| #!/usr/bin/env python |
| # Copyright 2013 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. |
| |
| """Traverses the source tree, parses all found DEPS files, and constructs |
| a dependency rule table to be used by subclasses. |
| |
| The format of the deps file: |
| |
| First you have the normal module-level deps. These are the ones used by |
| gclient. An example would be: |
| |
| deps = { |
| "base":"http://foo.bar/trunk/base" |
| } |
| |
| DEPS files not in the top-level of a module won't need this. Then you |
| have any additional include rules. You can add (using "+") or subtract |
| (using "-") from the previously specified rules (including |
| module-level deps). You can also specify a path that is allowed for |
| now but that we intend to remove, using "!"; this is treated the same |
| as "+" when check_deps is run by our bots, but a presubmit step will |
| show a warning if you add a new include of a file that is only allowed |
| by "!". |
| |
| Note that for .java files, there is currently no difference between |
| "+" and "!", even in the presubmit step. |
| |
| include_rules = [ |
| # Code should be able to use base (it's specified in the module-level |
| # deps above), but nothing in "base/evil" because it's evil. |
| "-base/evil", |
| |
| # But this one subdirectory of evil is OK. |
| "+base/evil/not", |
| |
| # And it can include files from this other directory even though there is |
| # no deps rule for it. |
| "+tools/crime_fighter", |
| |
| # This dependency is allowed for now but work is ongoing to remove it, |
| # so you shouldn't add further dependencies on it. |
| "!base/evil/ok_for_now.h", |
| ] |
| |
| If you have certain include rules that should only be applied for some |
| files within this directory and subdirectories, you can write a |
| section named specific_include_rules that is a hash map of regular |
| expressions to the list of rules that should apply to files matching |
| them. Note that such rules will always be applied before the rules |
| from 'include_rules' have been applied, but the order in which rules |
| associated with different regular expressions is applied is arbitrary. |
| |
| specific_include_rules = { |
| ".*_(unit|browser|api)test\.cc": [ |
| "+libraries/testsupport", |
| ], |
| } |
| |
| DEPS files may be placed anywhere in the tree. Each one applies to all |
| subdirectories, where there may be more DEPS files that provide additions or |
| subtractions for their own sub-trees. |
| |
| There is an implicit rule for the current directory (where the DEPS file lives) |
| and all of its subdirectories. This prevents you from having to explicitly |
| allow the current directory everywhere. This implicit rule is applied first, |
| so you can modify or remove it using the normal include rules. |
| |
| The rules are processed in order. This means you can explicitly allow a higher |
| directory and then take away permissions from sub-parts, or the reverse. |
| |
| Note that all directory separators must be slashes (Unix-style) and not |
| backslashes. All directories should be relative to the source root and use |
| only lowercase. |
| """ |
| |
| import copy |
| import os.path |
| import posixpath |
| import subprocess |
| |
| from rules import Rule, Rules |
| |
| |
| # Variable name used in the DEPS file to add or subtract include files from |
| # the module-level deps. |
| INCLUDE_RULES_VAR_NAME = 'include_rules' |
| |
| # Variable name used in the DEPS file to add or subtract include files |
| # from module-level deps specific to files whose basename (last |
| # component of path) matches a given regular expression. |
| SPECIFIC_INCLUDE_RULES_VAR_NAME = 'specific_include_rules' |
| |
| # Optionally present in the DEPS file to list subdirectories which should not |
| # be checked. This allows us to skip third party code, for example. |
| SKIP_SUBDIRS_VAR_NAME = 'skip_child_includes' |
| |
| |
| def NormalizePath(path): |
| """Returns a path normalized to how we write DEPS rules and compare paths.""" |
| return os.path.normcase(path).replace(os.path.sep, posixpath.sep) |
| |
| |
| def _GitSourceDirectories(base_directory): |
| """Returns set of normalized paths to subdirectories containing sources |
| managed by git.""" |
| if not os.path.exists(os.path.join(base_directory, '.git')): |
| return set() |
| |
| base_dir_norm = NormalizePath(base_directory) |
| git_source_directories = set([base_dir_norm]) |
| |
| git_ls_files_cmd = ['git', 'ls-files'] |
| # FIXME: Use a context manager in Python 3.2+ |
| popen = subprocess.Popen(git_ls_files_cmd, |
| stdout=subprocess.PIPE, |
| bufsize=1, # line buffering, since read by line |
| cwd=base_directory) |
| try: |
| try: |
| for line in popen.stdout: |
| dir_path = os.path.join(base_directory, os.path.dirname(line)) |
| dir_path_norm = NormalizePath(dir_path) |
| # Add the directory as well as all the parent directories, |
| # stopping once we reach an already-listed directory. |
