Use structured environment variable handling with explicit validation instead of directly accessing ENV hash. Implement proper parsing for boolean values, default values, and type conversion. Consider making paths user-specific when creating temporary configurations.
Use structured environment variable handling with explicit validation instead of directly accessing ENV hash. Implement proper parsing for boolean values, default values, and type conversion. Consider making paths user-specific when creating temporary configurations.
For boolean environment variables, handle falsy values properly:
# Instead of this:
if ENV["HOMEBREW_SOME_FLAG"].present?
# Do something
end
# Do this:
if Homebrew::EnvConfig.some_flag?
# Do something
end
# When implementing environment variable handlers:
def env_method_name(env, hash)
if hash[:boolean]
define_method(method_name) do
env_value = ENV.fetch(env, nil)
falsy_values = %w[false no off nil 0]
if falsy_values.include?(env_value&.downcase)
false
else
ENV[env].present?
end
end
end
end
For configuration paths that may be shared across users, add user-specific identifiers:
# Instead of this:
zdotdir = Pathname.new(HOMEBREW_TEMP/"brew-zsh-prompt")
# Do this:
zdotdir = Pathname.new(HOMEBREW_TEMP/"brew-zsh-prompt-#{Process.euid}")
This approach provides consistent interpretation of configuration values, reduces bugs from unexpected environment variable content, and prevents permission issues with shared configuration paths.
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