06731dfcae
This is a regression introduced by merging the EBS and S3 images. The EBS images had a special marker /.ebs to prevent the initrd from using ephemeral storage for the unionfs, but this marker was missing in the consolidated image. The fix is to check the file ami-manifest-path on the metadata server to see if we're an S3-based instance. This does require networking in the initrd. Issue #12613.
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