change for version

src/docker-in-docker/install.sh

@@ -482,12 +482,12 @@ set -e
 AZURE_DNS_AUTO_DETECTION=${AZURE_DNS_AUTO_DETECTION}
 DOCKER_DEFAULT_ADDRESS_POOL=${DOCKER_DEFAULT_ADDRESS_POOL}
 DOCKER_DEFAULT_IP6_TABLES=${IP6_TABLES}
-DOCKER_VERSION=${DOCKER_VERSION}
+DOCKER_INSTALL_VERSION=${DOCKER_VERSION}
 EOF
 
 tee -a /usr/local/share/docker-init.sh > /dev/null \
 << 'EOF'
-dockerd_start="AZURE_DNS_AUTO_DETECTION=${AZURE_DNS_AUTO_DETECTION} DOCKER_DEFAULT_ADDRESS_POOL=${DOCKER_DEFAULT_ADDRESS_POOL} DOCKER_DEFAULT_IP6_TABLES=${DOCKER_DEFAULT_IP6_TABLES} DOCKER_VERSION=${DOCKER_VERSION} $(cat << 'INNEREOF'
+dockerd_start="AZURE_DNS_AUTO_DETECTION=${AZURE_DNS_AUTO_DETECTION} DOCKER_DEFAULT_ADDRESS_POOL=${DOCKER_DEFAULT_ADDRESS_POOL} DOCKER_DEFAULT_IP6_TABLES=${DOCKER_DEFAULT_IP6_TABLES} DOCKER_INSTALL_VERSION=${DOCKER_INSTALL_VERSION} $(cat << 'INNEREOF'
     # explicitly remove dockerd and containerd PID file to ensure that it can start properly if it was stopped uncleanly
     find /run /var/run -iname 'docker*.pid' -delete || :
     find /run /var/run -iname 'container*.pid' -delete || :
@@ -563,12 +563,11 @@ dockerd_start="AZURE_DNS_AUTO_DETECTION=${AZURE_DNS_AUTO_DETECTION} DOCKER_DEFAU
     else
         DEFAULT_ADDRESS_POOL="--default-address-pool $DOCKER_DEFAULT_ADDRESS_POOL"
     fi
-
-    semver_regex="^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)*)?$"
-    if echo "$DOCKER_VERSION" | grep -Eq "$semver_regex"; then
-        major_version=$(echo $DOCKER_VERSION | cut -d. -f1)
-        if [ "$major_version" -le 20 ]; then
-            if [ $DOCKER_DEFAULT_IP6_TABLES = true ]; then
+    semver_regex="^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?$"
+    if echo "$DOCKER_INSTALL_VERSION" | grep -Eq "^-?[0-9]+$" || echo "$DOCKER_INSTALL_VERSION" | grep -Eq "$semver_regex"; then
+        major_version=$(echo $DOCKER_INSTALL_VERSION | cut -d. -f1)
+        if [ "$major_version" -le 26 ]; then
+            if [ "${DOCKER_DEFAULT_IP6_TABLES}" = true ]; then
                 mkdir -p /etc/docker
                 # Create the daemon.json file for enabling ip6tables
                 tee /etc/docker/daemon.json > /dev/null <<JSON_EOF

test/docker-in-docker/docker_build_older_enable_ip6tables.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Definition specific tests
+check "docker-buildx" docker buildx version
+check "docker-build" docker build ./
+check "docker-buildx" bash -c "docker buildx version"
+check "docker-buildx-path" bash -c "ls -la /usr/libexec/docker/cli-plugins/docker-buildx"
+ip6tablesCheck() {
+    if command -v ip6tables > /dev/null 2>&1; then
+        if ip6tables -L > /dev/null 2>&1; then
+            echo "✔️ ip6tables is enabled."
+        else
+            echo "❌ ip6tables is disabled."
+        fi
+    else
+        echo "❕ip6tables command not found. ❕"
+    fi
+}
+
+check "ip6tables" ip6tablesCheck
+
+# Report result
+reportResults

test/docker-in-docker/scenarios.json

@@ -84,6 +84,18 @@
         },
         "remoteUser": "node"
     },
+    "docker_build_older_enable_ip6tables": {
+        "image": "mcr.microsoft.com/devcontainers/javascript-node:0-18",
+        "features": {
+            "docker-in-docker": {
+                "version": "20.10.24",
+                "moby": "false",
+                "dockerDashComposeVersion": "v2",
+                "ip6tables": true
+            }
+        },
+        "remoteUser": "node"
+    },
     "docker_build_no_compose": {
         "image": "mcr.microsoft.com/devcontainers/javascript-node:0-18",
         "features": {