Capistrano 3 fails on assets:precompile - ruby-on-rails

Question

I can't deploy my Rails 4 app with strange error on assets:precompile. It's seems like task can't use installed gems.
In development and production environment on local machine all works perfectly. Part of deploy log:
INFO[286bfe45] Running ~/.rvm/bin/rvm 2.2.0#gemset do bundle install --binstubs /var/www/app/shared/bin --path /var/www/app/shared/bundle --without development test --deployment --quiet on app.com
DEBUG[286bfe45] Command: cd /var/www/app/releases/20150411140229 && ~/.rvm/bin/rvm 2.2.0#gemset do bundle install --binstubs /var/www/app/shared/bin --path /var/www/app/shared/bundle --without development test --deployment --quiet
INFO[286bfe45] Finished in 2.512 seconds with exit status 0 (successful).
DEBUG[6abacc25] Running /usr/bin/env if test ! -d /var/www/app/releases/20150411140229; then echo "Directory does not exist '/var/www/app/releases/20150411140229'" 1>&2; false; fi on app.com
DEBUG[6abacc25] Command: if test ! -d /var/www/app/releases/20150411140229; then echo "Directory does not exist '/var/www/app/releases/20150411140229'" 1>&2; false; fi
DEBUG[6abacc25] Finished in 0.252 seconds with exit status 0 (successful).
INFO[6a11bfd6] Finished in 1.650 seconds with exit status 0 (successful).
DEBUG[9a60b6ea] Running /usr/bin/env if test ! -d /var/www/app/releases/20150411140229; then echo "Directory does not exist '/var/www/app/releases/20150411140229'" 1>&2; false; fi on app.com
DEBUG[9a60b6ea] Command: if test ! -d /var/www/app/releases/20150411140229; then echo "Directory does not exist '/var/www/app/releases/20150411140229'" 1>&2; false; fi
DEBUG[9a60b6ea] Finished in 0.252 seconds with exit status 0 (successful).
INFO[926b14e1] Running ~/.rvm/bin/rvm 2.2.0#gemset do bundle exec rake assets:precompile on app.com
DEBUG[926b14e1] Command: cd /var/www/app/releases/20150411140229 && ( RAILS_ENV=production ~/.rvm/bin/rvm 2.2.0#gemset do bundle exec rake assets:precompile )
DEBUG[926b14e1] I, [2015-04-11T14:02:51.203678 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/apple-touch-icon-114x114-precomposed-305f00ea8c7d006b84bb4fae81f9560f.png
DEBUG[926b14e1] I, [2015-04-11T14:02:51.230319 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/projects/project-item-engine-rails-879f2b31347734136f7381f19bb9f6a3.png
DEBUG[926b14e1] I, [2015-04-11T14:02:51.233698 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/projects/projects-list-header-57d1dcc1cc60e2eb39438cb1845a9aa2.jpg
DEBUG[926b14e1] I, [2015-04-11T14:02:51.236956 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/rails-31b23f13156504238438fdd89afe6fd6.png
DEBUG[926b14e1] I, [2015-04-11T14:02:51.237889 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/sprites/blog-color-fd3e21aa29714c4881b34b34b4980ba9.png
DEBUG[926b14e1] I, [2015-04-11T14:02:51.284081 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/application-659c280b13b0f592813748b6abb50b74.js
DEBUG[926b14e1] I, [2015-04-11T14:02:51.311349 #18205] INFO -- : Writing /var/www/app/releases/20150411140229/public/assets/front-9b21c4b4182f885f99929c6f71639a44.js
DEBUG[926b14e1] rake aborted!
DEBUG[926b14e1] Sass::SyntaxError: Undefined mixin 'sprites-sprite'.
DEBUG[926b14e1] (in /var/www/app/releases/20150411140229/app/assets/stylesheets/static.css.scss:96)
DEBUG[926b14e1] /var/www/app/releases/20150411140229/app/assets/stylesheets/static.css.scss:96:in `sprites-sprite'
DEBUG[926b14e1] /var/www/app/releases/20150411140229/app/assets/stylesheets/static.css.scss:96
