perf(libstore/derivation-builder): pre-compute outputGraph for linear complexity #14540
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… complexity Build the output reference graph and inverse output map before running topoSort, avoiding quadratic complexity when determining which outputs reference each other. This fixes the FIXME comment about building the inverted map up front. The outputGraph (StorePath → StorePathSet) maps each output to its references, and will be reused in future commits to generate detailed cycle error messages showing which files contain problematic references. Adapted from Lix commit 10c04ce84. Change-Id: Ibdd46e7b2e895bfeeebc173046d1297b41998181 Co-Authored-By: Maximilian Bosch <[email protected]>
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Motivation
Build the output reference graph and inverse output map before running
topoSort, avoiding quadratic complexity when determining which outputs
reference each other. This fixes the FIXME comment about building the
inverted map up front.
The outputGraph (StorePath → StorePathSet) maps each output to its
references, and will be reused in future commits to generate detailed
cycle error messages showing which files contain problematic references.
Adapted from Lix commit 10c04ce84.
Change-Id: Ibdd46e7b2e895bfeeebc173046d1297b41998181
Co-Authored-By: Maximilian Bosch [email protected]
Context
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