Add support for docker-compose.yml files. Closes #390

docker/lib/dependabot/common/file_parser_helper.rb

@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+require "docker_registry2"
+
+require "dependabot/dependency"
+require "dependabot/errors"
+require "dependabot/docker/utils/credentials_finder"
+
+module Dependabot
+  module Docker
+    module FileParserHelper
+      private
+
+      def version_from(parsed_info)
+        return parsed_info.fetch("tag") if parsed_info.fetch("tag")
+
+        version_from_digest(
+          registry: parsed_info.fetch("registry"),
+          image: parsed_info.fetch("image"),
+          digest: parsed_info.fetch("digest")
+        )
+      end
+
+      def source_from(parsed_info)
+        source = {}
+
+        %w(registry tag digest).each do |part|
+          value = parsed_info.fetch(part)
+          source[part.to_sym] = value if value
+        end
+
+        source
+      end
+
+      def version_from_digest(registry:, image:, digest:)
+        return unless digest
+
+        repo = docker_repo_name(image, registry)
+        client = docker_registry_client(registry)
+        client.tags(repo, auto_paginate: true).fetch("tags").find do |tag|
+          digest == client.digest(repo, tag)
+        rescue DockerRegistry2::NotFound
+          # Shouldn't happen, but it does. Example of existing tag with
+          # no manifest is "library/python", "2-windowsservercore".
+          false
+        end
+      rescue DockerRegistry2::RegistryAuthenticationException,
+             RestClient::Forbidden
+        raise if standard_registry?(registry)
+
+        raise PrivateSourceAuthenticationFailure, registry
+      end
+
+      def docker_repo_name(image, registry)
+        return image unless standard_registry?(registry)
+        return image unless image.split("/").count < 2
+
+        "library/#{image}"
+      end
+
+      def docker_registry_client(registry)
+        if registry
+          credentials = registry_credentials(registry)
+
+          DockerRegistry2::Registry.new(
+            "https://#{registry}",
+            user: credentials&.fetch("username", nil),
+            password: credentials&.fetch("password", nil)
+          )
+        else
+          DockerRegistry2::Registry.new("https://registry.hub.docker.com")
+        end
+      end
+
+      def registry_credentials(registry_url)
+        credentials_finder.credentials_for_registry(registry_url)
+      end
+
+      def credentials_finder
+        @credentials_finder ||= Utils::CredentialsFinder.new(credentials)
+      end
+
+      def standard_registry?(registry)
+        return true if registry.nil?
+
+        registry == "registry.hub.docker.com"
+      end
+    end
+  end
+end

docker/lib/dependabot/common/file_updater_helper.rb

@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+require "dependabot/file_updaters"
+require "dependabot/file_updaters/base"
+require "dependabot/errors"
+
+module Dependabot
+  module Docker
+    module FileUpdaterHelper
+      private
+
+      def update_digest_and_tag(file)
+        old_declaration_regex = digest_and_tag_regex(old_digest(file))
+
+        file.content.gsub(old_declaration_regex) do |old_dec|
+          old_dec.
+            gsub("@#{old_digest(file)}", "@#{new_digest(file)}").
+            gsub(":#{dependency.previous_version}",
+                 ":#{dependency.version}")
+        end
+      end
+
+      def update_tag(file)
+        return unless old_tag(file)
+
+        old_declaration =
+          if private_registry_url(file) then "#{private_registry_url(file)}/"
+          else ""
+          end
+        old_declaration += "#{dependency.name}:#{old_tag(file)}"
+
+        old_declaration_regex = tag_regex(old_declaration)
+
+        file.content.gsub(old_declaration_regex) do |old_dec|
+          old_dec.gsub(":#{old_tag(file)}", ":#{new_tag(file)}")
+        end
+      end
+
+      def fetch_file_source(file, reqs)
+        reqs.
+          find { |req| req[:file] == file.name }.
+          fetch(:source)
+      end
+
+      def fetch_property_in_file_source(file, reqs, property)
+        fetch_file_source(file, reqs).fetch(property)
+      end
+
+      def specified_with_digest?(file)
+        fetch_file_source(file, dependency.requirements)[:digest]
+      end
+
+      def new_digest(file)
+        return unless specified_with_digest?(file)
+
+        fetch_property_in_file_source(file, dependency.requirements, :digest)
+      end
+
+      def old_digest(file)
+        return unless specified_with_digest?(file)
+
+        fetch_property_in_file_source(
+          file,
+          dependency.previous_requirements,
+          :digest
+        )
+      end
+
+      def digest(file, reqs)
+        return unless specified_with_digest?(file)
+
+        fetch_property_in_file_source(file, reqs, :digest)
+      end
+
+      def new_tag(file)
+        fetch_property_in_file_source(file, dependency.requirements, :tag)
+      end
+
+      def old_tag(file)
+        fetch_property_in_file_source(
+          file,
+          dependency.previous_requirements,
+          :tag
+        )
+      end
+
+      def private_registry_url(file)
+        fetch_file_source(file, dependency.requirements)[:registry]
+      end
+    end
+  end
+end

