test_repo.py

# -*- coding: utf-8 -*-
# test_repo.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under
# the BSD License: http://www.opensource.org/licenses/bsd-license.php
import glob
import io
from io import BytesIO
import itertools
import os
import pathlib
import pickle
import sys
import tempfile
import uuid
from unittest import mock, skipIf, SkipTest

import pytest

from git import (
    InvalidGitRepositoryError,
    Repo,
    NoSuchPathError,
    Head,
    Commit,
    Object,
    Tree,
    IndexFile,
    Git,
    Reference,
    GitDB,
    Submodule,
    GitCmdObjectDB,
    Remote,
    BadName,
    GitCommandError,
)
from git.exc import (
    BadObject,
)
from git.repo.fun import touch
from test.lib import TestBase, with_rw_repo, fixture
from git.util import HIDE_WINDOWS_KNOWN_ERRORS, cygpath
from test.lib import with_rw_directory
from git.util import join_path_native, rmtree, rmfile, bin_to_hex

import os.path as osp


def iter_flatten(lol):
    for items in lol:
        for item in items:
            yield item


def flatten(lol):
    return list(iter_flatten(lol))


_tc_lock_fpaths = osp.join(osp.dirname(__file__), "../../.git/*.lock")


def _rm_lock_files():
    for lfp in glob.glob(_tc_lock_fpaths):
        rmfile(lfp)


class TestRepo(TestBase):
    def setUp(self):
        _rm_lock_files()

    def tearDown(self):
        for lfp in glob.glob(_tc_lock_fpaths):
            if osp.isfile(lfp):
                raise AssertionError("Previous TC left hanging git-lock file: {}".format(lfp))
        import gc

        gc.collect()

    def test_new_should_raise_on_invalid_repo_location(self):
        self.assertRaises(InvalidGitRepositoryError, Repo, tempfile.gettempdir())

    def test_new_should_raise_on_non_existent_path(self):
        self.assertRaises(NoSuchPathError, Repo, "repos/foobar")

    @with_rw_repo("0.3.2.1")
    def test_repo_creation_from_different_paths(self, rw_repo):
        r_from_gitdir = Repo(rw_repo.git_dir)
        self.assertEqual(r_from_gitdir.git_dir, rw_repo.git_dir)
        assert r_from_gitdir.git_dir.endswith(".git")
        assert not rw_repo.git.working_dir.endswith(".git")
        self.assertEqual(r_from_gitdir.git.working_dir, rw_repo.git.working_dir)

    @with_rw_repo("0.3.2.1")
    def test_repo_creation_pathlib(self, rw_repo):
        r_from_gitdir = Repo(pathlib.Path(rw_repo.git_dir))
        self.assertEqual(r_from_gitdir.git_dir, rw_repo.git_dir)

    def test_description(self):
        txt = "Test repository"
        self.rorepo.description = txt
        self.assertEqual(self.rorepo.description, txt)

    def test_heads_should_return_array_of_head_objects(self):
        for head in self.rorepo.heads:
            self.assertEqual(Head, head.__class__)

    def test_heads_should_populate_head_data(self):
        for head in self.rorepo.heads:
            assert head.name
            self.assertIsInstance(head.commit, Commit)
        # END for each head

        self.assertIsInstance(self.rorepo.heads.master, Head)
        self.assertIsInstance(self.rorepo.heads["master"], Head)

    def test_tree_from_revision(self):
        tree = self.rorepo.tree("0.1.6")
        self.assertEqual(len(tree.hexsha), 40)
        self.assertEqual(tree.type, "tree")
        self.assertEqual(self.rorepo.tree(tree), tree)

