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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/nix-env/nix-env.cc
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@ -1425,7 +1425,7 @@ static int _main(int argc, char * * argv)
globals.instSource.autoArgs = myArgs.getAutoArgs(*globals.state);
if (globals.profile == "")
globals.profile = getEnv("NIX_PROFILE", "");
globals.profile = getEnv("NIX_PROFILE").value_or("");
if (globals.profile == "") {
Path profileLink = getHome() + "/.nix-profile";