If the source supplied fewer bytes than its declared size, the
multipart upload was completed anyway, storing a truncated object and
reporting a successful upload.
Check the number of bytes read from the source against the declared
size before finalising and abort the upload with an error if they do
not match.
This affects all backends which use lib/multipart for chunked uploads:
azureblob, b2, drime, internxt, oracleobjectstorage, s3 and shade.
This was found by the new FsPutShortEOF and TestRcatSizeShortEOF
integration tests.
Nick Craig-Wood
5b7cc097e3