docker-volume-backup/cmd/backup/prune_backups.go

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// Copyright 2024 - offen.software <hioffen@posteo.de>
// SPDX-License-Identifier: MPL-2.0
package main
import (
"fmt"
"slices"
"strings"
"time"
"github.com/offen/docker-volume-backup/internal/errwrap"
"golang.org/x/sync/errgroup"
)
// pruneBackups rotates away backups from local and remote storages using
// the given configuration. In case the given configuration would delete all
// backups, it does nothing instead and logs a warning.
func (s *script) pruneBackups() error {
if s.c.BackupRetentionDays < 0 {
return nil
}
deadline := time.Now().AddDate(0, 0, -int(s.c.BackupRetentionDays)).Add(s.c.BackupPruningLeeway)
eg := errgroup.Group{}
for _, backend := range s.storages {
b := backend
eg.Go(func() error {
if skipPrune(b.Name(), s.c.BackupSkipBackendsFromPrune) {
s.logger.Info(
fmt.Sprintf("Skipping pruning for backend `%s`.", b.Name()),
)
return nil
}
stats, err := b.Prune(deadline, s.c.BackupPruningPrefix)
if err != nil {
return err
}
s.stats.Lock()
s.stats.Storages[b.Name()] = StorageStats{
Total: stats.Total,
Pruned: stats.Pruned,
}
s.stats.Unlock()
return nil
})
}
if err := eg.Wait(); err != nil {
return errwrap.Wrap(err, "error pruning backups")
}
return nil
}
// skipPrune returns true if the given backend name is contained in the
// list of skipped backends.
func skipPrune(name string, skippedBackends []string) bool {
return slices.ContainsFunc(
skippedBackends,
func(b string) bool {
return strings.EqualFold(b, name) // ignore case on both sides
},
)
}