Document script behavior on label collision

* Update index.md

* Rename set-up-drobox.md to set-up-dropbox.md

cmd/backup/main.go

@@ -44,7 +44,7 @@ func main() {
 	}()
 
 	s.must(s.withLabeledCommands(lifecyclePhaseArchive, func() error {
-		restartContainers, err := s.stopContainers()
+		restartContainers, err := s.stopContainersAndServices()
 		// The mechanism for restarting containers is not using hooks as it
 		// should happen as soon as possible (i.e. before uploading backups or
 		// similar).

cmd/backup/script.go

@@ -27,9 +27,10 @@ import (
 	"github.com/offen/docker-volume-backup/internal/storage/ssh"
 	"github.com/offen/docker-volume-backup/internal/storage/webdav"
 
-	"github.com/ProtonMail/go-crypto/openpgp"
+	openpgp "github.com/ProtonMail/go-crypto/openpgp/v2"
 	"github.com/containrrr/shoutrrr"
 	"github.com/containrrr/shoutrrr/pkg/router"
+	"github.com/docker/cli/cli/command/service/progress"
 	"github.com/docker/docker/api/types"
 	ctr "github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/filters"
@@ -318,44 +319,110 @@ func newScript() (*script, error) {
 	return s, nil
 }
 
-// stopContainers stops all Docker containers that are marked as to being
+type noopWriteCloser struct {
+	io.Writer
+}
+
+func (noopWriteCloser) Close() error {
+	return nil
+}
+
+type handledSwarmService struct {
+	serviceID           string
+	initialReplicaCount uint64
+}
+
+// stopContainersAndServices stops all Docker containers that are marked as to being
 // stopped during the backup and returns a function that can be called to
 // restart everything that has been stopped.
-func (s *script) stopContainers() (func() error, error) {
+func (s *script) stopContainersAndServices() (func() error, error) {
 	if s.cli == nil {
 		return noop, nil
 	}
 
-	allContainers, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{})
+	dockerInfo, err := s.cli.Info(context.Background())
 	if err != nil {
-		return noop, fmt.Errorf("stopContainers: error querying for containers: %w", err)
+		return noop, fmt.Errorf("(*script).stopContainersAndServices: error getting docker info: %w", err)
 	}
+	isDockerSwarm := dockerInfo.Swarm.LocalNodeState != "inactive"
+	discardWriter := &noopWriteCloser{io.Discard}
 
-	containerLabel := fmt.Sprintf(
+	filterMatchLabel := fmt.Sprintf(
 		"docker-volume-backup.stop-during-backup=%s",
 		s.c.BackupStopContainerLabel,
 	)
+
+	allContainers, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{})
+	if err != nil {
+		return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for containers: %w", err)
+	}
 	containersToStop, err := s.cli.ContainerList(context.Background(), types.ContainerListOptions{
 		Filters: filters.NewArgs(filters.KeyValuePair{
 			Key:   "label",
-			Value: containerLabel,
+			Value: filterMatchLabel,
 		}),
 	})
-
 	if err != nil {
-		return noop, fmt.Errorf("stopContainers: error querying for containers to stop: %w", err)
+		return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for containers to stop: %w", err)
 	}
 
-	if len(containersToStop) == 0 {
+	var allServices []swarm.Service
+	var servicesToScaleDown []handledSwarmService
+	if isDockerSwarm {
+		allServices, err = s.cli.ServiceList(context.Background(), types.ServiceListOptions{})
+		if err != nil {
+			return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for services: %w", err)
+		}
+		matchingServices, err := s.cli.ServiceList(context.Background(), types.ServiceListOptions{
+			Filters: filters.NewArgs(filters.KeyValuePair{
+				Key:   "label",
+				Value: filterMatchLabel,
+			}),
+			Status: true,
+		})
+		for _, s := range matchingServices {
+			servicesToScaleDown = append(servicesToScaleDown, handledSwarmService{
+				serviceID:           s.ID,
+				initialReplicaCount: *s.Spec.Mode.Replicated.Replicas,
+			})
+		}
+		if err != nil {
+			return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for services to scale down: %w", err)
+		}
+	}
+
+	if len(containersToStop) == 0 && len(servicesToScaleDown) == 0 {
 		return noop, nil
 	}
 
