lestrrat / go-envload

[MOVED] See github.com/lestrrat-go/envload

go-envload

Restore environment variables, so you can break 'em

WARNING

This repository has been moved to github.com/lestrrat-go/envload. This repository exists so that libraries pointing to this URL will keep functioning, but this repository will NOT be updated in the future. Please use the new import path.

SYNOPSIS

DESCRIPTION

Certain applications that require reloading of configuraiton from environment variables are sensitive to these values being changed.

Or maybe you are writing a test that wants to temporarily change the value of an environment variable, but you don't want it to linger afterwards.

In other languages this can be done with a "temporary" variable, like in Perl5:

use strict;
use 5.24;

sub foo {
  $ENV{IMPORTANT_VAR} = "foo";
  say $ENV{IMPORTANT_VAR}; # "foo"

  {
    local %ENV = %ENV; # inherit the original %ENV,
    $ENV{IMPORTANT_VAR} = "bar";
    say $ENV{IMPORTANT_VAR}; # "bar"
  }
  # 

  say $ENV{IMPORTANT_VAR}; # "bar"
}

This library basically allows you to do this in Go