Module: Dependabot::SharedHelpers

Defined in:
lib/dependabot/shared_helpers.rb

Defined Under Namespace

Classes: HelperSubprocessFailed

Constant Summary collapse

GIT_CONFIG_GLOBAL_PATH =
File.expand_path("~/.gitconfig")
USER_AGENT =
"dependabot-core/#{Dependabot::VERSION} "\
"#{Excon::USER_AGENT} ruby/#{RUBY_VERSION} "\
"(#{RUBY_PLATFORM}) "\
"(+https://github.com/dependabot/dependabot-core)"
SIGKILL =
9

Class Method Summary collapse

Class Method Details

.configure_git_to_use_https(host) ⇒ Object

rubocop:enable Metrics/AbcSize rubocop:enable Metrics/PerceivedComplexity



226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
# File 'lib/dependabot/shared_helpers.rb', line 226

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) ⇒ Object

rubocop:disable Metrics/AbcSize rubocop:disable Metrics/PerceivedComplexity



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
214
215
216
217
218
219
220
221
222
# File 'lib/dependabot/shared_helpers.rb', line 173

def self.configure_git_to_use_https_with_credentials(credentials)
  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
  )

  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["username"] && cred["password"]

    authenticated_url =
      "https://#{cred.fetch('username')}:#{cred.fetch('password')}"\
      "@#{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_pathObject



167
168
169
# File 'lib/dependabot/shared_helpers.rb', line 167

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

.escape_command(command) ⇒ Object

Escapes all special characters, e.g. = & | <>



67
68
69
70
# File 'lib/dependabot/shared_helpers.rb', line 67

def self.escape_command(command)
  command_parts = command.split.map(&:strip).reject(&:empty?)
  Shellwords.join(command_parts)
end

.excon_defaults(options = nil) ⇒ Object



144
145
146
147
148
149
150
151
152
153
154
155
# File 'lib/dependabot/shared_helpers.rb', line 144

def self.excon_defaults(options = nil)
  options ||= {}
  headers = options.delete(:headers)
  {
    connect_timeout: 5,
    write_timeout: 5,
    read_timeout: 20,
    omit_default_port: true,
    middlewares: excon_middleware,
    headers: excon_headers(headers)
  }.merge(options)
end

.excon_headers(headers = nil) ⇒ Object



137
138
139
140
141
142
# File 'lib/dependabot/shared_helpers.rb', line 137

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

.excon_middlewareObject

rubocop:enable Metrics/MethodLength



131
132
133
134
135
# File 'lib/dependabot/shared_helpers.rb', line 131

def self.excon_middleware
  Excon.defaults[:middlewares] +
    [Excon::Middleware::Decompress] +
    [Excon::Middleware::RedirectFollower]
end

.in_a_temporary_directory(directory = "/") ⇒ Object



41
42
43
44
45
46
47
48
# File 'lib/dependabot/shared_helpers.rb', line 41

def self.in_a_temporary_directory(directory = "/")
  Dir.mkdir(Utils::BUMP_TMP_DIR_PATH) unless Dir.exist?(Utils::BUMP_TMP_DIR_PATH)
  Dir.mktmpdir(Utils::BUMP_TMP_FILE_PREFIX, Utils::BUMP_TMP_DIR_PATH) do |dir|
    path = Pathname.new(File.join(dir, directory)).expand_path
    FileUtils.mkpath(path)
    Dir.chdir(path) { yield(path) }
  end
end

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



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
# File 'lib/dependabot/shared_helpers.rb', line 25

def self.in_a_temporary_repo_directory(directory = "/",
                                       repo_contents_path = nil,
                                       &block)
  if repo_contents_path
    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) unless Dir.exist?(path)
    Dir.chdir(path) { yield(path) }
  else
    in_a_temporary_directory(directory, &block)
  end
end

.reset_git_repo(path) ⇒ Object



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

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

.reset_global_git_config(backup_path) ⇒ Object



269
270
271
272
273
274
275
276
277
# File 'lib/dependabot/shared_helpers.rb', line 269

def self.reset_global_git_config(backup_path)
  if backup_path.nil?
    FileUtils.rm(GIT_CONFIG_GLOBAL_PATH)
    return
  end
  return unless File.exist?(backup_path)

  FileUtils.mv(backup_path, GIT_CONFIG_GLOBAL_PATH)
end

.run_helper_subprocess(command:, function:, args:, env: nil, stderr_to_stdout: false, allow_unsafe_shell_command: false) ⇒ Object

rubocop:disable Metrics/MethodLength



73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
# File 'lib/dependabot/shared_helpers.rb', line 73

def self.run_helper_subprocess(command:, function:, args:, env: nil,
                               stderr_to_stdout: false,
                               allow_unsafe_shell_command: false)
  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
    byebug # rubocop:disable Lint/Debugger
  end

  env_cmd = [env, cmd].compact
  stdout, stderr, process = Open3.capture3(*env_cmd, stdin_data: stdin_data)
  time_taken = Time.now - start

  if ENV["DEBUG_HELPERS"] == "true"
    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 ? stderr[0..50_000] : "", # Truncate to ~100kb
    process_exit_value: process.to_s,
    process_termsig: process.termsig
  }

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

  raise HelperSubprocessFailed.new(
    message: response["error"],
    error_class: response["error_class"],
    error_context: error_context,
    trace: response["trace"]
  )
rescue JSON::ParserError
  raise HelperSubprocessFailed.new(
    message: stdout || "No output from command",
    error_class: "JSON::ParserError",
    error_context: error_context
  )
end

.run_shell_command(command, allow_unsafe_shell_command: false) ⇒ Object



279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
# File 'lib/dependabot/shared_helpers.rb', line 279

def self.run_shell_command(command, allow_unsafe_shell_command: false)
  start = Time.now
  cmd = allow_unsafe_shell_command ? command : escape_command(command)
  stdout, process = Open3.capture2e(cmd)
  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,
    time_taken: time_taken,
    process_exit_value: process.to_s
  }

  raise SharedHelpers::HelperSubprocessFailed.new(
    message: stdout,
    error_context: error_context
  )
end

.stash_global_git_configObject



258
259
260
261
262
263
264
265
266
267
# File 'lib/dependabot/shared_helpers.rb', line 258

def self.stash_global_git_config
  return unless File.exist?(GIT_CONFIG_GLOBAL_PATH)

  contents = File.read(GIT_CONFIG_GLOBAL_PATH)
  digest = Digest::SHA2.hexdigest(contents)[0...10]
  backup_path = GIT_CONFIG_GLOBAL_PATH + ".backup-#{digest}"

  FileUtils.mv(GIT_CONFIG_GLOBAL_PATH, backup_path)
  backup_path
end

.with_git_configured(credentials:) ⇒ Object



157
158
159
160
161
162
163
164
165
# File 'lib/dependabot/shared_helpers.rb', line 157

def self.with_git_configured(credentials:)
  backup_git_config_path = stash_global_git_config
  configure_git_to_use_https_with_credentials(credentials)
  yield
rescue Errno::ENOSPC => e
  raise Dependabot::OutOfDisk, e.message
ensure
  reset_global_git_config(backup_git_config_path)
end