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#include <cstring>
#include <map>
#include <optional>
#include <string>
extern char * * environ __attribute__((weak));
namespace nix {
std::optional<std::string> getEnv(const std::string & key)
{
char * value = getenv(key.c_str());
if (!value) return {};
return std::string(value);
}
std::optional<std::string> getEnvNonEmpty(const std::string & key) {
auto value = getEnv(key);
if (value == "") return {};
return value;
}
std::map<std::string, std::string> getEnv()
{
std::map<std::string, std::string> env;
for (size_t i = 0; environ[i]; ++i) {
auto s = environ[i];
auto eq = strchr(s, '=');
if (!eq)
// invalid env, just keep going
continue;
env.emplace(std::string(s, eq), std::string(eq + 1));
}
return env;
}
void clearEnv()
{
for (auto & name : getEnv())
unsetenv(name.first.c_str());
}
void replaceEnv(const std::map<std::string, std::string> & newEnv)
{
clearEnv();
for (auto & newEnvVar : newEnv)
setenv(newEnvVar.first.c_str(), newEnvVar.second.c_str(), 1);
}
}
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