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This enables the backends to request the calculation of a backend-specific hash. For the currently supported backends this will always be MD5. The hash calculation happens as early as possible, for pack files this is during assembly of the pack file. That way the hash would even capture corruptions of the temporary pack file on disk.
85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
package dryrun
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import (
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"context"
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"hash"
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"io"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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)
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// Backend passes reads through to an underlying layer and accepts writes, but
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// doesn't do anything. Also removes are ignored.
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// So in fact, this backend silently ignores all operations that would modify
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// the repo and does normal operations else.
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// This is used for `backup --dry-run`.
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type Backend struct {
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b restic.Backend
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}
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// statically ensure that RetryBackend implements restic.Backend.
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var _ restic.Backend = &Backend{}
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// New returns a new backend that saves all data in a map in memory.
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func New(be restic.Backend) *Backend {
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b := &Backend{b: be}
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debug.Log("created new dry backend")
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return b
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}
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// Save adds new Data to the backend.
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func (be *Backend) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader) error {
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if err := h.Valid(); err != nil {
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return err
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}
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debug.Log("faked saving %v bytes at %v", rd.Length(), h)
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// don't save anything, just return ok
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return nil
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}
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// Remove deletes a file from the backend.
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func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
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return nil
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}
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// Location returns the location of the backend.
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func (be *Backend) Location() string {
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return "DRY:" + be.b.Location()
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}
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// Delete removes all data in the backend.
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func (be *Backend) Delete(ctx context.Context) error {
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return nil
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}
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func (be *Backend) Close() error {
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return be.b.Close()
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}
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func (be *Backend) Hasher() hash.Hash {
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return be.b.Hasher()
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}
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func (be *Backend) IsNotExist(err error) bool {
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return be.b.IsNotExist(err)
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}
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func (be *Backend) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
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return be.b.List(ctx, t, fn)
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}
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func (be *Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(io.Reader) error) error {
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return be.b.Load(ctx, h, length, offset, fn)
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}
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func (be *Backend) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
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return be.b.Stat(ctx, h)
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}
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func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
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return be.b.Test(ctx, h)
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}
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