Add vm control scripts

kill.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+log() {
+  printf '[kill] %s\n' "$*"
+}
+
+usage() {
+  cat <<'EOF'
+Usage: ./kill.sh <id-or-name-prefix> [--signal SIGTERM|SIGKILL|...]
+
+Sends a signal to the Firecracker process.
+EOF
+}
+
+get_prop() {
+  local info="$1"
+  local key="$2"
+  awk -F= -v k="$key" '$1==k {print $2}' "$info"
+}
+
+find_vm_info() {
+  local query="$1"
+  local info match_count=0 match=""
+
+  for info in state/vm-*/info; do
+    [[ -f "$info" ]] || continue
+    local id name
+    id="$(get_prop "$info" "id")"
+    name="$(get_prop "$info" "name")"
+    if [[ "$id" == "$query"* || "$name" == "$query"* ]]; then
+      match="$info"
+      match_count=$((match_count + 1))
+    fi
+  done
+
+  if (( match_count == 0 )); then
+    log "no VM found for prefix: $query"
+    exit 1
+  fi
+  if (( match_count > 1 )); then
+    log "multiple VMs found for prefix: $query"
+    exit 1
+  fi
+
+  printf '%s' "$match"
+}
+
+SIGNAL="TERM"
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --signal)
+      SIGNAL="${2:-}"
+      shift 2
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      if [[ -z "${QUERY:-}" ]]; then
+        QUERY="$1"
+        shift
+        continue
+      fi
+      log "unknown option: $1"
+      usage
+      exit 1
+      ;;
+  esac
+done
+
+if [[ -z "$QUERY" || "$QUERY" == "-h" || "$QUERY" == "--help" ]]; then
+  usage
+  exit 1
+fi
+
+INFO_FILE="$(find_vm_info "$QUERY")"
+PID="$(get_prop "$INFO_FILE" "pid")"
+if [[ -z "$PID" ]]; then
+  log "pid not found in $INFO_FILE"
+  exit 1
+fi
+
+log "sending SIG$SIGNAL to pid $PID"
+sudo kill "-$SIGNAL" "$PID"
+log "signal sent"