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b239e0d368
The helper is like ::getenv() but checks if the variable exists and
throws descriptive exception. So instead of
fatal error: in "...": std::logic_error: basic_string: construction from null is not valid
one could get something like
fatal error: in "...": std::logic_error: Environment variable ... not set
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>