        # try from invalid revision that does not exist
        self.assertRaises(BadName, self.rorepo.tree, "hello world")

    def test_pickleable(self):
        pickle.loads(pickle.dumps(self.rorepo))

    def test_commit_from_revision(self):
        commit = self.rorepo.commit("0.1.4")
        self.assertEqual(commit.type, "commit")
        self.assertEqual(self.rorepo.commit(commit), commit)

    def test_commits(self):
        mc = 10
        commits = list(self.rorepo.iter_commits("0.1.6", max_count=mc))
        self.assertEqual(len(commits), mc)

        c = commits[0]
        self.assertEqual("9a4b1d4d11eee3c5362a4152216376e634bd14cf", c.hexsha)
        self.assertEqual(["c76852d0bff115720af3f27acdb084c59361e5f6"], [p.hexsha for p in c.parents])
        self.assertEqual("ce41fc29549042f1aa09cc03174896cf23f112e3", c.tree.hexsha)
        self.assertEqual("Michael Trier", c.author.name)
        self.assertEqual("mtrier@gmail.com", c.author.email)
        self.assertEqual(1232829715, c.authored_date)
        self.assertEqual(5 * 3600, c.author_tz_offset)
        self.assertEqual("Michael Trier", c.committer.name)
        self.assertEqual("mtrier@gmail.com", c.committer.email)
        self.assertEqual(1232829715, c.committed_date)
        self.assertEqual(5 * 3600, c.committer_tz_offset)
        self.assertEqual("Bumped version 0.1.6\n", c.message)

        c = commits[1]
        self.assertIsInstance(c.parents, tuple)

    def test_trees(self):
        mc = 30
        num_trees = 0
        for tree in self.rorepo.iter_trees("0.1.5", max_count=mc):
            num_trees += 1
            self.assertIsInstance(tree, Tree)
        # END for each tree
        self.assertEqual(num_trees, mc)

    def _assert_empty_repo(self, repo):
        # test all kinds of things with an empty, freshly initialized repo.
        # It should throw good errors

        # entries should be empty
        self.assertEqual(len(repo.index.entries), 0)

        # head is accessible
        assert repo.head
        assert repo.head.ref
        assert not repo.head.is_valid()

        # we can change the head to some other ref
        head_ref = Head.from_path(repo, Head.to_full_path("some_head"))
        assert not head_ref.is_valid()
        repo.head.ref = head_ref

        # is_dirty can handle all kwargs
        for args in ((1, 0, 0), (0, 1, 0), (0, 0, 1)):
            assert not repo.is_dirty(*args)
        # END for each arg

        # we can add a file to the index ( if we are not bare )
        if not repo.bare:
            pass
        # END test repos with working tree

    @with_rw_directory
    def test_clone_from_keeps_env(self, rw_dir):
        original_repo = Repo.init(osp.join(rw_dir, "repo"))
        environment = {"entry1": "value", "another_entry": "10"}

        cloned = Repo.clone_from(original_repo.git_dir, osp.join(rw_dir, "clone"), env=environment)

        self.assertEqual(environment, cloned.git.environment())

    @with_rw_directory
    def test_date_format(self, rw_dir):
        repo = Repo.init(osp.join(rw_dir, "repo"))
        # @-timestamp is the format used by git commit hooks
        repo.index.commit("Commit messages", commit_date="@1400000000 +0000")

    @with_rw_directory
    def test_clone_from_pathlib(self, rw_dir):
        original_repo = Repo.init(osp.join(rw_dir, "repo"))

        Repo.clone_from(original_repo.git_dir, pathlib.Path(rw_dir) / "clone_pathlib")

    @with_rw_directory
    def test_clone_from_pathlib_withConfig(self, rw_dir):
        original_repo = Repo.init(osp.join(rw_dir, "repo"))

        cloned = Repo.clone_from(
            original_repo.git_dir,
            pathlib.Path(rw_dir) / "clone_pathlib_withConfig",
            multi_options=[
                "--recurse-submodules=repo",
                "--config core.filemode=false",
                "--config submodule.repo.update=checkout",
                "--config filter.lfs.clean='git-lfs clean -- %f'",
            ],
        )

        self.assertEqual(cloned.config_reader().get_value("submodule", "active"), "repo")
        self.assertEqual(cloned.config_reader().get_value("core", "filemode"), False)
        self.assertEqual(cloned.config_reader().get_value('submodule "repo"', "update"), "checkout")
        self.assertEqual(
            cloned.config_reader().get_value('filter "lfs"', "clean"),
            "git-lfs clean -- %f",
        )

    def test_clone_from_with_path_contains_unicode(self):
        with tempfile.TemporaryDirectory() as tmpdir:
            unicode_dir_name = "\u0394"
            path_with_unicode = os.path.join(tmpdir, unicode_dir_name)
            os.makedirs(path_with_unicode)

            try:
                Repo.clone_from(
                    url=self._small_repo_url(),
                    to_path=path_with_unicode,
                )
            except UnicodeEncodeError:
                self.fail("Raised UnicodeEncodeError")

