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build: fix panic when exporting to tar

Fixes a panic on `docker build -t foo -o - . >/dev/null`

Signed-off-by: Tibor Vass <tibor@docker.com>
(cherry picked from commit 6104eb1ae2890371ef0f7440514ee505d73d2c0a)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Tibor Vass authored on 2019/06/04 07:34:13
Showing 1 changed files

api/server/backend/build/backend.go index ff7a5a9..0178091 100644

api/server/backend/build/backend.go

History View file @ b915ec1

@@ -91,7 +91,9 @@ func (b *Backend) Build(ctx context.Context, config backend.BuildConfig) (string
                      		stdout := config.ProgressWriter.StdoutFormatter
                      		fmt.Fprintf(stdout, "Successfully built %s\n", stringid.TruncateID(imageID))
+                     	}
                     -	err = tagger.TagImages(image.ID(imageID))
                     +	if imageID != "" {
                     +		err = tagger.TagImages(image.ID(imageID))
                     +	}
                      	return imageID, err
+                     }