docker/lib/dependabot/docker.rb

@@ -10,6 +10,8 @@
 require "dependabot/docker/requirement"
 require "dependabot/docker/version"
 
+require_relative "docker_compose"
+
 require "dependabot/pull_request_creator/labeler"
 Dependabot::PullRequestCreator::Labeler.
   register_label_details("docker", name: "docker", colour: "21ceff")

docker/lib/dependabot/docker/file_parser.rb

@@ -1,18 +1,16 @@
 # frozen_string_literal: true
 
-require "docker_registry2"
-
-require "dependabot/dependency"
 require "dependabot/file_parsers"
 require "dependabot/file_parsers/base"
-require "dependabot/errors"
-require "dependabot/docker/utils/credentials_finder"
+require "dependabot/common/file_parser_helper"
 
 module Dependabot
   module Docker
     class FileParser < Dependabot::FileParsers::Base
       require "dependabot/file_parsers/base/dependency_set"
 
+      include Dependabot::Docker::FileParserHelper
+
       # Details of Docker regular expressions is at
       # https://github.com/docker/distribution/blob/master/reference/regexp.go
       DOMAIN_COMPONENT =
@@ -72,88 +70,6 @@ def dockerfiles
         dependency_files
       end
 
-      def version_from(parsed_from_line)
-        return parsed_from_line.fetch("tag") if parsed_from_line.fetch("tag")
-
-        version_from_digest(
-          registry: parsed_from_line.fetch("registry"),
-          image: parsed_from_line.fetch("image"),
-          digest: parsed_from_line.fetch("digest")
-        )
-      end
-
-      def source_from(parsed_from_line)
-        source = {}
-
-        if parsed_from_line.fetch("registry")
-          source[:registry] = parsed_from_line.fetch("registry")
-        end
-
-        if parsed_from_line.fetch("tag")
-          source[:tag] = parsed_from_line.fetch("tag")
-        end
-
-        if parsed_from_line.fetch("digest")
-          source[:digest] = parsed_from_line.fetch("digest")
-        end
-
-        source
-      end
-
-      def version_from_digest(registry:, image:, digest:)
-        return unless digest
-
-        repo = docker_repo_name(image, registry)
-        client = docker_registry_client(registry)
-        client.tags(repo, auto_paginate: true).fetch("tags").find do |tag|
-          digest == client.digest(repo, tag)
-        rescue DockerRegistry2::NotFound
-          # Shouldn't happen, but it does. Example of existing tag with
-          # no manifest is "library/python", "2-windowsservercore".
-          false
-        end
-      rescue DockerRegistry2::RegistryAuthenticationException,
-             RestClient::Forbidden
-        raise if standard_registry?(registry)
-
-        raise PrivateSourceAuthenticationFailure, registry
-      end
-
-      def docker_repo_name(image, registry)
-        return image unless standard_registry?(registry)
-        return image unless image.split("/").count < 2
-
-        "library/#{image}"
-      end
-
-      def docker_registry_client(registry)
-        if registry
-          credentials = registry_credentials(registry)
-
-          DockerRegistry2::Registry.new(
-            "https://#{registry}",
-            user: credentials&.fetch("username", nil),
-            password: credentials&.fetch("password", nil)
-          )
-        else
-          DockerRegistry2::Registry.new("https://registry.hub.docker.com")
-        end
-      end
-
-      def registry_credentials(registry_url)
-        credentials_finder.credentials_for_registry(registry_url)
-      end
-
-      def credentials_finder
-        @credentials_finder ||= Utils::CredentialsFinder.new(credentials)
-      end
-
-      def standard_registry?(registry)
-        return true if registry.nil?
-
-        registry == "registry.hub.docker.com"
-      end
-
       def check_required_files
         # Just check if there are any files at all.
         return if dependency_files.any?