    @with_rw_directory
    def test_leaking_password_in_clone_logs(self, rw_dir):
        password = "fakepassword1234"
        try:
            Repo.clone_from(
                url="https://fakeuser:{}@fakerepo.example.com/testrepo".format(password),
                to_path=rw_dir,
            )
        except GitCommandError as err:
            assert password not in str(err), "The error message '%s' should not contain the password" % err
        # Working example from a blank private project
        Repo.clone_from(
            url="https://gitlab+deploy-token-392045:mLWhVus7bjLsy8xj8q2V@gitlab.com/mercierm/test_git_python",
            to_path=rw_dir,
        )

    @with_rw_repo("HEAD")
    def test_clone_from_quotes_urls_by_default(self, repo):
        bad_filename = f'{tempfile.gettempdir()}/{uuid.uuid4()}'
        bad_url = f'ext::sh -c touch% {bad_filename}'
        try:
            repo.clone_from(
                bad_url, 'tmp', multi_options=["-c protocol.ext.allow=always"]
            )
        except GitCommandError:
            pass
        self.assertFalse(pathlib.Path(bad_filename).is_file())

    @with_rw_repo("HEAD")
    def test_max_chunk_size(self, repo):
        class TestOutputStream(TestBase):
            def __init__(self, max_chunk_size):
                self.max_chunk_size = max_chunk_size

            def write(self, b):
                self.assertTrue(len(b) <= self.max_chunk_size)

        for chunk_size in [16, 128, 1024]:
            repo.git.status(output_stream=TestOutputStream(chunk_size), max_chunk_size=chunk_size)

        repo.git.log(
            n=100,
            output_stream=TestOutputStream(io.DEFAULT_BUFFER_SIZE),
            max_chunk_size=None,
        )
        repo.git.log(
            n=100,
            output_stream=TestOutputStream(io.DEFAULT_BUFFER_SIZE),
            max_chunk_size=-10,
        )
        repo.git.log(n=100, output_stream=TestOutputStream(io.DEFAULT_BUFFER_SIZE))

    def test_init(self):
        prev_cwd = os.getcwd()
        os.chdir(tempfile.gettempdir())
        git_dir_rela = "repos/foo/bar.git"
        del_dir_abs = osp.abspath("repos")
        git_dir_abs = osp.abspath(git_dir_rela)
        try:
            # with specific path
            for path in (git_dir_rela, git_dir_abs):
                r = Repo.init(path=path, bare=True)
                self.assertIsInstance(r, Repo)
                assert r.bare is True
                assert not r.has_separate_working_tree()
                assert osp.isdir(r.git_dir)

                self._assert_empty_repo(r)

                # test clone
                clone_path = path + "_clone"
                rc = r.clone(clone_path)
                self._assert_empty_repo(rc)

                try:
                    rmtree(clone_path)
                except OSError:
                    # when relative paths are used, the clone may actually be inside
                    # of the parent directory
                    pass
                # END exception handling

                # try again, this time with the absolute version
                rc = Repo.clone_from(r.git_dir, clone_path)
                self._assert_empty_repo(rc)

                rmtree(git_dir_abs)
                try:
                    rmtree(clone_path)
                except OSError:
                    # when relative paths are used, the clone may actually be inside
                    # of the parent directory
                    pass
                # END exception handling

