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

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// Copyright 2024 - Offen Authors <hioffen@posteo.de>
// SPDX-License-Identifier: MPL-2.0
package main
import (
"fmt"
"io/fs"
"path/filepath"
"github.com/offen/docker-volume-backup/internal/errwrap"
"github.com/otiai10/copy"
)
// createArchive creates a tar archive of the configured backup location and
// saves it to disk.
func (s *script) createArchive() error {
backupSources := s.c.BackupSources
if s.c.BackupFromSnapshot {
s.logger.Warn(
"Using BACKUP_FROM_SNAPSHOT has been deprecated and will be removed in the next major version.",
)
s.logger.Warn(
"Please use `archive-pre` and `archive-post` commands to prepare your backup sources. Refer to the documentation for an upgrade guide.",
)
backupSources = filepath.Join("/tmp", s.c.BackupSources)
// copy before compressing guard against a situation where backup folder's content are still growing.
s.registerHook(hookLevelPlumbing, func(error) error {
if err := remove(backupSources); err != nil {
return errwrap.Wrap(err, "error removing snapshot")
}
s.logger.Info(
fmt.Sprintf("Removed snapshot `%s`.", backupSources),
)
return nil
})
if err := copy.Copy(s.c.BackupSources, backupSources, copy.Options{
PreserveTimes: true,
PreserveOwner: true,
}); err != nil {
return errwrap.Wrap(err, "error creating snapshot")
}
s.logger.Info(
fmt.Sprintf("Created snapshot of `%s` at `%s`.", s.c.BackupSources, backupSources),
)
}
tarFile := s.file
s.registerHook(hookLevelPlumbing, func(error) error {
if err := remove(tarFile); err != nil {
return errwrap.Wrap(err, "error removing tar file")
}
s.logger.Info(
fmt.Sprintf("Removed tar file `%s`.", tarFile),
)
return nil
})
backupPath, err := filepath.Abs(stripTrailingSlashes(backupSources))
if err != nil {
return errwrap.Wrap(err, "error getting absolute path")
}
var filesEligibleForBackup []string
if err := filepath.WalkDir(backupPath, func(path string, di fs.DirEntry, err error) error {
if err != nil {
return err
}
if s.c.BackupExcludeRegexp.Re != nil && s.c.BackupExcludeRegexp.Re.MatchString(path) {
return nil
}
filesEligibleForBackup = append(filesEligibleForBackup, path)
return nil
}); err != nil {
return errwrap.Wrap(err, "error walking filesystem tree")
}
if err := createArchive(filesEligibleForBackup, backupSources, tarFile, s.c.BackupCompression.String(), s.c.GzipParallelism.Int()); err != nil {
return errwrap.Wrap(err, "error compressing backup folder")
}
s.logger.Info(
fmt.Sprintf("Created backup of `%s` at `%s`.", backupSources, tarFile),
)
return nil
}