Switch to positive check for linkInputDirectories #1500
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werkt
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Selecting realInputDirectories by regex permits flexible patterns that can yield drastic improvements in directory reuse for specialized deployments. runfiles in particular are hazardous expansions of nearly-execroot in the case of bazel. Care must be taken to match directories exclusively. The entire input tree is traversed for matches against expanded paths under the root, to allow for nested selection. Each match thus costs the number of input directories. Counterintuitively, OutputFiles are augmented to avoid the recursive check for OutputDirectories which only applies to actual reported results, resulting in a path match when creating the exec root. Regex style is java.util.Pattern, and must match the full input directory.
This will include the path to the missed directory and the operation which required it.
Prevent adding duplicate realInputDirectories matches
Ensure that the last leg of the execution presents a directory, rather than the parent, per OutputDirectory's stamping.
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