fix(buildcomponent): fix dockerfile cases

some errors were introduced with file paths of the form "/some_path/some_other_path" as "some_other_path" would be the dockerfile name

buildman/component/buildcomponent.py

@@ -124,15 +124,7 @@ class BuildComponent(BaseComponent):
     #   username: The username for pulling the base image (if any).
     #   password: The password for pulling the base image (if any).
 
-    subdir, dockerfile_name = os.path.split(build_config.get('build_subdir', '/Dockerfile'))
-
-    # HACK HACK HACK HACK HACK HACK HACK
-    # TODO: FIX THIS in the database and then turn the split back on.
-    if dockerfile_name.find('Dockerfile') < 0:
-      # This is a *HACK* for the broken path handling. To be fixed ASAP.
-      subdir = build_config.get('build_subdir') or '/'
-      dockerfile_name = 'Dockerfile'
-    # /HACK HACK HACK HACK HACK HACK HACK
+    subdir, dockerfile_name = self.name_and_path(build_config.get('build_subdir'))
 
     build_arguments = {
       'build_package': build_job.get_build_package_url(self.user_files),
@@ -188,6 +180,14 @@ class BuildComponent(BaseComponent):
     old_commit_sha = build_config['trigger_metadata'].get('commit_sha', '')
     return commit_sha or old_commit_sha
 
+  @staticmethod
+  def name_and_path(subdir):
+    """ Returns the dockerfile path and name """
+    if subdir.endswith("/"):
+      subdir += "Dockerfile"
+    elif not subdir.endswith("Dockerfile"):
+      subdir += "/Dockerfile"
+    return os.path.split(subdir)
 
   @staticmethod
   def _total_completion(statuses, total_images):

buildman/component/test/test_buildcomponent.py

@@ -0,0 +1,23 @@
+import pytest
+
+from buildman.component.buildcomponent import BuildComponent
+
+
+@pytest.mark.parametrize('input,expected_path,expected_file', [
+  ("", "/", "Dockerfile"),
+  ("/", "/", "Dockerfile"),
+  ("/Dockerfile", "/", "Dockerfile"),
+  ("/server.Dockerfile", "/", "server.Dockerfile"),
+  ("/somepath", "/somepath", "Dockerfile"),
+  ("/somepath/", "/somepath", "Dockerfile"),
+  ("/somepath/Dockerfile", "/somepath", "Dockerfile"),
+  ("/somepath/server.Dockerfile", "/somepath", "server.Dockerfile"),
+  ("/somepath/some_other_path", "/somepath/some_other_path", "Dockerfile"),
+  ("/somepath/some_other_path/", "/somepath/some_other_path", "Dockerfile"),
+  ("/somepath/some_other_path/Dockerfile", "/somepath/some_other_path", "Dockerfile"),
+  ("/somepath/some_other_path/server.Dockerfile", "/somepath/some_other_path", "server.Dockerfile"),
+])
+def test_path_is_dockerfile(input, expected_path, expected_file):
+  actual_path, actual_file = BuildComponent.name_and_path(input)
+  assert actual_path == expected_path
+  assert actual_file == expected_file