calibre-web: options.enableBookConversion fails due to missing 'calibredb'

[mksafavi]

Nixpkgs version

• Unstable (25.05)

Describe the bug

Book conversion fails with the following error:

ERROR {cps.tasks.convert:210} Ebook-converter failed: [Errno 2] No such file or directory: 'calibredb'

Steps to reproduce

• Enable calibre-web

  services.calibre-web = {
    enable = true;
    options = {
      enableBookConversion = true;
    };

  };

• Choose a book, open Edit metadata menu

• Try to convert it to another format.

Book successfully queued for converting to PDF

• On the Tasks page the job status is failed:

User	Task	Status	Progress	Run Time	Start Time	Actions
admin	Convert: EPUB -> PDF: The Twelve-Factor App	Failed	100 %	0s	3/21/25, 3:55 AM

• check journalctl -u calibre-web.service logs

Expected behaviour

successfully convert the book

Screenshots

No response

Relevant log output

Mar 21 03:55:48 t70 calibre-web[31407]: [2025-03-21 03:55:48,322]  INFO {cps.editbooks:320} converting: book id: 27 from: EPUB to: PDF
Mar 21 03:55:48 t70 calibre-web[31407]: [2025-03-21 03:55:48,334]  INFO {cps.tasks.convert:159} Book id 27 - target format of .pdf does not exist. Moving forward with convert.
Mar 21 03:55:48 t70 calibre-web[31407]: [2025-03-21 03:55:48,351]  INFO {cps.tasks.convert:206} ebook converter failed with error while converting book
Mar 21 03:55:48 t70 calibre-web[31407]: [2025-03-21 03:55:48,352] ERROR {cps.tasks.convert:210} Ebook-converter failed: [Errno 2] No such file or directory: 'calibredb'

Additional context

I also tried adding the calibre package to environment and systemd packages but it didn't fix the issue:

  environment.systemPackages = [
    pkgs.calibre
    pkgs.calibre-web
  ];

  systemd.packages = [
    pkgs.calibre
    pkgs.calibre-web
  ];

System metadata

• system: "x86_64-linux"
• host os: Linux 6.13.6, NixOS, 25.05 (Warbler), 25.05.20250313.6607cf7
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.25.5
• nixpkgs: /nix/store/sznkl4iwqvxprlg05fx24xx8bd8j7y6l-source

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@pborzenkov

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[mksafavi]

There's an open PR for this issue: #366642

[mfenniak]

As #366642 is merged, I believe this issue can be closed.