Module: Dependabot::SharedHelpers

Defined in:
lib/dependabot/shared_helpers.rb

Defined Under Namespace

Classes: ChildProcessFailed, HelperSubprocessFailed

Constant Summary collapse

BUMP_TMP_FILE_PREFIX =
"dependabot_"
BUMP_TMP_DIR_PATH =
"tmp"
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_credentials(credentials) ⇒ Object

rubocop:disable Metrics/PerceivedComplexity



201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
# File 'lib/dependabot/shared_helpers.rb', line 201

def self.configure_git_credentials(credentials)
  # 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.
  credential_helper_path =
    File.join(__dir__, "../../bin/git-credential-store-immutable")
  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

  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"
  end

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

.configure_git_to_use_httpsObject



175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
# File 'lib/dependabot/shared_helpers.rb', line 175

def self.configure_git_to_use_https
  # 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://github.com/."\
    "insteadOf ssh://[email protected]/"
  )
  run_shell_command(
    "git config --global --add url.https://github.com/."\
    "insteadOf ssh://[email protected]:"
  )
  run_shell_command(
    "git config --global --add url.https://github.com/."\
    "insteadOf [email protected]:"
  )
  run_shell_command(
    "git config --global --add url.https://github.com/."\
    "insteadOf [email protected]/"
  )
  run_shell_command(
    "git config --global --add url.https://github.com/."\
    "insteadOf git://github.com/"
  )
end

.configure_git_to_use_https_with_credentials(credentials) ⇒ Object



167
168
169
170
171
172
173
# File 'lib/dependabot/shared_helpers.rb', line 167

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
  configure_git_to_use_https
  configure_git_credentials(credentials)
end

.escape_command(command) ⇒ Object

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



81
82
83
84
# File 'lib/dependabot/shared_helpers.rb', line 81

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

.excon_defaults(options = nil) ⇒ Object



146
147
148
149
150
151
152
153
154
155
156
157
# File 'lib/dependabot/shared_helpers.rb', line 146

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



139
140
141
142
143
144
# File 'lib/dependabot/shared_helpers.rb', line 139

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

.excon_middlewareObject



133
134
135
136
137
# File 'lib/dependabot/shared_helpers.rb', line 133

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

.in_a_temporary_directory(directory = "/") ⇒ Object



55
56
57
58
59
60
61
62
# File 'lib/dependabot/shared_helpers.rb', line 55

def self.in_a_temporary_directory(directory = "/")
  Dir.mkdir(BUMP_TMP_DIR_PATH) unless Dir.exist?(BUMP_TMP_DIR_PATH)
  Dir.mktmpdir(BUMP_TMP_FILE_PREFIX, 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



39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
# File 'lib/dependabot/shared_helpers.rb', line 39

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

rubocop:enable Metrics/PerceivedComplexity



247
248
249
250
251
252
# File 'lib/dependabot/shared_helpers.rb', line 247

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



265
266
267
268
269
270
271
272
273
# File 'lib/dependabot/shared_helpers.rb', line 265

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



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
129
130
131
# File 'lib/dependabot/shared_helpers.rb', line 86

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)
  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



275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
# File 'lib/dependabot/shared_helpers.rb', line 275

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



254
255
256
257
258
259
260
261
262
263
# File 'lib/dependabot/shared_helpers.rb', line 254

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



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

def self.with_git_configured(credentials:)
  backup_git_config_path = stash_global_git_config
  configure_git_to_use_https_with_credentials(credentials)
  yield
ensure
  reset_global_git_config(backup_git_config_path)
end