Tool throws an error.

[vpillinger]

While trying to run the following command I get an error. I have no idea if this is something wrong my code or a bug in the function. I am running a homestead box in vagrant where I have installed ruby through apt-get. ssh [email protected] 'hostname; uptime' does work.

bundle exec cap staging ssh:doctor --trace

bundle exec cap staging ssh:doctor --trace
** Invoke staging (first_time)
** Execute staging
** Invoke load:defaults (first_time)
** Execute load:defaults
** Invoke ssh:doctor (first_time)
** Execute ssh:doctor
** Invoke ssh:config:git (first_time)
** Execute ssh:config:git
** Invoke ssh:config:repo_url (first_time)
** Execute ssh:config:repo_url
** Invoke ssh:config:password (first_time)
** Execute ssh:config:password
** Invoke ssh:config:agent_forwarding (first_time)
** Execute ssh:config:agent_forwarding
** Invoke ssh:local:private_key_exists (first_time)
** Execute ssh:local:private_key_exists
** Invoke ssh:local:agent_running_env_var (first_time)
** Execute ssh:local:agent_running_env_var
** Invoke ssh:local:agent_running_ssh_add (first_time)
** Execute ssh:local:agent_running_ssh_add
4096 SHA256:RfPTmZLA/sLeUxe5Rgn9VgQoTa4fMWJyMRBWUZXFC2o /home/vagrant/.ssh/id_rsa (RSA)
** Invoke ssh:local:repo_access (first_time)
** Execute ssh:local:repo_access
31c638fe5a33d9e40a5c9eee07a94deb9cb76adc        HEAD
... Truncated all of the branches here
ef090b63ca0b772390a1db03cc7c118af20e8733        refs/tags/1.8.9
** Invoke ssh:remote:agent_running (first_time)
** Execute ssh:remote:agent_running
#<Thread:0x000055c0e6d56e50@/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:11 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
        8: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:13:in `block (2 levels) in execute'
        7: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `run'
        6: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
        5: from /var/lib/gems/2.5.0/gems/capistrano-ssh-doctor-1.0.0/lib/capistrano/tasks/ssh_doctor.rake:87:in `block (4 levels) in <top (required)>'
        4: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:77:in `capture'
        3: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `_execute'
        2: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `tap'
        1: from /var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:129:in `block in _execute'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/formatters/pretty.rb:8:in `write': Exception while executing on host 167.99.230.85: undefined method `<' for nil:NilClass (SSHKit::Runner::ExecuteError)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing on host 167.99.230.85: undefined method `<' for nil:NilClass
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/formatters/pretty.rb:8:in `write'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:129:in `block in _execute'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `tap'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `_execute'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:77:in `capture'
/var/lib/gems/2.5.0/gems/capistrano-ssh-doctor-1.0.0/lib/capistrano/tasks/ssh_doctor.rake:87:in `block (4 levels) in <top (required)>'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `run'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:13:in `block (2 levels) in execute'
NoMethodError: undefined method `<' for nil:NilClass
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/formatters/pretty.rb:8:in `write'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:129:in `block in _execute'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `tap'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `_execute'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:77:in `capture'
/var/lib/gems/2.5.0/gems/capistrano-ssh-doctor-1.0.0/lib/capistrano/tasks/ssh_doctor.rake:87:in `block (4 levels) in <top (required)>'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `run'
/var/lib/gems/2.5.0/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:13:in `block (2 levels) in execute'
Tasks: TOP => ssh:remote:agent_running

Here is my staging file

# Simple Role Syntax
# ==================
# Supports bulk-adding hosts to roles, the primary server in each group
# is considered to be the first unless any hosts have the primary
# property set.  Don't declare `role :all`, it's a meta role.

role :app, %w{[email protected]}
role :web, %w{[email protected]}
role :db,  %w{[email protected]}


# Extended Server Syntax
# ======================
# This can be used to drop a more detailed server definition into the
# server list. The second argument is a, or duck-types, Hash and is
# used to set extended properties on the server.

server '167.99.230.85', user: 'runcloud', roles: %w{web app}, my_property: :my_value


# Custom SSH Options
# ==================
# You may pass any option but keep in mind that net/ssh understands a
# limited set of options, consult[net/ssh documentation](http://net-ssh.github.io/net-ssh/classes/Net/SSH.html#method-c-start).
#
# Global options
# --------------
set :ssh_options, {
	keys: %w(~/.ssh/id_rsa),
    forward_agent: true,
    auth_methods: %w(password)
}
#
# And/or per server (overrides global)
# ------------------------------------
# server 'example.com',
#   user: 'user_name',
#   roles: %w{web app},
#   ssh_options: {
#     user: 'user_name', # overrides user setting above
#     keys: %w(/home/user_name/.ssh/id_rsa),
#     forward_agent: false,
#     auth_methods: %w(publickey password)
#     # password: 'please use keys'
#   }

And my deploy file

# config valid only for Capistrano 3.1
lock '3.2.1'

set :application, 'my_app_name'
set :repo_url, '[email protected]:roots/bedrock.git'

# Default branch is :master
# ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call

# Default deploy_to directory is /var/www/my_app
# set :deploy_to, '/var/www/my_app'

# Default value for :scm is :git
# set :scm, :git

# Default value for :format is :pretty
# set :format, :pretty

# Default value for :log_level is :debug
# set :log_level, :debug

# Default value for :pty is false
# set :pty, true

# Default value for :linked_files is []
# set :linked_files, %w{config/database.yml}

# Default value for linked_dirs is []
# set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

# Default value for default_env is {}
# set :default_env, { path: "/opt/ruby/bin:$PATH" }

# Default value for keep_releases is 5
# set :keep_releases, 5

namespace :deploy do

  desc 'Restart application'
  task :restart do
    on roles(:app), in: :sequence, wait: 5 do
      # Your restart mechanism here, for example:
      # execute :touch, release_path.join('tmp/restart.txt')
    end
  end

  after :publishing, :restart

  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      # Here we can do anything such as:
      # within release_path do
      #   execute :rake, 'cache:clear'
      # end
    end
  end

end

[vpillinger]

I have found that removing ALL roles settings has resolved the issue. Its not clear to me why this is causing an issue though.

Update 2:

I fixed this by running bundle update. However, the most recent version on capistrano threw a different error, so I ended up forcing Capistrano version 3.6 and everything runs well now.