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docs: s3: clarify that X-Amz-Meta-Md5chksum is really a base64-encoded hex

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dlitster 2023-04-25 05:39:36 -05:00 committed by GitHub
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docs/content/s3.md
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@ -380,7 +380,11 @@ However for objects which were uploaded as multipart uploads or with
server side encryption (SSE-AWS or SSE-C) the `ETag` header is no
longer the MD5 sum of the data, so rclone adds an additional piece of
metadata `X-Amz-Meta-Md5chksum` which is a base64 encoded MD5 hash (in
the same format as is required for `Content-MD5`).
the same format as is required for `Content-MD5`). You can use base64 -d and hexdump to check this value manually:
echo 'VWTGdNx3LyXQDfA0e2Edxw==' | base64 -d | hexdump
or you can use `rclone check` to verify the hashes are OK.
For large objects, calculating this hash can take some time so the
addition of this hash can be disabled with `--s3-disable-checksum`.