diff options
| author | danbst <abcz2.uprola@gmail.com> | 2019-06-05 02:50:49 +0300 |
|---|---|---|
| committer | danbst <abcz2.uprola@gmail.com> | 2019-06-05 03:10:57 +0300 |
| commit | bfb6ef1d59338e07f94f395cc56c98c116987c3d (patch) | |
| tree | dfa3edd51732297eb11d201617ebf31f73231e37 /lib | |
| parent | e380ef398761206954e51426d16a328eaba27fce (diff) | |
module system: prettify a bit error when unique option defined twice
The error can be reproduced like:
```
$ nix-instantiate ./nixos -A system --arg configuration '
{ fileSystems."/".device = "nodev";
boot.loader.grub.devices = [ "nodev" ];
containers.t.config.imports = [ <nixpkgs/nixos/modules/virtualisation/amazon-image.nix> ];
}'
```
Previously error was:
```
error: The unique option `containers.t.networking.hostName' is defined multiple times, in `/nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/virtualisation/amazon-image.nix' and `module at /home/danbst/dev/nixpkgs/nixos/modules/virtualisation/containers.nix:470'.
(use '--show-trace' to show detailed location information)
```
Now it is:
```
error: The unique option `containers.t.networking.hostName' is defined multiple times, in:
- /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos/modules/virtualisation/amazon-image.nix
- module at /home/danbst/dev/nixpkgs/nixos/modules/virtualisation/containers.nix:470.
(use '--show-trace' to show detailed location information)
```
Related: https://github.com/NixOS/nixpkgs/issues/15747
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/options.nix | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/options.nix b/lib/options.nix index a16a980398d6..d2eae3ae3a98 100644 --- a/lib/options.nix +++ b/lib/options.nix @@ -101,7 +101,7 @@ rec { mergeOneOption = loc: defs: if defs == [] then abort "This case should never happen." else if length defs != 1 then - throw "The unique option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}." + throw "The unique option `${showOption loc}' is defined multiple times, in:\n - ${concatStringsSep "\n - " (getFiles defs)}." else (head defs).value; /* "Merge" option definitions by checking that they all have the same value. */ |