DEBUG[926b14e1] /var/www/app/shared/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:253:in `visit_mixin'
DEBUG[926b14e1] /var/www/app/shared/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `visit'
I think that problem is in placing gems. First line of log telling me that all gems in /var/www/app/shared/bundle and it's truth — they are really there. But if I run rvm 2.2.0#gemset do gem list as deploy user I don't see installed gems in list:
deployer#server:/var/www/app/current$ rvm 2.2.0#gemset do gem list
*** LOCAL GEMS ***
bigdecimal (1.2.6)
bundler (1.8.4)
bundler-unload (1.0.2)
executable-hooks (1.3.2)
gem-wrappers (1.2.7)
io-console (0.4.3)
json (1.8.1)
minitest (5.4.3)
power_assert (0.2.2)
psych (2.0.8)
rake (10.4.2)
rdoc (4.2.0)
rubygems-bundler (1.4.4)
rvm (1.11.3.9)
test-unit (3.0.8)
And when I run bundle from app's folder I can see a full list of installed gems:
deployer#server:/var/www/app/current$ bundle
Using rake 10.4.2
Using sass 3.2.19
Using bootstrap-sass 3.1.1.1
Using compass 0.12.7
Using breakpoint 2.0.7
Using compass-rails 2.0.0
Using sprockets 2.11.0
Using sprockets-rails 2.2.2
/* removed some lines to save space */
Using rails 4.1.8
Using sass-rails 4.0.3
Using uglifier 2.5.0
Using unicorn 4.8.3
Bundle complete! 39 Gemfile dependencies, 87 gems now installed.
Gems in the groups development and test were not installed.
Bundled gems are installed into /var/www/app/shared/bundle.
I use rvm for development and production in single-user mode and some my files here:
# deploy.rb
lock '3.2.1'
set :application, 'App'
set :repo_url, 'git#bitbucket.org:app/app.com.git'
set :deploy_to, '/var/www/app'
set :rvm_ruby_version, '2.2.0#gemset'
set :unicorn_env, 'production'
set :rails_env, :production
set :linked_files, %w{config/database.yml config/secrets.yml config/scp.yml}
set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}
namespace :deploy do
desc 'Restart application'
task :restart do
invoke 'unicorn:restart'
end
after :restart, :clear_cache do
on roles(:web), in: :groups, limit: 3, wait: 10 do
end
end
after :publishing, :restart
end
Capfile
# Capfile
require 'capistrano/setup'
require 'capistrano/deploy'
require 'capistrano3/unicorn'
require 'whenever/capistrano'
require 'capistrano/rvm'
require 'capistrano/bundler'
require 'capistrano/rails'
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
Front.css.scss set as precompiled in application.rb
# front.css.scss
#import "compass";
#import "compass/utilities/sprites";
#import "sprites/*.png";
#include all-sprites-sprites;
#import "breakpoint";
$breakpoint-tiny : 0 660px;
#import "static";
And for example static.css.scss:
/* static.css.scss */
.blog {
#include sprites-sprite(blog-gray);
&:hover {
#include sprites-sprite(blog-color);
}
}
If I remove all mixins from static.css.scss deploy will finished successfully.

Answer 1

I solved the problem, it wasn't related to capistrano or even rvm.
I use two layouts for my app: front.html.slim and admin.html.slim, each with a dedicated stylesheet: front.css and admin.css.
In front.css.scss I was using the following (sass) syntax:
#import "compass";
#import "compass/utilities/sprites";
While admin.css.scss used Sprocket's syntax:
/*
*= require base
*= require posts
*= require projects
The assets:precompile task finished successfully after I changed admin.css.scss to actual sass syntax:
#import "base";
#import "posts";
#import "projects";
Thanx #RAJ for your advice.