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Ben McClelland
29256f0ab5
Introduce an opt-in mode that derives ETags from checksums instead of relying on MD5 assumptions, aligning with AWS-compatible scenarios where ETag should be treated as an opaque identifier rather than a content-MD5 signal. This can significantly reduce CPU load on the server to disable MD5 checksums when we are already validating data with other checksums. This change adds --data-integrity-etag and VGW_DATA_INTEGRITY_ETAG support for both posix and scoutfs backends. In this mode, PUT object ETags, multipart part ETags, and completed multipart object ETags are checksum-derived.