            # END for each path

            os.makedirs(git_dir_rela)
            os.chdir(git_dir_rela)
            r = Repo.init(bare=False)
            assert r.bare is False
            assert not r.has_separate_working_tree()

            self._assert_empty_repo(r)
        finally:
            try:
                rmtree(del_dir_abs)
            except OSError:
                pass
            os.chdir(prev_cwd)
        # END restore previous state

    def test_bare_property(self):
        self.rorepo.bare

    def test_daemon_export(self):
        orig_val = self.rorepo.daemon_export
        self.rorepo.daemon_export = not orig_val
        self.assertEqual(self.rorepo.daemon_export, (not orig_val))
        self.rorepo.daemon_export = orig_val
        self.assertEqual(self.rorepo.daemon_export, orig_val)

    def test_alternates(self):
        cur_alternates = self.rorepo.alternates
        # empty alternates
        self.rorepo.alternates = []
        self.assertEqual(self.rorepo.alternates, [])
        alts = ["other/location", "this/location"]
        self.rorepo.alternates = alts
        self.assertEqual(alts, self.rorepo.alternates)
        self.rorepo.alternates = cur_alternates

    def test_repr(self):
        assert repr(self.rorepo).startswith("<git.repo.base.Repo ")

    def test_is_dirty_with_bare_repository(self):
        orig_value = self.rorepo._bare
        self.rorepo._bare = True
        self.assertFalse(self.rorepo.is_dirty())
        self.rorepo._bare = orig_value

    def test_is_dirty(self):
        self.rorepo._bare = False
        for index in (0, 1):
            for working_tree in (0, 1):
                for untracked_files in (0, 1):
                    assert self.rorepo.is_dirty(index, working_tree, untracked_files) in (True, False)
                # END untracked files
            # END working tree
        # END index
        orig_val = self.rorepo._bare
        self.rorepo._bare = True
        assert self.rorepo.is_dirty() is False
        self.rorepo._bare = orig_val

    def test_is_dirty_pathspec(self):
        self.rorepo._bare = False
        for index in (0, 1):
            for working_tree in (0, 1):
                for untracked_files in (0, 1):
                    assert self.rorepo.is_dirty(index, working_tree, untracked_files, path=":!foo") in (True, False)
                # END untracked files
            # END working tree
        # END index
        orig_val = self.rorepo._bare
        self.rorepo._bare = True
        assert self.rorepo.is_dirty() is False
        self.rorepo._bare = orig_val

    @with_rw_repo("HEAD")
    def test_is_dirty_with_path(self, rwrepo):
        assert rwrepo.is_dirty(path="git") is False

        with open(osp.join(rwrepo.working_dir, "git", "util.py"), "at") as f:
            f.write("junk")
        assert rwrepo.is_dirty(path="git") is True
        assert rwrepo.is_dirty(path="doc") is False

        rwrepo.git.add(Git.polish_url(osp.join("git", "util.py")))
        assert rwrepo.is_dirty(index=False, path="git") is False
        assert rwrepo.is_dirty(path="git") is True

        with open(osp.join(rwrepo.working_dir, "doc", "no-such-file.txt"), "wt") as f:
            f.write("junk")
        assert rwrepo.is_dirty(path="doc") is False
        assert rwrepo.is_dirty(untracked_files=True, path="doc") is True

    def test_head(self):
        self.assertEqual(self.rorepo.head.reference.object, self.rorepo.active_branch.object)

    def test_index(self):
        index = self.rorepo.index
        self.assertIsInstance(index, IndexFile)

    def test_tag(self):
        assert self.rorepo.tag("refs/tags/0.1.5").commit

    def test_tag_to_full_tag_path(self):
        tags = ["0.1.5", "tags/0.1.5", "refs/tags/0.1.5"]
        value_errors = []
        for tag in tags:
            try:
                self.rorepo.tag(tag)
            except ValueError as valueError:
                value_errors.append(valueError.args[0])
        self.assertEqual(value_errors, [])

    def test_archive(self):
        tmpfile = tempfile.mktemp(suffix="archive-test")
        with open(tmpfile, "wb") as stream:
            self.rorepo.archive(stream, "0.1.6", path="doc")
            assert stream.tell()
        os.remove(tmpfile)

