hnix doesn't build on nixos-unstable

[pmiddend]

Describe the bug

nix-shell -p haskellPackages.hnix

results in

copying path '/nix/store/cgwj1yggbds25slahdjklc8lh0kfbl7i-haskell-src-meta-0.8.5' from 'https://cache.nixos.org'...
building '/nix/store/zf9kvw36yn5z9sl491l3fc2bjbrxv7zx-regex-tdfa-text-1.0.0.3.drv'...
building '/nix/store/qhbc5q28szp95d5bvamnx4z3lzhlvbj3-these-0.7.6.drv'...
copying path '/nix/store/07mrkw1hw8yr9vi7yhnqzfpaihvb8m6s-tasty-hspec-1.1.5.1' from 'https://cache.nixos.org'...
setupCompilerEnvironmentPhase
Build with /nix/store/34mx8khxgbf4nhi3lqsbysq5w38pbfbd-ghc-8.8.2.
unpacking sources
unpacking source archive /nix/store/zqwk4fb0ycr8s8jbwzwawclj1q9cha3x-regex-tdfa-text-1.0.0.3.tar.gz
source root is regex-tdfa-text-1.0.0.3
setting SOURCE_DATE_EPOCH to timestamp 1440421992 of file regex-tdfa-text-1.0.0.3/Text/Regex/TDFA/Text/Lazy.hs
patching sources
Replace Cabal file with edited version from mirror://hackage/regex-tdfa-text-1.0.0.3/revision/1.cabal.
compileBuildDriverPhase
setupCompileFlags: -package-db=/build/setup-package.conf.d -j4 -threaded
[1 of 1] Compiling Main             ( Setup.lhs, /build/Main.o )
setupCompilerEnvironmentPhase
Build with /nix/store/34mx8khxgbf4nhi3lqsbysq5w38pbfbd-ghc-8.8.2.
Linking Setup ...
copying path '/nix/store/1flg5rfxjrr1slg4878vijvn9fpqhzvf-interpolate-0.2.0' from 'https://cache.nixos.org'...
unpacking sources
unpacking source archive /nix/store/ql1vm9zx9zh9kcc77rfdr36a3xh73hww-these-0.7.6.tar.gz
source root is these-0.7.6
setting SOURCE_DATE_EPOCH to timestamp 1000000000 of file these-0.7.6/these.cabal
patching sources
Run jailbreak-cabal to lift version restrictions on build inputs.
compileBuildDriverPhase
setupCompileFlags: -package-db=/build/setup-package.conf.d -j4 -threaded
[1 of 1] Compiling Main             ( Setup.hs, /build/Main.o )
Linking Setup ...
configuring
configureFlags: --verbose --prefix=/nix/store/rbpsxlm082dpiv8r39fl1ac5zq1yb767-regex-tdfa-text-1.0.0.3 --libdir=$prefix/lib/$compiler --libsubdir=$abi/$libname --docdir=/nix/store/chfppam99a9amy7r4ziazdi18v89h8iw-regex-tdfa-text-1.0.0.3-doc/share/doc/regex-tdfa-text-1.0.0.3 --with-gcc=gcc --package-db=/build/package.conf.d --ghc-option=-j4 --disable-split-objs --enable-library-profiling --profiling-detail=exported-functions --disable-profiling --enable-shared --disable-coverage --enable-static --disable-executable-dynamic --enable-tests --disable-benchmarks --enable-library-vanilla --disable-library-for-ghci --ghc-option=-split-sections --extra-lib-dirs=/nix/store/wxwzrhjxpzznkxky64965af43l98bjji-ncurses-6.1-20190112/lib --extra-lib-dirs=/nix/store/bxqxy5lnj6cp3lmfw1j0q42ss3b8zgaj-libffi-3.3/lib --extra-lib-dirs=/nix/store/llkj5hw3mnv67cqc69hxysngr74a524g-gmp-6.2.0/lib
Using Parsec parser
Configuring regex-tdfa-text-1.0.0.3...
CallStack (from HasCallStack):
  die', called at libraries/Cabal/Cabal/Distribution/Simple/Configure.hs:1022:20 in Cabal-3.0.1.0:Distribution.Simple.Configure
  configureFinalizedPackage, called at libraries/Cabal/Cabal/Distribution/Simple/Configure.hs:475:12 in Cabal-3.0.1.0:Distribution.Simple.Configure
  configure, called at libraries/Cabal/Cabal/Distribution/Simple.hs:625:20 in Cabal-3.0.1.0:Distribution.Simple
  confHook, called at libraries/Cabal/Cabal/Distribution/Simple/UserHooks.hs:65:5 in Cabal-3.0.1.0:Distribution.Simple.UserHooks
  configureAction, called at libraries/Cabal/Cabal/Distribution/Simple.hs:180:19 in Cabal-3.0.1.0:Distribution.Simple
  defaultMainHelper, called at libraries/Cabal/Cabal/Distribution/Simple.hs:116:27 in Cabal-3.0.1.0:Distribution.Simple
  defaultMain, called at Setup.lhs:3:10 in main:Main
Setup: Encountered missing or private dependencies:
regex-base <0.94

