[infra] v0 gcb building script (#446)

Doesn't perform the upload, but is supposed to build all sanitizer configuration.
I was primarily testing it on json.

infra/gcb/.gitignore

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+default/

infra/gcb/build.py

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+#!/usr/bin/python2
+
+"""Starts project build on Google Cloud Builder.
+
+Usage: build.py <project_dir>
+"""
+
+import datetime
+import os
+import pprint
+import sys
+import yaml
+
+from oauth2client.client import GoogleCredentials
+from googleapiclient.discovery import build
+
+
+CONFIGURATIONS = {
+  'sanitizer-address' : [ 'SANITIZER=address' ],
+  'sanitizer-memory' : [ 'SANITIZER=memory' ],
+  'sanitizer-undefined' : [ 'SANITIZER=undefined' ],
+  }
+
+
+def usage():
+  sys.stderr.write(
+    "Usage: " + sys.argv[0] + " <project_dir>\n")
+  exit(1)
+
+
+def load_project_yaml(project_dir):
+  project_name = os.path.basename(project_dir)
+  project_yaml_path = os.path.join(project_dir, 'project.yaml')
+  with open(project_yaml_path) as f:
+    project_yaml = yaml.safe_load(f)
+    project_yaml.setdefault('name', project_name)
+    project_yaml.setdefault('image', 
+        'gcr.io/clusterfuzz-external/oss-fuzz/' + project_name)
+    return project_yaml
+
+
+def get_build_steps(project_yaml):
+  name = project_yaml['name']
+  image = project_yaml['image']
+  print "Building " + image
+
+  ts = datetime.datetime.now().strftime('%Y%m%d%H%M')
+
+  build_steps = [
+          {
+              'name': 'gcr.io/cloud-builders/docker',
+              'args': [
+                  'build',
+                  '-t',
+                  image,
+                  '.',
+                  ],
+              'dir': 'projects/' + name,
+          },
+          {
+              'name': image,
+              'args': [ 'srcmap' ],
+              'env': [ 'OSSFUZZ_REVISION=$REVISION_ID' ],
+          },
+    ]
+
+  for sanitizer in project_yaml["sanitizers"]:
+    env = CONFIGURATIONS["sanitizer-" + sanitizer]
+    out = '/workspace/out/' + sanitizer
+    zip_file = name + "-" + sanitizer + "-" + ts + ".zip"
+
+    build_steps.extend([
+        {'name': image,
+          'env' : env,
+          'args': [
+            'bash',
+            '-c',
+            'cd /src/{1} && compile && mkdir -p {0} && cp -Rv /out/* {0}/'.format(out, name),
+            ],
+          },
+        {'name': image,
+          'args': [
+            'bash',
+            '-c',
+            'cd {0} && zip -r {1} *'.format(out, zip_file)
+          ],
+        }])
+
+  return build_steps
+
+
+def main():
+  if len(sys.argv) != 2:
+    usage()
+
+  project_dir = sys.argv[1]
+  project_yaml = load_project_yaml(project_dir)
+
+  options = {}
+  if "GCB_OPTIONS" in os.environ:
+    options = yaml.safe_load(os.environ["GCB_OPTIONS"])
+    print "Using options", options
+
+
+  build_body = {
+      'source': {
+          'repoSource': {
+              'branchName': 'master',
+              'projectId': 'clusterfuzz-external',
+              'repoName': 'oss-fuzz',
+          },
+      },
+      'steps': get_build_steps(project_yaml),
+      'timeout': str(4 * 3600) + 's',
+      'options': options,
+      'images': [ project_yaml['image'] ],
+  }
+
+  credentials = GoogleCredentials.get_application_default()
+  cloudbuild = build('cloudbuild', 'v1', credentials=credentials)
+  pp = pprint.PrettyPrinter(indent=4)
+  pp.pprint(build_body)
+  pp.pprint(cloudbuild.projects().builds().create(projectId='clusterfuzz-external', body=build_body).execute())
+
+
+if __name__ == "__main__":
+  main()

infra/gcb/requirements.txt

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+google-api-python-client
+PyYAML
+