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# Copyright 2016 MongoDB Inc.
#
# 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.
# If available, uses Git metadata to decide whether files are out of date.
def generate(env, **kwargs):
# Grab the existing decider functions out of the environment
# so we can invoke them when we can't use Git.
base_decider = env.decide_target
if base_decider != env.decide_source:
raise Exception("Decider environment seems broken")
from git import Git
thisRepo = Git(env.Dir("#").abspath)
currentGitState = thisRepo.ls_files("--stage")
lines = currentGitState.split("\n")
file_sha1_map = {}
for line in lines:
line_content = line.split()
file_sha1_map[env.File(line_content[3]).path] = line_content[1]
for m in thisRepo.ls_files("-m").split("\n"):
if m:
del file_sha1_map[env.File(m).path]
def is_known_to_git(dependency):
return str(dependency) in file_sha1_map
def git_says_file_is_up_to_date(dependency, prev_ni):
gitInfoForDep = file_sha1_map[str(dependency)]
if prev_ni is None:
dependency.get_ninfo().csig = gitInfoForDep
return False
if not (hasattr(prev_ni, "csig")):
prev_ni.csig = gitInfoForDep
result = gitInfoForDep == prev_ni.csig
return result
def MongoGitDecider(dependency, target, prev_ni, node):
if not is_known_to_git(dependency):
return base_decider(dependency, target, prev_ni, node)
return not git_says_file_is_up_to_date(dependency, prev_ni)
env.Decider(MongoGitDecider)
def exists(env):
try:
from git import Git
Git(env.Dir("#").abspath).ls_files("--stage")
return True
except:
return False
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