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getEnv(): Return std::optional

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This allows distinguishing between an empty value and no value.
This commit is contained in:
Eelco Dolstra 2019-11-22 16:06:44 +01:00
parent fd900c45b5
commit ba87b08f85
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17 changed files with 60 additions and 63 deletions
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src/libstore/local-store.hh
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@ -107,7 +107,7 @@ private:
public:
// Hack for build-remote.cc.
PathSet locksHeld = tokenizeString<PathSet>(getEnv("NIX_HELD_LOCKS"));
PathSet locksHeld;
/* Initialise the local store, upgrading the schema if
necessary. */