Volt VMM (Neutron Stardust): source-available under AGPSL v5.0

KVM-based microVMM for the Volt platform:
- Sub-second VM boot times
- Minimal memory footprint
- Landlock LSM + seccomp security
- Virtio device support
- Custom kernel management

Copyright (c) Armored Gates LLC. All rights reserved.
Licensed under AGPSL v5.0

rootfs/build-initramfs.sh

@@ -0,0 +1,92 @@
+#!/bin/bash
+# Build the Volt custom initramfs (no Alpine, no BusyBox)
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+BINARY="$PROJECT_DIR/target/x86_64-unknown-linux-musl/release/volt-init"
+OUTPUT="$SCRIPT_DIR/initramfs.cpio.gz"
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+CYAN='\033[0;36m'
+NC='\033[0m'
+
+echo -e "${CYAN}=== Building Volt Initramfs ===${NC}"
+
+# Build volt-init if needed
+if [ ! -f "$BINARY" ] || [ "$1" = "--rebuild" ]; then
+    echo -e "${CYAN}Building volt-init...${NC}"
+    cd "$PROJECT_DIR"
+    source ~/.cargo/env
+    RUSTFLAGS="-C target-feature=+crt-static -C relocation-model=static -C target-cpu=x86-64" \
+        cargo build --release --target x86_64-unknown-linux-musl -p volt-init
+fi
+
+if [ ! -f "$BINARY" ]; then
+    echo -e "${RED}ERROR: volt-init binary not found at $BINARY${NC}"
+    echo "Run: cd rootfs/volt-init && cargo build --release --target x86_64-unknown-linux-musl"
+    exit 1
+fi
+
+echo -e "${GREEN}Binary: $(ls -lh "$BINARY" | awk '{print $5}')${NC}"
+
+# Create rootfs structure
+WORK=$(mktemp -d)
+trap "rm -rf $WORK" EXIT
+
+mkdir -p "$WORK"/{bin,dev,proc,sys,etc,tmp,run,var/log}
+
+# Our init binary — the ONLY binary in the entire rootfs
+cp "$BINARY" "$WORK/init"
+chmod 755 "$WORK/init"
+
+# Create /dev/console node (required for kernel to set up stdin/stdout/stderr)
+# console = char device, major 5, minor 1
+sudo mknod "$WORK/dev/console" c 5 1
+sudo chmod 600 "$WORK/dev/console"
+
+# Create /dev/ttyS0 for serial console
+sudo mknod "$WORK/dev/ttyS0" c 4 64
+sudo chmod 660 "$WORK/dev/ttyS0"
+
+# Create /dev/null
+sudo mknod "$WORK/dev/null" c 1 3
+sudo chmod 666 "$WORK/dev/null"
+
+# Minimal /etc
+echo "volt-vmm" > "$WORK/etc/hostname"
+
+cat > "$WORK/etc/os-release" << 'EOF'
+NAME="Volt"
+ID=volt-vmm
+VERSION="0.1.0"
+PRETTY_NAME="Volt VM (Custom Rust Userspace)"
+HOME_URL="https://github.com/volt-vmm/volt-vmm"
+EOF
+
+# Build cpio archive (need root to preserve device nodes)
+cd "$WORK"
+sudo find . -print0 | sudo cpio --null -o -H newc --quiet 2>/dev/null | gzip -9 > "$OUTPUT"
+
+# Report
+SIZE=$(stat -c %s "$OUTPUT" 2>/dev/null || stat -f %z "$OUTPUT")
+SIZE_KB=$((SIZE / 1024))
+
+echo -e "${GREEN}=== Initramfs Built ===${NC}"
+echo -e "  Output:    $OUTPUT"
+echo -e "  Size:      ${SIZE_KB}KB ($(ls -lh "$OUTPUT" | awk '{print $5}'))"
+echo -e "  Binary:    $(ls -lh "$BINARY" | awk '{print $5}') (static musl)"
+echo -e "  Contents:  $(find . | wc -l) files"
+
+# Check goals
+if [ "$SIZE_KB" -lt 500 ]; then
+    echo -e "  ${GREEN}✓ Under 500KB goal${NC}"
+else
+    echo -e "  ${RED}✗ Over 500KB goal (${SIZE_KB}KB)${NC}"
+fi
+
+echo ""
+echo "Test with:"
+echo "  ./target/release/volt-vmm --kernel kernels/vmlinux --initrd rootfs/initramfs.cpio.gz -m 128M --cmdline \"console=ttyS0 reboot=k panic=1\""