+	if isDockerSwarm {
+		for _, container := range containersToStop {
+			if swarmServiceID, ok := container.Labels["com.docker.swarm.service.id"]; ok {
+				parentService, _, err := s.cli.ServiceInspectWithRaw(context.Background(), swarmServiceID, types.ServiceInspectOptions{})
+				if err != nil {
+					return noop, fmt.Errorf("(*script).stopContainersAndServices: error querying for parent service with ID %s: %w", swarmServiceID, err)
+				}
+				for label := range parentService.Spec.Labels {
+					if label == "docker-volume-backup.stop-during-backup" {
+						return noop, fmt.Errorf(
+							"(*script).stopContainersAndServices: container %s is labeled to stop but has parent service %s which is also labeled, cannot continue",
+							container.Names[0],
+							parentService.Spec.Name,
+						)
+					}
+				}
+			}
+		}
+	}
+
 	s.logger.Info(
 		fmt.Sprintf(
-			"Stopping %d container(s) labeled `%s` out of %d running container(s).",
+			"Stopping %d out of %d running container(s) and scaling down %d out of %d active service(s) as they were labeled %s.",
 			len(containersToStop),
-			containerLabel,
 			len(allContainers),
+			len(servicesToScaleDown),
+			len(allServices),
+			filterMatchLabel,
 		),
 	)
 
@@ -369,28 +436,82 @@ func (s *script) stopContainers() (func() error, error) {
 		}
 	}
 
-	var stopError error
-	if len(stopErrors) != 0 {
-		stopError = fmt.Errorf(
-			"stopContainers: %d error(s) stopping containers: %w",
-			len(stopErrors),
-			errors.Join(stopErrors...),
-		)
+	var scaledDownServices []swarm.Service
+	var scaleDownErrors []error
+	if isDockerSwarm {
+		for _, svc := range servicesToScaleDown {
+			service, _, err := s.cli.ServiceInspectWithRaw(context.Background(), svc.serviceID, types.ServiceInspectOptions{})
+			if err != nil {
+				scaleDownErrors = append(
+					scaleDownErrors,
+					fmt.Errorf("(*script).stopContainersAndServices: error inspecting service %s: %w", svc.serviceID, err),
+				)
+				continue
+			}
+			var zero uint64 = 0
+			serviceMode := &service.Spec.Mode
+			switch {
+			case serviceMode.Replicated != nil:
+				serviceMode.Replicated.Replicas = &zero
+			default:
+				scaleDownErrors = append(
+					scaleDownErrors,
+					fmt.Errorf("(*script).stopContainersAndServices: labeled service %s has to be in replicated mode", service.Spec.Name),
+				)
+				continue
+			}
+
+			response, err := s.cli.ServiceUpdate(context.Background(), service.ID, service.Version, service.Spec, types.ServiceUpdateOptions{})
+			if err != nil {
+				scaleDownErrors = append(scaleDownErrors, err)
+				continue
+			}
+
+			for _, warning := range response.Warnings {
+				s.logger.Warn(
+					fmt.Sprintf("The Docker API returned a warning when scaling down service %s: %s", service.Spec.Name, warning),
+				)
+			}
+
+			if err := progress.ServiceProgress(context.Background(), s.cli, service.ID, discardWriter); err != nil {
+				scaleDownErrors = append(scaleDownErrors, err)
+			} else {
+				scaledDownServices = append(scaledDownServices, service)
+			}
+		}
 	}
 
 	s.stats.Containers = ContainersStats{
-		All:     uint(len(allContainers)),
-		ToStop:  uint(len(containersToStop)),
-		Stopped: uint(len(stoppedContainers)),
+		All:        uint(len(allContainers)),
+		ToStop:     uint(len(containersToStop)),
+		Stopped:    uint(len(stoppedContainers)),
+		StopErrors: uint(len(stopErrors)),
+	}
+
+	s.stats.Services = ServicesStats{
+		All:             uint(len(allServices)),
+		ToScaleDown:     uint(len(servicesToScaleDown)),
+		ScaledDown:      uint(len(scaledDownServices)),
+		ScaleDownErrors: uint(len(scaleDownErrors)),
+	}
+
+	var initialErr error
+	allErrors := append(stopErrors, scaleDownErrors...)
+	if len(allErrors) != 0 {
+		initialErr = fmt.Errorf(
+			"(*script).stopContainersAndServices: %d error(s) stopping containers: %w",
+			len(allErrors),
+			errors.Join(allErrors...),
+		)
 	}
 
