diff options
| -rw-r--r-- | lib/sources.nix | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/sources.nix b/lib/sources.nix index 407f9d21b8b..407829b547b 100644 --- a/lib/sources.nix +++ b/lib/sources.nix @@ -12,6 +12,7 @@ let tryEval ; inherit (lib) + boolToString filter getAttr isString @@ -90,6 +91,29 @@ let name = if name != null then name else orig.name; }; + /* + Add logging to a source, for troubleshooting the filtering behavior. + Type: + sources.trace :: sourceLike -> Source + */ + trace = + # Source to debug. The returned source will behave like this source, but also log its filter invocations. + src: + let + attrs = toSourceAttributes src; + in + fromSourceAttributes ( + attrs // { + filter = path: type: + let + r = attrs.filter path type; + in + builtins.trace "${attrs.name}.filter ${path} = ${boolToString r}" r; + } + ) // { + satisfiesSubpathInvariant = src ? satisfiesSubpathInvariant && src.satisfiesSubpathInvariant; + }; + # Filter sources by a list of regular expressions. # # E.g. `src = sourceByRegex ./my-subproject [".*\.py$" "^database.sql$"]` @@ -233,5 +257,7 @@ in { sourceByRegex sourceFilesBySuffices + + trace ; } |