Nixpkgs: zathura: cannot open links

[jlesquembre]

Describe the bug
After my last nixos update (I'm on nixos-unstable) I cannot open hyperlinks anymore with zathura, I get this error on the console:

xdg-open: no method available for opening 'http://www.amazon.com/'

To Reproduce
Steps to reproduce the behavior:

1. Open a pdf with an hyperlink, e.g.: https://www.southcentralric.org/Downloads/Dos%20and%20Donts%20of%20ADA%20Compliant%20Hyperlinks.pdf
2. Try to open the link (press f and then 1)
3. Nothing happens and there are some errors on the console

Additional context
Some months ago, I fixed the same issue on this PR:
https://github.com/NixOS/nixpkgs/pull/57291
but this time looks like the issue is cause for other reason and I don't know how to fix it

Metadata
Please run nix run nixpkgs.nix-info -c nix-info -m and paste the result.

 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.78, NixOS, 20.03.git.94500c9 (Markhor)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.1`
 - channels(root): `"nixos-16.09.1787.e1874d0"`
 - nixpkgs: `/etc/nixos/nixpkgs`

[rnhmjoj]

Does executing xdg-open directly work?

[jlesquembre]

@rnhmjoj yes, executing xdg-open 'https://www.amazon.com' from the terminal works

[rnhmjoj]

I tried building zathura from nixpkgs master and running it (from 19.09) and it works.
It does so even when BROWSER is unset. This probably means it's either an issue in a recent version of xdg-open or something else in your setup but zathura looks fine.

[jlesquembre]

@rnhmjoj thanks a lot for testing, but I'm still getting the same issue.
There is something that works for me, I uncommented this line:

https://github.com/NixOS/nixpkgs/blob/d0d5884ba5695c16bae169598a792d93b2f67bc5/pkgs/applications/misc/zathura/core/default.nix#L27

and set it to disable, and now I can open the links. I don't understand why we get different results. I'm also using nixpkgs master.

[jlesquembre]

@rnhmjoj I think I know why, do you have

set sandbox none

in your zathurarc?

[rnhmjoj]

@rnhmjoj I think I know why, do you have [...] in your zathurarc?

No, sorry, I do not.

I've just built a NixOS VM and run zathura (so default config) in it: still works as expected.
If I were you I'd try to reproduce the bug by either stripping down your setup or by builting it gradually in a VM.

[jlesquembre]

@rnhmjoj thanks for your help, since looks like the problem is something with my configuration, I'm closing this issue.
For reference, in case someone else finds the same issue, set sandbox none has fixed it for me