    @mock.patch.object(Git, "_call_process")
    def test_should_display_blame_information(self, git):
        git.return_value = fixture("blame")
        b = self.rorepo.blame("master", "lib/git.py")
        self.assertEqual(13, len(b))
        self.assertEqual(2, len(b[0]))
        # self.assertEqual(25, reduce(lambda acc, x: acc + len(x[-1]), b))
        self.assertEqual(hash(b[0][0]), hash(b[9][0]))
        c = b[0][0]
        self.assertTrue(git.called)

        self.assertEqual("634396b2f541a9f2d58b00be1a07f0c358b999b3", c.hexsha)
        self.assertEqual("Tom Preston-Werner", c.author.name)
        self.assertEqual("tom@mojombo.com", c.author.email)
        self.assertEqual(1191997100, c.authored_date)
        self.assertEqual("Tom Preston-Werner", c.committer.name)
        self.assertEqual("tom@mojombo.com", c.committer.email)
        self.assertEqual(1191997100, c.committed_date)
        self.assertRaisesRegex(
            ValueError,
            "634396b2f541a9f2d58b00be1a07f0c358b999b3 missing",
            lambda: c.message,
        )

        # test the 'lines per commit' entries
        tlist = b[0][1]
        self.assertTrue(tlist)
        self.assertTrue(isinstance(tlist[0], str))
        self.assertTrue(len(tlist) < sum(len(t) for t in tlist))  # test for single-char bug

        # BINARY BLAME
        git.return_value = fixture("blame_binary")
        blames = self.rorepo.blame("master", "rps")
        self.assertEqual(len(blames), 2)

    def test_blame_real(self):
        c = 0
        nml = 0  # amount of multi-lines per blame
        for item in self.rorepo.head.commit.tree.traverse(
            predicate=lambda i, d: i.type == "blob" and i.path.endswith(".py")
        ):
            c += 1

            for b in self.rorepo.blame(self.rorepo.head, item.path):
                nml += int(len(b[1]) > 1)
        # END for each item to traverse
        assert c, "Should have executed at least one blame command"
        assert nml, "There should at least be one blame commit that contains multiple lines"

    @mock.patch.object(Git, "_call_process")
    def test_blame_incremental(self, git):
        # loop over two fixtures, create a test fixture for 2.11.1+ syntax
        for git_fixture in ("blame_incremental", "blame_incremental_2.11.1_plus"):
            git.return_value = fixture(git_fixture)
            blame_output = self.rorepo.blame_incremental("9debf6b0aafb6f7781ea9d1383c86939a1aacde3", "AUTHORS")
            blame_output = list(blame_output)
            self.assertEqual(len(blame_output), 5)

            # Check all outputted line numbers
            ranges = flatten([entry.linenos for entry in blame_output])
            self.assertEqual(
                ranges,
                flatten(
                    [
                        range(2, 3),
                        range(14, 15),
                        range(1, 2),
                        range(3, 14),
                        range(15, 17),
                    ]
                ),
            )

            commits = [entry.commit.hexsha[:7] for entry in blame_output]
            self.assertEqual(commits, ["82b8902", "82b8902", "c76852d", "c76852d", "c76852d"])

            # Original filenames
            self.assertSequenceEqual(
                [entry.orig_path for entry in blame_output],
                ["AUTHORS"] * len(blame_output),
            )

            # Original line numbers
            orig_ranges = flatten([entry.orig_linenos for entry in blame_output])
            self.assertEqual(
                orig_ranges,
                flatten(
                    [
                        range(2, 3),
                        range(14, 15),
                        range(1, 2),
                        range(2, 13),
                        range(13, 15),
                    ]
                ),
            )  # noqa E501

    @mock.patch.object(Git, "_call_process")
    def test_blame_complex_revision(self, git):
        git.return_value = fixture("blame_complex_revision")
        res = self.rorepo.blame("HEAD~10..HEAD", "README.md")
        self.assertEqual(len(res), 1)
        self.assertEqual(len(res[0][1]), 83, "Unexpected amount of parsed blame lines")

    @mock.patch.object(Git, "_call_process")
    def test_blame_accepts_rev_opts(self, git):
        res = self.rorepo.blame("HEAD", "README.md", rev_opts=["-M", "-C", "-C"])
        expected_args = ['blame', 'HEAD', '-M', '-C', '-C', '--', 'README.md']
        boilerplate_kwargs = {"p" : True, "stdout_as_string": False}
        git.assert_called_once_with(*expected_args, **boilerplate_kwargs)

