Module: Dependabot::SharedHelpers

Extended by:
T::Sig
Defined in:
lib/dependabot/shared_helpers.rb

Overview

rubocop:disable Metrics/ModuleLength

Defined Under Namespace

Classes: HelperSubprocessFailed

Constant Summary collapse

USER_AGENT = 
T.let(
  "dependabot-core/#{Dependabot::VERSION} " \
  "#{Excon::USER_AGENT} ruby/#{RUBY_VERSION} " \
  "(#{RUBY_PLATFORM}) " \
  "(+https://github.com/dependabot/dependabot-core)".freeze,
  String
)
SIGKILL = 
9

Class Method Summary collapse

Class Method Details

.check_out_of_disk_memory_error(stderr, error_context) ⇒ Object 



515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
 
# File 'lib/dependabot/shared_helpers.rb', line 515

def self.check_out_of_disk_memory_error(stderr, error_context)
  if stderr&.include?("No space left on device") || stderr&.include?("Out of diskspace")
    raise HelperSubprocessFailed.new(
      message: "No space left on device",
      error_class: "Dependabot::OutOfDisk",
      error_context: error_context
    )
  elsif stderr&.include?("MemoryError")
    raise HelperSubprocessFailed.new(
      message: "MemoryError",
      error_class: "Dependabot::OutOfMemory",
      error_context: error_context
    )
  end
end

.check_out_of_memory_error(stderr, error_context, error_class) ⇒ Object

Raises:

  • (error_class) 


249
250
251
252
253
254
255
256
257
 
# File 'lib/dependabot/shared_helpers.rb', line 249

def self.check_out_of_memory_error(stderr, error_context, error_class)
  return unless stderr&.include?("JavaScript heap out of memory")

  raise error_class.new(
    message: "JavaScript heap out of memory",
    error_class: "Dependabot::OutOfMemoryError",
    error_context: error_context
  )
end

.configure_git_to_use_https(host) ⇒ Object 



407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
 
# File 'lib/dependabot/shared_helpers.rb', line 407

def self.configure_git_to_use_https(host)
  # NOTE: we use --global here (rather than --system) so that Dependabot
  # can be run without privileged access
  run_shell_command(
    "git config --global --replace-all url.https://#{host}/." \
    "insteadOf ssh://git@#{host}/"
  )
  run_shell_command(
    "git config --global --add url.https://#{host}/." \
    "insteadOf ssh://git@#{host}:"
  )
  run_shell_command(
    "git config --global --add url.https://#{host}/." \
    "insteadOf git@#{host}:"
  )
  run_shell_command(
    "git config --global --add url.https://#{host}/." \
    "insteadOf git@#{host}/"
  )
  run_shell_command(
    "git config --global --add url.https://#{host}/." \
    "insteadOf git://#{host}/"
  )
end

.configure_git_to_use_https_with_credentials(credentials, safe_directories, git_config_global_path) ⇒ Object 



345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
 
# File 'lib/dependabot/shared_helpers.rb', line 345

def self.configure_git_to_use_https_with_credentials(credentials, safe_directories, git_config_global_path)
  File.open(git_config_global_path, "w") do |file|
    file << "# Generated by dependabot/dependabot-core"
  end

  # Then add a file-based credential store that loads a file in this repo.
  # Under the hood this uses git credential-store, but it's invoked through
  # a wrapper binary that only allows non-mutating commands. Without this,
  # whenever the credentials are deemed to be invalid, they're erased.
  run_shell_command(
    "git config --global credential.helper " \
    "'!#{credential_helper_path} --file #{Dir.pwd}/git.store'",
    allow_unsafe_shell_command: true,
    fingerprint: "git config --global credential.helper '<helper_command>'"
  )

  # see https://github.blog/2022-04-12-git-security-vulnerability-announced/
  safe_directories.each do |path|
    run_shell_command("git config --global --add safe.directory #{path}")
  end

  github_credentials = credentials
                       .select { |c| c["type"] == "git_source" }
                       .select { |c| c["host"] == "github.com" }
                       .select { |c| c["password"] && c["username"] }

  # If multiple credentials are specified for github.com, pick the one that
  # *isn't* just an app token (since it must have been added deliberately)
  github_credential =
    github_credentials.find { |c| !c["password"]&.start_with?("v1.") } ||
    github_credentials.first

