85 lines
1.5 KiB
Bash
Executable file
85 lines
1.5 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -euo pipefail
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log() {
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printf '[logs] %s\n' "$*"
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}
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usage() {
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cat <<'EOF'
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Usage: ./logs.sh <id-or-name-prefix> [--follow]
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Prints the Firecracker log for a VM. Use --follow to tail -f.
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EOF
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}
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find_vm_json() {
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local query="$1"
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local vm_json match_count=0 match=""
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for vm_json in state/vms/*/vm.json; do
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[[ -f "$vm_json" ]] || continue
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local id name
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id="$(jq -r '.meta.id // empty' "$vm_json")"
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name="$(jq -r '.meta.name // empty' "$vm_json")"
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if [[ "$id" == "$query"* || "$name" == "$query"* ]]; then
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match="$vm_json"
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match_count=$((match_count + 1))
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fi
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done
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if (( match_count == 0 )); then
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log "no VM found for prefix: $query"
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exit 1
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fi
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if (( match_count > 1 )); then
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log "multiple VMs found for prefix: $query"
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exit 1
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fi
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printf '%s' "$match"
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}
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QUERY="${1:-}"
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FOLLOW=0
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--follow|-f)
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FOLLOW=1
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shift
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;;
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-h|--help)
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usage
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exit 0
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;;
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*)
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if [[ -z "$QUERY" ]]; then
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QUERY="$1"
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shift
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else
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log "unknown option: $1"
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usage
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exit 1
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fi
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;;
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esac
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done
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if [[ -z "$QUERY" ]]; then
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usage
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exit 1
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fi
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VM_JSON="$(find_vm_json "$QUERY")"
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LOG_FILE="$(jq -r '.meta.log // empty' "$VM_JSON")"
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if [[ -z "$LOG_FILE" || ! -f "$LOG_FILE" ]]; then
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log "log file not found: $LOG_FILE"
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exit 1
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fi
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if (( FOLLOW == 1 )); then
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tail -f "$LOG_FILE"
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else
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cat "$LOG_FILE"
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fi
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