docker support for Containerfile name

docker/lib/dependabot/docker/file_fetcher.rb

@@ -8,7 +8,7 @@ module Dependabot
   module Docker
     class FileFetcher < Dependabot::FileFetchers::Base
       YAML_REGEXP = /^[^\.]+\.ya?ml$/i
-      DOCKER_REGEXP = /dockerfile/i
+      DOCKER_REGEXP = /(docker|container)file/i
       HELM_REGEXP = /values[\-a-zA-Z_0-9]*\.yaml/i
 
       def self.required_files_in?(filenames)
@@ -17,7 +17,7 @@ def self.required_files_in?(filenames)
       end
 
       def self.required_files_message
-        "Repo must contain a Dockerfile or Kubernetes YAML files."
+        "Repo must contain a Dockerfile, Containerfile, or Kubernetes YAML files."
       end
 
       private
@@ -41,7 +41,7 @@ def fetch_files
         elsif incorrectly_encoded_dockerfiles.none? && incorrectly_encoded_yamlfiles.none?
           raise(
             Dependabot::DependabotError,
-            "Found neither Kubernetes YAML nor Dockerfiles in #{directory}"
+            "Found neither Kubernetes YAML nor Dockerfiles nor Containerfiles in #{directory}"
           )
         elsif incorrectly_encoded_dockerfiles.none?
           raise(

docker/lib/dependabot/docker/file_updater.rb

@@ -11,7 +11,7 @@ class FileUpdater < Dependabot::FileUpdaters::Base
 
       def self.updated_files_regex
         [
-          /dockerfile/i,
+          /(docker|container)file/i,
           /^[^\.]+\.ya?ml/i
         ]
       end
@@ -51,7 +51,7 @@ def check_required_files
         # Just check if there are any files at all.
         return if dependency_files.any?
 
-        raise "No Dockerfile!"
+        raise "No Dockerfile or Containerfile!"
       end
 
       def updated_dockerfile_content(file)

docker/spec/dependabot/docker/file_fetcher_spec.rb

@@ -72,6 +72,34 @@
     end
   end
 
+  context "with a Containerfile" do
+    before do
+      stub_request(:get, url + "?ref=sha").
+        with(headers: { "Authorization" => "token token" }).
+        to_return(
+          status: 200,
+          body: fixture("github", "contents_docker_repo.json"),
+          headers: { "content-type" => "application/json" }
+        )
+
+      stub_request(:get, File.join(url, "Dockerfile?ref=sha")).
+        with(headers: { "Authorization" => "token token" }).
+        to_return(
+          status: 200,
+          body: dockerfile_fixture,
+          headers: { "content-type" => "application/json" }
+        )
+    end
+
+    let(:dockerfile_fixture) { fixture("github", "contents_containerfile.json") }
+
+    it "fetches the Containerfile" do
+      expect(file_fetcher_instance.files.count).to eq(1)
+      expect(file_fetcher_instance.files.map(&:name)).
+        to match_array(%w(Containerfile))
+    end
+  end
+
   context "with multiple Dockerfiles" do
     before do
       stub_request(:get, url + "?ref=sha").

docker/spec/fixtures/github/contents_containerfile.json

@@ -0,0 +1,19 @@
+{
+  "name": "Containerfile",
+  "path": "Containerfile",
+  "sha": "311f9743315183cc6751313cb251cfeb3de45c1a",
+  "size": 4927,
+  "url": "https://api.github.com/repos/dependabot/dependabot-core/contents/Containerfile?ref=master",
+  "html_url": "https://github.com/dependabot/dependabot-core/blob/main/Containerfile",
+  "git_url": "https://api.github.com/repos/dependabot/dependabot-core/git/blobs/311f9743315183cc6751313cb251cfeb3de45c1a",
+  "download_url": "https://raw.githubusercontent.com/dependabot/dependabot-core/master/Containerfile",
+  "type": "file",
+  "content": 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+  "encoding": "base64",
+  "_links": {
+    "self": "https://api.github.com/repos/dependabot/dependabot-core/contents/Containerfile?ref=master",
+    "git": "https://api.github.com/repos/dependabot/dependabot-core/git/blobs/311f9743315183cc6751313cb251cfeb3de45c1a",
+    "html": "https://github.com/dependabot/dependabot-core/blob/main/Containerfile"
+  }
+}
+

docker/spec/fixtures/github/contents_docker_repo.json

@@ -111,6 +111,22 @@
       "html": "https://github.com/dependabot/dependabot-core/blob/main/Dockerfile"
     }
   },
+  {
+    "name": "Containerfile",
+    "path": "Containerfile",
+    "sha": "311f9743315183cc6751313cb251cfeb3de45c1a",
+    "size": 4927,
+    "url": "https://api.github.com/repos/dependabot/dependabot-core/contents/Containerfile?ref=master",
+    "html_url": "https://github.com/dependabot/dependabot-core/blob/main/Containerfile",
+    "git_url": "https://api.github.com/repos/dependabot/dependabot-core/git/blobs/311f9743315183cc6751313cb251cfeb3de45c1a",
+    "download_url": "https://raw.githubusercontent.com/dependabot/dependabot-core/master/Containerfile",
+    "type": "file",
+    "_links": {
+      "self": "https://api.github.com/repos/dependabot/dependabot-core/contents/Containerfile?ref=master",
+      "git": "https://api.github.com/repos/dependabot/dependabot-core/git/blobs/311f9743315183cc6751313cb251cfeb3de45c1a",
+      "html": "https://github.com/dependabot/dependabot-core/blob/main/Containerfile"
+    }
+  },
   {
     "name": "Gemfile",
     "path": "Gemfile",