gitlab-org--gitlab-foss/lib/gitlab/ee_compat_check.rb
2018-01-11 16:34:01 +00:00

394 lines
12 KiB
Ruby

# rubocop: disable Rails/Output
module Gitlab
# Checks if a set of migrations requires downtime or not.
class EeCompatCheck
DEFAULT_CE_PROJECT_URL = 'https://gitlab.com/gitlab-org/gitlab-ce'.freeze
EE_REPO_URL = 'https://gitlab.com/gitlab-org/gitlab-ee.git'.freeze
CHECK_DIR = Rails.root.join('ee_compat_check')
IGNORED_FILES_REGEX = /(VERSION|CHANGELOG\.md:\d+)/.freeze
PLEASE_READ_THIS_BANNER = %Q{
============================================================
===================== PLEASE READ THIS =====================
============================================================
}.freeze
THANKS_FOR_READING_BANNER = %Q{
============================================================
==================== THANKS FOR READING ====================
============================================================\n
}.freeze
attr_reader :ee_repo_dir, :patches_dir, :ce_project_url, :ce_repo_url, :ce_branch, :ee_branch_found
attr_reader :job_id, :failed_files
def initialize(branch:, ce_project_url: DEFAULT_CE_PROJECT_URL, job_id: nil)
@ee_repo_dir = CHECK_DIR.join('ee-repo')
@patches_dir = CHECK_DIR.join('patches')
@ce_branch = branch
@ce_project_url = ce_project_url
@ce_repo_url = "#{ce_project_url}.git"
@job_id = job_id
end
def check
ensure_patches_dir
add_remote('canonical-ce', "#{DEFAULT_CE_PROJECT_URL}.git")
generate_patch(branch: ce_branch, patch_path: ce_patch_full_path, remote: 'canonical-ce')
ensure_ee_repo
Dir.chdir(ee_repo_dir) do
step("In the #{ee_repo_dir} directory")
add_remote('canonical-ee', EE_REPO_URL)
status = catch(:halt_check) do
ce_branch_compat_check!
delete_ee_branches_locally!
ee_branch_presence_check!
step("Checking out #{ee_branch_found}", %W[git checkout -b #{ee_branch_found} canonical-ee/#{ee_branch_found}])
generate_patch(branch: ee_branch_found, patch_path: ee_patch_full_path, remote: 'canonical-ee')
ee_branch_compat_check!
end
delete_ee_branches_locally!
if status.nil?
true
else
false
end
end
end
private
def add_remote(name, url)
step(
"Adding the #{name} remote (#{url})",
%W[git remote add #{name} #{url}]
)
end
def ensure_ee_repo
if Dir.exist?(ee_repo_dir)
step("#{ee_repo_dir} already exists")
else
step(
"Cloning #{EE_REPO_URL} into #{ee_repo_dir}",
%W[git clone --branch master --single-branch --depth=200 #{EE_REPO_URL} #{ee_repo_dir}]
)
end
end
def ensure_patches_dir
FileUtils.mkdir_p(patches_dir)
end
def generate_patch(branch:, patch_path:, remote:)
FileUtils.rm(patch_path, force: true)
find_merge_base_with_master(branch: branch, master_remote: remote)
step(
"Generating the patch against #{remote}/master in #{patch_path}",
%W[git diff --binary #{remote}/master...origin/#{branch}]
) do |output, status|
throw(:halt_check, :ko) unless status.zero?
File.write(patch_path, output)
throw(:halt_check, :ko) unless File.exist?(patch_path)
end
end
def ce_branch_compat_check!
if check_patch(ce_patch_full_path).zero?
puts applies_cleanly_msg(ce_branch)
throw(:halt_check)
end
end
def ee_branch_presence_check!
_, status = step("Fetching origin/#{ee_branch_prefix}", %W[git fetch canonical-ee #{ee_branch_prefix}])
if status.zero?
@ee_branch_found = ee_branch_prefix
return
end
_, status = step("Fetching origin/#{ee_branch_suffix}", %W[git fetch canonical-ee #{ee_branch_suffix}])
if status.zero?
