Basic functionality

Dockerfile

@@ -0,0 +1,18 @@
+FROM golang:1 as builder
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . ./
+RUN CGO_ENABLED=0 GOOS=linux go build -o /dsb
+
+FROM builder as tester
+
+RUN go test -v
+
+FROM debian:12-slim
+
+COPY --from=builder /dsb /dsb
+ENTRYPOINT [ "/dsb" ]
+CMD [ "schedule" ]
+

Taskfile.yml

@@ -0,0 +1,9 @@
+version: '3'
+
+tasks:
+  build:
+    cmds:
+      - docker buildx build -t {{.NAME}}:{{.TAG}} .
+    vars:
+      NAME: docker-s3-backup
+      TAG: latest

cmd/backup.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"code.jhot.me/jhot/docker-s3-backup/internal"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(backupCmd)
+}
+
+var backupCmd = &cobra.Command{
+	Use:   "backup",
+	Short: "Run the backup once",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		err := internal.Backup(cmd.Context())
+		return err
+	},
+}

cmd/root.go

@@ -0,0 +1,21 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "dsb",
+	Short: "Docker S3 Backup - backup S3 buckets with Docker",
+}
+
+func Execute(ctx context.Context) {
+	if err := rootCmd.ExecuteContext(ctx); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}

cmd/schedule.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"code.jhot.me/jhot/docker-s3-backup/internal"
+
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(scheduleCmd)
+}
+
+var scheduleCmd = &cobra.Command{
+	Use:   "schedule",
+	Short: "Run the backup on a cron schedule",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		err := internal.StartSchedule(cmd.Context())
+		return err
+	},
+}

go.mod

@@ -1,3 +1,32 @@
 module code.jhot.me/jhot/docker-s3-backup
 
 go 1.20
+
+require (
+	github.com/go-co-op/gocron v1.33.1
+	github.com/minio/minio-go/v7 v7.0.63
+	github.com/spf13/cobra v1.7.0
+)
+
+require (
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.3.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.16.7 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.5 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
+	github.com/minio/sha256-simd v1.0.1 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/rs/xid v1.5.0 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	golang.org/x/crypto v0.12.0 // indirect
+	golang.org/x/net v0.14.0 // indirect
+	golang.org/x/sys v0.11.0 // indirect
+	golang.org/x/text v0.12.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+)

go.sum

@@ -0,0 +1,84 @@
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internal/backup.go

@@ -0,0 +1,46 @@
+package internal
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+)
+
+var (
+	MinioClient *minio.Client
+)
+
+func Backup(ctx context.Context) error {
+	var err error
+	var getErrors = []string{}
+	bucketNames := GetEnvWithDefault("BUCKET_NAMES", "")
+	backupRoot := GetEnvWithDefault("BACKUP_ROOT", "/backup")
+
+	MinioClient, err = minio.New(GetEnvWithDefault("S3_HOST", "localhost"), &minio.Options{
+		Creds:  credentials.NewStaticV4(GetEnvWithDefault("S3_ACCESS_KEY_ID", ""), GetEnvWithDefault("S3_ACCESS_KEY_SECRET", ""), ""),
+		Secure: GetEnvWithDefault("S3_USE_SSL", "") == "true",
+		Region: GetEnvWithDefault("S3_REGION", "us-east-1"),
+	})
+	if err != nil {
+		return err
+	}
+
+	for _, bucket := range strings.Split(bucketNames, ",") {
+		bucket = strings.TrimSpace(bucket)
+		for object := range MinioClient.ListObjects(ctx, bucket, minio.ListObjectsOptions{Recursive: true}) {
+			getError := MinioClient.FGetObject(ctx, bucket, object.Key, fmt.Sprintf("%s/%s/%s", backupRoot, bucket, object.Key), minio.GetObjectOptions{})
+			if getError != nil {
+				getErrors = append(getErrors, getError.Error())
+			}
+		}
+	}
+
+	if len(getErrors) > 0 {
+		err = fmt.Errorf("%d errors retrieving objects: %s", len(getErrors), strings.Join(getErrors, ", "))
+	}
+
+	return err
+}

internal/env.go

@@ -0,0 +1,13 @@
+package internal
+
+import (
+	"os"
+)
+
+func GetEnvWithDefault(name string, defaultValue string) string {
+	value := os.Getenv(name)
+	if value != "" {
+		return value
+	}
+	return defaultValue
+}

internal/schedule.go

@@ -0,0 +1,29 @@
+package internal
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-co-op/gocron"
+)
+
+var (
+	scheduler *gocron.Scheduler
+)
+
+func StartSchedule(ctx context.Context) error {
+	cronExpression := GetEnvWithDefault("SCHEDULE_CRON", "0 0 * * *")
+	scheduler = gocron.NewScheduler(time.Local)
+	_, err := scheduler.Cron(cronExpression).Do(Backup, ctx)
+	if err != nil {
+		return err
+	}
+	scheduler.StartBlocking()
+	return nil
+}
+
+func StopSchedule() {
+	if scheduler != nil {
+		scheduler.StopBlockingChan()
+	}
+}

main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"code.jhot.me/jhot/docker-s3-backup/cmd"
+	"code.jhot.me/jhot/docker-s3-backup/internal"
+)
+
+var (
+	ctx    context.Context
+	cancel context.CancelFunc
+)
+
+func main() {
+	ctx, cancel = context.WithCancel(context.Background())
+
+	go func() {
+		sigch := make(chan os.Signal, 1)
+		signal.Notify(sigch, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
+		<-sigch
+		internal.StopSchedule()
+		cancel()
+	}()
+
+	cmd.Execute(ctx)
+}