| while dir_path_norm not in git_source_directories: |
| git_source_directories.add(dir_path_norm) |
| dir_path_norm = posixpath.dirname(dir_path_norm) |
| finally: |
| popen.stdout.close() |
| finally: |
| popen.wait() |
| |
| return git_source_directories |
| |
| |
| class DepsBuilder(object): |
| """Parses include_rules from DEPS files.""" |
| |
| def __init__(self, |
| base_directory=None, |
| verbose=False, |
| being_tested=False, |
| ignore_temp_rules=False, |
| ignore_specific_rules=False): |
| """Creates a new DepsBuilder. |
| |
| Args: |
| base_directory: local path to root of checkout, e.g. C:\chr\src. |
| verbose: Set to True for debug output. |
| being_tested: Set to True to ignore the DEPS file at tools/checkdeps/DEPS. |
| ignore_temp_rules: Ignore rules that start with Rule.TEMP_ALLOW ("!"). |
| """ |
| base_directory = (base_directory or |
| os.path.join(os.path.dirname(__file__), |
| os.path.pardir, os.path.pardir)) |
| self.base_directory = os.path.abspath(base_directory) # Local absolute path |
| self.verbose = verbose |
| self._under_test = being_tested |
| self._ignore_temp_rules = ignore_temp_rules |
| self._ignore_specific_rules = ignore_specific_rules |
| |
| # Set of normalized paths |
| self.git_source_directories = _GitSourceDirectories(self.base_directory) |
| |
| # Map of normalized directory paths to rules to use for those |
| # directories, or None for directories that should be skipped. |
| # Normalized is: absolute, lowercase, / for separator. |
| self.directory_rules = {} |
| self._ApplyDirectoryRulesAndSkipSubdirs(Rules(), self.base_directory) |
| |
| def _ApplyRules(self, existing_rules, includes, specific_includes, |
| cur_dir_norm): |
| """Applies the given include rules, returning the new rules. |
| |
| Args: |
| existing_rules: A set of existing rules that will be combined. |
| include: The list of rules from the "include_rules" section of DEPS. |
| specific_includes: E.g. {'.*_unittest\.cc': ['+foo', '-blat']} rules |
| from the "specific_include_rules" section of DEPS. |
| cur_dir_norm: The current directory, normalized path. We will create an |
| implicit rule that allows inclusion from this directory. |
| |
| Returns: A new set of rules combining the existing_rules with the other |
| arguments. |
| """ |
| rules = copy.deepcopy(existing_rules) |
| |
| # First apply the implicit "allow" rule for the current directory. |
| base_dir_norm = NormalizePath(self.base_directory) |
| if not cur_dir_norm.startswith(base_dir_norm): |
| raise Exception( |
| 'Internal error: base directory is not at the beginning for\n' |
| ' %s and base dir\n' |
| ' %s' % (cur_dir_norm, base_dir_norm)) |
| relative_dir = posixpath.relpath(cur_dir_norm, base_dir_norm) |
| |
| # Make the help string a little more meaningful. |
| source = relative_dir or 'top level' |
| rules.AddRule('+' + relative_dir, |
| relative_dir, |
| 'Default rule for ' + source) |
| |
| def ApplyOneRule(rule_str, dependee_regexp=None): |
| """Deduces a sensible description for the rule being added, and |
| adds the rule with its description to |rules|. |
| |
| If we are ignoring temporary rules, this function does nothing |
| for rules beginning with the Rule.TEMP_ALLOW character. |
| """ |
| if self._ignore_temp_rules and rule_str.startswith(Rule.TEMP_ALLOW): |
| return |
| |
| rule_block_name = 'include_rules' |
| if dependee_regexp: |
| rule_block_name = 'specific_include_rules' |
| if relative_dir: |
| rule_description = relative_dir + "'s %s" % rule_block_name |
| else: |
| rule_description = 'the top level %s' % rule_block_name |
| rules.AddRule(rule_str, relative_dir, rule_description, dependee_regexp) |
| |
| # Apply the additional explicit rules. |
| for rule_str in includes: |
| ApplyOneRule(rule_str) |
| |
| # Finally, apply the specific rules. |
| if self._ignore_specific_rules: |
| return rules |
| |
| for regexp, specific_rules in specific_includes.iteritems(): |
| for rule_str in specific_rules: |
| ApplyOneRule(rule_str, regexp) |
| |
| return rules |
| |
| def _ApplyDirectoryRules(self, existing_rules, dir_path_local_abs): |
| """Combines rules from the existing rules and the new directory. |
| |
| Any directory can contain a DEPS file. Top-level DEPS files can contain |
| module dependencies which are used by gclient. We use these, along with |
| additional include rules and implicit rules for the given directory, to |
| come up with a combined set of rules to apply for the directory. |
| |
| Args: |
| existing_rules: The rules for the parent directory. We'll add-on to these. |
| dir_path_local_abs: The directory path that the DEPS file may live in (if |
| it exists). This will also be used to generate the |
| implicit rules. This is a local path. |
| |
| Returns: A 2-tuple of: |
| (1) the combined set of rules to apply to the sub-tree, |
| (2) a list of all subdirectories that should NOT be checked, as specified |
| in the DEPS file (if any). |
