
         "remoteUser": "vscode",
         "onCreateCommand": "docker ps && sleep 5s && docker ps"
+    },
+    "azure_linux": {
+        "image": "mcr.microsoft.com/azurelinux/base/core:3.0",
+        "features": {
+            "docker-in-docker": {
+                "version": "latest",
+                "moby": "true",
+                "azureDnsAutoDetection": false
+            }
+        }
+    },
+    "azure_linux_docker_ce": {
+        "image": "mcr.microsoft.com/azurelinux/base/core:3.0",
+        "features": {
+            "docker-in-docker": {
+                "version": "latest",
+                "moby": "false",
+                "azureDnsAutoDetection": false
+            }
+        }
+    },
+    "cbl_mariner": {
+        "image": "mcr.microsoft.com/cbl-mariner/base/core:2.0",
+        "features": {
+            "docker-in-docker": {
+                "version": "latest",
+                "moby": "true",
+                "azureDnsAutoDetection": false
+            }
+        }
+    },
+    "cbl_mariner_docker_ce": {
+        "image": "mcr.microsoft.com/cbl-mariner/base/core:2.0",
+        "features": {
+            "docker-in-docker": {
+                "version": "latest",
+                "moby": "false",
+                "azureDnsAutoDetection": false
+            }
+        }
     }
 }