backup: report files whose chunks failed to upload

internal/archiver/blob_saver.go

@@ -2,6 +2,7 @@ package archiver
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/restic"
@@ -43,9 +44,9 @@ func (s *BlobSaver) TriggerShutdown() {
 
 // Save stores a blob in the repo. It checks the index and the known blobs
 // before saving anything. It takes ownership of the buffer passed in.
-func (s *BlobSaver) Save(ctx context.Context, t restic.BlobType, buf *Buffer, cb func(res SaveBlobResponse)) {
+func (s *BlobSaver) Save(ctx context.Context, t restic.BlobType, buf *Buffer, filename string, cb func(res SaveBlobResponse)) {
 	select {
-	case s.ch <- saveBlobJob{BlobType: t, buf: buf, cb: cb}:
+	case s.ch <- saveBlobJob{BlobType: t, buf: buf, fn: filename, cb: cb}:
 	case <-ctx.Done():
 		debug.Log("not sending job, context is cancelled")
 	}
@@ -54,6 +55,7 @@ func (s *BlobSaver) Save(ctx context.Context, t restic.BlobType, buf *Buffer, cb
 type saveBlobJob struct {
 	restic.BlobType
 	buf *Buffer
+	fn  string
 	cb  func(res SaveBlobResponse)
 }
 
@@ -95,7 +97,7 @@ func (s *BlobSaver) worker(ctx context.Context, jobs <-chan saveBlobJob) error {
 		res, err := s.saveBlob(ctx, job.BlobType, job.buf.Data)
 		if err != nil {
 			debug.Log("saveBlob returned error, exiting: %v", err)
-			return err
+			return fmt.Errorf("failed to save blob from file %q: %w", job.fn, err)
 		}
 		job.cb(res)
 		job.buf.Release()

internal/archiver/blob_saver_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"runtime"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"testing"
@@ -11,6 +12,7 @@ import (
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/index"
 	"github.com/restic/restic/internal/restic"
+	rtest "github.com/restic/restic/internal/test"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -57,7 +59,7 @@ func TestBlobSaver(t *testing.T) {
 		lock.Lock()
 		results = append(results, SaveBlobResponse{})
 		lock.Unlock()
-		b.Save(ctx, restic.DataBlob, buf, func(res SaveBlobResponse) {
+		b.Save(ctx, restic.DataBlob, buf, "file", func(res SaveBlobResponse) {
 			lock.Lock()
 			results[idx] = res
 			lock.Unlock()
@@ -106,7 +108,7 @@ func TestBlobSaverError(t *testing.T) {
 
 			for i := 0; i < test.blobs; i++ {
 				buf := &Buffer{Data: []byte(fmt.Sprintf("foo%d", i))}
-				b.Save(ctx, restic.DataBlob, buf, func(res SaveBlobResponse) {})
+				b.Save(ctx, restic.DataBlob, buf, "errfile", func(res SaveBlobResponse) {})
 			}
 
 			b.TriggerShutdown()
@@ -116,9 +118,8 @@ func TestBlobSaverError(t *testing.T) {
 				t.Errorf("expected error not found")
 			}
 
-			if err != errTest {
+			rtest.Assert(t, errors.Is(err, errTest), "unexpected error %v", err)
-				t.Fatalf("unexpected error found: %v", err)
+			rtest.Assert(t, strings.Contains(err.Error(), "errfile"), "expected error to contain 'errfile' got: %v", err)
-			}
 		})
 	}
 }

internal/archiver/file_saver.go

@@ -16,7 +16,7 @@ import (
 )
 
 // SaveBlobFn saves a blob to a repo.
-type SaveBlobFn func(context.Context, restic.BlobType, *Buffer, func(res SaveBlobResponse))
+type SaveBlobFn func(context.Context, restic.BlobType, *Buffer, string, func(res SaveBlobResponse))
 
 // FileSaver concurrently saves incoming files to the repo.
 type FileSaver struct {
@@ -205,7 +205,7 @@ func (s *FileSaver) saveFile(ctx context.Context, chnker *chunker.Chunker, snPat
 		node.Content = append(node.Content, restic.ID{})
 		lock.Unlock()
 
-		s.saveBlob(ctx, restic.DataBlob, buf, func(sbr SaveBlobResponse) {
+		s.saveBlob(ctx, restic.DataBlob, buf, target, func(sbr SaveBlobResponse) {
 			lock.Lock()
 			if !sbr.known {
 				fnr.stats.DataBlobs++

internal/archiver/file_saver_test.go

@@ -33,7 +33,7 @@ func createTestFiles(t testing.TB, num int) (files []string) {
 func startFileSaver(ctx context.Context, t testing.TB) (*FileSaver, context.Context, *errgroup.Group) {
 	wg, ctx := errgroup.WithContext(ctx)
 
-	saveBlob := func(ctx context.Context, tpe restic.BlobType, buf *Buffer, cb func(SaveBlobResponse)) {
+	saveBlob := func(ctx context.Context, tpe restic.BlobType, buf *Buffer, _ string, cb func(SaveBlobResponse)) {
 		cb(SaveBlobResponse{
 			id:         restic.Hash(buf.Data),
 			length:     len(buf.Data),

internal/archiver/tree_saver.go

@@ -11,7 +11,7 @@ import (
 
 // TreeSaver concurrently saves incoming trees to the repo.
 type TreeSaver struct {
-	saveBlob func(ctx context.Context, t restic.BlobType, buf *Buffer, cb func(res SaveBlobResponse))
+	saveBlob SaveBlobFn
 	errFn    ErrorFunc
 
 	ch chan<- saveTreeJob
@@ -19,7 +19,7 @@ type TreeSaver struct {
 
 // NewTreeSaver returns a new tree saver. A worker pool with treeWorkers is
 // started, it is stopped when ctx is cancelled.
-func NewTreeSaver(ctx context.Context, wg *errgroup.Group, treeWorkers uint, saveBlob func(ctx context.Context, t restic.BlobType, buf *Buffer, cb func(res SaveBlobResponse)), errFn ErrorFunc) *TreeSaver {
+func NewTreeSaver(ctx context.Context, wg *errgroup.Group, treeWorkers uint, saveBlob SaveBlobFn, errFn ErrorFunc) *TreeSaver {
 	ch := make(chan saveTreeJob)
 
 	s := &TreeSaver{
@@ -126,7 +126,7 @@ func (s *TreeSaver) save(ctx context.Context, job *saveTreeJob) (*restic.Node, I
 
 	b := &Buffer{Data: buf}
 	ch := make(chan SaveBlobResponse, 1)
-	s.saveBlob(ctx, restic.TreeBlob, b, func(res SaveBlobResponse) {
+	s.saveBlob(ctx, restic.TreeBlob, b, job.target, func(res SaveBlobResponse) {
 		ch <- res
 	})
 

internal/archiver/tree_saver_test.go

@@ -12,7 +12,7 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-func treeSaveHelper(_ context.Context, _ restic.BlobType, buf *Buffer, cb func(res SaveBlobResponse)) {
+func treeSaveHelper(_ context.Context, _ restic.BlobType, buf *Buffer, _ string, cb func(res SaveBlobResponse)) {
 	cb(SaveBlobResponse{
 		id:         restic.NewRandomID(),
 		known:      false,