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Always HEAD blobs at least once during pushes

Signed-off-by: Jon Johnson <jonjohnson@google.com>

Jon Johnson authored on 2017/03/08 14:56:46
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@@ -283,8 +283,8 @@ func (pd *v2PushDescriptor) Upload(ctx context.Context, progressOutput progress.
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 	// Do we have any metadata associated with this layer's DiffID?
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 	v2Metadata, err := pd.v2MetadataService.GetMetadata(diffID)
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 	if err == nil {
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-		// check for blob existence in the target repository if we have a mapping with it
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-		descriptor, exists, err := pd.layerAlreadyExists(ctx, progressOutput, diffID, false, 1, v2Metadata)
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+		// check for blob existence in the target repository
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+		descriptor, exists, err := pd.layerAlreadyExists(ctx, progressOutput, diffID, true, 1, v2Metadata)
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 		if exists || err != nil {
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 			return descriptor, err
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 		}