14bf54bd39
Turns errors like:
let
somepkg.src = throw "invalid foobar";
in somepkg.src.meta
error:
… while evaluating the attribute 'src.meta'
at «string»:2:3:
1| let
2| somepkg.src = throw "invalid foobar";
| ^
3| in somepkg.src.meta
… while calling the 'throw' builtin
at «string»:2:17:
1| let
2| somepkg.src = throw "invalid foobar";
| ^
3| in somepkg.src.meta
error: invalid foobar
into errors like:
let
somepkg.src = throw "invalid foobar";
in somepkg.src.meta
error:
… while evaluating the attribute 'src.meta'
at «string»:2:3:
1| let
2| somepkg.src = throw "invalid foobar";
| ^
3| in somepkg.src.meta
… while evaluating 'somepkg.src' to select 'meta' on it
at «string»:3:4:
2| somepkg.src = throw "invalid foobar";
3| in somepkg.src.meta
| ^
… while calling the 'throw' builtin
at «string»:2:17:
1| let
2| somepkg.src = throw "invalid foobar";
| ^
3| in somepkg.src.meta
error: invalid foobar
And for type errors, from:
let
somepkg.src = "I'm not an attrset";
in somepkg.src.meta
error:
… while evaluating the attribute 'src.meta'
at «string»:2:3:
1| let
2| somepkg.src = "I'm not an attrset";
| ^
3| in somepkg.src.meta
… while selecting an attribute
at «string»:3:4:
2| somepkg.src = "I'm not an attrset";
3| in somepkg.src.meta
| ^
error: expected a set but found a string: "I'm not an attrset"
into:
let
somepkg.src = "I'm not an attrset";
in somepkg.src.meta
error:
… while evaluating the attribute 'src.meta'
at «string»:2:3:
1| let
2| somepkg.src = "I'm not an attrset";
| ^
3| in somepkg.src.meta
… while selecting 'meta' on 'somepkg.src'
at «string»:3:4:
2| somepkg.src = "I'm not an attrset";
3| in somepkg.src.meta
| ^
error: expected a set but found a string: "I'm not an attrset"
For the low price of an enumerate() and a lambda you too can have the
incorrect line of code actually show up in the trace!
Change-Id: Ic1491c86e33c167891bdac9adad6224784760bd6
4.4 KiB
4.4 KiB
| synopsis | cls | credits | category |
|---|---|---|---|
| Trace which part of a `foo.bar.baz` expression errors | 1505, 1506 | Qyriad | Improvements |
Previously, if an attribute path selection expression like linux_4_9.meta.description it wouldn't show you which one of those parts in the attribute path, or even that that line of code is what caused evaluation of the failing expression.
The previous error looks like this:
pkgs.linuxKernel.kernels.linux_4_9.meta.description
error:
… while evaluating the attribute 'linuxKernel.kernels.linux_4_9.meta.description'
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:5:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
… while calling the 'throw' builtin
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:17:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
error: linux 4.9 was removed because it will reach its end of life within 22.11
Now, the error will look like this:
pkgs.linuxKernel.kernels.linux_4_9.meta.description
error:
… while evaluating the attribute 'linuxKernel.kernels.linux_4_9.meta.description'
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:5:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
… while evaluating 'pkgs.linuxKernel.kernels.linux_4_9' to select 'meta' on it
at «string»:1:1:
1| pkgs.linuxKernel.kernels.linux_4_9.meta.description
| ^
… caused by explicit throw
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:17:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
error: linux 4.9 was removed because it will reach its end of life within 22.11
Not only does the line of code that referenced the failing attribute show up in the trace, it also tells you that it was specifically the linux_4_9 part that failed.
This includes if the failing part is a top-level binding:
let
inherit (pkgs.linuxKernel.kernels) linux_4_9;
in linux_4_9.meta.description
error:
… while evaluating 'linux_4_9' to select 'meta.description' on it
at «string»:3:4:
2| inherit (pkgs.linuxKernel.kernels) linux_4_9;
3| in linux_4_9.meta.description
| ^
… while evaluating the attribute 'linux_4_9'
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:5:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
… caused by explicit throw
at /nix/store/dk2rpyb6ndvfbf19bkb2plcz5y3k8i5v-source/pkgs/top-level/linux-kernels.nix:278:17:
277| } // lib.optionalAttrs config.allowAliases {
278| linux_4_9 = throw "linux 4.9 was removed because it will reach its end of life within 22.11";
| ^
279| linux_4_14 = throw "linux 4.14 was removed because it will reach its end of life within 23.11";
error: linux 4.9 was removed because it will reach its end of life within 22.11