During declarative recipe loading filter out duplicate copies of singleton recipes.#7468
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During declarative recipe loading filter out duplicate copies of singleton recipes.#7468
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…leton recipes. I had proposed something very similar to this before, here: #6560 That didn't get merged because it felt too magical / special case for DeclarativeRecipe to deduplicate as a silent implementation detail. Instead of doing this the first time we decided on creating Singleton. But with Singleton alone I cannot find a way to guard the scanning phase without breaking ScanningRecipe.generate(). I tried several things. But a common usage for scanning recipes is to verify whether a file already exists, if I skip those then generate() recipes will create files they shouldn't because their scanner was skipped by Singleton. So I'm resurrecting the declarative recipe duplicate loading skip. But this time I'm keying off the presence of Singleton, which explicitly opts-in a recipe to desiring this behavior.
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I had proposed something very similar to this before, here: #6560
That didn't get merged because it felt too magical / special case for DeclarativeRecipe to deduplicate as a silent implementation detail. Instead of doing this the first time we decided on creating Singleton.
But with Singleton alone I cannot find a way to guard the scanning phase without breaking ScanningRecipe.generate(). I tried several things. But a common usage for the scanning phase is to verify whether a file already exists, if I skip those then
generate()will create files they shouldn't because their scanner was skipped by Singleton.So I'm resurrecting the declarative recipe duplicate loading skip. This time I'm keying off the presence of
Singleton, which explicitly opts-in a recipe to desiring this behavior.