Commits on Apr 23, 2021

1. support for hardlinks: extract, tree_hash, rewrite …

   This adds support for hardlinks, including:
   
   - extracting them by copying the linked file (no hardlink created)
   - tree hashing them as they are extracted
   - rewriting by duplicating the linked file
   
   This only supports hardlinks whose target is a plain file that has
   already been seen in the tarball that is being processed. You cannot
   have a hardlink that appears before the file that is linked. If the
   target of a hardlink is overwritten later, the link copies the current
   version of the file at the time of extraction. Tree hashing and rewrite
   are both consistent with this behavior. It is not supported to extract
   hardlinks where the link involves symlinks, even if the link refers to a
   path that would be a file — the target must be a plain file.
   
   Close #101.

   

   StefanKarpinski committed Apr 23, 2021
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