docker/lib/dependabot/docker/file_updater.rb

@@ -3,10 +3,13 @@
 require "dependabot/file_updaters"
 require "dependabot/file_updaters/base"
 require "dependabot/errors"
+require "dependabot/common/file_updater_helper"
 
 module Dependabot
   module Docker
     class FileUpdater < Dependabot::FileUpdaters::Base
+      include Dependabot::Docker::FileUpdaterHelper
+
       FROM_REGEX = /FROM/i.freeze
 
       def self.updated_files_regex
@@ -59,74 +62,14 @@ def updated_dockerfile_content(file)
         updated_content
       end
 
-      def update_digest_and_tag(file)
-        old_declaration_regex = /^#{FROM_REGEX}\s+.*@#{old_digest(file)}/
-
-        file.content.gsub(old_declaration_regex) do |old_dec|
-          old_dec.
-            gsub("@#{old_digest(file)}", "@#{new_digest(file)}").
-            gsub(":#{dependency.previous_version}",
-                 ":#{dependency.version}")
-        end
+      def digest_and_tag_regex(digest)
+        /^#{FROM_REGEX}\s+.*@#{digest}/
       end
 
-      def update_tag(file)
-        return unless old_tag(file)
-
-        old_declaration =
-          if private_registry_url(file) then "#{private_registry_url(file)}/"
-          else ""
-          end
-        old_declaration += "#{dependency.name}:#{old_tag(file)}"
-        escaped_declaration = Regexp.escape(old_declaration)
-
-        old_declaration_regex =
-          %r{^#{FROM_REGEX}\s+(docker\.io/)?#{escaped_declaration}(?=\s|$)}
-
-        file.content.gsub(old_declaration_regex) do |old_dec|
-          old_dec.gsub(":#{old_tag(file)}", ":#{new_tag(file)}")
-        end
-      end
-
-      def specified_with_digest?(file)
-        dependency.
-          requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source)[:digest]
-      end
-
-      def new_digest(file)
-        return unless specified_with_digest?(file)
-
-        dependency.requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source).fetch(:digest)
-      end
-
-      def old_digest(file)
-        return unless specified_with_digest?(file)
-
-        dependency.previous_requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source).fetch(:digest)
-      end
-
-      def new_tag(file)
-        dependency.requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source)[:tag]
-      end
-
-      def old_tag(file)
-        dependency.previous_requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source)[:tag]
-      end
+      def tag_regex(declaration)
+        escaped_declaration = Regexp.escape(declaration)
 
-      def private_registry_url(file)
-        dependency.requirements.
-          find { |r| r[:file] == file.name }.
-          fetch(:source)[:registry]
+        %r{^#{FROM_REGEX}\s+(docker\.io/)?#{escaped_declaration}(?=\s|$)}
       end
     end
   end