mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-11-21 21:10:26 +01:00
scaffold script flow
This commit is contained in:
parent
efb52aa806
commit
8b110fd789
@ -12,9 +12,7 @@ FROM alpine:3.14
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WORKDIR /root
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RUN apk add --update ca-certificates docker openrc gnupg
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RUN update-ca-certificates
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RUN rc-update add docker boot
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RUN apk add --update ca-certificates
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COPY --from=builder /app/backup /usr/bin/backup
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215
src/main.go
215
src/main.go
@ -2,8 +2,10 @@ package main
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import (
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"context"
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"errors"
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"fmt"
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"os"
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"time"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/filters"
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@ -13,82 +15,181 @@ import (
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)
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func main() {
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if err := godotenv.Load("/etc/backup.env"); err != nil {
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s := &script{}
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defer func() {
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for _, thunk := range s.cleanupTasks {
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thunk()
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}
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}()
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s.lock()
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defer s.unlock()
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if err := s.init(); err != nil {
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panic(err)
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}
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ctx := context.Background()
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cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
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if err != nil {
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if err := s.stopContainers(); err != nil {
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panic(err)
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}
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if err := s.takeBackup(); err != nil {
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panic(err)
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}
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if err := s.restartContainers(); err != nil {
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panic(err)
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}
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if err := s.encryptBackup(); err != nil {
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panic(err)
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}
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if err := s.copyBackup(); err != nil {
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panic(err)
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}
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if err := s.cleanBackup(); err != nil {
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panic(err)
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}
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if err := s.pruneBackups(); err != nil {
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panic(err)
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}
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}
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type script struct {
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ctx context.Context
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cli *client.Client
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stoppedContainers []types.Container
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file string
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cleanupTasks []func()
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}
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func (s *script) lock() {}
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func (s *script) unlock() {}
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func (s *script) init() error {
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s.ctx = context.Background()
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if timeout, ok := os.LookupEnv("BACKUP_TIMEOUT_DURATION"); ok {
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d, err := time.ParseDuration(timeout)
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if err != nil {
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return fmt.Errorf("init: error parsing given timeout duration: %w", err)
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}
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withTimeout, cancelFunc := context.WithTimeout(context.Background(), d)
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s.ctx = withTimeout
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s.cleanupTasks = append(s.cleanupTasks, cancelFunc)
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}
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if err := godotenv.Load("/etc/backup.env"); err != nil {
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return fmt.Errorf("init: failed to load env file: %w", err)
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}
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socketExists, err := fileExists("/var/run/docker.sock")
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if err != nil {
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panic(err)
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return fmt.Errorf("init: error checking whether docker.sock is available: %w", err)
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}
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var containersToStop []types.Container
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if socketExists {
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containersToStop, err = cli.ContainerList(ctx, types.ContainerListOptions{
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Quiet: true,
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Filters: filters.NewArgs(filters.KeyValuePair{
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Key: "label",
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Value: fmt.Sprintf("docker-volume-backup.stop-during-backup=%s", os.Getenv("BACKUP_STOP_CONTAINER_LABEL")),
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}),
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})
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cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
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if err != nil {
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return fmt.Errorf("init: failied to create docker client")
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}
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s.cli = cli
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}
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return nil
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}
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func (s *script) stopContainers() error {
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if s.cli == nil {
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return nil
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}
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stoppedContainers, err := s.cli.ContainerList(s.ctx, types.ContainerListOptions{
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Quiet: true,
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Filters: filters.NewArgs(filters.KeyValuePair{
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Key: "label",
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Value: fmt.Sprintf("docker-volume-backup.stop-during-backup=%s", os.Getenv("BACKUP_STOP_CONTAINER_LABEL")),
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}),
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})
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s.stoppedContainers = stoppedContainers
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if err != nil {
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return fmt.Errorf("stopContainers: error querying for containers to stop: %w", err)
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}
