initial todo to add ErrorMsg to all -FAILURE responses
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ATM
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[[!format sh """
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$> grep -e -FAILURE doc/design/external_special_remote_protocol.mdwn
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* `INITREMOTE-FAILURE ErrorMsg`
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* `PREPARE-FAILURE ErrorMsg`
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* `TRANSFER-FAILURE STORE|RETRIEVE Key ErrorMsg`
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* `CHECKPRESENT-FAILURE Key`
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* `REMOVE-FAILURE Key ErrorMsg`
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* `CLAIMURL-FAILURE`
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* `CHECKURL-FAILURE`
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* `WHEREIS-FAILURE`
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"""]]
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so some commands have a way to report why action failed and some do not.
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I have been running into an error message `CHECKURL failed with no reason given` and I thought our special remote is just not letting know details but apparently I just followed the spec and thus did not provide description of the reason why CHECKURL has failed. That complicates debugging/fixing.
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Unfortunately it seems that adding such support would not be backward compatible, ie older versions of git annex would puke if external remote starts to provide error message, so I guess it would be up to the remote to check annex version (or protocol features?) on either it can report an error:
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[[!format sh """
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external special remote protocol error, unexpectedly received "CLAIMURL-FAILURE IT IS FAILURE" (unable to parse command)
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git-annex: unable to use special remote due to protocol error
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$> git annex version
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git-annex version: 8.20200810+git143-gdee38c54d-1~ndall+1
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"""]]
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[[!meta author=yoh]]
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[[!tag projects/datalad]]
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