 	return func() error {
-		servicesRequiringUpdate := map[string]struct{}{}
+		servicesRequiringForceUpdate := map[string]struct{}{}
 
 		var restartErrors []error
 		for _, container := range stoppedContainers {
 			if swarmServiceName, ok := container.Labels["com.docker.swarm.service.name"]; ok {
-				servicesRequiringUpdate[swarmServiceName] = struct{}{}
+				servicesRequiringForceUpdate[swarmServiceName] = struct{}{}
 				continue
 			}
 			if err := s.cli.ContainerStart(context.Background(), container.ID, types.ContainerStartOptions{}); err != nil {
@@ -398,9 +519,9 @@ func (s *script) stopContainers() (func() error, error) {
 			}
 		}
 
-		if len(servicesRequiringUpdate) != 0 {
+		if len(servicesRequiringForceUpdate) != 0 {
 			services, _ := s.cli.ServiceList(context.Background(), types.ServiceListOptions{})
-			for serviceName := range servicesRequiringUpdate {
+			for serviceName := range servicesRequiringForceUpdate {
 				var serviceMatch swarm.Service
 				for _, service := range services {
 					if service.Spec.Name == serviceName {
@@ -409,7 +530,11 @@ func (s *script) stopContainers() (func() error, error) {
 					}
 				}
 				if serviceMatch.ID == "" {
-					return fmt.Errorf("stopContainers: couldn't find service with name %s", serviceName)
+					restartErrors = append(
+						restartErrors,
+						fmt.Errorf("(*script).stopContainersAndServices: couldn't find service with name %s", serviceName),
+					)
+					continue
 				}
 				serviceMatch.Spec.TaskTemplate.ForceUpdate += 1
 				if _, err := s.cli.ServiceUpdate(
@@ -421,21 +546,54 @@ func (s *script) stopContainers() (func() error, error) {
 			}
 		}
 
-		if len(restartErrors) != 0 {
+		var scaleUpErrors []error
+		if isDockerSwarm {
+			for _, svc := range servicesToScaleDown {
+				service, _, err := s.cli.ServiceInspectWithRaw(context.Background(), svc.serviceID, types.ServiceInspectOptions{})
+				if err != nil {
+					scaleUpErrors = append(scaleUpErrors, err)
+					continue
+				}
+
+				service.Spec.Mode.Replicated.Replicas = &svc.initialReplicaCount
+				response, err := s.cli.ServiceUpdate(
+					context.Background(),
+					service.ID,
+					service.Version, service.Spec,
+					types.ServiceUpdateOptions{},
+				)
+				if err != nil {
+					scaleUpErrors = append(scaleUpErrors, err)
+					continue
+				}
+				for _, warning := range response.Warnings {
+					s.logger.Warn(
+						fmt.Sprintf("The Docker API returned a warning when scaling up service %s: %s", service.Spec.Name, warning),
+					)
+				}
+				if err := progress.ServiceProgress(context.Background(), s.cli, service.ID, discardWriter); err != nil {
+					scaleUpErrors = append(scaleUpErrors, err)
+				}
+			}
+		}
+
+		allErrors := append(restartErrors, scaleUpErrors...)
+		if len(allErrors) != 0 {
 			return fmt.Errorf(
 				"stopContainers: %d error(s) restarting containers and services: %w",
-				len(restartErrors),
-				errors.Join(restartErrors...),
+				len(allErrors),
+				errors.Join(allErrors...),
 			)
 		}
 		s.logger.Info(
 			fmt.Sprintf(
-				"Restarted %d container(s) and the matching service(s).",
+				"Restarted %d container(s) and %d service(s).",
 				len(stoppedContainers),
+				len(scaledDownServices),
 			),
 		)
 		return nil
-	}, stopError
+	}, initialErr
 }
 
