40ed108dd5
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
93 lines
2.7 KiB
Bash
Executable File
93 lines
2.7 KiB
Bash
Executable File
#!/bin/bash
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# Build the Volt custom initramfs (no Alpine, no BusyBox)
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set -e
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
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BINARY="$PROJECT_DIR/target/x86_64-unknown-linux-musl/release/volt-init"
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OUTPUT="$SCRIPT_DIR/initramfs.cpio.gz"
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# Colors
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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CYAN='\033[0;36m'
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NC='\033[0m'
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echo -e "${CYAN}=== Building Volt Initramfs ===${NC}"
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# Build volt-init if needed
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if [ ! -f "$BINARY" ] || [ "$1" = "--rebuild" ]; then
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echo -e "${CYAN}Building volt-init...${NC}"
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cd "$PROJECT_DIR"
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source ~/.cargo/env
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RUSTFLAGS="-C target-feature=+crt-static -C relocation-model=static -C target-cpu=x86-64" \
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cargo build --release --target x86_64-unknown-linux-musl -p volt-init
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fi
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if [ ! -f "$BINARY" ]; then
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echo -e "${RED}ERROR: volt-init binary not found at $BINARY${NC}"
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echo "Run: cd rootfs/volt-init && cargo build --release --target x86_64-unknown-linux-musl"
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exit 1
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fi
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echo -e "${GREEN}Binary: $(ls -lh "$BINARY" | awk '{print $5}')${NC}"
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# Create rootfs structure
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WORK=$(mktemp -d)
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trap "rm -rf $WORK" EXIT
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mkdir -p "$WORK"/{bin,dev,proc,sys,etc,tmp,run,var/log}
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# Our init binary — the ONLY binary in the entire rootfs
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cp "$BINARY" "$WORK/init"
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chmod 755 "$WORK/init"
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# Create /dev/console node (required for kernel to set up stdin/stdout/stderr)
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# console = char device, major 5, minor 1
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sudo mknod "$WORK/dev/console" c 5 1
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sudo chmod 600 "$WORK/dev/console"
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# Create /dev/ttyS0 for serial console
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sudo mknod "$WORK/dev/ttyS0" c 4 64
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sudo chmod 660 "$WORK/dev/ttyS0"
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# Create /dev/null
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sudo mknod "$WORK/dev/null" c 1 3
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sudo chmod 666 "$WORK/dev/null"
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# Minimal /etc
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echo "volt-vmm" > "$WORK/etc/hostname"
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cat > "$WORK/etc/os-release" << 'EOF'
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NAME="Volt"
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ID=volt-vmm
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VERSION="0.1.0"
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PRETTY_NAME="Volt VM (Custom Rust Userspace)"
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HOME_URL="https://github.com/volt-vmm/volt-vmm"
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EOF
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# Build cpio archive (need root to preserve device nodes)
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cd "$WORK"
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sudo find . -print0 | sudo cpio --null -o -H newc --quiet 2>/dev/null | gzip -9 > "$OUTPUT"
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# Report
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SIZE=$(stat -c %s "$OUTPUT" 2>/dev/null || stat -f %z "$OUTPUT")
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SIZE_KB=$((SIZE / 1024))
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echo -e "${GREEN}=== Initramfs Built ===${NC}"
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echo -e " Output: $OUTPUT"
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echo -e " Size: ${SIZE_KB}KB ($(ls -lh "$OUTPUT" | awk '{print $5}'))"
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echo -e " Binary: $(ls -lh "$BINARY" | awk '{print $5}') (static musl)"
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echo -e " Contents: $(find . | wc -l) files"
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# Check goals
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if [ "$SIZE_KB" -lt 500 ]; then
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echo -e " ${GREEN}✓ Under 500KB goal${NC}"
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else
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echo -e " ${RED}✗ Over 500KB goal (${SIZE_KB}KB)${NC}"
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fi
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echo ""
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echo "Test with:"
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echo " ./target/release/volt-vmm --kernel kernels/vmlinux --initrd rootfs/initramfs.cpio.gz -m 128M --cmdline \"console=ttyS0 reboot=k panic=1\""
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