Deployment issue using Mina to deploy Rails5 app. Hangs on updating Symlink - ruby-on-rails

Question

After a mina deploy, it's hanging on "Updating the /home/x/app/current symlink". No errors. It just sits there.
I have tried removing the app directory from the server and "mina setup", but still encountering the same problem. I had no issues deploying initially, but it seems any attempt to deploy subsequent releases results in this problem.
I initially followed this guide to deploy: https://www.ralfebert.de/tutorials/rails-deployment/
require 'mina/rails'
require 'mina/git'
require 'mina/rvm'
# Basic settings:
# domain - The hostname to SSH to.
# deploy_to - Path to deploy into.
# repository - Git repo to clone from. (needed by mina/git)
# branch - Branch name to deploy. (needed by mina/git)
set :application_name, 'x'
set :domain, 'x'
set :user, fetch(:application_name)
set :deploy_to, "/home/#{fetch(:user)}/app"
set :repository, 'x'
set :branch, 'x'
set :rvm_use_path, '/etc/profile.d/rvm.sh'
# Optional settings:
# set :user, 'foobar' # Username in the server to SSH to.
# set :port, '30000' # SSH port number.
# set :forward_agent, true # SSH forward_agent.
# shared dirs and files will be symlinked into the app-folder by the 'deploy:link_shared_paths' step.
# set :shared_dirs, fetch(:shared_dirs, []).push('somedir')
set :shared_files, fetch(:shared_files, []).push('config/database.yml', 'config/secrets.yml')
# This task is the environment that is loaded for all remote run commands, such as
# `mina deploy` or `mina rake`.
task :environment do
ruby_version = File.read('.ruby-version').strip
raise "Couldn't determine Ruby version: Do you have a file .ruby-version in your project root?" if ruby_version.empty?
invoke :'rvm:use', ruby_version
end
task :setup do
in_path(fetch(:shared_path)) do
command %[mkdir -p config]
# Create database.yml for Postgres if it doesn't exist
path_database_yml = "config/database.yml"
database_yml = %[production:
database: #{fetch(:user)}
adapter: postgresql
pool: 5
timeout: 5000]
command %[test -e #{path_database_yml} || echo "#{database_yml}" > #{path_database_yml}]
# Create secrets.yml if it doesn't exist
path_secrets_yml = "config/secrets.yml"
secrets_yml = %[production:\n secret_key_base:\n #{`rake secret`.strip}]
command %[test -e #{path_secrets_yml} || echo "#{secrets_yml}" > #{path_secrets_yml}]
# Remove others-permission for config directory
command %[chmod -R o-rwx config]
end
end
desc "Deploys the current version to the server."
task :deploy do
# uncomment this line to make sure you pushed your local branch to the remote origin
# invoke :'git:ensure_pushed'
deploy do
# Put things that will set up an empty directory into a fully set-up
# instance of your project.
invoke :'git:clone'
invoke :'deploy:link_shared_paths'
invoke :'bundle:install'
# invoke :'rails:db_migrate'
invoke :'rails:assets_precompile'
invoke :'deploy:cleanup'
on :launch do
command "sudo service #{fetch(:user)} restart"
end
end
# you can use `run :local` to run tasks on local machine before of after the deploy scripts
# run(:local){ say 'done' }
end
# For help in making your deploy script, see the Mina documentation:
#
# - https://github.com/mina-deploy/mina/tree/master/docs

Answer 1

I used the same great tutorial, got the same problem.
You can run mina deploy --verbose to see where it stuck.
For me it was not the symlink updating, but sudo service rails-demo restart command.
I used sudo visudo on the server and put the following line there:
rails-demo ALL=(ALL) NOPASSWD: /usr/sbin/service rails-demo restart
Now it works like a charm.
Good luck!