 // createArchive creates a tar archive of the configured backup location and
@@ -540,7 +698,6 @@ func (s *script) encryptArchive() error {
 
 	_, name := path.Split(s.file)
 	dst, err := openpgp.SymmetricallyEncrypt(outFile, []byte(s.c.GpgPassphrase), &openpgp.FileHints{
-		IsBinary: true,
 		FileName: name,
 	}, nil)
 	if err != nil {

cmd/backup/stats.go

@@ -17,6 +17,15 @@ type ContainersStats struct {
 	StopErrors uint
 }
 
+// ServicesStats contains info about Swarm services that have been
+// operated upon
+type ServicesStats struct {
+	All             uint
+	ToScaleDown     uint
+	ScaledDown      uint
+	ScaleDownErrors uint
+}
+
 // BackupFileStats stats about the created backup file
 type BackupFileStats struct {
 	Name     string
@@ -40,6 +49,7 @@ type Stats struct {
 	LockedTime time.Duration
 	LogOutput  *bytes.Buffer
 	Containers ContainersStats
+	Services   ServicesStats
 	BackupFile BackupFileStats
 	Storages   map[string]StorageStats
 }

docs/how-tos/set-up-notifications.md

@@ -89,6 +89,11 @@ Here is a list of all data passed to the template:
     * `ToStop`: number of containers matched by the stop rule
     * `Stopped`: number of containers successfully stopped
     * `StopErrors`: number of containers that were unable to be stopped (equal to `ToStop - Stopped`)
+  * `Services`: object containing stats about the docker services (only populated when Docker is running in Swarm mode)
+    * `All`: total number of services
+    * `ToScaleDown`: number of containers matched by the scale down rule
+    * `ScaledDwon`: number of containers successfully scaled down
+    * `ScaleDownErrors`: number of containers that were unable to be stopped (equal to `ToScaleDown - ScaledDowm`)
   * `BackupFile`: object containing information about the backup file
     * `Name`: name of the backup file (e.g. `backup-2022-02-11T01-00-00.tar.gz`)
     * `FullPath`: full path of the backup file (e.g. `/archive/backup-2022-02-11T01-00-00.tar.gz`)

docs/how-tos/stop-containers-during-backup.md

@@ -7,6 +7,9 @@ nav_order: 1
 
 # Stop containers during backup
 
+{: .note }
+In case you are running Docker in Swarm mode, [dedicated documentation](./use-with-docker-swarm.html) on service and container restart applies.
+
 In many cases, it will be desirable to stop the services that are consuming the volume you want to backup in order to ensure data integrity.
 This image can automatically stop and restart containers and services.
 By default, any container that is labeled `docker-volume-backup.stop-during-backup=true` will be stopped before the backup is being taken and restarted once it has finished.

docs/how-tos/use-with-docker-swarm.md

@@ -7,12 +7,66 @@ nav_order: 13
 
 # Use with Docker Swarm
 
-By default, Docker Swarm will restart stopped containers automatically, even when manually stopped.
-If you plan to have your containers / services stopped during backup, this means you need to apply the `on-failure` restart policy to your service's definitions.
-A restart policy of `always` is not compatible with this tool.
+{: .note }
+The mechanisms described in this page __do only apply when Docker is running in [Swarm mode][swarm]__.
+
+[swarm]: https://docs.docker.com/engine/swarm/
+
+## Stopping containers during backup
+
+Stopping and restarting containers during backup creation when running Docker in Swarm mode is supported in two ways.
+
+{: .important }
+Make sure you label your services and containers using only one of the describe approaches.
+In case the script encounters a container that is labeled and has a parent service that is also labeled, it will exit early.
+
+### Scaling services down to zero before scaling back up
+
+When labeling a service in the `deploy` section, the following strategy for stopping and restarting will be used:
+
+- The service is scaled down to zero replicas
+- The backup is created
+- The service is scaled back up to the previous number of replicas
+
+{: .note }
+This approach will only work for services that are deployed in __replicated mode__.
+
+Such a service definition could look like:
+
+```yml
+services:
+  app:
+    image: myorg/myimage:latest
+    deploy:
+      labels:
+        - docker-volume-backup.stop-during-backup=true
+      replicas: 2
+```
+
+### Stopping the containers
+
+This approach bypasses the services and stops containers directly, creates the backup and restarts the containers again.
+As Docker Swarm would usually try to instantly restart containers that are manually stopped, this approach only works when using the `on-failure` restart policy.
+A restart policy of `always` is not compatible with this approach.
+
+Such a service definition could look like:
+
+```yml
+services:
+  app:
+    image: myapp/myimage:latest
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    deploy:
+      replicas: 2
+      restart_policy:
+        condition: on-failure
+```
 
