mirror of
https://github.com/offen/docker-volume-backup.git
synced 2024-12-23 17:30:20 +01:00
168 lines
3.7 KiB
Go
168 lines
3.7 KiB
Go
// Copyright 2022 - offen.software <hioffen@posteo.de>
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// SPDX-License-Identifier: MPL-2.0
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package local
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"path"
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"path/filepath"
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"time"
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"github.com/offen/docker-volume-backup/internal/errwrap"
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"github.com/offen/docker-volume-backup/internal/storage"
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)
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type localStorage struct {
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*storage.StorageBackend
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latestSymlink string
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}
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// Config allows configuration of a local storage backend.
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type Config struct {
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ArchivePath string
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LatestSymlink string
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}
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// NewStorageBackend creates and initializes a new local storage backend.
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func NewStorageBackend(opts Config, logFunc storage.Log) storage.Backend {
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return &localStorage{
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StorageBackend: &storage.StorageBackend{
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DestinationPath: opts.ArchivePath,
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Log: logFunc,
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},
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latestSymlink: opts.LatestSymlink,
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}
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}
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// Name return the name of the storage backend
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func (b *localStorage) Name() string {
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return "Local"
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}
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// Copy copies the given file to the local storage backend.
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func (b *localStorage) Copy(file string) error {
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_, name := path.Split(file)
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if err := copyFile(file, path.Join(b.DestinationPath, name)); err != nil {
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return errwrap.Wrap(err, "error copying file to archive")
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}
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b.Log(storage.LogLevelInfo, b.Name(), "Stored copy of backup `%s` in `%s`.", file, b.DestinationPath)
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if b.latestSymlink != "" {
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symlink := path.Join(b.DestinationPath, b.latestSymlink)
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if _, err := os.Lstat(symlink); err == nil {
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os.Remove(symlink)
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}
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if err := os.Symlink(name, symlink); err != nil {
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return errwrap.Wrap(err, "error creating latest symlink")
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}
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b.Log(storage.LogLevelInfo, b.Name(), "Created/Updated symlink `%s` for latest backup.", b.latestSymlink)
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}
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return nil
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}
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// Prune rotates away backups according to the configuration and provided deadline for the local storage backend.
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func (b *localStorage) Prune(deadline time.Time, pruningPrefix string) (*storage.PruneStats, error) {
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globPattern := path.Join(
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b.DestinationPath,
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fmt.Sprintf("%s*", pruningPrefix),
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)
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globMatches, err := filepath.Glob(globPattern)
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if err != nil {
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return nil, errwrap.Wrap(
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err,
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fmt.Sprintf(
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"error looking up matching files using pattern %s",
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globPattern,
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),
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)
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}
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var candidates []string
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for _, candidate := range globMatches {
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fi, err := os.Lstat(candidate)
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if err != nil {
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return nil, errwrap.Wrap(
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err,
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fmt.Sprintf(
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"error calling Lstat on file %s",
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candidate,
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),
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)
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}
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if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
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candidates = append(candidates, candidate)
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}
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}
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var matches []string
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for _, candidate := range candidates {
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fi, err := os.Stat(candidate)
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if err != nil {
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return nil, errwrap.Wrap(
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err,
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fmt.Sprintf(
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"error calling stat on file %s",
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candidate,
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),
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)
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}
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if fi.ModTime().Before(deadline) {
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matches = append(matches, candidate)
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}
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}
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stats := &storage.PruneStats{
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Total: uint(len(candidates)),
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Pruned: uint(len(matches)),
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}
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pruneErr := b.DoPrune(b.Name(), len(matches), len(candidates), deadline, func() error {
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var removeErrors []error
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for _, match := range matches {
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if err := os.Remove(match); err != nil {
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removeErrors = append(removeErrors, err)
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}
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}
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if len(removeErrors) != 0 {
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return errwrap.Wrap(
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errors.Join(removeErrors...),
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fmt.Sprintf(
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"%d error(s) deleting files",
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len(removeErrors),
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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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return stats, pruneErr
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}
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// copy creates a copy of the file located at `dst` at `src`.
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func copyFile(src, dst string) error {
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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out, err := os.Create(dst)
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if err != nil {
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return err
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}
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_, err = io.Copy(out, in)
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if err != nil {
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out.Close()
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return err
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}
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return out.Close()
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}
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