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make --json-error-messages capture url download errors

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Convert Utility.Url to return Either String so the error message can be
displated in the annex monad and so captured.

(When curl is used, its errors are still not caught.)
This commit is contained in:
Joey Hess 2019-11-12 13:33:41 -04:00
parent 99536e3a0b
commit 890330f0fe
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16 changed files with 161 additions and 121 deletions
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doc/bugs/error_message_in_addurl_is_not_channeled_into_json_record_with_--json-error-messages.mdwn
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@ -22,3 +22,8 @@ If user convenience was something to strive for here, it should technically be p
[[!meta author=yoh]]
[[!tag projects/datalad]]
> [[fixed|done]], and I also converted a number of other places
> where an error could leak through to stderr, although there are still
> some places where direct writes to stderr happen -- I'll probably never
> be able to guarantee --json-error-messages catches every possible stderr
> output. --[[Joey]]