Capistrano rails deploy - passphrase for SSH key not authenticating - ruby-on-rails

Question

I am trying to deploy my rails app with Capistrano. While deploying it asks for the passphrase for key '/home/gokul/.ssh/id_rsa' but, I can't able to type the passphrase the characters are visible and not authenticating.
deploy.rb
# Server
server 'xxx.xxx.xxx.xxx', roles: [:web, :app, :db], primary: true
# Repository
set :repo_url, 'git#bitbucket.org:gokul/testapp.git'
set :scm_passphrase, ''
set :application, 'testapp'
set :user, 'gokul'
set :puma_threads, [4, 16]
set :puma_workers, 0
# Don't change these unless you know what you're doing
set :pty, true
set :use_sudo, false
set :stage, :production
set :deploy_via, :remote_cache
set :deploy_to, "/home/#{fetch(:user)}/APP/#{fetch(:application)}"
set :puma_bind, "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock"
set :puma_state, "#{shared_path}/tmp/pids/puma.state"
set :puma_pid, "#{shared_path}/tmp/pids/puma.pid"
set :puma_access_log, "#{release_path}/log/puma.error.log"
set :puma_error_log, "#{release_path}/log/puma.access.log"
set :ssh_options, { forward_agent: true, user: fetch(:user), auth_methods: ['publickey'], keys: %w(~/.ssh/privatekey.pem) }
set :puma_preload_app, true
set :puma_worker_timeout, nil
set :puma_init_active_record, true # Change to false when not using ActiveRecord
## Defaults:
# set :scm, :git
# set :branch, :master
# set :format, :pretty
# set :log_level, :debug
# set :keep_releases, 5
## Linked Files & Directories (Default None):
# set :linked_files, %w{config/database.yml}
# set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}
set :linked_dirs, %w(tmp/pids)
namespace :puma do
desc 'Create Directories for Puma Pids and Socket'
task :make_dirs do
on roles(:app) do
execute "mkdir #{shared_path}/tmp/sockets -p"
execute "mkdir #{shared_path}/tmp/pids -p"
end
end
before :start, :make_dirs
end
namespace :deploy do
desc "Make sure local git is in sync with remote."
task :check_revision do
on roles(:app) do
unless `git rev-parse HEAD` == `git rev-parse origin/master`
puts "WARNING: HEAD is not the same as origin/master"
puts "Run `git push` to sync changes."
exit
end
end
end
desc 'Initial Deploy'
task :initial do
on roles(:app) do
before 'deploy:restart', 'puma:start'
invoke 'deploy'
end
end
desc 'Restart application'
task :restart do
on roles(:app), in: :sequence, wait: 5 do
invoke 'puma:restart'
end
end
before :starting, :check_revision
after :finishing, :compile_assets
after :finishing, :cleanup
after :finishing, :restart
end
# ps aux | grep puma # Get puma pid
# kill -s SIGUSR2 pid # Restart puma
# kill -s SIGTERM pid # Stop puma
Deployment Log:
It is asking for the passphrase but while entering the passphrase it is visible and not authenticating.
gokul$ cap production deploy
rvm 1.29.1 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io/]
ruby-2.3.1
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
00:00 git:wrapper
01 mkdir -p /tmp
✔ 01 gokul#xxx.xxx.xxx.xxx 0.708s
Uploading /tmp/git-ssh-testapp-gokul.sh 100.0%
02 chmod 700 /tmp/git-ssh-testapp-gokul.sh
✔ 02 gokul#xxx.xxx.xxx.xxx 0.706s
00:03 git:check
01 git ls-remote git#bitbucket.org:gokul/testapp.git HEAD
01 Enter passphrase for key '/home/gokul/.ssh/id_rsa':
password
a
sde
we
ere
re
e
e
e
^C(Backtrace restricted to imported tasks)
cap aborted!
Interrupt:
Tasks: TOP => deploy:check => git:check
(See full trace by running task with --trace)
The deploy has failed with an error:
I tried setting pty as false as answered in https://stackoverflow.com/a/23227003/4172728. But this doesn't work for me.
Can anyone help me please.
Thank you.

Answer 1

I solved this issue by adding my local machine public key from ~/.ssh/id_rsa.pub to the list of access keys in the bitbucket repository settings.
And then, added the id_rsa to the ssh-agent as below:
gokul$ ssh-add ~/.ssh/id_rsa
Ref: https://confluence.atlassian.com/bitbucket/set-up-ssh-for-git-728138079.html