Add customize workflow
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246
customize.sh
Executable file
246
customize.sh
Executable file
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#!/usr/bin/env bash
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set -euo pipefail
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log() {
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printf '[customize] %s\n' "$*"
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}
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usage() {
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cat <<'EOF'
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Usage: ./customize.sh <output-rootfs> [--size <size>]
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Creates a copy of rootfs.ext4, optionally resizes it, boots a VM with the
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copy as a writable rootfs, then applies base configuration and packages.
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EOF
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}
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parse_size() {
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local raw="$1"
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if [[ "$raw" =~ ^([0-9]+)([KMG])?$ ]]; then
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local num="${BASH_REMATCH[1]}"
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local unit="${BASH_REMATCH[2]}"
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case "$unit" in
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K) echo $((num * 1024)) ;;
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M|"") echo $((num * 1024 * 1024)) ;;
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G) echo $((num * 1024 * 1024 * 1024)) ;;
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esac
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return 0
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fi
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return 1
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}
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DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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STATE="$DIR/state"
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VM_ROOT="$STATE/vms"
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mkdir -p "$VM_ROOT"
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BASE_ROOTFS="$DIR/rootfs.ext4"
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FC_BIN="$DIR/firecracker"
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KERNEL="$DIR/vmlinux"
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SSH_KEY="$DIR/id_ed25519"
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BR_DEV="br-fc"
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BR_IP="172.16.0.1"
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CIDR="24"
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DNS_SERVER="1.1.1.1"
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OUT_ROOTFS=""
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SIZE_SPEC=""
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--size)
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SIZE_SPEC="${2:-}"
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shift 2
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;;
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-h|--help)
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usage
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exit 0
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;;
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*)
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if [[ -z "$OUT_ROOTFS" ]]; then
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OUT_ROOTFS="$1"
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shift
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else
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log "unknown option: $1"
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usage
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exit 1
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fi
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;;
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esac
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done
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if [[ -z "$OUT_ROOTFS" ]]; then
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usage
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exit 1
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fi
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if [[ ! -f "$BASE_ROOTFS" ]]; then
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log "base rootfs not found: $BASE_ROOTFS"
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exit 1
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fi
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if [[ -e "$OUT_ROOTFS" ]]; then
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log "output rootfs already exists: $OUT_ROOTFS"
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exit 1
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fi
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if ! command -v resize2fs >/dev/null 2>&1; then
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log "resize2fs required"
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exit 1
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fi
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log "copying base rootfs to $OUT_ROOTFS"
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cp --reflink=auto "$BASE_ROOTFS" "$OUT_ROOTFS"
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if [[ -n "$SIZE_SPEC" ]]; then
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SIZE_BYTES="$(parse_size "$SIZE_SPEC")"
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BASE_BYTES="$(stat -c%s "$BASE_ROOTFS")"
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if [[ -z "$SIZE_BYTES" || "$SIZE_BYTES" -lt "$BASE_BYTES" ]]; then
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log "size must be >= base image size"
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exit 1
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fi
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log "resizing rootfs to $SIZE_SPEC"
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truncate -s "$SIZE_BYTES" "$OUT_ROOTFS"
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e2fsck -p -f "$OUT_ROOTFS" >/dev/null
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resize2fs "$OUT_ROOTFS" >/dev/null
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fi
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VM_ID="$(head -c 32 /dev/urandom | xxd -p -c 256)"
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VM_TAG="${VM_ID:0:8}"
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VM_NAME="customize-${VM_TAG}"
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VM_DIR="$VM_ROOT/$VM_ID"
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mkdir -p "$VM_DIR"
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API_SOCK="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}/banger/fc-$VM_TAG.sock"
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LOG_FILE="$VM_DIR/firecracker.log"
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TAP_DEV="tap-fc-$VM_TAG"
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# Allocate guest IP
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NEXT_IP_FILE="$STATE/next_ip"
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NEXT_IP="$(cat "$NEXT_IP_FILE" 2>/dev/null || echo 2)"
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GUEST_IP="172.16.0.$NEXT_IP"
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echo "$((NEXT_IP + 1))" > "$NEXT_IP_FILE"
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sudo -v
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cleanup() {
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sudo kill "${FC_PID:-}" 2>/dev/null || true
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sudo ip link del "$TAP_DEV" 2>/dev/null || true
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rm -f "$API_SOCK"
