flakes: ensure that flake packages don't throw during construction
#657
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Our `tools` construction returns `null` for packages that are missing (for whatever reason). While this works okay for our internal module system, external consumers of the packages output sometimes make the assumption that these are all valid derivations. At some point we added a filter that would remove the nulls, however this introduced even worse issues. To filter out the nulls, we need to evaluate each tool. But not all tools can be evaluated: some are stubs that throws (useful) errors. So now we're forced to supress removal notices and other messages to be able to evaluate the tool list. This commit refactors tools to return placeholder derivations. These can be safely filtered out if needed.
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Our
toolsconstruction returnsnullfor packages that are missing (for whatever reason). While this works okay for our internal module system, external consumers of the packages output sometimes make the assumption that these are all valid derivations.At some point we added a filter that would remove the nulls, however this introduced even worse issues. To filter out the nulls, we need to evaluate each tool. But not all tools can be evaluated: some are stubs that throws (useful) errors. So now we're forced to supress removal notices and other messages to be able to evaluate the tool list.
This commit refactors tools to return placeholder derivations. These can be safely filtered out if needed.