cabal-install-3.0 requires --installdir option which doesn't exist in existing ~/.cabal/configs

[phadej]

% cabal new-install hlint
Resolving dependencies...
Build profile: -w ghc-8.4.4 -O1
In order, the following will be built (use -v for more details):
 - hlint-2.1.15 (lib) (requires build)
 - hlint-2.1.15 (exe:hlint) (requires build)
Starting     hlint-2.1.15 (lib)
Building     hlint-2.1.15 (lib)
Installing   hlint-2.1.15 (lib)
Completed    hlint-2.1.15 (lib)
Starting     hlint-2.1.15 (exe:hlint)
Building     hlint-2.1.15 (exe:hlint)
Installing   hlint-2.1.15 (exe:hlint)
Completed    hlint-2.1.15 (exe:hlint)
cabal: installdir is not defined. Set it in your cabal config file or use
--installdir=<path>

• it fails only at the end
• why it cannot use default if it's not specified?

[fgaz]

Did you cabal user-config update?

[phadej]

No, nothing told me to do so.

…

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On 30 Mar 2019, at 17.55, Francesco Gazzetta ***@***.***> wrote: Did you cabal user-config update? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[mouse07410]

Did you cabal user-config update?

No, nothing told me to do so.

Worse than that - there's no mentioning of the config parameter installdir in the Cabal documentation. The only way to (presumably) add it correctly is to run the above command.

[drewboardman]

I just experienced the same issue, and ran cabal user-config update. This created a backup of the 2.4.1 config and replaced it with a 3.0.0 config. If someone could explain how to set the --installdir correctly - I wouldn't mind submitting a PR to update the documentation.

[sprajagopal]

Had the same issue with ghc 8.6.5 and cabal -3.1.0. After searching a while, I found this issue.

[drewboardman]

Had the same issue with ghc 8.6.5 and cabal -3.1.0. After searching a while, I found this issue.

Are you on Arch by any chance? And did you edit your ~/.cabal/config file based on that arch wiki? I updated the wiki yesterday with more info.

[ulysses4ever]

I have the very same confusing behavior with cabal-install 3.0.1 and GHC 8.8.2. It would be nice to fix it somehow (e.g. initialize installdir without explicit cabal user-config update).

[tomsmeding]

Alternatively, it could be nice if cabal at least informs the user that cabal user-config update might be in order. Currently, the only way I know of getting this information is this issue, which is a bit scarce...