287 lines
11 KiB
Python
287 lines
11 KiB
Python
# Copyright (c) 2013-2016 Hewlett-Packard Development Company, L.P.
|
|
# Copyright (c) 2018 Hewlett Packard Enterprise Development Company LP
|
|
#
|
|
# 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.
|
|
|
|
import faker
|
|
import os
|
|
import shutil
|
|
import tempfile
|
|
|
|
import fixtures
|
|
import git
|
|
|
|
from fixtures_git import utils
|
|
|
|
|
|
class GitTree(object):
|
|
"""Helper class to build a git repository from a graph definition
|
|
|
|
Helper class to build a git repository from a graph definition of
|
|
nodes and their parent nodes. A list of branches may be provided
|
|
where each element has two members corresponding to the name and the
|
|
target node it references.
|
|
|
|
Supports unordered graphs, only requirement is that there is a commit
|
|
defined with no parents, which will become the root commit.
|
|
|
|
Root commits can specified by an empty list as the second member:
|
|
|
|
('NodeA', [])
|
|
|
|
Merge commits are specified by multiple nodes:
|
|
|
|
('NodeMerge', ['Node1', 'Node2'])
|
|
|
|
|
|
An '=' prefix can be used in front of one of the parents of a merge
|
|
commit to indicate that the merge commit's tree should be copied
|
|
directly from that parent ignoring any contributions from the other
|
|
parents' trees (like what git enables with the '-s ours' merge
|
|
strategy.
|
|
|
|
This is used when needing to preserve history but not interested in
|
|
the changes from the other branches. One tool that makes extensive
|
|
usage of this is _git-upstream.
|
|
|
|
E.g., the following will result in a merge commit 'C', with parents
|
|
'P1' and 'P2', but will have the same tree as 'P1'.
|
|
|
|
('C', ['=P1', 'P2'])
|
|
|
|
|
|
The tree building code can handle a graph definition being out of
|
|
order but will fail to find certain circular dependencies and may
|
|
result in an infinite loop.
|
|
|
|
Examples:
|
|
|
|
[('A', []), ('B', ['A']), ('C', ['B'])]
|
|
[('A', []), ('C', ['B']), ('B', ['A'])]
|
|
|
|
.. _git-upstream: https://pypi.python.org/pypi/git-upstream
|
|
"""
|
|
|
|
def __init__(self, gitrepo, tree, branches):
|
|
self.graph = {}
|
|
self.gitrepo = gitrepo
|
|
self.repo = gitrepo.repo
|
|
self._build_git_tree(tree, branches)
|
|
|
|
def _commit(self, node):
|
|
p_node = utils._get_node_to_pick(node)
|
|
if p_node:
|
|
self.repo.git.cherry_pick(self.graph[p_node], x=True)
|
|
else:
|
|
# standard commit
|
|
self.gitrepo.add_commits(1, ref="HEAD",
|
|
message_prefix="[%s]" % node)
|
|
|
|
def _merge_commit(self, node, parents):
|
|
# merge commits
|
|
parent_nodes = [p.lstrip("=") for p in parents]
|
|
commits = [str(self.graph[p]) for p in parent_nodes[1:]]
|
|
|
|
if any([p.startswith("=") for p in parents]):
|
|
# special merge commit using inverse of 'ours' by
|
|
# emptying the current index and then reading in any
|
|
# trees of the nodes prefixed with '='
|
|
use = [str(self.graph[p.lstrip("=")])
|
|
for p in parents if p.startswith("=")]
|
|
try:
|
|
self.repo.git.merge(*commits, s="ours", no_commit=True)
|
|
except git.exc.GitCommandError as exc:
|
|
if 'refusing to merge unrelated histories' in exc.stderr:
|
|
self.repo.git.merge(*commits, s="ours", no_commit=True,
|
|
allow_unrelated_histories=True)
|
|
else:
|
|
raise
|
|
self.repo.git.read_tree(empty=True)
|
|
self.repo.git.read_tree(empty=True)
|
|
self.repo.git.read_tree(*use, u=True, reset=True)
|
|
elif len(commits) < 2:
|
|
# standard merge
|
|
try:
|
|
self.repo.git.merge(*commits, no_commit=True)
|
|
except git.exc.GitCommandError as exc:
|
|
if 'refusing to merge unrelated histories' in exc.stderr:
|
|
self.repo.git.merge(*commits, no_commit=True,
|
|
allow_unrelated_histories=True)
|
|
else:
|
|
raise
|
|
else:
|
|
# multi-branch merge, git is not great at handling
|
|
# merging multiple orphaned branches
|
|
try:
|
|
self.repo.git.merge(*commits, s="ours", no_commit=True)
|
|
except git.exc.GitCommandError as exc:
|
|
if 'refusing to merge unrelated histories' in exc.stderr:
|
|
self.repo.git.merge(*commits, s="ours", no_commit=True,
|
|
allow_unrelated_histories=True)
|
|
else:
|
|
raise
|
|
self.repo.git.read_tree(empty=True)
|
|
self.repo.git.read_tree("HEAD", *commits)
|
|
self.repo.git.checkout("--", ".")