@ee_branch_found = ee_branch_suffix
else
puts
puts ce_branch_doesnt_apply_cleanly_and_no_ee_branch_msg
throw(:halt_check, :ko)
end
end
def ee_branch_compat_check!
unless check_patch(ee_patch_full_path).zero?
puts
puts ee_branch_doesnt_apply_cleanly_msg
throw(:halt_check, :ko)
end
puts
puts applies_cleanly_msg(ee_branch_found)
end
def check_patch(patch_path)
step("Checking out master", %w[git checkout master])
step("Resetting to latest master", %w[git reset --hard canonical-ee/master])
step(
"Checking if #{patch_path} applies cleanly to EE/master",
# Don't use --check here because it can result in a 0-exit status even
# though the patch doesn't apply cleanly, e.g.:
# > git apply --check --3way foo.patch
# error: patch failed: lib/gitlab/ee_compat_check.rb:74
# Falling back to three-way merge...
# Applied patch to 'lib/gitlab/ee_compat_check.rb' with conflicts.
# > echo $?
# 0
%W[git apply --3way #{patch_path}]
) do |output, status|
puts output
unless status.zero?
@failed_files = output.lines.reduce([]) do |memo, line|
if line.start_with?('error: patch failed:')
file = line.sub(/\Aerror: patch failed: /, '')
memo << file unless file =~ IGNORED_FILES_REGEX
end
memo
end
status = 0 if failed_files.empty?
end
command(%w[git reset --hard])
status
end
end
def delete_ee_branches_locally!
command(%w[git checkout master])
command(%W[git branch --delete --force #{ee_branch_prefix}])
command(%W[git branch --delete --force #{ee_branch_suffix}])
end
def merge_base_found?(master_remote:, branch:)
step(
"Finding merge base with #{master_remote}/master",
%W[git merge-base #{master_remote}/master origin/#{branch}]
) do |output, status|
if status.zero?
puts "Merge base was found: #{output}"
true
end
end
end
def find_merge_base_with_master(branch:, master_remote:)
# Start with (Math.exp(3).to_i = 20) until (Math.exp(6).to_i = 403)
# In total we go (20 + 54 + 148 + 403 = 625) commits deeper
depth = 20
success =
(3..6).any? do |factor|
depth += Math.exp(factor).to_i
# Repository is initially cloned with a depth of 20 so we need to fetch
# deeper in the case the branch has more than 20 commits on top of master
fetch(branch: branch, depth: depth, remote: 'origin')
fetch(branch: 'master', depth: depth, remote: master_remote)
merge_base_found?(master_remote: master_remote, branch: branch)
end
raise "\n#{branch} is too far behind #{master_remote}/master, please rebase it!\n" unless success
end
def fetch(branch:, depth:, remote: 'origin')
step(
"Fetching deeper...",
%W[git fetch --depth=#{depth} --prune #{remote} +refs/heads/#{branch}:refs/remotes/#{remote}/#{branch}]
) do |output, status|
raise "Fetch failed: #{output}" unless status.zero?
end
end
def ce_patch_name
@ce_patch_name ||= patch_name_from_branch(ce_branch)
end
def ce_patch_full_path
@ce_patch_full_path ||= patches_dir.join(ce_patch_name)
end
def ee_branch_suffix
@ee_branch_suffix ||= "#{ce_branch}-ee"
end
def ee_branch_prefix
@ee_branch_prefix ||= "ee-#{ce_branch}"
end
def ee_patch_name
@ee_patch_name ||= patch_name_from_branch(ee_branch_found)
end
def ee_patch_full_path
@ee_patch_full_path ||= patches_dir.join(ee_patch_name)
end
def patch_name_from_branch(branch_name)
branch_name.parameterize << '.patch'
end
def patch_url
"#{ce_project_url}/-/jobs/#{job_id}/artifacts/raw/ee_compat_check/patches/#{ce_patch_name}"
end
def step(desc, cmd = nil)
puts "\n=> #{desc}\n"
if cmd
start = Time.now
puts "\n$ #{cmd.join(' ')}"
output, status = command(cmd)
puts "\n==> Finished in #{Time.now - start} seconds"
if block_given?
yield(output, status)
else
[output, status]
end
end
end
def command(cmd)
Gitlab::Popen.popen(cmd)
end
def applies_cleanly_msg(branch)
%Q{
#{PLEASE_READ_THIS_BANNER}
🎉 Congratulations!! 🎉
The `#{branch}` branch applies cleanly to EE/master!