  # Make sure we always have https alternatives for github.com.
  configure_git_to_use_https("github.com") if github_credential.nil?

  deduped_credentials = credentials -
                        github_credentials +
                        [github_credential].compact

  # Build the content for our credentials file
  git_store_content = ""
  deduped_credentials.each do |cred|
    next unless cred["type"] == "git_source"
    next unless cred["host"]

    has_creds = cred["username"] && cred["password"]

    # Build authenticated URL with credentials if available
    creds = has_creds ? "#{cred.fetch('username')}:#{cred.fetch('password')}@" : ""
    authenticated_url = "https://#{creds}#{cred.fetch('host')}"

    git_store_content += authenticated_url + "\n"
    configure_git_to_use_https(cred.fetch("host"))
  end

  # Save the file
  File.write("git.store", git_store_content)
end

.credential_helper_path ⇒ Object 



333
334
335
 
# File 'lib/dependabot/shared_helpers.rb', line 333

def self.credential_helper_path
  File.join(__dir__, "../../bin/git-credential-store-immutable")
end

.escape_command(command) ⇒ Object 



123
124
125
 
# File 'lib/dependabot/shared_helpers.rb', line 123

def self.escape_command(command)
  CommandHelpers.escape_command(command)
end

.excon_defaults(options = nil) ⇒ Object 



275
276
277
278
279
280
281
282
283
284
285
286
287
288
 
# File 'lib/dependabot/shared_helpers.rb', line 275

def self.excon_defaults(options = nil)
  options ||= {}
  headers = T.cast(options.delete(:headers), T.nilable(T::Hash[String, String]))
  {
    instrumentor: Dependabot::SimpleInstrumentor,
    connect_timeout: 5,
    write_timeout: 5,
    read_timeout: 20,
    retry_limit: 4, # Excon defaults to four retries, but let's set it explicitly for clarity
    omit_default_port: true,
    middlewares: excon_middleware,
    headers: excon_headers(headers)
  }.merge(options)
end

.excon_headers(headers = nil) ⇒ Object 



267
268
269
270
271
272
 
# File 'lib/dependabot/shared_helpers.rb', line 267

def self.excon_headers(headers = nil)
  headers ||= {}
  {
    "User-Agent" => USER_AGENT
  }.merge(headers)
end

.excon_middleware ⇒ Object 



260
261
262
263
264
 
# File 'lib/dependabot/shared_helpers.rb', line 260

def self.excon_middleware
  T.must(T.cast(Excon.defaults, T::Hash[Symbol, T::Array[T.class_of(Excon::Middleware::Base)]])[:middlewares]) +
    [Excon::Middleware::Decompress] +
    [Excon::Middleware::RedirectFollower]
end

.find_safe_directories ⇒ Object 



441
442
443
444
445
446
447
 
# File 'lib/dependabot/shared_helpers.rb', line 441

def self.find_safe_directories
  # to preserve safe directories from global .gitconfig
  output, process = Open3.capture2("git config --global --get-all safe.directory")
  safe_directories = []
  safe_directories = output.split("\n").compact if process.success?
  safe_directories
end

.handle_json_parse_error(stdout, stderr, error_context, error_class) ⇒ Object 



224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
 
# File 'lib/dependabot/shared_helpers.rb', line 224

def self.handle_json_parse_error(stdout, stderr, error_context, error_class)
  # If the JSON is invalid, the helper has likely failed
  # We should raise a more helpful error message
  message = if !stdout.strip.empty?
              stdout
            elsif !stderr.strip.empty?
              stderr
            else
              "No output from command"
            end
  error_class.new(
    message: message,
    error_class: "JSON::ParserError",
    error_context: error_context
  )
end

