CrOS: Update public waterfall to auto-configure.

scripts/tools/cros/cros_builder_convert.py

Index: scripts/tools/cros/cros_builder_convert.py
diff --git a/scripts/tools/cros/cros_builder_convert.py b/scripts/tools/cros/cros_builder_convert.py
new file mode 100755
index 0000000000000000000000000000000000000000..04125cfd8002aaefc7f21bd7669a0a93cb69ecad
--- /dev/null
+++ b/scripts/tools/cros/cros_builder_convert.py
@@ -0,0 +1,258 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Updates BuildBot builder directories to the new 'cbuildbot'-driven naming
+scheme.
+
+Classic BuildBot CrOS waterfalls define build directories by composing the
+directory name from component parts resembling the target and a final branch
+name. Oftentimes, these component parts (and, therefore, the composition) don't
+actually match the name of the underlying 'cbuildbot' target.
+
+This presents problems because the build target are fundamentally driven by
+their underlying 'cbuildbot' target, but the composition scheme is extremely
+arbitrary.
+
+Consequently, BuildBot masters are being migrated to a new, deterministic,
+'cbuildbot'-driven naming scheme. A builder building 'cbuildbot' target
+<target> and checking Chromite/'cbuildbot' from branch <branch> will use the
+builder name: <target>-<branch>. This is universally sustainable across all
+waterfalls and ensures that 'cbuildbot' builds are tracked and numbered based
+on their underlying 'cbuildbot' target.
+
+This script is intended to be run on a stopped BuildBot master during build
+directory migration. It will iterate through each build directory in the current
+master naming scheme and rename the classic directories into their new
+'cbuildbot'-driven namespace.
+"""
+
+import argparse
+import collections
+import logging
+import os
+import re
+import shutil
+import sys
+
+from common import cros_chromite
+
+
+class UpdateInfo(collections.namedtuple(
+    'UpdateInfo',
+    ('src', 'cbb_name', 'branch'))):
+  """Information about a single directory update action."""
+
+  _STATIC_PERMUTATIONS = {
+      'Canary master': 'master-canary',
+  }
+
+  _TRANSFORMATIONS = (
+      (r'-canary-', r'-release-'),
+      (r'(x86|amd64)$', r'\1-generic'),
+      (r'^chromium-tot-chromeos-(.+)-asan', r'\1-tot-asan-informational'),
+      (r'^chromium-tot-chromeos-(.+)', r'\1-tot-chrome-pfq-informational'),
+      (r'^chromium-(.+)-telemetry$', r'\1-telemetry'),
+      (r'(.+)-bin$', r'\1'),
+  )
+
+  @property
+  def dst(self):
+    """Constructs the <cbuildbot>-<branch> form."""
+    return '%s-%s' % (self.cbb_name, self.branch)
+
+  @classmethod
+  def permutations(cls, name):
+    """Attempts to permute a legacy BuildBot name into a Chromite target.
+
+    Args:
+      name (str): The source name to process and map.
+    Yields (str): Various permutations of 'name'.
+    """
+    # No cbuildbot targets use upper-case letters.
+    name = name.lower()
+
+    # If 'name' is already a 'cbuildbot' target, return it unmodified.
+    yield name
+
+    # Apply static permutations.
+    p = cls._STATIC_PERMUTATIONS.get(name)
+    if p:
+      yield p
+
+    # Replace 'canary' with 'release'.
+    for find, replace in cls._TRANSFORMATIONS:
+      name = re.sub(find, replace, name)
+      print find, replace, name
+    yield name
+
+    # Is 'name' valid if it was a release group?
+    if not name.endswith('-group'):
+      # We never build 'full' group variants.
+      name_group = ('%s-group' % (name,)).replace('-full-', '-release-')
+      yield name_group
+
+  @classmethod
+  def process(cls, config, name, default_branch):
+    """Construct an UpdateInfo to map a source name.
+
+    This function works by attempting to transform a source name into a known
+    'cbuildbot' target name. If successful, it will use that successful
+    transformation as validation of the correctness and return an UpdateInfo
+    describing the transformation.
+
+    Args:
+      config (cros_chromite.ChromiteConfig) The Chromite config instance.
+      name (str): The source name to process and map.
+      default_branch (str): The default branch to apply if the field is empty.
+    Returns (UpdateInfo/None): The constructed UpdateInfo, or None if there was
+        no identified mapping.
+    """
+    def sliding_split_gen():
+      parts = name.split('-')
+      for i in xrange(len(parts), 0, -1):
+        yield '-'.join(parts[:i]), '-'.join(parts[i:])
+
+    logging.debug("Processing candidate name: %s", name)
+    candidates = set()
+    branch = None
+    for orig_name, branch in sliding_split_gen():
+      logging.debug("Trying construction: Name(%s), Branch(%s)",
+          orig_name, branch)
+
+      # See if we can properly permute the original name.
