rgw: add xml output header in RGWCopyObj_ObjStore_S3 response msg

[ZVampirEM77]

Fixes: http://tracker.ceph.com/issues/22416

When move object by s3cmd mv, s3cmd will do four things:

• get source object acl
• copy source object from source bucket to destination bucket and destination object
• put acl for destination object
• delete source object in source bucket

But in RGW now, the s3cmd mv will put a new object in destination bucket without deleting the
source object in source bucket, this is not same with S3, eg:

s3cmd ls s3://bucket1
2017-12-13 04:04 1871 s3://bucket1/obj1
2017-12-13 04:04 8034 s3://bucket1/obj2

s3cmd mv s3://bucket1/obj1 s3://bucket1/obj3
move: 's3://bucket1/obj1' -> 's3://bucket1/obj3'

s3cmd ls s3://bucket1
2017-12-13 04:04 1871 s3://bucket1/obj1
2017-12-13 04:04 8034 s3://bucket1/obj2
2017-12-13 07:06 1871 s3://bucket1/obj3

By reading source code of s3cmd, I found s3cmd would parse the data field in response msg which should contain <?xml version="1.0" encoding="UTF-8"?> to decide whether send delete object request or not.

So now, the result is:

s3cmd ls s3://bucket1
2017-12-13 04:04 1871 s3://bucket1/obj1
2017-12-13 04:04 8034 s3://bucket1/obj2

s3cmd mv s3://bucket1/obj1 s3://bucket1/obj3
move: 's3://bucket1/obj1' -> 's3://bucket1/obj3'

s3cmd ls s3://bucket1
2017-12-13 04:04 8034 s3://bucket1/obj2
2017-12-13 07:06 1871 s3://bucket1/obj3

Signed-off-by: Enming Zhang enming.zhang@umcloud.com

[ZVampirEM77]

Jenkins, retest this please.

[ZVampirEM77]

Jenkins, retest this please.

[ZVampirEM77]

@mattbenjamin @cbodley ping~

[cbodley]

thanks for the detailed analysis! that makes review so much easier 👍

[scienceluo]

LGTM.
Good Job，Enming Bro.

[yuriw]

wip-yuri3-testing-2018-01-02-1716