.in_a_temporary_directory(directory = "/", &_block) ⇒ Object 



73
74
75
76
77
78
79
80
81
82
83
84
85
 
# File 'lib/dependabot/shared_helpers.rb', line 73

def self.in_a_temporary_directory(directory = "/", &_block)
  FileUtils.mkdir_p(Utils::BUMP_TMP_DIR_PATH)
  tmp_dir = Dir.mktmpdir(Utils::BUMP_TMP_FILE_PREFIX, Utils::BUMP_TMP_DIR_PATH)
  path = Pathname.new(File.join(tmp_dir, directory)).expand_path

  begin
    path = Pathname.new(File.join(tmp_dir, directory)).expand_path
    FileUtils.mkpath(path)
    Dir.chdir(path) { yield(path) }
  ensure
    FileUtils.rm_rf(tmp_dir)
  end
end

.in_a_temporary_repo_directory(directory = "/", repo_contents_path = nil, &block) ⇒ Object 



44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/dependabot/shared_helpers.rb', line 44

def self.in_a_temporary_repo_directory(directory = "/", repo_contents_path = nil, &block)
  if repo_contents_path
    # If a workspace has been defined to allow orcestration of the git repo
    # by the runtime we should defer to it, otherwise we prepare the folder
    # for direct use and yield.
    if Dependabot::Workspace.active_workspace
      T.must(Dependabot::Workspace.active_workspace).change(&block)
    else
      path = Pathname.new(File.join(repo_contents_path, directory)).expand_path
      reset_git_repo(repo_contents_path)
      # Handle missing directories by creating an empty one and relying on the
      # file fetcher to raise a DependencyFileNotFound error
      FileUtils.mkdir_p(path)

      Dir.chdir(path) { yield(path) }
    end
  else
    in_a_temporary_directory(directory, &block)
  end
end

.reset_git_repo(path) ⇒ Object 



433
434
435
436
437
438
 
# File 'lib/dependabot/shared_helpers.rb', line 433

def self.reset_git_repo(path)
  Dir.chdir(path) do
    run_shell_command("git reset HEAD --hard")
    run_shell_command("git clean -fx")
  end
end

.run_helper_subprocess(command:, function:, args:, env: nil, stderr_to_stdout: false, allow_unsafe_shell_command: false, error_class: HelperSubprocessFailed, timeout: CommandHelpers::TIMEOUTS::DEFAULT) ⇒ Object 



142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
 
# File 'lib/dependabot/shared_helpers.rb', line 142

def self.run_helper_subprocess(
  command:,
  function:,
  args:,
  env: nil,
  stderr_to_stdout: false,
  allow_unsafe_shell_command: false,
  error_class: HelperSubprocessFailed,
  timeout: CommandHelpers::TIMEOUTS::DEFAULT
)
  start = Time.now
  stdin_data = JSON.dump(function: function, args: args)
  cmd = allow_unsafe_shell_command ? command : escape_command(command)

  # NOTE: For debugging native helpers in specs and dry-run: outputs the
  # bash command to run in the tmp directory created by
  # in_a_temporary_directory
  if ENV["DEBUG_FUNCTION"] == function
    puts helper_subprocess_bash_command(stdin_data: stdin_data, command: cmd, env: env)
    # Pause execution so we can run helpers inside the temporary directory
    T.unsafe(self).debugger
  end

  env_cmd = [env, cmd].compact
  raw_stdout, raw_stderr, process = CommandHelpers.capture3_with_timeout(
    env_cmd,
    stdin_data: stdin_data,
    timeout: timeout
  )
  stdout = T.let(raw_stdout || "", String)
  stderr = T.let(raw_stderr || "", String)
  time_taken = Time.now - start

  if ENV["DEBUG_HELPERS"] == "true"
    sanitized_env_cmd = [sanitize_env_for_logging(env), cmd].compact
    puts sanitized_env_cmd
    puts function
    puts stdout
    puts stderr
  end

  # Some package managers output useful stuff to stderr instead of stdout so
  # we want to parse this, most package manager will output garbage here so
  # would mess up json response from stdout
  stdout = "#{stderr}\n#{stdout}" if stderr_to_stdout

  error_context = {
    command: command,
    function: function,
    args: args,
    time_taken: time_taken,
    stderr_output: stderr[0..50_000], # Truncate to ~100kb
    process_exit_value: process.to_s,
    process_termsig: process&.termsig
  }

  check_out_of_memory_error(stderr, error_context, error_class)

  begin
    response = JSON.parse(stdout)
    return response["result"] if process&.success?

