Files
kamal/lib/kamal/env_file.rb
dhh 873be0b76b Extract Kamal::EnvFile
Cleaning up the Utils junk drawer.
2023-09-16 10:55:41 -07:00

42 lines
1.2 KiB
Ruby

# Encode an env hash as a string where secret values have been looked up and all values escaped for Docker.
class Kamal::EnvFile
def initialize(env)
@env = env
end
def to_s
env_file = StringIO.new.tap do |contents|
if (secrets = @env["secret"]).present?
@env.fetch("secret", @env)&.each do |key|
contents << docker_env_file_line(key, ENV.fetch(key))
end
@env["clear"]&.each do |key, value|
contents << docker_env_file_line(key, value)
end
else
@env.fetch("clear", @env)&.each do |key, value|
contents << docker_env_file_line(key, value)
end
end
end.string
# Ensure the file has some contents to avoid the SSHKIT empty file warning
env_file.presence || "\n"
end
alias to_str to_s
private
def docker_env_file_line(key, value)
"#{key.to_s}=#{escape_docker_env_file_value(value)}\n"
end
# Escape a value to make it safe to dump in a docker file.
def escape_docker_env_file_value(value)
# Doublequotes are treated literally in docker env files
# so remove leading and trailing ones and unescape any others
value.to_s.dump[1..-2].gsub(/\\"/, "\"")
end
end