1# Copyright 2016 MongoDB Inc. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15 16# If available, uses Git metadata to decide whether files are out of date. 17 18def generate(env, **kwargs): 19 20 # Grab the existing decider functions out of the environment 21 # so we can invoke them when we can't use Git. 22 base_decider = env.decide_target 23 if (base_decider != env.decide_source): 24 raise Exception("Decider environment seems broken") 25 26 from git import Git 27 thisRepo = Git(env.Dir('#').abspath) 28 currentGitState = thisRepo.ls_files('--stage') 29 lines = currentGitState.split('\n') 30 31 file_sha1_map = {} 32 for line in lines: 33 line_content = line.split() 34 file_sha1_map[env.File(line_content[3]).path] = line_content[1] 35 36 for m in thisRepo.ls_files('-m').split('\n'): 37 if (m): 38 del file_sha1_map[env.File(m).path] 39 40 def is_known_to_git(dependency): 41 return str(dependency) in file_sha1_map 42 43 def git_says_file_is_up_to_date(dependency, prev_ni): 44 gitInfoForDep = file_sha1_map[str(dependency)] 45 46 if prev_ni is None: 47 dependency.get_ninfo().csig = gitInfoForDep 48 return False 49 50 if not(hasattr(prev_ni, 'csig')): 51 prev_ni.csig = gitInfoForDep 52 53 result = gitInfoForDep == prev_ni.csig 54 return result 55 56 def MongoGitDecider(dependency, target, prev_ni): 57 if not is_known_to_git(dependency): 58 return base_decider(dependency, target, prev_ni) 59 return not git_says_file_is_up_to_date(dependency, prev_ni) 60 61 env.Decider(MongoGitDecider) 62 63def exists(env): 64 try: 65 from git import Git 66 Git(env.Dir('#').abspath).ls_files('--stage') 67 return True 68 except: 69 return False 70