    raise error_class.new(
      message: response["error"],
      error_class: response["error_class"],
      error_context: error_context,
      trace: response["trace"]
    )
  rescue JSON::ParserError
    raise handle_json_parse_error(stdout, stderr, error_context, error_class)
  end
end

.run_shell_command(command, allow_unsafe_shell_command: false, cwd: nil, env: {}, fingerprint: nil, stderr_to_stdout: true, timeout: CommandHelpers::TIMEOUTS::DEFAULT, output_observer: nil) ⇒ Object

Raises:



462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
 
# File 'lib/dependabot/shared_helpers.rb', line 462

def self.run_shell_command(
  command,
  allow_unsafe_shell_command: false,
  cwd: nil,
  env: {},
  fingerprint: nil,
  stderr_to_stdout: true,
  timeout: CommandHelpers::TIMEOUTS::DEFAULT,
  output_observer: nil
)
  start = Time.now
  cmd = allow_unsafe_shell_command ? command : escape_command(command)

  puts cmd if ENV["DEBUG_HELPERS"] == "true"

  opts = {}
  opts[:chdir] = cwd if cwd

  env_cmd = [env || {}, cmd, opts].compact
  kwargs = {
    stderr_to_stdout: stderr_to_stdout,
    timeout: timeout
  }
  kwargs[:output_observer] = output_observer if output_observer

  stdout, stderr, process = CommandHelpers.capture3_with_timeout(
    env_cmd,
    **kwargs
  )

  time_taken = Time.now - start

  # Raise an error with the output from the shell session if the
  # command returns a non-zero status
  return stdout || "" if process&.success?

  error_context = {
    command: cmd,
    fingerprint: fingerprint,
    time_taken: time_taken,
    process_exit_value: process.to_s
  }

  check_out_of_disk_memory_error(stderr, error_context)

  raise SharedHelpers::HelperSubprocessFailed.new(
    message: stderr_to_stdout ? (stdout || "") : "#{stderr}\n#{stdout}",
    error_context: error_context
  )
end

.sanitize_env_for_logging(env) ⇒ Object 



540
541
542
543
544
545
546
547
548
549
550
551
 
# File 'lib/dependabot/shared_helpers.rb', line 540

def self.sanitize_env_for_logging(env)
  return nil if env.nil?

  env.transform_keys(&:to_s).each_with_object({}) do |(key, value), result|
    # Only redact if the key contains "TOKEN" (case-insensitive)
    result[key] = if key.match?(/TOKEN/i)
                    "<redacted>"
                  else
                    value
                  end
  end
end

.scp_to_standard(uri) ⇒ Object 



326
327
328
329
330
 
# File 'lib/dependabot/shared_helpers.rb', line 326

def self.scp_to_standard(uri)
  return uri unless uri.start_with?("git@")

  "https://#{T.must(uri.split('git@').last).sub(%r{:/?}, '/')}"
end

.with_git_configured(credentials:, &_block) ⇒ Object 



298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
 
# File 'lib/dependabot/shared_helpers.rb', line 298

def self.with_git_configured(credentials:, &_block)
  safe_directories = find_safe_directories

  FileUtils.mkdir_p(Utils::BUMP_TMP_DIR_PATH)

  previous_config = ENV.fetch("GIT_CONFIG_GLOBAL", nil)
  # adding a random suffix to avoid conflicts when running in parallel
  # some package managers like bundler will modify the global git config
  git_config_global_path = File.expand_path("#{SecureRandom.hex(16)}.gitconfig", Utils::BUMP_TMP_DIR_PATH)
  previous_terminal_prompt = ENV.fetch("GIT_TERMINAL_PROMPT", nil)

  begin
    ENV["GIT_CONFIG_GLOBAL"] = git_config_global_path
    ENV["GIT_TERMINAL_PROMPT"] = "false"
    configure_git_to_use_https_with_credentials(credentials, safe_directories, git_config_global_path)
    yield
  ensure
    ENV["GIT_CONFIG_GLOBAL"] = previous_config
    ENV["GIT_TERMINAL_PROMPT"] = previous_terminal_prompt
  end
rescue Errno::ENOSPC => e
  raise Dependabot::OutOfDisk, e.message
ensure
  FileUtils.rm_f(T.must(git_config_global_path))
end