builder for '/nix/store/zf9kvw36yn5z9sl491l3fc2bjbrxv7zx-regex-tdfa-text-1.0.0.3.drv' failed with exit code 1
cannot build derivation '/nix/store/wrwqp82q7azdsh6kn8x7r0abl1a4sz58-hnix-0.6.1.drv': 1 dependencies couldn't be built
error: build of '/nix/store/wrwqp82q7azdsh6kn8x7r0abl1a4sz58-hnix-0.6.1.drv' failed

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.23, NixOS, 20.09pre215947.82b54d49066 (Nightingale)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.3
• channels(philipp): ""
• channels(root): ""
• nixpkgs: /nix/store/w8s6mcva9z073fqf6v1jmj6dhjjl0w5f-source

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:

[cdepillabout]

@pmiddend Thanks for reporting this.

We'd appreciate a PR fixing this, although it might be easiest just to get upstream to release a version that supports a newer regex-base.

Also, getting hnix in Stackage would help prevent this problem in the future.

[flokli]

At latest zurihac, I tried to take a look getting this into stackage with @sboehler - see haskell-nix/hnix#494 and haskell-nix/hnix#504.

TLDR: we need to get a pure haskell hashing library into stackage first, as cryptonite is a no-no (due to GHCJS).

[cdepillabout]

@flokli if you're interested in getting hnix into Stackage, you can probably just send a PR to Stackage adding libraries like hashing, monadlist, and ref-tf.

As long as those libraries already build in stackage nightly, this is normally a pretty easy process.

If those libraries don't already build in Stackage nightly, you'll have to send PRs updating them, and then get the maintainer to make a release to Hackage.

[pmiddend]

I'm all for fixing this properly, but is there any way to fix this purely in nixpkgs? For now, I mean.

[flokli]

I'm probably not the right person to do this. I don't use hnix, and am not that involved in the Haskell ecosystem either.

[cdepillabout]

@pmiddend From the error message, it appears that regex-tdfa-text depends on an older version of regex-base.

There are a couple possible ways to fix this. Some of these may not work depending on the package:

1. Jailbreak regex-tdfa-text so it uses a later version of regex-base.
2. Get upstream to release a newer version of regex-tdfa-text so that it is compatible with the version of regex-base in nixpkgs.

[pmiddend]

Btw. with the latest nixos-unstable, I now get

Setup: Encountered missing or private dependencies:
pretty-show >=1.9.5 && <1.10

[sorki]

Feel free to use https://github.com/sorki/hnix-overlay meanwhile

[sorki]

Builds with unstable since c054bc6, unbroken in c9b67ee