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@adriansev : I pushed today: 769182c 7c5e272 eb0e7be

this should allow you to use the checksum present in a metalink while extracting a file from ZIP archive.

From comandline (assuming file.meta4 points to a ZIP archive containing file.txt and a md5 checksum for the file):

xrdcp --cksum md5 -f --zip=file.txt --zip-mtln-cksum file.meta4 .
or with an envar
XRD_ZIPMTLNCKSUM=1 xrdcp --cksum md5 -f --zip=file.txt file.meta4 .

You can also enable the functionality from Python by setting ZipMtlnCksum in the environment, e.g.:
EnvPutInt( 'ZipMtlnCksum', 1 )
for more details see: https://github.com/xrootd/xrootd/blob/master/bindings/python/libs/client/env.py#L41

Could you give it a try?

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