91 lines
1.5 KiB
Bash
Executable file
91 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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get_prop() {
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local info="$1"
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local key="$2"
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awk -F= -v k="$key" '$1==k {print $2}' "$info"
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}
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find_vm_info() {
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local query="$1"
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local info match_count=0 match=""
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for info in state/vms/*/info; do
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[[ -f "$info" ]] || continue
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local id name
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id="$(get_prop "$info" "id")"
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name="$(get_prop "$info" "name")"
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if [[ "$id" == "$query"* || "$name" == "$query"* ]]; then
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match="$info"
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match_count=$((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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INFO_FILE="$(find_vm_info "$QUERY")"
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LOG_FILE="$(get_prop "$INFO_FILE" "log")"
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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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