Class: Ask::Tools::Bash

Inherits:
Ask::Tool
  • Object
show all
Defined in:
lib/ask/tools/shell/bash.rb

Overview

Execute shell commands in a sandboxed environment. Returns stdout, stderr, exit code, and a timed_out flag. Output is truncated to 100KB.

Constant Summary collapse

MAX_OUTPUT_SIZE = 
102_400

Instance Method Summary collapse

Instance Method Details

#execute(command:, timeout: 30, workdir: nil) ⇒ Object 



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# File 'lib/ask/tools/shell/bash.rb', line 24

def execute(command:, timeout: 30, workdir: nil)
  Dir.mktmpdir("ask_bash") do |dir|
    workdir ||= dir

    stdout = StringIO.new
    stderr = StringIO.new
    timed_out = false
    exit_code = -1

    begin
      Open3.popen3("bash", "-c", command, chdir: workdir) do |stdin, out, err, wait_thr|
        stdin.close

        threads = [
          Thread.new { IO.copy_stream(out, stdout) rescue nil },
          Thread.new { IO.copy_stream(err, stderr) rescue nil }
        ]

        unless wait_thr.join(timeout)
          Process.kill("-KILL", wait_thr.pid) rescue nil
          timed_out = true
        end

        threads.each(&:join)
        exit_code = timed_out ? -1 : wait_thr.value.exitstatus
      end
    rescue => e
      return Ask::Result.error(message: "Bash execution failed: #{e.message}",
                               metadata: { stdout: stdout.string, stderr: stderr.string })
    end

    out_text = stdout.string
    err_text = stderr.string

    if out_text.length > MAX_OUTPUT_SIZE
      header = "[Output truncated to #{MAX_OUTPUT_SIZE / 1024}KB]\n"
      out_text = "#{header}#{out_text[-(MAX_OUTPUT_SIZE - header.length)..]}"
    end

    if err_text.length > MAX_OUTPUT_SIZE
      header = "[Error output truncated to #{MAX_OUTPUT_SIZE / 1024}KB]\n"
      err_text = "#{header}#{err_text[-(MAX_OUTPUT_SIZE - header.length)..]}"
    end

    Ask::Result.ok(data: {
      stdout: out_text,
      stderr: err_text,
      exit_code: exit_code,
      timed_out: timed_out
    })
  end
end