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#!/usr/bin/env ruby
# frozen_string_literal: true
require 'open3'
class MigrationSchemaValidator
FILENAME = 'db/structure.sql'
MIGRATION_DIRS = %w[db/migrate db/post_migrate].freeze
SCHEMA_VERSION_DIR = 'db/schema_migrations'
VERSION_DIGITS = 14
def validate!
if committed_migrations.empty?
puts "\e[32m No migrations found, skipping schema validation\e[0m"
return
end
validate_schema_on_rollback!
validate_schema_on_migrate!
validate_schema_version_files!
end
private
def validate_schema_on_rollback!
committed_migrations.reverse_each do |filename|
version = find_migration_version(filename)
run("bin/rails db:migrate:down VERSION=#{version}")
end
git_command = "git diff #{diff_target} -- #{FILENAME}"
base_message = "rollback of added migrations does not revert #{FILENAME} to previous state"
validate_clean_output!(git_command, base_message)
end
def validate_schema_on_migrate!
run('bin/rails db:migrate')
git_command = "git diff -- #{FILENAME}"
base_message = "the committed #{FILENAME} does not match the one generated by running added migrations"
validate_clean_output!(git_command, base_message)
end
def validate_schema_version_files!
git_command = "git add -A -n #{SCHEMA_VERSION_DIR}"
base_message = "the committed files in #{SCHEMA_VERSION_DIR} do not match those expected by the added migrations"
validate_clean_output!(git_command, base_message)
end
def committed_migrations
@committed_migrations ||= begin
git_command = "git diff --name-only --diff-filter=A #{diff_target} -- #{MIGRATION_DIRS.join(' ')}"
run(git_command).split("\n")
end
end
def diff_target
@diff_target ||= pipeline_for_merged_results? ? target_branch : merge_base
end
def merge_base
run("git merge-base #{target_branch} #{source_ref}")
end
def target_branch
ENV['CI_MERGE_REQUEST_TARGET_BRANCH_NAME'] || ENV['TARGET'] || ENV['CI_DEFAULT_BRANCH'] || 'master'
end
def source_ref
ENV['CI_COMMIT_SHA'] || 'HEAD'
end
def pipeline_for_merged_results?
ENV.key?('CI_MERGE_REQUEST_SOURCE_BRANCH_SHA')
end
def find_migration_version(filename)
file_basename = File.basename(filename)
version_match = /\A(?<version>\d{#{VERSION_DIGITS}})_/.match(file_basename)
die "#{filename} has an invalid migration version" if version_match.nil?
version_match[:version]
end
def validate_clean_output!(command, base_message)
command_output = run(command)
return if command_output.empty?
die "#{base_message}:\n#{command_output}"
end
def die(message, error_code: 1)
puts "\e[31mError: #{message}\e[0m"
exit error_code
end
def run(cmd)
puts "\e[32m$ #{cmd}\e[37m"
stdout_str, stderr_str, status = Open3.capture3(cmd)
puts "#{stdout_str}#{stderr_str}\e[0m"
die "command failed: #{stderr_str}" unless status.success?
stdout_str.chomp
end
end
MigrationSchemaValidator.new.validate!
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