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require "docker"
require "train/plugins"
module Train::Transports
class Podman < Train.plugin(1)
name "podman"
include_options Train::Extras::CommandWrapper
option :host, required: true
option :podman_url, required: false
def connection(state = {}, &block)
opts = merge_options(options, state || {})
validate_options(opts)
if @connection && @connection_options == opts
reuse_connection(&block)
else
create_new_connection(opts, &block)
end
end
private
# Creates a new Podman connection instance and save it for potential future
# reuse.
#
# @param options [Hash] connection options
# @return [Podman::Connection] a Podman connection instance
# @api private
def create_new_connection(options, &block)
if @connection
logger.debug("[Podman] shutting previous connection #{@connection}")
@connection.close
end
@connection_options = options
@connection = Connection.new(options, &block)
end
# Return the last saved Podman connection instance.
#
# @return [Podman::Connection] a Podman connection instance
# @api private
def reuse_connection
logger.debug("[Podman] reusing existing connection #{@connection}")
yield @connection if block_given?
@connection
end
end
class Train::Transports::Podman
class Connection < BaseConnection
def initialize(options)
super(options)
@id = options[:host]
if RUBY_PLATFORM =~ /windows|mswin|msys|mingw|cygwin/
raise "Unsupported host platform."
end
# Currently Podman url can be set using option and setting the environment variable.
uid = Process.uid
podman_url = options[:podman_url] || ENV["CONTAINER_HOST"]
podman_url ||= "unix:///run/podman/podman.sock" if uid == 0
podman_url ||= "unix:///run/user/#{uid}/podman/podman.sock"
Docker.url = podman_url
# Using docker-api ruby library to fetch the Podman container data.
@container = ::Docker::Container.get(@id) ||
raise("Can't find Podman container #{@id}")
@cmd_wrapper = nil
@cmd_wrapper = CommandWrapper.load(self, @options)
@probably_windows = nil
rescue Excon::Error::Socket
raise Train::TransportError, "Unable to connect to Podman using #{podman_url}"
rescue Docker::Error::NotFoundError => e
raise Train::TransportError, "Container Not Found: #{e.message}"
rescue Docker::Error::ServerError => e
raise Train::TransportError, "#{e.message}"
end
def close
# nothing to do at the moment
end
def uri
if @container.nil?
"podman://#{@id}"
else
"podman://#{@container.id}"
end
end
def unique_identifier
@container.nil? ? @id : @container.id # default uuid set to the podman host.
end
private
def file_via_connection(path)
if os.aix?
Train::File::Remote::Aix.new(self, path)
elsif os.solaris?
Train::File::Remote::Unix.new(self, path)
elsif os.windows?
Train::File::Remote::Windows.new(self, path)
else
Train::File::Remote::Linux.new(self, path)
end
end
def run_command_via_connection(cmd, &_data_handler)
cmd = @cmd_wrapper.run(cmd) unless @cmd_wrapper.nil?
# Cannot use os.windows? here because it calls run_command_via_connection,
# causing infinite recursion during initial platform detection
if sniff_for_windows?
invocation = cmd_run_command(cmd)
else
invocation = sh_run_command(cmd)
end
stdout, stderr, exit_status = @container.exec(
invocation, user: @options[:user]
)
CommandResult.new(stdout.join, stderr.join, exit_status)
rescue ::Docker::Error::DockerError => _
raise
rescue => _
# @TODO: differentiate any other error
raise
end
def sh_run_command(cmd)
["/bin/sh", "-c", cmd]
end
def cmd_run_command(cmd)
["cmd.exe", "/s", "/c", cmd]
end
def sniff_for_windows?
return @probably_windows unless @probably_windows.nil?
# Run a command using /bin/sh, which should fail under Windows
stdout, _stderr, _exit_status = @container.exec(
sh_run_command("true"), user: @options[:user]
)
@probably_windows = !!stdout.detect { |l| l.include? "failure in a Windows system call" }
end
end
end
end
|
