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The `index_blob_packfile_transaction()` function handles streaming a blob from an fd to compute its object ID and conditionally writes the object directly to a packfile if the INDEX_WRITE_OBJECT flag is set. A subsequent commit will make these packfile object writes part of the transaction interface. Consequently, having the object write be conditional on this flag is a bit awkward. In preparation for this change, introduce a dedicated `hash_blob_stream()` helper that only computes the OID from a `struct odb_write_stream`. This is invoked by `index_fd()` instead when the INDEX_WRITE_OBJECT is not set. The object write performed via `index_blob_packfile_transaction()` is made unconditional accordingly. Signed-off-by: Justin Tobler <jltobler@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>