Class: OsCtld::Commands::Container::Cat

Inherits:
Base
  • Object
show all
Defined in:
lib/osctld/commands/container/cat.rb

Instance Attribute Summary

Attributes inherited from Base

#client, #client_handler, #id, #opts

Instance Method Summary collapse

Methods inherited from Base

#base_execute, #call_cmd, #call_cmd!, #error, #error!, handle, #handled, #indirect?, #initialize, #manipulate, #manipulation_holder, #ok, #progress, #request_stop, run, run!

Constructor Details

This class inherits a constructor from OsCtld::Commands::Base

Instance Method Details

#execute ⇒ Object 



7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
 
# File 'lib/osctld/commands/container/cat.rb', line 7

def execute
  ct = DB::Containers.find(opts[:id], opts[:pool])
  error!('container not found') unless ct
  error!('container not running') if !ct.running? || ct.init_pid.nil?

  # Ensure the container is mounted
  ct.mount

  client.send("#{{ status: true, response: 'continue' }.to_json}\n", 0)

  out_w = client.recv_io

  errors =
    ContainerControl::Commands::WithMountns.run!(
      ct,
      ns_pid: ct.init_pid,
      # Passing out_w as stdout will keep the file descriptor open
      # on fork. It will however not be set as $stdout as WithMountns
      # does not handle it, the write therefore still goes to out_w.
      stdout: out_w,
      block: proc do
        ret = {}

        opts[:files].each do |file|
          File.open(file) do |io|
            ::IO.copy_stream(io, out_w)
          end
        rescue SystemCallError => e
          ret[file] = e.message
        end

        ret
      end
    )

  out_w.close

  ok(errors:)
rescue ContainerControl::Error => e
  error(e.message)
end