Bug report: Docker file generation for rails app

1

I got this error when running fly deploy after running fly launch:

Error: failed to fetch an image or build from source: error building: failed to solve: failed to solve with frontend dockerfile.v0: failed to solve with frontend gateway.v0: rpc error: code = Unknown desc = dockerfile parse error on line 27: unknown instruction: rm (did you mean from?)

This is line 27 from the Dockerfile

# Install Node.js
    rm -rf /tmp/node-build-master

This made it run without errors

# Install Node.js
RUN rm -rf /tmp/node-build-master
2

So I can reproduce this, can you provide me with your Gemfile and the output of node -v?

3

Here is my gem file:

source "https://rubygems.org"
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby "3.1.2"

gem "rails",                      "7.0.4"
gem "image_processing",           "1.12.2"
gem "active_storage_validations", "0.9.8"
gem "bcrypt",                     "3.1.18"
gem "faker",                      "2.21.0"
gem "will_paginate",              "3.3.1"
gem "bootstrap-will_paginate",    "1.0.0"
gem "bootstrap-sass",             "3.4.1"
gem "sassc-rails",                "2.1.2"
gem "sprockets-rails",            "3.4.2"
gem "importmap-rails",            "1.1.0"
gem "turbo-rails",                "1.1.1"
gem "stimulus-rails",             "1.0.4"
gem "jbuilder",                   "2.11.5"
gem "puma",                       "5.6.4"
gem "bootsnap",                   "1.12.0", require: false

group :development, :test do
  gem "sqlite3", "1.4.2"
  gem "debug",   "1.5.0", platforms: %i[ mri mingw x64_mingw ]
end

group :development do
  gem "web-console", "4.2.0"
end

group :test do
  gem "capybara",                 "3.37.1"
  gem "selenium-webdriver",       "4.2.0"
  gem "webdrivers",               "5.0.0"
  gem "rails-controller-testing", "1.0.5"
  gem "minitest",                 "5.15.0"
  gem "minitest-reporters",       "1.5.0"
  gem "guard",                    "2.18.0"
  gem "guard-minitest",           "2.4.6"
end

group :production do
  gem "pg",         "1.3.5"
  gem "aws-sdk-s3", "1.114.0", require: false
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem.
# Uncomment the following line if you're running Rails
# on a native Windows system:
# gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ]
gem "dockerfile-rails", ">= 1.5", :group => :development

gem "sentry-ruby", "~> 5.11"

I’m working on a project to teach me how to use rails, so there is no javascript in my project right now.
node -v returns:
command not found: node

4

I’ve pushed out a fix in dockerfile-rails v1.5.6. Please try:

bundle update
bin/rails generate dockerfile

The dockerfile generated will have a number of changes (mostly deletions) as compared to the previous one. Let me know if this Dockerfile works for your application.

5

That worked for me thanks!

6

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