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implement pruning from remote storage

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This commit is contained in:
Frederik Ring 2021-08-22 15:04:44 +02:00
parent f2739b583e
commit 8c99ec0bdf
1 changed files with 69 additions and 12 deletions
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81
src/main.go
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@ -141,7 +141,11 @@ func (s *script) stopContainers() error {
if len(containersToStop) != 0 {
for _, container := range s.stoppedContainers {
if err := s.cli.ContainerStop(s.ctx, container.ID, nil); err != nil {
return fmt.Errorf("stopContainers: error stopping container %s: %w", container.Names[0], err)
return fmt.Errorf(
"stopContainers: error stopping container %s: %w",
container.Names[0],
err,
)
}
}
}
@ -255,6 +259,7 @@ func (s *script) copyBackup() error {
return fmt.Errorf("copyBackup: error uploading backup to remote storage: %w", err)
}
}
if archive := os.Getenv("BACKUP_ARCHIVE"); archive != "" {
if _, err := os.Stat(archive); !os.IsNotExist(err) {
if err := copy(s.file, path.Join(archive, name)); err != nil {
@ -290,34 +295,86 @@ func (s *script) pruneOldBackups() error {
deadline := time.Now().AddDate(0, 0, -retentionDays)
if bucket := os.Getenv("AWS_S3_BUCKET_NAME"); bucket != "" {
candidates := s.mc.ListObjects(s.ctx, bucket, minio.ListObjectsOptions{
WithMetadata: true,
Prefix: os.Getenv("BACKUP_PRUNING_PREFIX"),
})
var matches []minio.ObjectInfo
for candidate := range candidates {
if candidate.LastModified.Before(deadline) {
matches = append(matches, candidate)
}
}
if len(matches) != len(candidates) {
objectsCh := make(chan minio.ObjectInfo)
go func() {
for _, candidate := range matches {
objectsCh <- candidate
}
}()
errChan := s.mc.RemoveObjects(s.ctx, bucket, objectsCh, minio.RemoveObjectsOptions{})
var errors []error
for result := range errChan {
if result.Err != nil {
errors = append(errors, result.Err)
}
}
if len(errors) != 0 {
return fmt.Errorf(
"pruneOldBackups: %d errors removing files from remote storage: %w",
len(errors),
errors[0],
)
}
} else if len(candidates) != 0 {
fmt.Println("Refusing to delete all backups. Check your configuration.")
}
}
if archive := os.Getenv("BACKUP_ARCHIVE"); archive != "" {
matches, err := filepath.Glob(
candidates, err := filepath.Glob(
path.Join(archive, fmt.Sprintf("%s%s", os.Getenv("BACKUP_PRUNING_PREFIX"), "*")),
)
if err != nil {
return fmt.Errorf("pruneOldBackups: error looking up matching files: %w", err)
return fmt.Errorf(
"pruneOldBackups: error looking up matching files, starting with: %w", err,
)
}
var candidates []os.FileInfo
for _, match := range matches {
fi, err := os.Stat(match)
var matches []os.FileInfo
for _, candidate := range candidates {
fi, err := os.Stat(candidate)
if err != nil {
return fmt.Errorf("pruneOldBackups: error calling stat on file %s: %w", match, err)
return fmt.Errorf(
"pruneOldBackups: error calling stat on file %s: %w",
candidate,
err,
)
}
if fi.ModTime().Before(deadline) {
candidates = append(candidates, fi)
matches = append(matches, fi)
}
}
if len(candidates) != len(matches) {
for _, candidate := range candidates {
if len(matches) != len(candidates) {
var errors []error
for _, candidate := range matches {
if err := os.Remove(candidate.Name()); err != nil {
return fmt.Errorf("pruneOldBackups: error deleting file %s: %w", candidate.Name(), err)
errors = append(errors, err)
}
}
} else if len(matches) != 0 {
if len(errors) != 0 {
return fmt.Errorf(
"pruneOldBackups: %d errors deleting local files, starting with: %w",
len(errors),
errors[0],
)
}
} else if len(candidates) != 0 {
fmt.Println("Refusing to delete all backups. Check your configuration.")
}
}