openTempFile fails when the template parameter contain a path separator

If the template string contains a path separator, for example "a/b" then openTempFile just fails with a message which does not even indicate what the problem might be. It displays the following message:

mod: /tmp/: openTempFile: does not exist (No such file or directory)

It can either provide a better error message, saying that path separator is not allowed or if it is legal to allow a path separator then it should create that path in the temp dir.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/base
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changed weight to 5

added Tbug Trac import core libraries labels

I don't think we want to create any directories in openTempFile. Afterall, it would then be unclear whether the user should cleanup the parent directories or just the file.

Consequently, I think the right solution here is to simply disallow path separators in the template: if the user wants to specify a directory component then they can provide it in the first argument.

I agree, that sounds like the right solution.

mentioned in commit b04ded8f

changed milestone to %8.2.1

added 1 deleted label

closed

Merged to ghc-8.2 as 02a9c6a3.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

removed 1 deleted label

added error messages label

added Pnormal label