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Chris LuandGitHub
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* operation: give an encrypted chunk the plaintext ETag With -encryptVolumeData the volume server stores ciphertext, so it cannot echo a Content-MD5 back and the chunk lands with an empty ETag. Every ETag derived from those chunks then comes out empty for a single chunk, or d41d8cd98f00b204e9800998ecf8427e-N for several. The caller already hashes the plaintext to send as Content-MD5, so keep that digest as the chunk ETag instead of dropping it, and compute it for a WantMd5 caller under cipher too. * s3: re-encrypt a part copy from a volume-encrypted source UploadPartCopy raw-copies source chunks when neither side uses SSE, which also caught -encryptVolumeData sources. Those chunks are ciphertext a whole-chunk cipher key decrypts, so copying a byte range out of one and keeping the key leaves a destination that fails authentication on GET, and the copied chunks carry no ETag for the part result to report. Route them through the re-encrypting path already used for SSE: it reads the source as plaintext, hashes the part, and writes the destination under the gateway's own encryption. * s3: fetch only the range a part copy asked for The re-encrypting UploadPartCopy path opened the source at offset 0 and threw the prefix away, so assembling an object part by part read the source once per part. Now that volume-encrypted sources take this path too, that is the common case rather than an SSE corner. The chunk stream already seeks, so hand it the range. * s3: reject an unsatisfiable copy-source-range A part copy has no way to report a short part, so a range reaching past the source cannot be clamped the way a GET clamps one. The fast path silently produced a part shorter than asked for, or an empty one; the re-encrypting path pads with zeros, so a 2 MiB source copied as bytes=1048576-9999999 came back as 1 MiB of data followed by 7.5 MiB of nothing. Answer InvalidRange instead, which is what s3-tests' test_multipart_copy_invalid_range expects.