Earthly auto-skip DB dumper

Dockerfile

FROM golang:1.24-bookworm

WORKDIR /app

COPY dumper.go .

RUN go mod init boltdbdumper && \
    go get go.etcd.io/bbolt@latest && \
    go mod tidy && \
    go build -o dumper

CMD ["./dumper"]

dumper.bash

#!/bin/bash

set -euxo pipefail

dbfile=$(readlink --canonicalize "$1")

docker build --tag earthly-auto-skip-db-dumper .
docker run \
  --rm \
  --interactive --tty \
  --env "DB_FILE=target.db" \
  --volume "$dbfile:/app/target.db" \
  earthly-auto-skip-db-dumper

dumper.go

package main

import (
	"encoding/hex"
	"fmt"
	"log"
	"os"

	bolt "go.etcd.io/bbolt"
)

func main() {
	path := os.Getenv("DB_FILE")
	if path == "" {
		log.Fatal("DB_FILE environment variable is not set")
	}

	db, err := bolt.Open(path, 0600, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	err = db.View(func(tx *bolt.Tx) error {
		return tx.ForEach(func(bname []byte, b *bolt.Bucket) error {
			fmt.Printf("Bucket: %s\n", bname)
			return b.ForEach(func(k, v []byte) error {
				fmt.Printf("  %s => %s\n", hex.EncodeToString(k), v)
				return nil
			})
		})
	})
	if err != nil {
		log.Fatal(err)
	}
}