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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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2
src/libstore/globals.hh
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@ -66,7 +66,7 @@ public:
/* File name of the socket the daemon listens to. */
Path nixDaemonSocketFile;
Setting<std::string> storeUri{this, getEnv("NIX_REMOTE", "auto"), "store",
Setting<std::string> storeUri{this, getEnv("NIX_REMOTE").value_or("auto"), "store",
"The default Nix store to use."};
Setting<bool> keepFailed{this, false, "keep-failed",