Cabal woes
Simon Peyton Jones
simonpj at microsoft.com
Mon Apr 15 22:44:32 UTC 2019
Simon has a cabal-install that claims to be 3.0.0.0
Ah yes, I installed it thus:
· sudo add-apt-repository ppa:hvr/ghc-wsl
· sudo apt-get update
· sudo apt install cabal-install-3.0
Why did I do that? Because earlier versions of cabal crashed with a mysterious “The futex facility returned an unexpected” something like this https://github.com/Microsoft/WSL/issues/3881 or this https://github.com/reflex-frp/reflex-platform/issues/293
Apparently Herbert’s 3.0 does not fail in this way.
Simon
From: ghc-devs <ghc-devs-bounces at haskell.org> On Behalf Of Brandon Allbery
Sent: 15 April 2019 23:24
To: Oleg Grenrus <oleg.grenrus at iki.fi>
Cc: ghc-devs at haskell.org Devs <ghc-devs at haskell.org>
Subject: Re: Cabal woes
The facts here are in the original message: Simon has a cabal-install that claims to be 3.0.0.0, and is treating "install" as "v2-install". So evidently *someone* has released it in some fashion, perhaps inappropriately.
On Mon, Apr 15, 2019 at 6:22 PM Oleg Grenrus <oleg.grenrus at iki.fi<mailto:oleg.grenrus at iki.fi>> wrote:
cabal-install-3 isn't released. Please check the facts.
- Oleg
On 16.4.2019 1.17, Brandon Allbery wrote:
I vaguely recall seeing that bug come up with respect to v2-install. And in fact am a bit surprised that 3 has been released, since this is highlighting that neither it nor the Haskell ecosystem is quite ready for it.
I'd also have expected (and thought I'd seen) "cabal install" in recent 2.x warn that it would be "v1-install" in the future.
On Mon, Apr 15, 2019 at 6:13 PM Simon Peyton Jones <simonpj at microsoft.com<mailto:simonpj at microsoft.com>> wrote:
Aha! That works. I would never in a million years have found that by myself. Thank you.
But
* It is terribly mysterious that “cabal install hspec” doesn’t, well, install hspec.
* It must surely be a bug that “cabal install –lib hspec” simply crashes.
Simon
From: Brandon Allbery <allbery.b at gmail.com<mailto:allbery.b at gmail.com>>
Sent: 15 April 2019 23:03
To: Simon Peyton Jones <simonpj at microsoft.com<mailto:simonpj at microsoft.com>>
Cc: ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>
Subject: Re: Cabal woes
Yes, I think a lot of documentation will need to be updated because this. You want "cabal v1-install" with cabal 3.
On Mon, Apr 15, 2019 at 6:00 PM Simon Peyton Jones <simonpj at microsoft.com<mailto:simonpj at microsoft.com>> wrote:
Thanks. But alas I have no clue about whether I want a v1-install or a v2-install, nor how to achieve them if I knew what they were. I just want to install ‘hspec’ so that I can use it when compiling a program. How would I do that?
The instructions here https://wiki.haskell.org/Cabal-Install<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal-Install&data=02%7C01%7Csimonpj%40microsoft.com%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=pJb05mqT1A0ceYxJ26%2FkMhJCYQ9S7%2Bupn89xZSl7y2I%3D&reserved=0> just say “cabal install hspec” which is what I tried. Those instructions are pointed to from here https://wiki.haskell.org/Cabal/How_to_install_a_Cabal_package<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.haskell.org%2FCabal%2FHow_to_install_a_Cabal_package&data=02%7C01%7Csimonpj%40microsoft.com%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=mBDZQXgEtvQLuiTCFCKLtREPmImnr3ljNTHq%2B4A4Nf4%3D&reserved=0>, which in turn are pointed to from the main Cabal home page https://www.haskell.org/cabal/<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.haskell.org%2Fcabal%2F&data=02%7C01%7Csimonpj%40microsoft.com%7C2fdeabc1bf0049584e9708d6c1f11cb5%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636909638652533306&sdata=scKnLWjyw1X5N1VPpBukOq4PXDoeHcYTXa3gT5bKK7E%3D&reserved=0>.
I must be missing something.
Simon
From: Brandon Allbery <allbery.b at gmail.com<mailto:allbery.b at gmail.com>>
Sent: 15 April 2019 22:54
To: Simon Peyton Jones <simonpj at microsoft.com<mailto:simonpj at microsoft.com>>
Cc: ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>
Subject: Re: Cabal woes
I think you wanted v1-install to install a library into the user package database, since your cabal is 3.x and the v2-* commands are now the default (that is, you did what used to be cabal new-install or cabal v2-install).
On Mon, Apr 15, 2019 at 5:47 PM Simon Peyton Jones via ghc-devs <ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>> wrote:
I’m trying to install ‘hspec’ on my WSL (Windows subsystem for Linux) system.
But I fail; see below.
For some reason cabal complains about installing a library. (That seems peculiar – isn’t that what cabal is for?) But it helpfully suggests adding –lib.
Alas, cabal then crashes outright, which should never happen.
So I’m stuck. What should I do?
Thanks
Simon
simonpj at MSRC-9870733:~$ cabal --version
cabal-install version 3.0.0.0
compiled using version 3.0.0.0 of the Cabal library
simonpj at MSRC-9870733:~$ cabal install hspec
Resolving dependencies...
Up to date
Warning: You asked to install executables, but there are no executables in
target: hspec. Perhaps you want to use --lib to install libraries instead.
simonpj at MSRC-9870733:~$ cabal install --lib hspec
Resolving dependencies...
Up to date
Distribution/Simple/GHC.hs:1959:5-56: Irrefutable pattern failed for pattern Just ghcPkgProg
simonpj at MSRC-9870733:~$ which ghc
/opt/ghc/bin/ghc
simonpj at MSRC-9870733:~$ which ghc-pkg
/opt/ghc/bin/ghc-pkg
simonpj at MSRC-9870733:~$
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brandon s allbery kf8nh
allbery.b at gmail.com<mailto:allbery.b at gmail.com>
--
brandon s allbery kf8nh
allbery.b at gmail.com<mailto:allbery.b at gmail.com>
--
brandon s allbery kf8nh
allbery.b at gmail.com<mailto:allbery.b at gmail.com>
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