bc82a825939b3d3fc0bfc29b4c9b6d94d365b26a
Since it read the actual roots after determining the set of desired roots, there was a possibility that it would delete roots added by hydra-evaluator or hydra-build while hydra-update-gc-roots was running. This could cause a derivation to be garbage-collected before the build was performed, for instance. Now the actual roots are read first, so any root added after that time is not deleted.
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