1 files changed, 122 insertions, 0 deletions
diff --git a/infra/utils.py b/infra/utils.py
new file mode 100644
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--- /dev/null
+++ b/infra/utils.py
@@ -0,0 +1,122 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Utilities for OSS-Fuzz infrastructure."""
+
+import os
+import re
+import stat
+import subprocess
+
+import helper
+
+ALLOWED_FUZZ_TARGET_EXTENSIONS = ['', '.exe']
+FUZZ_TARGET_SEARCH_STRING = 'LLVMFuzzerTestOneInput'
+VALID_TARGET_NAME = re.compile(r'^[a-zA-Z0-9_-]+$')
+
+
+def chdir_to_root():
+  """Changes cwd to OSS-Fuzz root directory."""
+  # Change to oss-fuzz main directory so helper.py runs correctly.
+  if os.getcwd() != helper.OSSFUZZ_DIR:
+    os.chdir(helper.OSSFUZZ_DIR)
+
+
+def execute(command, location=None, check_result=False):
+  """ Runs a shell command in the specified directory location.
+
+  Args:
+    command: The command as a list to be run.
+    location: The directory the command is run in.
+    check_result: Should an exception be thrown on failed command.
+
+  Returns:
+    The stdout of the command, the error code.
+
+  Raises:
+    RuntimeError: running a command resulted in an error.
+  """
+
+  if not location:
+    location = os.getcwd()
+  process = subprocess.Popen(command, stdout=subprocess.PIPE, cwd=location)
+  out, err = process.communicate()
+  if check_result and (process.returncode or err):
+    raise RuntimeError('Error: %s\n Command: %s\n Return code: %s\n Out: %s' %
+                       (err, command, process.returncode, out))
+  if out is not None:
+    out = out.decode('ascii').rstrip()
+  return out, process.returncode
+
+
+def get_fuzz_targets(path):
+  """Get list of fuzz targets in a directory.
+
+  Args:
+    path: A path to search for fuzz targets in.
+
+  Returns:
+    A list of paths to fuzzers or an empty list if None.
+  """
+  if not os.path.exists(path):
+    return []
+  fuzz_target_paths = []
+  for root, _, _ in os.walk(path):
+    for filename in os.listdir(path):
+      file_path = os.path.join(root, filename)
+      if is_fuzz_target_local(file_path):
+        fuzz_target_paths.append(file_path)
+
+  return fuzz_target_paths
+
+
+def get_container_name():
+  """Gets the name of the current docker container you are in.
+  /proc/self/cgroup can be used to check control groups e.g. Docker.
+  See: https://docs.docker.com/config/containers/runmetrics/ for more info.
+
+  Returns:
+    Container name or None if not in a container.
+  """
+  with open('/proc/self/cgroup') as file_handle:
+    if 'docker' not in file_handle.read():
+      return None
+  with open('/etc/hostname') as file_handle:
+    return file_handle.read().strip()
+
+
+def is_fuzz_target_local(file_path):
+  """Returns whether |file_path| is a fuzz target binary (local path).
+  Copied from clusterfuzz src/python/bot/fuzzers/utils.py
+  with slight modifications.
+  """
+  filename, file_extension = os.path.splitext(os.path.basename(file_path))
+  if not VALID_TARGET_NAME.match(filename):
+    # Check fuzz target has a valid name (without any special chars).
+    return False
+
+  if file_extension not in ALLOWED_FUZZ_TARGET_EXTENSIONS:
+    # Ignore files with disallowed extensions (to prevent opening e.g. .zips).
+    return False
+
+  if not os.path.exists(file_path) or not os.access(file_path, os.X_OK):
+    return False
+
+  if filename.endswith('_fuzzer'):
+    return True
+
+  if os.path.exists(file_path) and not stat.S_ISREG(os.stat(file_path).st_mode):
+    return False
+
+  with open(file_path, 'rb') as file_handle:
+    return file_handle.read().find(FUZZ_TARGET_SEARCH_STRING.encode()) != -1