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fmt.Printf("Stopping %d containers\n", len(s.stoppedContainers))
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if len(s.stoppedContainers) != 0 {
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fmt.Println("Stopping containers")
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for _, container := range s.stoppedContainers {
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if err := s.cli.ContainerStop(s.ctx, container.ID, nil); err != nil {
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return fmt.Errorf("stopContainers: error stopping container %s: %w", container.Names[0], err)
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}
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}
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}
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return nil
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}
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func (s *script) takeBackup() error {
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return errors.New("takeBackup: not implemented yet")
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}
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func (s *script) restartContainers() error {
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fmt.Println("Starting containers/services back up")
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servicesRequiringUpdate := map[string]struct{}{}
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for _, container := range s.stoppedContainers {
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if swarmServiceName, ok := container.Labels["com.docker.swarm.service.name"]; ok {
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servicesRequiringUpdate[swarmServiceName] = struct{}{}
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continue
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}
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if err := s.cli.ContainerStart(s.ctx, container.ID, types.ContainerStartOptions{}); err != nil {
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panic(err)
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}
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fmt.Printf("Stopping %d containers\n", len(containersToStop))
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}
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if len(containersToStop) != 0 {
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fmt.Println("Stopping containers")
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for _, container := range containersToStop {
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if err := cli.ContainerStop(ctx, container.ID, nil); err != nil {
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panic(err)
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}
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}
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}
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fmt.Println("Creating backup")
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// TODO: Implement backup
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if len(containersToStop) != 0 {
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fmt.Println("Starting containers/services back up")
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servicesRequiringUpdate := map[string]struct{}{}
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for _, container := range containersToStop {
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if swarmServiceName, ok := container.Labels["com.docker.swarm.service.name"]; ok {
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servicesRequiringUpdate[swarmServiceName] = struct{}{}
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continue
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}
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if err := cli.ContainerStart(ctx, container.ID, types.ContainerStartOptions{}); err != nil {
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panic(err)
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}
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}
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if len(servicesRequiringUpdate) != 0 {
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services, _ := cli.ServiceList(ctx, types.ServiceListOptions{})
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for serviceName := range servicesRequiringUpdate {
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var serviceMatch swarm.Service
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for _, service := range services {
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if service.Spec.Name == serviceName {
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serviceMatch = service
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break
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}
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if len(servicesRequiringUpdate) != 0 {
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services, _ := s.cli.ServiceList(s.ctx, types.ServiceListOptions{})
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for serviceName := range servicesRequiringUpdate {
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var serviceMatch swarm.Service
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for _, service := range services {
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if service.Spec.Name == serviceName {
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serviceMatch = service
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break
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}
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if serviceMatch.ID == "" {
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panic(fmt.Sprintf("Couldn't find service with name %s", serviceName))
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}
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serviceMatch.Spec.TaskTemplate.ForceUpdate = 1
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cli.ServiceUpdate(
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ctx, serviceMatch.ID,
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serviceMatch.Version, serviceMatch.Spec, types.ServiceUpdateOptions{},
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)
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}
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if serviceMatch.ID == "" {
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return fmt.Errorf("restartContainers: Couldn't find service with name %s", serviceName)
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}
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serviceMatch.Spec.TaskTemplate.ForceUpdate = 1
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s.cli.ServiceUpdate(
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s.ctx, serviceMatch.ID,
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serviceMatch.Version, serviceMatch.Spec, types.ServiceUpdateOptions{},
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)
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}
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}
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return nil
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}
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func (s *script) encryptBackup() error {
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_, ok := os.LookupEnv("GPG_PASSPHRASE")
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if !ok {
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return nil
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}
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return errors.New("encryptBackup: not implemented yet")
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}
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func (s *script) copyBackup() error {
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return errors.New("copyBackup: not implemented yet")
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}
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func (s *script) cleanBackup() error {
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return errors.New("cleanBackup: not implemented yet")
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}
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func (s *script) pruneBackups() error {
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_, ok := os.LookupEnv("BACKUP_RETENTION_DAYS")
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if !ok {
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return nil
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}
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return errors.New("pruneBackups: not implemented yet")
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}
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func fileExists(location string) (bool, error) {
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