Error invoking barman-cloud-backup-delete: 'BackupInfo' object has no attribute 'encryption' and no __dict__ for setting new attributes

Hi,

Pruning of old backups is broken right now. I have attached the details of my deployment:

```
❯ k cnpg version
Build: {Version:1.25.0 Commit:bad5a251 Date:2024-12-23}
```

```
Image ID: ghcr.io/cloudnative-pg/plugin-barman-cloud-sidecar-testing@sha256:77a3497a7c98bd1950329a9fdb62005f823ed2e84de1fc7430fde892d313f7d0
```

```
Image: ghcr.io/cloudnative-pg/cloudnative-pg:1.26.1
Image ID: ghcr.io/cloudnative-pg/cloudnative-pg@sha256:dfb65c0b6b14e6fb10d36a4e46c0368c062adf5f436c7b0ff0251d408cc34c07
```

I have deployed the plugin using kustomization: `https://github.com/cloudnative-pg/plugin-barman-cloud/kubernetes?ref=v0.5.0`

## Log
```
{"level":"error","ts":"2025-07-30T06:55:15.259932953Z","msg":"Retention policy enforcement failed","logging_pod":"database-1","error":"exit status 1","stacktrace":"github.com/cloudnative-pg/machinery/pkg/log.(*logger).Error\n\t/go/pkg/mod/github.com/cloudnative-pg/machinery@v0.2.0/pkg/log/log.go:125\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).Start\n\t/workspace/internal/cnpgi/instance/retention.go:50\nsigs.k8s.io/controller-runtime/pkg/manager.(*runnableGroup).reconcile.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/manager/runnable_group.go:226"}
{"level":"info","ts":"2025-07-30T07:00:15.286258466Z","msg":"Applying backup retention policy","logging_pod":"database-1","retentionPolicy":"10d"}
{"level":"error","ts":"2025-07-30T07:00:18.680113524Z","logger":"barman","msg":"Error invoking barman-cloud-backup-delete","logging_pod":"database-1","options":["--endpoint-url","https://host","--cloud-provider","aws-s3","--retention-policy","RECOVERY WINDOW OF 10 DAYS","s3://bucket/path/","database"],"stdout":"","stderr":"2025-07-30 07:00:18,079 [257141] WARNING: Unable to open backup.info file for 20250717T060002: 'BackupInfo' object has no attribute 'encryption' and no __dict__ for setting new attributes\n2025-07-30 07:00:18,256 [257141] WARNING: Unable to open backup.info file for 20250721T060003: 'BackupInfo' object has no attribute 'encryption' and no __dict__ for setting new attributes\n2025-07-30 07:00:18,343 [257141] WARNING: Unable to open backup.info file for 20250724T060002: 'BackupInfo' object has no attribute 'encryption' and no __dict__ for setting new attributes\n2025-07-30 07:00:18,453 [257141] WARNING: Unable to open backup.info file for 20250728T060002: 'BackupInfo' object has no attribute 'encryption' and no __dict__ for setting new attributes\n2025-07-30 07:00:18,454 [257141] ERROR: Cannot read the following backups: ['20250717T060002', '20250721T060003', '20250724T060002', '20250728T060002']\nUnsafe to proceed with deletion due to failure reading backup catalog\n","error":"exit status 1","stacktrace":"github.com/cloudnative-pg/machinery/pkg/log.(*logger).Error\n\t/go/pkg/mod/github.com/cloudnative-pg/machinery@v0.2.0/pkg/log/log.go:125\ngithub.com/cloudnative-pg/barman-cloud/pkg/command.DeleteBackupsByPolicy\n\t/go/pkg/mod/github.com/cloudnative-pg/barman-cloud@v0.3.1/pkg/command/backupdelete.go:71\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).maintenance\n\t/workspace/internal/cnpgi/instance/retention.go:131\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).cycle\n\t/workspace/internal/cnpgi/instance/retention.go:80\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).Start\n\t/workspace/internal/cnpgi/instance/retention.go:48\nsigs.k8s.io/controller-runtime/pkg/manager.(*runnableGroup).reconcile.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/manager/runnable_group.go:226"}
{"level":"error","ts":"2025-07-30T07:00:18.680195245Z","msg":"while enforcing retention policies","logging_pod":"database-1","error":"exit status 1","stacktrace":"github.com/cloudnative-pg/machinery/pkg/log.(*logger).Error\n\t/go/pkg/mod/github.com/cloudnative-pg/machinery@v0.2.0/pkg/log/log.go:125\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).maintenance\n\t/workspace/internal/cnpgi/instance/retention.go:138\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).cycle\n\t/workspace/internal/cnpgi/instance/retention.go:80\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).Start\n\t/workspace/internal/cnpgi/instance/retention.go:48\nsigs.k8s.io/controller-runtime/pkg/manager.(*runnableGroup).reconcile.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/manager/runnable_group.go:226"}
{"level":"error","ts":"2025-07-30T07:00:18.680248606Z","msg":"Retention policy enforcement failed","logging_pod":"database-1","error":"exit status 1","stacktrace":"github.com/cloudnative-pg/machinery/pkg/log.(*logger).Error\n\t/go/pkg/mod/github.com/cloudnative-pg/machinery@v0.2.0/pkg/log/log.go:125\ngithub.com/cloudnative-pg/plugin-barman-cloud/internal/cnpgi/instance.(*CatalogMaintenanceRunnable).Start\n\t/workspace/internal/cnpgi/instance/retention.go:50\nsigs.k8s.io/controller-runtime/pkg/manager.(*runnableGroup).reconcile.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/manager/runnable_group.go:226"}
```

Please advise. Thank you!

Commencez par internal/cnpgi/instance/retention.go, en particulier CatalogMaintenanceRunnable. Suivez son appel jusqu’à barman-cloud/pkg/command/backupdelete.go et reproduisez l’échec avec les versions du plugin et de l’image signalées. C’est terminé lorsque l’application de la rétention peut lire les catalogues de sauvegardes indiqués et supprimer des sauvegardes sans l’erreur de chiffrement de BackupInfo.

Rédigé par le modèle d'indexation à partir du texte de l'issue.