debian-mirror-gitlab/scripts/regenerate-schema

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#!/usr/bin/env ruby
# frozen_string_literal: true
require 'open3'
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require 'fileutils'
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require 'uri'
class SchemaRegenerator
##
# Filename of the schema
#
# This file is being regenerated by this script.
FILENAME = 'db/structure.sql'
##
# Directories where migrations are stored
#
# The methods +hide_migrations+ and +unhide_migrations+ will rename
# these to disable/enable migrations.
MIGRATION_DIRS = %w[db/migrate db/post_migrate].freeze
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##
# Directory where we store schema versions
#
# The remove_schema_migration_files removes files added in this
# directory when it runs.
SCHEMA_MIGRATIONS_DIR = 'db/schema_migrations/'
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def execute
Dir.chdir(File.expand_path('..', __dir__)) do
checkout_ref
checkout_clean_schema
hide_migrations
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remove_schema_migration_files
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stop_spring
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reset_db
unhide_migrations
migrate
ensure
unhide_migrations
end
end
private
##
# Git checkout +CI_COMMIT_SHA+.
#
# When running from CI, checkout the clean commit,
# not the merged result.
def checkout_ref
return unless ci?
run %Q[git checkout #{source_ref}]
run %q[git clean -f -- db]
end
##
# Checkout the clean schema from the target branch
def checkout_clean_schema
remote_checkout_clean_schema || local_checkout_clean_schema
end
##
# Get clean schema from remote servers
#
# This script might run in CI, using a shallow clone, so to checkout
# the file, fetch the target branch from the server.
def remote_checkout_clean_schema
return false unless project_url
return false unless target_project_url
run %Q[git remote add target_project #{target_project_url}.git]
run %Q[git fetch target_project #{target_branch}:#{target_branch}]
local_checkout_clean_schema
end
##
# Git checkout the schema from target branch.
#
# Ask git to checkout the schema from the target branch and reset
# the file to unstage the changes.
def local_checkout_clean_schema
run %Q[git checkout #{merge_base} -- #{FILENAME}]
run %Q[git reset -- #{FILENAME}]
end
##
# Move migrations to where Rails will not find them.
#
# To reset the database to clean schema defined in +FILENAME+, move
# the migrations to a path where Rails will not find them, otherwise
# +db:reset+ would abort. Later when the migrations should be
# applied, use +unhide_migrations+ to bring them back.
def hide_migrations
MIGRATION_DIRS.each do |dir|
File.rename(dir, "#{dir}__")
end
end
##
# Undo the effect of +hide_migrations+.
#
# Place back the migrations which might be moved by
# +hide_migrations+.
def unhide_migrations
error = nil
MIGRATION_DIRS.each do |dir|
File.rename("#{dir}__", dir)
rescue Errno::ENOENT
nil
rescue StandardError => e
# Save error for later, but continue with other dirs first
error = e
end
raise error if error
end
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##
# Remove files added to db/schema_migrations
#
# In order to properly reset the database and re-run migrations
# the schema migrations for new migrations must be removed.
def remove_schema_migration_files
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(untracked_schema_migrations + committed_schema_migrations).each do |schema_migration|
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FileUtils.rm(schema_migration)
end
end
##
# List of untracked schema migrations
#
# Get a list of schema migrations that are not tracked so we can remove them
def untracked_schema_migrations
git_command = "git ls-files --others --exclude-standard -- #{SCHEMA_MIGRATIONS_DIR}"
run(git_command).chomp.split("\n")
end
##
# List of untracked schema migrations
#
# Get a list of schema migrations that have been committed since the last
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def committed_schema_migrations
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git_command = "git diff --name-only --diff-filter=A #{merge_base} -- #{SCHEMA_MIGRATIONS_DIR}"
run(git_command).chomp.split("\n")
end
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##
# Stop spring before modifying the database
def stop_spring
run %q[bin/spring stop]
end
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##
# Run rake task to reset the database.
def reset_db
run %q[bin/rails db:reset RAILS_ENV=test]
end
##
# Run rake task to run migrations.
def migrate
run %q[bin/rails db:migrate RAILS_ENV=test]
end
##
# Run the given +cmd+.
#
# The command is colored green, and the output of the command is
# colored gray.
# When the command failed an exception is raised.
def run(cmd)
puts "\e[32m$ #{cmd}\e[37m"
stdout_str, stderr_str, status = Open3.capture3(cmd)
puts "#{stdout_str}#{stderr_str}\e[0m"
raise("Command failed: #{stderr_str}") unless status.success?
stdout_str
end
##
# Return the base commit between source and target branch.
def merge_base
@merge_base ||= run("git merge-base #{target_branch} #{source_ref}").chomp
end
##
# Return the name of the target branch
#
# Get source ref from CI environment variable, or read the +TARGET+
# environment+ variable, or default to +HEAD+.
def target_branch
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ENV['CI_MERGE_REQUEST_TARGET_BRANCH_NAME'] || ENV['TARGET'] || ENV['CI_DEFAULT_BRANCH'] || 'master'
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end
##
# Return the source ref
#
# Get source ref from CI environment variable, or default to +HEAD+.
def source_ref
ENV['CI_COMMIT_SHA'] || 'HEAD'
end
##
# Return the source project URL from CI environment variable.
def project_url
ENV['CI_PROJECT_URL']
end
##
# Return the target project URL from CI environment variable.
def target_project_url
ENV['CI_MERGE_REQUEST_PROJECT_URL']
end
##
# Return whether the script is running from CI
def ci?
ENV['CI']
end
end
SchemaRegenerator.new.execute