refactor(tvix): getEnv(): Return std::optional
This allows distinguishing between an empty value and no value.
Patch ported from upstream at
ba87b08f85
Change-Id: I061cc8e16b1a7a0341adfc3b0edca1c0c51d5c97
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1884
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
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17 changed files with 66 additions and 66 deletions
2
third_party/nix/src/libutil/util.hh
vendored
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third_party/nix/src/libutil/util.hh
vendored
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@ -26,7 +26,7 @@ struct Source;
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extern const std::string nativeSystem;
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/* Return an environment variable. */
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std::string getEnv(const std::string& key, const std::string& def = "");
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std::optional<std::string> getEnv(const std::string& key);
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/* Get the entire environment. */
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std::map<std::string, std::string> getEnv();
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