compile failure on 2.6+

[Alexandra Catalina]

Using this shell.nix, I can successfully build Ruby 2.5.x, but not 2.6.x or 2.7.x:

with import <nixpkgs> {};

let
  nixpkgsRubySource = fetchFromGitHub {
    owner = "bobvanderlinden";
    repo = "nixpkgs-ruby";
    rev = "f08653ec386876cf4942018b08301636b8e7e4f9";
    sha256 = "0xa9d1rr36xxci19sh4g0y39vjidil375lylip6b0532ms7b88vx";
  };
in
rec {
  nixpkgsRuby = import nixpkgsRubySource { inherit pkgs; };
  rubyVersion = nixpkgsRuby.mkDerivationForRubyVersion;

  rubyEnv = stdenv.mkDerivation {
    name = "rubyEnv";
    buildInputs = [ (rubyVersion ["2" "6" "2"]) ];
    installPhase = ''
      ruby --version > $out
    '';
  };
}

The error happens when it tries to build rubygems:

building '/nix/store/yvxmsrmnzw290p3b03np77z0gc06q09a-ruby-2.7.1.drv'...
unpacking sources
unpacking source archive /nix/store/sdaw5qm7g6zw3k1yd1bry4yvri4hc11s-ruby-2.7.1.tar.gz
unpacking source archive /nix/store/dskr74y0rr39jxxz51hwggdk1laa8psw-rubygems-2.7.6.tgz
source root is ruby-2.7.1
/build/ruby-2.7.1/rubygems /build
patching file lib/rubygems/dependency_installer.rb
Hunk #1 succeeded at 17 (offset 1 line).
patching file lib/rubygems/installer.rb
Hunk #1 succeeded at 791 (offset 27 lines).
patching file lib/rubygems/path_support.rb
/build
setting SOURCE_DATE_EPOCH to timestamp 1585651497 of file ruby-2.7.1/warning.rbinc
patching sources
sed: can't read configure.in: No such file or directory
builder for '/nix/store/yvxmsrmnzw290p3b03np77z0gc06q09a-ruby-2.7.1.drv' failed with exit code 2
error: build of '/nix/store/yvxmsrmnzw290p3b03np77z0gc06q09a-ruby-2.7.1.drv' failed

(full logs for 2.7.1: https://gist.github.com/dunn/a6efdadc2d92de4ea7dedbbe51760cc4)

When I set the version to 2.5.8, the automake step succeeds:

source root is ruby-2.5.8
/build/ruby-2.5.8/rubygems /build
patching file lib/rubygems/dependency_installer.rb
Hunk #1 succeeded at 17 (offset 1 line).
patching file lib/rubygems/installer.rb
Hunk #1 succeeded at 791 (offset 27 lines).
patching file lib/rubygems/path_support.rb
/build
setting SOURCE_DATE_EPOCH to timestamp 1585656958 of file ruby-2.5.8/vmtc.inc
patching sources
autoreconfPhase
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /nix/store/f85bcv4kdmknxwpi175vnfmrr0f4xvgs-autoconf-2.69/bin/autoconf --force
autoreconf: configure.ac: not using Autoheader
autoreconf: configure.ac: not using Automake
autoreconf: Leaving directory `.'
[...]

[Bob van der Linden]

Since #23, all Ruby versions are now build and tested by CI. This includes 2.5.0, 2.6.x and 2.7.x. The builds that are failing are explicitly marked as broken now. You can see these versions here:

nixpkgs-ruby/ruby/overrides.nix

Lines 10 to 23 in 12d991d

 "1" 
 "2.0" 
 "2.1.0-preview1" 
 "2.1.0-preview2" 
 "2.1.0-rc1" 
 "2.2.0" 
 "2.2.10" 
 "2.3.0" 
 "2.3.2" 
 "2.3.3" 
 "2.4.0-preview1" 
 "2.4.8" 
 "2.5.2" 
 "2.5.8" 

There might be various reasons why the build broke. I haven't looked too deeply into the cause of the build failure of these versions, but it makes sense to only look into it if anyone actually needs such a version.

Does this work for you?

[Alexandra Catalina]

I'm not currently using Nix, so unfortunately I can't test a fix.

[Bob van der Linden]

I think this is resolved. I was able to build and run 2.6.2 using:

$ nix run .#'"ruby-2.6.2"' -- -e 'puts RUBY_VERSION'
2.6.2