hashsum: add --download-if-missing flag - fixes #8996 - #9862
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What is the purpose of this change?
Adds an opt-in
--download-if-missingflag tohashsum,md5sum, andsha1sum.Previously, users had to choose between requesting hashes from the remote (which skips files if the remote does not calculate that hash) and
--download(which downloads and re-hashes every file, even those where the remote already had a valid hash).With
--download-if-missing, rclone queries the remote for the hash first and only downloads the file to calculate the checksum locally if the remote returns an empty hash orhash.ErrUnsupported.Was the change discussed in an issue or in the forum before?
Fixes #8996
Checklist
download-if-missingflag and documentation forhashsum,md5sum, andsha1sumHashSum,HashLister, andCheckSumwithdownload-if-missing