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lib.warn: Add NIX_ABORT_ON_WARN for call traces

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This commit is contained in:
Robert Hensing 2021-08-25 18:35:16 +02:00
parent cc3b147ed1
commit c9b7cc79e6
1 changed files with 20 additions and 1 deletions
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21
lib/trivial.nix
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@ -303,7 +303,26 @@ rec {
# TODO: figure out a clever way to integrate location information from
# something like __unsafeGetAttrPos.
warn = msg: builtins.trace "warning: ${msg}";
/*
Print a warning before returning the second argument. This function behaves
like `builtins.trace`, but requires a string message and formats it as a
warning, including the `warning: ` prefix.
To get a call stack trace and abort evaluation, set the environment variable
`NIX_ABORT_ON_WARN=true` and set the Nix options `--option pure-eval false --show-trace`
Type: string -> a -> a
*/
warn =
if lib.elem (builtins.getEnv "NIX_ABORT_ON_WARN") ["1" "true" "yes"]
then msg: builtins.trace "warning: ${msg}" (abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors.")
else msg: builtins.trace "warning: ${msg}";
/*
Like warn, but only warn when the first argument is `true`.
Type: bool -> string -> a -> a
*/
warnIf = cond: msg: if cond then warn msg else id;
info = msg: builtins.trace "INFO: ${msg}";