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Co-Authored-By: Cole Helbling <cole.e.helbling@outlook.com>
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John Ericson 2020-03-19 23:37:52 -04:00 • committed by GitHub
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10
src/libstore/derivations.hh
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@ -100,14 +100,14 @@ typedef std::variant<
specified content hash and hash algorithm. (Currently they must have
exactly one output (`out'), which is specified using the `outputHash'
and `outputHashAlgo' attributes, but the algorithm doesn't assume
this). We don't want changes to such derivations to propagate upwards
this.) We don't want changes to such derivations to propagate upwards
through the dependency graph, changing output paths everywhere.
For instance, if we change the url in a call to the `fetchurl'
function, we do not want to rebuild everything depending on it (after
all, (the hash of) the file being downloaded is unchanged). So the
*output paths* should not change. On the other hand, the *derivation
paths* should change to reflect the new dependency graph.
function, we do not want to rebuild everything depending on it---after
all, (the hash of) the file being downloaded is unchanged. So the
*output paths* should not change. On the other hand, the *derivation
paths* should change to reflect the new dependency graph.
For fixed output derivations, this returns a map from the names of
each output to hashes unique up to the outputs' contents.