|
|
self.repo.git.commit(m="[%s] Merging %s into %s" %
|
|
(node, ",".join(parent_nodes[1:]),
|
|
parent_nodes[0]))
|
|
self.repo.git.clean(f=True, d=True, x=True)
|
|
|
|
def _build_git_tree(self, graph_def, branches=[]):
|
|
|
|
# require that graphs must have at least 1 node with no
|
|
# parents, which is a root commit in git
|
|
if not any([True for _, parents in graph_def if not parents]):
|
|
assert("No root commit defined in test graph")
|
|
|
|
for node, parents in utils._reverse_toposort(graph_def):
|
|
if not parents:
|
|
# root commit
|
|
self.repo.git.symbolic_ref("HEAD", "refs/heads/%s" % node)
|
|
self.repo.git.rm(".", r=True, cached=True,
|
|
with_exceptions=False)
|
|
self.repo.git.clean(f=True, d=True, x=True)
|
|
self.gitrepo.add_commits(1, ref="HEAD",
|
|
message_prefix="[%s]" % node)
|
|
# only explicitly listed branches should exist afterwards
|
|
self.repo.git.checkout(self.repo.commit())
|
|
self.repo.git.branch(node, D=True)
|
|
|
|
else:
|
|
# checkout the dependent node
|
|
self.repo.git.checkout(self.graph[parents[0].lstrip('=')])
|
|
if len(parents) > 1:
|
|
# merge commits
|
|
self._merge_commit(node, parents)
|
|
else:
|
|
self._commit(node)
|
|
self.graph[node] = self.repo.commit()
|
|
|
|
for name, node in branches:
|
|
self.repo.git.branch(name, str(self.graph[node]), f=True)
|
|
|
|
# return to master
|
|
self.repo.git.checkout("master")
|
|
|
|
def commits_from_nodes(self, nodes=[]):
|
|
|
|
return [self.graph[n] for n in nodes]
|
|
|
|
|
|
class GitFixture(fixtures.Fixture):
|
|
"""Create a git repo in which to operate.
|
|
|
|
By default creates an empty git repository under a temporary
|
|
directory and deletes it after use.
|
|
|
|
It accepts options to automatically define a git repository
|
|
layout based on list of commits setting the given branches to
|
|
the relevant node once built.
|
|
|
|
:ivar graph: Iterable describing the tree of git commits to create.
|
|
:ivar branches: Dict of node to branch names to set once finished.
|
|
:ivar path: Custom path to use, otherwise will create a temporary
|
|
directory to use and set the 'path' attribute to it.
|
|
:ivar user: Dict describing a user to use for commits, defaults
|
|
to 'Example User <user@example.com>',
|
|
:ivar clean_on_exit: Control whether to delete the tempoary path
|
|
once complete, defaults to 'True', but is ignored if 'path'
|
|
is provided.
|
|
"""
|
|
|
|
def __init__(self, graph=None, branches=None, path=None, user=None,
|
|
clean_on_exit=True):
|
|
# set attributes for use
|
|
self.path = path
|
|
self.gittree = None
|
|
self.repo = None
|
|
|
|
# internal attributes
|
|
self._graph = graph or []
|
|
self._branches = branches or []
|
|
self._user = {
|
|
'name': 'Example User',
|
|
'email': 'user@example.com',
|
|
}
|
|
self._user.update(user or {})
|
|
|
|
self._clean_on_exit = clean_on_exit
|
|
# for text generation
|
|
self._faker = faker.Faker()
|
|
|
|
def _setUp(self):
|
|
self._file_list = set()
|
|
if not self.path:
|
|
tempdir = self.useFixture(fixtures.TempDir())
|
|
self.path = os.path.join(tempdir.path, 'git')
|
|
if self._clean_on_exit is True:
|
|
self.addCleanup(shutil.rmtree, tempdir.path)
|
|
|
|
os.mkdir(self.path)
|
|
g = git.Git(self.path)
|
|
g.init()
|
|
|
|
self.repo = git.Repo(self.path)
|
|
self.repo.git.config('user.email', self._user['email'])
|
|
self.repo.git.config('user.name', self._user['name'])
|
|
self.repo.git.commit(m="Initialize empty repo", allow_empty=True)
|
|
|
|
if self._graph:
|
|
self.gittree = GitTree(self, self._graph, self._branches)
|
|
|
|
def _create_file(self):
|
|
contents = "\n\n".join(self._faker.paragraphs(3))
|
|
|
|
# always want to ensure the files added to the repo are unique no
|
|
# matter which branch they are added to, as otherwise there may
|
|
# be conflicts caused by replaying local changes and performing
|
|
# merges
|
|
while True:
|
|
tmpfile = tempfile.NamedTemporaryFile(
|
|
dir=self.repo.working_dir, delete=False)
|
|
if tmpfile.name not in self._file_list:
|
|
self._file_list.add(tmpfile.name)
|
|
break
|
|
# case where same filename in use on a different branch
|
|
tmpfile.close()
|
|
os.remove(tmpfile.name)
|
|
|
|
tmpfile.write(contents.encode('utf-8'))
|
|
tmpfile.close()
|
|
return tmpfile.name
|
|
|
|
def _create_file_commit(self, change_id=None, message_prefix=None):
|
|
filename = self._create_file()
|
|
self.repo.git.add(filename)
|
|
message = "Adding %s" % os.path.basename(filename)
|
|
if message_prefix:
|
|
message = "%s %s" % (message_prefix, message)
|
|
if change_id:
|
|
message = message + "\n\nChange-Id: %s" % change_id
|
|
self.repo.git.commit(m=message)
|
|
|
|
def add_commits(self, num=None, ref="HEAD", change_ids=[],
|
|
message_prefix=None):
|
|
"""Create the given number of commits using generated files"""
|
|
if ref != "HEAD":
|
|
self.repo.git.checkout(ref)
|
|
|
|
if num is None:
|
|
num = max(1, len(change_ids))
|
|
ids = list(change_ids) + [None] * (num - len(change_ids))
|
|
|
|
for x in range(num):
|
|
self._create_file_commit(
|
|
change_id=ids[x], message_prefix=message_prefix)
|