 ---
 
+## Memory limit considerations
+
 When running in Swarm mode, it's also advised to set a hard memory limit on your service (~25MB should be enough in most cases, but if you backup large files above half a gigabyte or similar, you might have to raise this in case the backup exits with `Killed`):
 
 ```yml

docs/recipes/index.md

@@ -177,7 +177,7 @@ volumes:
 
 ## Backing up to Dropbox
 
-See [Dropbox Setup](#setup-dropbox-storage-backend) on how to get the appropriate environment values.
+See [Dropbox Setup](../how-tos/set-up-dropbox.md) on how to get the appropriate environment values.
 
 ```yml
 version: '3'

go.mod

@@ -3,10 +3,11 @@ module github.com/offen/docker-volume-backup
 go 1.21
 
 require (
-	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.4.0
+	github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.1
 	github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.2.1
 	github.com/containrrr/shoutrrr v0.7.1
 	github.com/cosiner/argv v0.1.0
+	github.com/docker/cli v24.0.1+incompatible
 	github.com/docker/docker v24.0.7+incompatible
 	github.com/gofrs/flock v0.8.1
 	github.com/klauspost/compress v1.17.4
@@ -16,15 +17,17 @@ require (
 	github.com/otiai10/copy v1.14.0
 	github.com/pkg/sftp v1.13.6
 	github.com/studio-b12/gowebdav v0.9.0
-	golang.org/x/crypto v0.17.0
-	golang.org/x/oauth2 v0.15.0
-	golang.org/x/sync v0.5.0
+	golang.org/x/crypto v0.18.0
+	golang.org/x/oauth2 v0.16.0
+	golang.org/x/sync v0.6.0
 )
 
 require (
-	github.com/cloudflare/circl v1.3.3 // indirect
-	github.com/golang-jwt/jwt/v5 v5.0.0 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
+	github.com/cloudflare/circl v1.3.7 // indirect
+	github.com/golang-jwt/jwt/v5 v5.2.0 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
+	golang.org/x/time v0.0.0-20220609170525-579cf78fd858 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
 )
@@ -32,9 +35,9 @@ require (
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.9.1 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.5.1 // indirect
-	github.com/AzureAD/microsoft-authentication-library-for-go v1.1.1 // indirect
+	github.com/AzureAD/microsoft-authentication-library-for-go v1.2.1 // indirect
 	github.com/Microsoft/go-winio v0.5.2 // indirect
-	github.com/ProtonMail/go-crypto v0.0.0-20230717121422-5aa5874ade95
+	github.com/ProtonMail/go-crypto v1.1.0-alpha.0
 	github.com/docker/distribution v2.8.2+incompatible // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.4.0 // indirect
@@ -59,12 +62,12 @@ require (
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.0.3-0.20211202183452-c5a74bcca799 // indirect
-	github.com/pkg/browser v0.0.0-20210911075715-681adbf594b8 // indirect
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rs/xid v1.5.0 // indirect
 	github.com/sirupsen/logrus v1.9.3 // indirect
-	golang.org/x/net v0.19.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/net v0.20.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect