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rm -rf "$VM_DIR"
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}
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trap cleanup EXIT
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sudo mkdir -p "$(dirname "$API_SOCK")"
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sudo chown "$(id -u):$(id -g)" "$(dirname "$API_SOCK")"
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# Host bridge
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if ! ip link show "$BR_DEV" >/dev/null 2>&1; then
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log "creating host bridge $BR_DEV ($BR_IP/$CIDR)"
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sudo ip link add name "$BR_DEV" type bridge
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sudo ip addr add "${BR_IP}/${CIDR}" dev "$BR_DEV"
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sudo ip link set "$BR_DEV" up
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else
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sudo ip link set "$BR_DEV" up
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fi
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log "creating tap device $TAP_DEV"
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TAP_USER="${SUDO_UID:-$(id -u)}"
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TAP_GROUP="${SUDO_GID:-$(id -g)}"
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sudo ip tuntap add dev "$TAP_DEV" mode tap user "$TAP_USER" group "$TAP_GROUP"
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sudo ip link set "$TAP_DEV" master "$BR_DEV"
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sudo ip link set "$TAP_DEV" up
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sudo ip link set "$BR_DEV" up
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log "starting firecracker process"
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rm -f "$API_SOCK"
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nohup sudo -E "$FC_BIN" --api-sock "$API_SOCK" >"$LOG_FILE" 2>&1 &
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FC_PID="$!"
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log "waiting for firecracker api socket"
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for _ in $(seq 1 200); do
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[[ -S "$API_SOCK" ]] && break
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sleep 0.02
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done
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[[ -S "$API_SOCK" ]] || { log "firecracker api socket not ready"; exit 1; }
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cat > "$VM_DIR/info" <<EOF
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id=$VM_ID
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name=$VM_NAME
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pid=$FC_PID
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created_at=$(date -Iseconds)
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guest_ip=$GUEST_IP
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tap=$TAP_DEV
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api_sock=$API_SOCK
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log=$LOG_FILE
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EOF
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log "configuring machine"
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/machine-config \
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-H "Content-Type: application/json" \
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-d '{
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"vcpu_count": 2,
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"mem_size_mib": 1024,
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"smt": false
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}' >/dev/null
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KCMD="console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rw ip=${GUEST_IP}::${BR_IP}:255.255.255.0:${VM_NAME}:eth0:off:${DNS_SERVER} hostname=${VM_NAME}"
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/boot-source \
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-H "Content-Type: application/json" \
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-d "{
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\"kernel_image_path\": \"$KERNEL\",
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\"boot_args\": \"$KCMD\"
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}" >/dev/null
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/drives/rootfs \
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-H "Content-Type: application/json" \
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-d "{
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\"drive_id\": \"rootfs\",
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\"path_on_host\": \"$OUT_ROOTFS\",
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\"is_root_device\": true,
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\"is_read_only\": false
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}" >/dev/null
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/network-interfaces/eth0 \
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-H "Content-Type: application/json" \
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-d "{
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\"iface_id\": \"eth0\",
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\"host_dev_name\": \"$TAP_DEV\"
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}" >/dev/null
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/actions \
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-H "Content-Type: application/json" \
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-d '{ "action_type": "InstanceStart" }' >/dev/null
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log "enabling NAT for customization"
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sudo -E ./nat.sh up "$VM_TAG" >/dev/null
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log "waiting for SSH"
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for _ in $(seq 1 60); do
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if ssh -i "$SSH_KEY" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
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"root@${GUEST_IP}" "true" >/dev/null 2>&1; then
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break
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fi
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sleep 1
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done
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log "configuring guest"
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ssh -i "$SSH_KEY" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
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"root@${GUEST_IP}" bash -lc "set -e
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printf 'nameserver %s\n' \"$DNS_SERVER\" > /etc/resolv.conf
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echo \"$VM_NAME\" > /etc/hostname
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printf '127.0.0.1 localhost\n127.0.1.1 %s\n' \"$VM_NAME\" > /etc/hosts
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apt-get update
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DEBIAN_FRONTEND=noninteractive apt-get -y upgrade
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DEBIAN_FRONTEND=noninteractive apt-get -y install git less tree ca-certificates curl
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git config --system init.defaultBranch main
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"
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log "customization complete; shutting down"
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sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/actions \
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-H "Content-Type: application/json" \
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-d '{ "action_type": "SendCtrlAltDel" }' >/dev/null || true
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sleep 2
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log "done"
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