| Subdirectories are single words, hence no OS dependence. |
| """ |
| dir_path_norm = NormalizePath(dir_path_local_abs) |
| |
| # Check for a .svn directory in this directory or that this directory is |
| # contained in git source directories. This will tell us if it's a source |
| # directory and should be checked. |
| if not (os.path.exists(os.path.join(dir_path_local_abs, '.svn')) or |
| dir_path_norm in self.git_source_directories): |
| return None, [] |
| |
| # Check the DEPS file in this directory. |
| if self.verbose: |
| print 'Applying rules from', dir_path_local_abs |
| def FromImpl(*_): |
| pass # NOP function so "From" doesn't fail. |
| |
| def FileImpl(_): |
| pass # NOP function so "File" doesn't fail. |
| |
| class _VarImpl: |
| def __init__(self, local_scope): |
| self._local_scope = local_scope |
| |
| def Lookup(self, var_name): |
| """Implements the Var syntax.""" |
| try: |
| return self._local_scope['vars'][var_name] |
| except KeyError: |
| raise Exception('Var is not defined: %s' % var_name) |
| |
| local_scope = {} |
| global_scope = { |
| 'File': FileImpl, |
| 'From': FromImpl, |
| 'Var': _VarImpl(local_scope).Lookup, |
| } |
| deps_file_path = os.path.join(dir_path_local_abs, 'DEPS') |
| |
| # The second conditional here is to disregard the |
| # tools/checkdeps/DEPS file while running tests. This DEPS file |
| # has a skip_child_includes for 'testdata' which is necessary for |
| # running production tests, since there are intentional DEPS |
| # violations under the testdata directory. On the other hand when |
| # running tests, we absolutely need to verify the contents of that |
| # directory to trigger those intended violations and see that they |
| # are handled correctly. |
| if os.path.isfile(deps_file_path) and not ( |
| self._under_test and |
| os.path.basename(dir_path_local_abs) == 'checkdeps'): |
| execfile(deps_file_path, global_scope, local_scope) |
| elif self.verbose: |
| print ' No deps file found in', dir_path_local_abs |
| |
| # Even if a DEPS file does not exist we still invoke ApplyRules |
| # to apply the implicit "allow" rule for the current directory |
| include_rules = local_scope.get(INCLUDE_RULES_VAR_NAME, []) |
| specific_include_rules = local_scope.get(SPECIFIC_INCLUDE_RULES_VAR_NAME, |
| {}) |
| skip_subdirs = local_scope.get(SKIP_SUBDIRS_VAR_NAME, []) |
| |
| return (self._ApplyRules(existing_rules, include_rules, |
| specific_include_rules, dir_path_norm), |
| skip_subdirs) |
| |
| def _ApplyDirectoryRulesAndSkipSubdirs(self, parent_rules, |
| dir_path_local_abs): |
| """Given |parent_rules| and a subdirectory |dir_path_local_abs| of the |
| directory that owns the |parent_rules|, add |dir_path_local_abs|'s rules to |
| |self.directory_rules|, and add None entries for any of its |
| subdirectories that should be skipped. |
| """ |
| directory_rules, excluded_subdirs = self._ApplyDirectoryRules( |
| parent_rules, dir_path_local_abs) |
| dir_path_norm = NormalizePath(dir_path_local_abs) |
| self.directory_rules[dir_path_norm] = directory_rules |
| for subdir in excluded_subdirs: |
| subdir_path_norm = posixpath.join(dir_path_norm, subdir) |
| self.directory_rules[subdir_path_norm] = None |
| |
| def GetDirectoryRules(self, dir_path_local): |
| """Returns a Rules object to use for the given directory, or None |
| if the given directory should be skipped. |
| |
| Also modifies |self.directory_rules| to store the Rules. |
| This takes care of first building rules for parent directories (up to |
| |self.base_directory|) if needed, which may add rules for skipped |
| subdirectories. |
| |
| Args: |
| dir_path_local: A local path to the directory you want rules for. |
| Can be relative and unnormalized. |
| """ |
| if os.path.isabs(dir_path_local): |
| dir_path_local_abs = dir_path_local |
| else: |
| dir_path_local_abs = os.path.join(self.base_directory, dir_path_local) |
| dir_path_norm = NormalizePath(dir_path_local_abs) |
| |
| if dir_path_norm in self.directory_rules: |
| return self.directory_rules[dir_path_norm] |
| |
| parent_dir_local_abs = os.path.dirname(dir_path_local_abs) |
| parent_rules = self.GetDirectoryRules(parent_dir_local_abs) |
| # We need to check for an entry for our dir_path again, since |
| # GetDirectoryRules can modify entries for subdirectories, namely setting |
| # to None if they should be skipped, via _ApplyDirectoryRulesAndSkipSubdirs. |
| # For example, if dir_path == 'A/B/C' and A/B/DEPS specifies that the C |
| # subdirectory be skipped, GetDirectoryRules('A/B') will fill in the entry |
| # for 'A/B/C' as None. |
| if dir_path_norm in self.directory_rules: |
| return self.directory_rules[dir_path_norm] |
| |
| if parent_rules: |
| self._ApplyDirectoryRulesAndSkipSubdirs(parent_rules, dir_path_local_abs) |
| else: |
| # If the parent directory should be skipped, then the current |
| # directory should also be skipped. |
| self.directory_rules[dir_path_norm] = None |
| return self.directory_rules[dir_path_norm] |