Capistrano 部署作曲家错误

Question

使用退出代码运行 capistrano deploy 时出现 composer 错误：

composer exit status: 2

这是错误的完整日志：

Invoke deploy:updated (first_time)
Invoke composer:install (first_time)
Execute composer:install
Invoke composer:run (first_time)
Execute composer:run
INFO[28cd8f39] Running /usr/bin/env composer install --no-dev --no-interaction --verbose --optimize-autoloader on mydomain.com
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing on host mydomain.com: composer exit status: 2
composer stdout: Nothing written
composer stderr: Nothing written
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/command.rb:97:in `exit_status='
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:148:in `block (5 levels) in _execute'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:551:in `call'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:551:in `do_request'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:561:in `channel_request'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:465:in `dispatch_incoming_packets'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:221:in `preprocess'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:205:in `process'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `block in loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:269:in `wait'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:170:in `block (3 levels) in _execute'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:514:in `call'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:514:in `do_open_confirmation'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:545:in `channel_open_confirmation'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:465:in `dispatch_incoming_packets'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:221:in `preprocess'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:205:in `process'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `block in loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:172:in `block (2 levels) in _execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:186:in `with_ssh'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:131:in `block in _execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `tap'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `_execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:66:in `execute'
/var/lib/gems/1.9.1/gems/capistrano-composer-0.0.4/lib/capistrano/tasks/composer.rake:27:in `block (4 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/abstract.rb:77:in `within'
/var/lib/gems/1.9.1/gems/capistrano-composer-0.0.4/lib/capistrano/tasks/composer.rake:26:in `block (3 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `run'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:13:in `block (2 levels) in execute'
SSHKit::Command::Failed: composer exit status: 2
composer stdout: Nothing written
composer stderr: Nothing written
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/command.rb:97:in `exit_status='
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:148:in `block (5 levels) in _execute'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:551:in `call'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:551:in `do_request'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:561:in `channel_request'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:465:in `dispatch_incoming_packets'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:221:in `preprocess'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:205:in `process'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `block in loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:269:in `wait'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:170:in `block (3 levels) in _execute'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:514:in `call'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/channel.rb:514:in `do_open_confirmation'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:545:in `channel_open_confirmation'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:465:in `dispatch_incoming_packets'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:221:in `preprocess'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:205:in `process'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `block in loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/net-ssh-2.9.1/lib/net/ssh/connection/session.rb:169:in `loop'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:172:in `block (2 levels) in _execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:186:in `with_ssh'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:131:in `block in _execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `tap'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:128:in `_execute'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:66:in `execute'
/var/lib/gems/1.9.1/gems/capistrano-composer-0.0.4/lib/capistrano/tasks/composer.rake:27:in `block (4 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/abstract.rb:77:in `within'
/var/lib/gems/1.9.1/gems/capistrano-composer-0.0.4/lib/capistrano/tasks/composer.rake:26:in `block (3 levels) in <top (required)>'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `instance_exec'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/backends/netssh.rb:54:in `run'
/var/lib/gems/1.9.1/gems/sshkit-1.5.1/lib/sshkit/runners/parallel.rb:13:in `block (2 levels) in execute'
Tasks: TOP => composer:run
The deploy has failed with an error: #<SSHKit::Runner::ExecuteError: Exception while executing on host mydomain.com: composer exit status: 2
composer stdout: Nothing written
composer stderr: Nothing written
>
** Invoke deploy:failed (first_time)
** Execute deploy:failed

我正在使用 capistrano 3.2.0 版和最新版本的 capistrano-composer。

可能是什么问题？

Answer 1

（问题已在 cmets 或编辑中回答。见 Question with no answers, but issue solved in the comments (or extended in chat)）

OP 写道：

不知何故，问题出在 composer install 命令中。我已经通过在 composer install 之前运行 composer update 解决了这个问题，并且部署成功了。

这是在 composer:install 之前运行 composer:update 的代码。

namespace :composer do
    before 'install', 'change_dir'

    desc 'Composer update'
    task :change_dir do
        on roles(:app) do
            execute "cd #{release_path}/ && composer update"
        end
    end
end