Much ❤️! For more information, see
https://docs.gitlab.com/ce/development/automatic_ce_ee_merge.html
#{THANKS_FOR_READING_BANNER}
}
end
def ce_branch_doesnt_apply_cleanly_and_no_ee_branch_msg
%Q{
#{PLEASE_READ_THIS_BANNER}
💥 Oh no! 💥
The `#{ce_branch}` branch does not apply cleanly to the current
EE/master, and no `#{ee_branch_prefix}` or `#{ee_branch_suffix}` branch
was found in the EE repository.
If you're a community contributor, don't worry, someone from
GitLab Inc. will take care of this, and you don't have to do anything.
If you're willing to help, and are ok to contribute to EE as well,
you're welcome to help. You could follow the instructions below.
#{conflicting_files_msg}
We advise you to create a `#{ee_branch_prefix}` or `#{ee_branch_suffix}`
branch that includes changes from `#{ce_branch}` but also specific changes
than can be applied cleanly to EE/master. In some cases, the conflicts
are trivial and you can ignore the warning from this job. As always,
use your best judgement!
There are different ways to create such branch:
1. Create a new branch from master and cherry-pick your CE commits
# In the EE repo
$ git fetch #{EE_REPO_URL} master
$ git checkout -b #{ee_branch_prefix} FETCH_HEAD
$ git fetch #{ce_repo_url} #{ce_branch}
$ git cherry-pick SHA # Repeat for all the commits you want to pick
You can squash the `#{ce_branch}` commits into a single "Port of #{ce_branch} to EE" commit.
2. Apply your branch's patch to EE
# In the EE repo
$ git fetch #{EE_REPO_URL} master
$ git checkout -b #{ee_branch_prefix} FETCH_HEAD
$ wget #{patch_url} && git apply --3way #{ce_patch_name}
At this point you might have conflicts such as:
error: patch failed: lib/gitlab/ee_compat_check.rb:5
Falling back to three-way merge...
Applied patch to 'lib/gitlab/ee_compat_check.rb' with conflicts.
U lib/gitlab/ee_compat_check.rb
Resolve them, stage the changes and commit them.
If the patch couldn't be applied cleanly, use the following command:
# In the EE repo
$ git apply --reject #{ce_patch_name}
This option makes git apply the parts of the patch that are applicable,
and leave the rejected hunks in corresponding `.rej` files.
You can then resolve the conflicts highlighted in `.rej` by
manually applying the correct diff from the `.rej` file to the file with conflicts.
When finished, you can delete the `.rej` files and commit your changes.
⚠️ Don't forget to push your branch to gitlab-ee:
# In the EE repo
$ git push origin #{ee_branch_prefix}
⚠️ Also, don't forget to create a new merge request on gitlab-ee and
cross-link it with the CE merge request.
Once this is done, you can retry this failed build, and it should pass.
Stay 💪 ! For more information, see
https://docs.gitlab.com/ce/development/automatic_ce_ee_merge.html
#{THANKS_FOR_READING_BANNER}
}
end
def ee_branch_doesnt_apply_cleanly_msg
%Q{
#{PLEASE_READ_THIS_BANNER}
💥 Oh no! 💥
The `#{ce_branch}` does not apply cleanly to the current EE/master, and
even though a `#{ee_branch_found}` branch
exists in the EE repository, it does not apply cleanly either to
EE/master!
#{conflicting_files_msg}
Please update the `#{ee_branch_found}`, push it again to gitlab-ee, and
retry this build.
Stay 💪 ! For more information, see
https://docs.gitlab.com/ce/development/automatic_ce_ee_merge.html
#{THANKS_FOR_READING_BANNER}
}
end
def conflicting_files_msg
failed_files.reduce("The conflicts detected were as follows:\n") do |memo, file|
memo << "\n - #{file}"
end
end
end
end