+      for permuted_name in cls.permutations(orig_name):
+        if permuted_name in config:
+          candidates.add(permuted_name)
+      if not candidates:
+        logging.debug("No 'cbuildbot' config for attempts [%s] branch [%s].",
+                      orig_name, branch)
+        continue
+
+      # We've found a permutation that matches a 'cbuildbot' target.
+      break
+    else:
+      logging.info("No 'cbuildbot' permutations for [%s].", name)
+      return None
+
+    if not branch:
+      # We need to do an update to add the branch. Default to 'master'.
+      branch = default_branch
+
+    candidates = sorted(candidates)
+    for candidate in candidates:
+      logging.debug("Identified 'cbuildbot' name [%s] => [%s] branch [%s].",
+                    name, candidate, branch)
+    return [cls(name, p, branch) for p in candidates]
+
+
+def main(args):
+  """Main execution function.
+
+  Args:
+    args (list): Command-line argument array.
+  """
+  parser = argparse.ArgumentParser()
+  parser.add_argument('path', nargs='+', metavar='PATH',
+      help='The path to the master directory to process.')
+  parser.add_argument('-v', '--verbose', action='count', default=0,
+      help='Increase verbosity. Can be specified multiple times.')
+  parser.add_argument('-d', '--dry-run', action='store_true',
+      help="Print what actions will be taken, but don't modify anything.")
+  parser.add_argument('-B', '--branch', default='master',
+      help="The branch to use, if one is not present (default is %(default)s)")
+  parser.add_argument('-n', '--names', action='store_true',
+      help="If specified, then regard 'path' as directory names to test.")
+  args = parser.parse_args()
+
+  # Select verbosity.
+  if args.verbose == 0:
+    loglevel = logging.WARNING
+  elif args.verbose == 1:
+    loglevel = logging.INFO
+  else:
+    loglevel = logging.DEBUG
+  logging.getLogger().setLevel(loglevel)
+
+  # Load our Chromite config. We're going to load ToT.
+  cbuildbot_config = cros_chromite.Get()
+
+  # If we're just testing against names, do that.
+  if args.names:
+    errors = 0
+    for n in args.path:
+      update_info = UpdateInfo.process(cbuildbot_config, n, args.branch)
+      if update_info:
+        logging.warning("[%s] => [%s]", update_info.src, update_info.dst)
+      else:
+        logging.warning("No transformation for name [%s].", n)
+        errors += 1
+    return errors
+
+  # Construct the set of actions to take.
+  cbb_already = set()
+  unmatched = set()
+  multiples = {}
+  updates = []
+  for path in args.path:
+    if not os.path.isdir(path):
+      raise ValueError("Supplied master directory is not valid: %s" % (path,))
+
+    seen = set()
+    for f in os.listdir(path):
+      f_path = os.path.join(path, f)
+      if not os.path.isdir(f_path):
+        continue
+
+      update_info_list = UpdateInfo.process(cbuildbot_config, f, args.branch)
+      if not update_info_list:
+        logging.info("No update information for directory [%s]", f)
+        unmatched.add(f)
+        continue
+      elif len(update_info_list) != 1:
+        multiples[f] = update_info_list
+        continue
+      update_info = update_info_list[0]
+
+      # Make sure that we don't stomp on directory names. This shouldn't happen,
+      # since the mapping to 'cbuildbot' names is inherently deconflicting, but
+      # it's good to assert it just in case.
+      update_info_names = set((update_info.src, update_info.dst))
+      if update_info_names.intersection(seen):
+        logging.error("Updated names intersect with existing names: %s",
+            ", ".join(update_info_names.intersection(seen)))
+        return 1
+      seen.update(update_info_names)
+
+      # We are already in <cbuildbot>-<branch> format, so do nothing.
+      if update_info.src == update_info.dst:
+        cbb_already.add(update_info.src)
+      else:
+        updates.append((path, update_info))
+
+  # Execute the updates.
+  logging.info("Executing %d updates.", len(updates))
+  for master_dir, update_info in updates:
+    logging.info("Updating [%s]: [%s] => [%s]", master_dir, update_info.src,
+                 update_info.dst)
+    if not args.dry_run:
+      shutil.move(os.path.join(master_dir, update_info.src),
+                  os.path.join(master_dir, update_info.dst))
+  logging.info("Updated %d directories.", len(updates))
+  if logging.getLogger().isEnabledFor(logging.DEBUG):
+    logging.debug("%d directories already matching: %s",
+                  len(cbb_already), ', '.join(sorted(cbb_already)))
+  if unmatched:
+    logging.warning("%d unmatched directories: %s",
+                    len(unmatched), ', '.join(sorted(unmatched)))
+  if multiples:
+    for f in sorted(multiples.iterkeys()):
+      logging.warning("Multiple permutations of [%s]: %s",
+                      f, ", ".join(m.dst for m in multiples[f]))
+  return 0
+
+
+if __name__ == '__main__':
+  logging.basicConfig()
+  sys.exit(main(sys.argv[1:]))