go.sum

@@ -183,8 +183,8 @@ cloud.google.com/go/workflows v1.7.0/go.mod h1:JhSrZuVZWuiDfKEFxU0/F1PQjmpnpcoIS
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.9.1 h1:lGlwhPtrX6EVml1hO0ivjkUxsSyl4dsiw9qcA1k/3IQ=
 github.com/Azure/azure-sdk-for-go/sdk/azcore v1.9.1/go.mod h1:RKUqNu35KJYcVG/fqTRqmuXJZYNhYkBrnC/hX7yGbTA=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.4.0 h1:BMAjVKJM0U/CYF27gA0ZMmXGkOcvfFtD0oHVZ1TIPRI=
-github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.4.0/go.mod h1:1fXstnBMas5kzG+S3q8UoJcmyU6nUeunJcMDHcRYHhs=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.1 h1:sO0/P7g68FrryJzljemN+6GTssUXdANk6aJ7T1ZxnsQ=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.5.1/go.mod h1:h8hyGFDsU5HMivxiS2iYFZsgDbU9OnnJ163x5UGVKYo=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.5.1 h1:6oNBlSdi1QqM1PNW7FPA6xOGA5UNsXnkaYZz9vdPGhA=
 github.com/Azure/azure-sdk-for-go/sdk/internal v1.5.1/go.mod h1:s4kgfzA0covAXNicZHDMN58jExvcng2mC/DepXiF1EI=
 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/storage/armstorage v1.5.0 h1:AifHbc4mg0x9zW52WOpKbsHaDKuRhlI7TVl47thgQ70=
@@ -193,16 +193,16 @@ github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.2.1 h1:AMf7YbZOZIW5b66cX
 github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.2.1/go.mod h1:uwfk06ZBcvL/g4VHNjurPfVln9NMbsk2XIZxJ+hu81k=
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@@ -220,7 +220,6 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
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@@ -230,8 +229,8 @@ github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMn
 github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
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@@ -254,6 +253,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
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+github.com/docker/cli v24.0.1+incompatible h1:uVl5Xv/39kZJpDo9VaktTOYBc702sdYYF33FqwUG/dM=
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@@ -305,8 +306,8 @@ github.com/gofrs/flock v0.8.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14j
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@@ -561,8 +562,8 @@ github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FI
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@@ -674,12 +675,8 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
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@@ -718,7 +715,6 @@ golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -777,11 +773,8 @@ golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug
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@@ -806,8 +799,8 @@ golang.org/x/oauth2 v0.0.0-20220622183110-fd043fe589d2/go.mod h1:jaDAt6Dkxork7Lm
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@@ -823,8 +816,8 @@ golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f/go.mod h1:RxMgew5VJxzue5/jJ
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 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -890,7 +883,6 @@ golang.org/x/sys v0.0.0-20210514084401-e8d321eab015/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210603125802-9665404d3644/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210616045830-e2b7044e8c71/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -920,20 +912,14 @@ golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.3.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
-golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
+golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
-golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc=
-golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
-golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
-golang.org/x/term v0.15.0 h1:y/Oo/a/q3IXu26lQgl04j/gjuBDOBlx7X6Om1j2CPW4=
-golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
+golang.org/x/term v0.16.0 h1:m+B6fahuftsE9qjo0VWp2FW0mB3MTJvR0BaMQrq0pmE=
+golang.org/x/term v0.16.0/go.mod h1:yn7UURbUtPyrVJPGPq404EukNFxcm/foM+bV/bfcDsY=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -944,8 +930,6 @@ golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
-golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -1013,7 +997,6 @@ golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=
-golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -1260,6 +1243,7 @@ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 gotest.tools/v3 v3.0.2/go.mod h1:3SzNCllyD9/Y+b5r9JIKQ474KzkZyqLqEfYqMsX94Bk=
 gotest.tools/v3 v3.0.3 h1:4AuOwCGf4lLR9u3YOe2awrHygurzhO/HeQ6laiA6Sx0=

