use erofs for headful image

images/chromium-headful/Kraftfile

@@ -3,10 +3,10 @@ spec: v0.6
 runtime: index.unikraft.io/official/base-compat:latest
 
 labels:
-  cloud.unikraft.v1.instances/scale_to_zero.policy: "on"
+  cloud.unikraft.v1.instances/scale_to_zero.policy: "idle"
   cloud.unikraft.v1.instances/scale_to_zero.stateful: "true"
-  cloud.unikraft.v1.instances/scale_to_zero.cooldown_time_ms: 4000
+  cloud.unikraft.v1.instances/scale_to_zero.cooldown_time_ms: 5000
 
-rootfs: ./Dockerfile
+rootfs: ./initrd
 
 cmd: ["/wrapper.sh"]

images/chromium-headful/build-unikernel.sh

@@ -1,16 +1,34 @@
 #!/usr/bin/env bash
 
 source common.sh
+source ../../shared/erofs-utils.sh
+
+# Ensure the mkfs.erofs tool is available
+if ! check_mkfs_erofs; then
+    echo "mkfs.erofs is not installed. Installing erofs-utils..."
+    install_erofs_utils
+fi
+
 set -euo pipefail  
 
+# Build the root file system
 source ../../shared/start-buildkit.sh
-
+rm -rf ./.rootfs || true
 # Build the API binary
 source ../../shared/build-server.sh "$(pwd)/bin"
+app_name=chromium-headful-build
+docker build --platform linux/amd64 -t "$IMAGE" .
+docker rm cnt-"$app_name" || true
+docker create --platform linux/amd64 --name cnt-"$app_name" "$IMAGE" /bin/sh
+docker cp cnt-"$app_name":/ ./.rootfs
+rm -f initrd || true
+mkfs.erofs --all-root -d2 -E noinline_data -b 4096 initrd ./.rootfs
 
+# Package the unikernel (and the new initrd) to KraftCloud
 kraft pkg \
   --name $UKC_INDEX/$IMAGE \
-  --plat kraftcloud --arch x86_64 \
+  --plat kraftcloud \
+  --arch x86_64 \
   --strategy overwrite \
   --push \
   .

images/chromium-headless/build-unikernel.sh

@@ -1,46 +1,10 @@
 #!/usr/bin/env bash
 
 source common.sh
+source ../../shared/erofs-utils.sh
 
-# Function to check if mkfs.erofs is available
-check_mkfs_erofs() {
-    if command -v mkfs.erofs &>/dev/null; then
-        echo "mkfs.erofs is already installed."
-        return 0
-    else
-        echo "mkfs.erofs is not installed."
-        return 1
-    fi
-}
-
-# Function to install erofs-utils package
-install_erofs_utils() {
-    if command -v apt-get &>/dev/null; then
-        echo "Detected Ubuntu/Debian-based system. Installing erofs-utils..."
-        sudo apt update
-        sudo apt install -y erofs-utils
-    elif command -v dnf &>/dev/null; then
-        echo "Detected Fedora-based system. Installing erofs-utils..."
-        sudo dnf install -y erofs-utils
-    elif command -v yum &>/dev/null; then
-        echo "Detected CentOS/RHEL-based system. Installing erofs-utils..."
-        sudo yum install -y erofs-utils
-    elif [[ "$OSTYPE" == "darwin"* ]]; then
-        if command -v brew &>/dev/null; then
-            echo "Detected macOS. Installing erofs-utils..."
-            brew install erofs-utils
-        else
-            echo "Homebrew (brew) not found. Please install Homebrew first."
-            exit 1
-        fi
-    else
-        echo "Unsupported operating system or package manager. Please install erofs-utils manually."
-        exit 1
-    fi
-}
-
-check_mkfs_erofs
-if [ $? -ne 0 ]; then
+# Ensure the mkfs.erofs tool is present
+if ! check_mkfs_erofs; then
     echo "mkfs.erofs is not installed. Installing erofs-utils..."
     install_erofs_utils
 fi
@@ -50,11 +14,9 @@ set -euo pipefail
 cd image/
 
 # Build the root file system
+source ../../shared/start-buildkit.sh
 rm -rf ./.rootfs || true
-
-# Load configuration
-app_name=chromium-headless-test
-
+app_name=chromium-headless-build
 docker build --platform linux/amd64 -t "$IMAGE" .
 docker rm cnt-"$app_name" || true
 docker create --platform linux/amd64 --name cnt-"$app_name" "$IMAGE" /bin/sh

shared/erofs-utils.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# erofs-utils.sh
+# ----------------
+# Shared utility functions for verifying that mkfs.erofs (provided by the
+# erofs-utils package) is available on the host and installing it when it is
+# missing.  This script is meant to be sourced by other build scripts.
+
+set -e -o pipefail
+
+# Returns 0 if mkfs.erofs is on the PATH, 1 otherwise.
+check_mkfs_erofs() {
+    if command -v mkfs.erofs &>/dev/null; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+# Installs the erofs-utils package using the host's package manager.
+install_erofs_utils() {
+    if command -v apt-get &>/dev/null; then
+        echo "Detected Debian/Ubuntu system. Installing erofs-utils …"
+        sudo apt update
+        sudo apt install -y erofs-utils
+    elif command -v dnf &>/dev/null; then
+        echo "Detected Fedora system. Installing erofs-utils …"
+        sudo dnf install -y erofs-utils
+    elif command -v yum &>/dev/null; then
+        echo "Detected CentOS/RHEL system. Installing erofs-utils …"
+        sudo yum install -y erofs-utils
+    elif [[ "$OSTYPE" == "darwin"* ]]; then
+        if command -v brew &>/dev/null; then
+            echo "Detected macOS system. Installing erofs-utils via Homebrew …"
+            brew install erofs-utils
+        else
+            echo "Homebrew is required but not found. Please install Homebrew first."
+            exit 1
+        fi
+    else
+        echo "Unsupported operating system or package manager; please install erofs-utils manually."
+        exit 1
+    fi
+}