[MacPorts] #37667: port lint should complain about using only md5 or sha1 checksums

[MacPorts]

#37667: port lint should complain about using only md5 or sha1 checksums
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 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:  MacPorts Future
Component:  base          |    Version:
 Keywords:                |       Port:
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 `port lint` should issue a warning if any distfile or patchfile is listed
 with only an md5 or sha1 checksum, since md5 is a broken algorithm and
 sha1 is also kind of old by now. The warning message should encourage
 portfile authors to use both rmd160 and sha256 checksums on each file,
 like we show in the guide.

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Ticket URL: <https://trac.macports.org/ticket/37667>
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