[infra] Introduce "language" attribute in the project.yaml (#3297).

docs/getting-started/new-project-guide/go_lang.md

@@ -30,12 +30,19 @@ libFuzzer command line interface as non-Go fuzz targets.
 ## Project files
 
 The structure of the project directory in OSS-Fuzz repository doesn't differ for
-projects written in Go. The project files have the following Go specific aspects.
+projects written in Go. The project files have the following Go specific
+aspects.
 
 ### project.yaml
 
-For projects written in Go, we use only `libfuzzer` fuzzing engine and `address`
-sanitizer.
+The `language` attribute must be specified.
+
+```yaml
+language: go
+```
+
+The only supported fuzzing engine and sanitizer are `libfuzzer` and `address`,
+respectively.
 [Example](https://github.com/google/oss-fuzz/blob/356f2b947670b7eb33a1f535c71bc5c87a60b0d1/projects/syzkaller/project.yaml#L7):
 
 ```yaml

infra/gcb/build_and_run_coverage.py

@@ -34,8 +34,8 @@
 # Link where to upload code coverage report files to.
 UPLOAD_URL_FORMAT = 'gs://' + COVERAGE_BUCKET_NAME + '/{project}/{type}/{date}'
 
-# TODO(#2817): Support code coverage for Go projects.
-GO_FUZZ_BUILD = 'go-fuzz-build -libfuzzer'
+# Languages from project.yaml that have code coverage support.
+LANGUAGES_WITH_COVERAGE_SUPPORT = ['c', 'cpp']
 
 
 def skip_build(message):
@@ -61,9 +61,9 @@ def get_build_steps(project_dir):
   build_script_path = os.path.join(project_dir, 'build.sh')
   if os.path.exists(build_script_path):
     with open(build_script_path) as fh:
-      if GO_FUZZ_BUILD in fh.read():
-        skip_build('Project "%s" uses go-fuzz, coverage is not supported yet.' %
-                   project_name)
+      if project_yaml['language'] is not in LANGUAGES_WITH_COVERAGE_SUPPORT:
+        skip_build('Project "{project_name}" is written in "{language}", coverage is not supported yet.'.format(
+                   project_name=project_name, language=project_yaml['language']))
 
   dockerfile_path = os.path.join(project_dir, 'Dockerfile')
   name = project_yaml['name']

infra/gcb/build_project.py

@@ -58,6 +58,7 @@ def load_project_yaml(project_dir):
     project_yaml.setdefault('run_tests', True)
     project_yaml.setdefault('coverage_extra_args', '')
     project_yaml.setdefault('labels', {})
+    project_yaml.setdefault('language', 'cpp')
     return project_yaml
 
 

infra/presubmit.py

@@ -74,7 +74,7 @@ class ProjectYamlChecker:
   SECTIONS_AND_CONSTANTS = {
       'sanitizers': {'address', 'none', 'memory', 'undefined', 'dataflow'},
       'architectures': {'i386', 'x86_64'},
-      'fuzzing_engines': {'afl', 'libfuzzer', 'honggfuzz', 'dataflow'}
+      'fuzzing_engines': {'afl', 'libfuzzer', 'honggfuzz', 'dataflow'},
   }
 
   # Note: this list must be updated when we allow new sections.
@@ -89,8 +89,11 @@ class ProjectYamlChecker:
       'sanitizers',
       'vendor_ccs',
       'view_restrictions',
+      'language',
   ]
 
+  LANGUAGES_SUPPORTED = ['c', 'cpp', 'go', 'rust', 'python']
+
   # Note that some projects like boost only have auto-ccs. However, forgetting
   # primary contact is probably a mistake.
   REQUIRED_SECTIONS = ['primary_contact']
@@ -108,8 +111,11 @@ def do_checks(self):
       return True
 
     checks = [
-        self.check_project_yaml_constants, self.check_required_sections,
-        self.check_valid_section_names, self.check_valid_emails
+        self.check_project_yaml_constants,
+        self.check_required_sections,
+        self.check_valid_section_names,
+        self.check_valid_emails,
+        self.check_valid_language,
     ]
     for check_function in checks:
       check_function()
@@ -179,6 +185,16 @@ def check_valid_emails(self):
       if '@' not in email_address or '.' not in email_address:
         self.error(email_address + ' is an invalid email address.')
 
+  def check_valid_language(self):
+    """Check that the language specified is valid."""
+    language = self.data.get('language')
+    if not language:
+      return
+
+    if language not in self.LANGUAGES_SUPPORTED:
+      self.error('{language} is not supported ({supported}).'.format(
+          language=language, supported=self.LANGUAGES_SUPPORTED))
+
 
 def _check_one_project_yaml(project_yaml_filename):
   """Do checks on the project.yaml file."""

projects/mtail/project.yaml

@@ -4,3 +4,4 @@ fuzzing_engines:
   - libfuzzer
 sanitizers:
   - address
+language: go