"DBIx::Class::Schema" is empty.

[tbenst]

When I call hydra-init, I get the following error:

Base class package "DBIx::Class::Schema" is empty.
    (Perhaps you need to 'use' the module which defines that package first,
    or make that module available in @INC (@INC contains: /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl/5.30.0/x86_64-linux-thread-multi /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl/5.30.0 /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0/x86_64-linux-thread-multi /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0 /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl/5.30.0/x86_64-linux-thread-multi /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl/5.30.0 /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydra-perl-deps/lib/perl5/site_perl /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0/x86_64-linux-thread-multi /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0 /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0/x86_64-linux-thread-multi /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/site_perl/5.30.0 /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/5.30.0/x86_64-linux-thread-multi /nix/store/3adfpfcpcf8vwm3ncsg5h4dlki7xkmsb-perl-5.30.0/lib/perl5/5.30.0).
 at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib/Hydra/Schema.pm line 10.
BEGIN failed--compilation aborted at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib/Hydra/Schema.pm line 10.
Compilation failed in require at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/bin/.hydra-init-wrapped line 4.
BEGIN failed--compilation aborted at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/bin/.hydra-init-wrapped line 4.

A fully reproducible version of the error is here: https://github.com/ElvishJerricco/simple-hydra. On startup of hydra-init.service, I get the following error:

Dec 10 01:50:27 hydra-server systemd[1]: Starting hydra-init.service...
Dec 10 01:50:27 hydra-server sudo[2715]:     root : TTY=unknown ; PWD=/ ; USER=postgres ; COMMAND=/nix/store/46xc51hfqc493zbd4kr2abw07h19y0zd-postgresql-11.6/bin/createuser hydra
Dec 10 01:50:27 hydra-server sudo[2715]: pam_unix(sudo:session): session opened for user postgres by (uid=0)
Dec 10 01:50:27 hydra-server sudo[2715]: pam_unix(sudo:session): session closed for user postgres
Dec 10 01:50:27 hydra-server sudo[2718]:     root : TTY=unknown ; PWD=/ ; USER=postgres ; COMMAND=/nix/store/46xc51hfqc493zbd4kr2abw07h19y0zd-postgresql-11.6/bin/createdb -O hydra hydra
Dec 10 01:50:27 hydra-server sudo[2718]: pam_unix(sudo:session): session opened for user postgres by (uid=0)
Dec 10 01:50:27 hydra-server sudo[2718]: pam_unix(sudo:session): session closed for user postgres
Dec 10 01:50:27 hydra-server sudo[2723]:     root : TTY=unknown ; PWD=/ ; USER=postgres ; COMMAND=/nix/store/46xc51hfqc493zbd4kr2abw07h19y0zd-postgresql-11.6/bin/psql hydra
Dec 10 01:50:27 hydra-server sudo[2723]: pam_unix(sudo:session): session opened for user postgres by (uid=0)
Dec 10 01:50:27 hydra-server qgd2f34hvxlfpry9z9mqjx2ygbpwky7f-unit-script-hydra-init-pre-start[2703]: CREATE EXTENSION
Dec 10 01:50:27 hydra-server sudo[2723]: pam_unix(sudo:session): session closed for user postgres
Dec 10 01:50:27 hydra-server hydra-init[2729]: Base class package "DBIx::Class::Schema" is empty.
Dec 10 01:50:27 hydra-server hydra-init[2729]:     (Perhaps you need to 'use' the module which defines that package first,
Dec 10 01:50:27 hydra-server hydra-init[2729]:     or make that module available in @INC (@INC contains: /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib /nix/store/82byfimpw49vlwrzwg0zcpk0s06g4hk3-hydr>
Dec 10 01:50:27 hydra-server hydra-init[2729]:  at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib/Hydra/Schema.pm line 10.
Dec 10 01:50:27 hydra-server hydra-init[2729]: BEGIN failed--compilation aborted at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/libexec/hydra/lib/Hydra/Schema.pm line 10.
Dec 10 01:50:27 hydra-server hydra-init[2729]: Compilation failed in require at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/bin/.hydra-init-wrapped line 4.
Dec 10 01:50:27 hydra-server hydra-init[2729]: BEGIN failed--compilation aborted at /nix/store/xky44md2ixi021xphjh81zc83qjiqjdx-hydra-2019-08-30/bin/.hydra-init-wrapped line 4.
Dec 10 01:50:27 hydra-server systemd[1]: hydra-init.service: Main process exited, code=exited, status=255/EXCEPTION
Dec 10 01:50:27 hydra-server systemd[1]: hydra-init.service: Failed with result 'exit-code'.
Dec 10 01:50:27 hydra-server systemd[1]: Failed to start hydra-init.service.

I tried adding the following with no luck:

    services.postgresql = {
      enable = true;
      package = pkgs.postgresql;
      ensureDatabases = [ "hydra" ];
      ensureUsers = [
        {
          name = "hydra";
          ensurePermissions = {
            "DATABASE hydra" = "ALL PRIVILEGES";
          };
        }
      ];
    };

Adding the ~/.pgpass file from Installation section of manual made no difference either.

[duairc]

I'm pretty sure this is nixpkgs#72783. It should be fixed in the latest nixpkgs master.

[tbenst]

@duairc thanks! did you mean to link another issue? Self-referencial tautology ;)

[duairc]

I fixed the link! If it's the issue I think it is it was fixed by this PR. It's in nixpkgs master but hasn't yet made it into nixos-unstable.