test/collision/docker-compose.yml

@@ -0,0 +1,28 @@
+# Copyright 2020-2021 - Offen Authors <hioffen@posteo.de>
+# SPDX-License-Identifier: Unlicense
+
+version: '3.8'
+
+services:
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    environment:
+      BACKUP_FILENAME: test.tar.gz
+    volumes:
+      - offen_data:/backup/offen_data:ro
+      - ${LOCAL_DIR:-./local}:/archive
+      - /var/run/docker.sock:/var/run/docker.sock
+
+  offen:
+    image: offen/offen:latest
+    labels:
+      - docker-volume-backup.stop-during-backup=true
+    deploy:
+      labels:
+        - docker-volume-backup.stop-during-backup=true
+      replicas: 2
+    volumes:
+      - offen_data:/var/opt/offen
+
+volumes:
+  offen_data:

test/collision/run.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+. ../util.sh
+current_test=$(basename $(pwd))
+
+export LOCAL_DIR=$(mktemp -d)
+
+docker swarm init
+
+docker stack deploy --compose-file=docker-compose.yml test_stack
+
+while [ -z $(docker ps -q -f name=backup) ]; do
+  info "Backup container not ready yet. Retrying."
+  sleep 1
+done
+
+sleep 20
+
+set +e
+docker exec $(docker ps -q -f name=backup) backup
+if [ $? = "0" ]; then
+  fail "Expected script to exit with error code."
+fi
+
+if [ -f "${LOCAL_DIR}/test.tar.gz" ]; then
+  fail "Found backup file that should not have been created."
+fi
+
+expect_running_containers "3"
+
+pass "Script did not perform backup as there was a label collision."

test/services/docker-compose.yml

@@ -0,0 +1,57 @@
+# Copyright 2020-2021 - Offen Authors <hioffen@posteo.de>
+# SPDX-License-Identifier: Unlicense
+
+version: '3.8'
+
+services:
+  minio:
+    image: minio/minio:RELEASE.2020-08-04T23-10-51Z
+    environment:
+      MINIO_ROOT_USER: test
+      MINIO_ROOT_PASSWORD: test
+      MINIO_ACCESS_KEY: test
+      MINIO_SECRET_KEY: GMusLtUmILge2by+z890kQ
+    entrypoint: /bin/ash -c 'mkdir -p /data/backup && minio server /data'
+    volumes:
+      - backup_data:/data
+
+  backup:
+    image: offen/docker-volume-backup:${TEST_VERSION:-canary}
+    depends_on:
+      - minio
+    environment:
+      AWS_ACCESS_KEY_ID: test
+      AWS_SECRET_ACCESS_KEY: GMusLtUmILge2by+z890kQ
+      AWS_ENDPOINT: minio:9000
+      AWS_ENDPOINT_PROTO: http
+      AWS_S3_BUCKET_NAME: backup
+      BACKUP_FILENAME: test.tar.gz
+      BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
+      BACKUP_RETENTION_DAYS: 7
+      BACKUP_PRUNING_LEEWAY: 5s
+    volumes:
+      - pg_data:/backup/pg_data:ro
+      - /var/run/docker.sock:/var/run/docker.sock
+
+  offen:
+    image: offen/offen:latest
+    deploy:
+      labels:
+        - docker-volume-backup.stop-during-backup=true
+      replicas: 2
+
+  pg:
+    image: postgres:14-alpine
+    environment:
+      POSTGRES_PASSWORD: example
+    volumes:
+      - pg_data:/var/lib/postgresql/data
+    deploy:
+      labels:
+        - docker-volume-backup.stop-during-backup=true
+
+volumes:
+  backup_data:
+    name: backup_data
+  pg_data:
+    name: pg_data

test/services/run.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+set -e
+
+cd $(dirname $0)
+. ../util.sh
+current_test=$(basename $(pwd))
+
+docker swarm init
+
+docker stack deploy --compose-file=docker-compose.yml test_stack
+
+while [ -z $(docker ps -q -f name=backup) ]; do
+  info "Backup container not ready yet. Retrying."
+  sleep 1
+done
+
+sleep 20
+
+docker exec $(docker ps -q -f name=backup) backup
+
+docker run --rm \
+  -v backup_data:/data alpine \
+  ash -c 'tar -xf /data/backup/test.tar.gz && test -f /backup/pg_data/PG_VERSION'
+
+pass "Found relevant files in untared backup."
+
+sleep 5
+expect_running_containers "5"