39 lines
1.1 KiB
Ruby
39 lines
1.1 KiB
Ruby
# Encode an env hash as a string where secret values have been looked up and all values escaped for Docker.
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class Kamal::EnvFile
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def initialize(env)
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@env = env
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end
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def to_s
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env_file = StringIO.new.tap do |contents|
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@env.each do |key, value|
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contents << docker_env_file_line(key, value)
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end
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end.string
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# Ensure the file has some contents to avoid the SSHKIT empty file warning
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env_file.presence || "\n"
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end
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alias to_str to_s
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private
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def docker_env_file_line(key, value)
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"#{key}=#{escape_docker_env_file_value(value)}\n"
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end
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# Escape a value to make it safe to dump in a docker file.
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def escape_docker_env_file_value(value)
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# keep non-ascii(UTF-8) characters as it is
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value.to_s.scan(/[\x00-\x7F]+|[^\x00-\x7F]+/).map do |part|
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part.ascii_only? ? escape_docker_env_file_ascii_value(part) : part
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end.join
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end
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def escape_docker_env_file_ascii_value(value)
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# Doublequotes are treated literally in docker env files
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# so remove leading and trailing ones and unescape any others
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value.to_s.dump[1..-2].gsub(/\\"/, "\"")
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end
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end
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