304249604a
If two Specs have the same hash (and prefix) but are not equal, Spack originally had logic to detect this and raise an error (since both cannot be installed in the same place). Recently this has eroded and the check no-longer works; moreover, when defining projections (which may truncate the hash or other distinguishing properties from the prefix) Spack was also failing to detect collisions (in both of these cases, Spack would overwrite the old prefix with the new Spec). This PR maintains a list of all "taken" prefixes: if a hash is not registered (i.e. recorded as installed in the database) but the prefix is occupied, that is a collision. This can detect collisions created by defining projections (specifically when they omit the hash). The PR does not detect collisions where specs have the same hash (and prefix) but are not equal. |
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