diff options
author | Robert Hensing <robert@roberthensing.nl> | 2021-08-25 18:35:16 +0200 |
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committer | Robert Hensing <robert@roberthensing.nl> | 2021-10-13 22:43:06 +0200 |
commit | c9b7cc79e6ce6b38debb28ab0d06051a4fb5b336 (patch) | |
tree | d5c9357f4e77edf293581f337d8f2acde0069702 /lib/trivial.nix | |
parent | cc3b147ed182a6cae239348ef094158815da14ae (diff) |
lib.warn: Add NIX_ABORT_ON_WARN for call traces
Diffstat (limited to 'lib/trivial.nix')
-rw-r--r-- | lib/trivial.nix | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/trivial.nix b/lib/trivial.nix index 7956ba4bde6f..a389c7cdfacb 100644 --- a/lib/trivial.nix +++ b/lib/trivial.nix @@ -303,7 +303,26 @@ rec { # TODO: figure out a clever way to integrate location information from # something like __unsafeGetAttrPos. - warn = msg: builtins.trace "[1;31mwarning: ${msg}[0m"; + /* + 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 "[1;31mwarning: ${msg}[0m" (abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors.") + else msg: builtins.trace "[1;31mwarning: ${msg}[0m"; + + /* + 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}"; |