Initial commit: Alpine Zero-OS initramfs build system with cleaned Docker configuration

scripts/build-smart.sh

@@ -0,0 +1,106 @@
+#!/bin/sh
+set -e
+
+CACHE_DIR="/build/cache"
+KERNEL_VERSION=$(cat /build/configs/kernel-version)
+
+echo "[+] Smart build with Docker layer caching..."
+
+# Function to check if we need to rebuild a stage
+needs_rebuild() {
+    local stage="$1"
+    local trigger_files="$2"
+    local cache_marker="$CACHE_DIR/${stage}-marker"
+    
+    # If cache marker doesn't exist, rebuild
+    if [ ! -f "$cache_marker" ]; then
+        echo "    $stage: No cache marker found, rebuild needed"
+        return 0
+    fi
+    
+    # Check if any trigger files are newer than cache marker
+    for file in $trigger_files; do
+        if [ -f "$file" ] && [ "$file" -nt "$cache_marker" ]; then
+            echo "    $stage: $file changed, rebuild needed"
+            return 0
+        fi
+    done
+    
+    echo "    $stage: Cache valid, skipping"
+    return 1
+}
+
+# Function to mark stage as completed
+mark_completed() {
+    local stage="$1"
+    mkdir -p "$CACHE_DIR"
+    touch "$CACHE_DIR/${stage}-marker"
+}
+
+echo "  Checking cache status..."
+
+# Check each build stage
+REBUILD_COMPONENTS=false
+REBUILD_KERNEL=false
+REBUILD_INITRAMFS=false
+
+# Components need rebuild if:
+# - Component source repos have updates (we'll assume weekly refresh)
+# - compile-components.sh script changed
+if needs_rebuild "components" "/build/scripts/compile-components.sh"; then
+    REBUILD_COMPONENTS=true
+fi
+
+# Kernel needs rebuild if:
+# - Kernel version changed
+# - Kernel config changed
+# - build-kernel.sh script changed
+if needs_rebuild "kernel" "/build/configs/kernel-version /build/configs/kernel-config-generic /build/scripts/build-kernel.sh"; then
+    REBUILD_KERNEL=true
+fi
+
+# Initramfs always rebuilds (it's fast and contains user scripts)
+REBUILD_INITRAMFS=true
+
+echo ""
+echo "  Build plan:"
+echo "    Components: $([ "$REBUILD_COMPONENTS" = "true" ] && echo "REBUILD" || echo "CACHED")"
+echo "    Kernel: $([ "$REBUILD_KERNEL" = "true" ] && echo "REBUILD" || echo "CACHED")"
+echo "    Initramfs: REBUILD (always)"
+echo ""
+
+# Phase 1: Components (if needed)
+if [ "$REBUILD_COMPONENTS" = "true" ]; then
+    echo "[+] Building Zero-OS components from source..."
+    /build/scripts/compile-components.sh
+    mark_completed "components"
+else
+    echo "[+] Using cached Zero-OS components"
+fi
+
+# Phase 2: Kernel (if needed)
+if [ "$REBUILD_KERNEL" = "true" ]; then
+    echo "[+] Building kernel ${KERNEL_VERSION}..."
+    # Only download and build kernel, not embed initramfs yet
+    /build/scripts/build-kernel.sh --kernel-only
+    mark_completed "kernel"
+else
+    echo "[+] Using cached kernel ${KERNEL_VERSION}"
+fi
+
+# Phase 3: Initramfs (always - fast)
+echo "[+] Installing Alpine packages..."
+/build/scripts/install-packages.sh
+
+echo "[+] Setting up initramfs structure..."
+/build/scripts/setup-initramfs.sh
+
+# Phase 4: Final kernel assembly (embed initramfs)
+echo "[+] Embedding initramfs into kernel..."
+/build/scripts/build-kernel.sh --embed-only
+
+echo ""
+echo "[+] Smart build completed!"
+echo "    Components: $([ "$REBUILD_COMPONENTS" = "true" ] && echo "rebuilt" || echo "cached")"
+echo "    Kernel: $([ "$REBUILD_KERNEL" = "true" ] && echo "rebuilt" || echo "cached")"
+echo "    Total time saved by caching: significant!"