    @skipIf(
        HIDE_WINDOWS_KNOWN_ERRORS and Git.is_cygwin(),
        """FIXME: File "C:\\projects\\gitpython\\git\\cmd.py", line 671, in execute
                    raise GitCommandError(command, status, stderr_value, stdout_value)
                GitCommandError: Cmd('git') failed due to: exit code(128)
                  cmdline: git add 1__��ava verb��ten 1_test _myfile 1_test_other_file
                          1_��ava-----verb��ten
                  stderr: 'fatal: pathspec '"1__çava verböten"' did not match any files'
                """,
    )
    @with_rw_repo("HEAD", bare=False)
    def test_untracked_files(self, rwrepo):
        for run, repo_add in enumerate((rwrepo.index.add, rwrepo.git.add)):
            base = rwrepo.working_tree_dir
            files = (
                join_path_native(base, "%i_test _myfile" % run),
                join_path_native(base, "%i_test_other_file" % run),
                join_path_native(base, "%i__çava verböten" % run),
                join_path_native(base, "%i_çava-----verböten" % run),
            )

            num_recently_untracked = 0
            for fpath in files:
                with open(fpath, "wb"):
                    pass
            untracked_files = rwrepo.untracked_files
            num_recently_untracked = len(untracked_files)

            # assure we have all names - they are relative to the git-dir
            num_test_untracked = 0
            for utfile in untracked_files:
                num_test_untracked += join_path_native(base, utfile) in files
            self.assertEqual(len(files), num_test_untracked)

            repo_add(untracked_files)
            self.assertEqual(len(rwrepo.untracked_files), (num_recently_untracked - len(files)))
        # end for each run

    def test_config_reader(self):
        reader = self.rorepo.config_reader()  # all config files
        assert reader.read_only
        reader = self.rorepo.config_reader("repository")  # single config file
        assert reader.read_only

    def test_config_writer(self):
        for config_level in self.rorepo.config_level:
            try:
                with self.rorepo.config_writer(config_level) as writer:
                    self.assertFalse(writer.read_only)
            except IOError:
                # its okay not to get a writer for some configuration files if we
                # have no permissions
                pass

    def test_config_level_paths(self):
        for config_level in self.rorepo.config_level:
            assert self.rorepo._get_config_path(config_level)

    def test_creation_deletion(self):
        # just a very quick test to assure it generally works. There are
        # specialized cases in the test_refs module
        head = self.rorepo.create_head("new_head", "HEAD~1")
        self.rorepo.delete_head(head)

        try:
            tag = self.rorepo.create_tag("new_tag", "HEAD~2")
        finally:
            self.rorepo.delete_tag(tag)
        with self.rorepo.config_writer():
            pass
        try:
            remote = self.rorepo.create_remote("new_remote", "git@server:repo.git")
        finally:
            self.rorepo.delete_remote(remote)

    def test_comparison_and_hash(self):
        # this is only a preliminary test, more testing done in test_index
        self.assertEqual(self.rorepo, self.rorepo)
        self.assertFalse(self.rorepo != self.rorepo)
        self.assertEqual(len({self.rorepo, self.rorepo}), 1)

    @with_rw_directory
    def test_tilde_and_env_vars_in_repo_path(self, rw_dir):
        ph = os.environ.get("HOME")
        try:
            os.environ["HOME"] = rw_dir
            Repo.init(osp.join("~", "test.git"), bare=True)

            os.environ["FOO"] = rw_dir
            Repo.init(osp.join("$FOO", "test.git"), bare=True)
        finally:
            if ph:
                os.environ["HOME"] = ph
                del os.environ["FOO"]
        # end assure HOME gets reset to what it was

    def test_git_cmd(self):
        # test CatFileContentStream, just to be very sure we have no fencepost errors
        # last \n is the terminating newline that it expects
        l1 = b"0123456789\n"
        l2 = b"abcdefghijklmnopqrstxy\n"
        l3 = b"z\n"
        d = l1 + l2 + l3 + b"\n"

        l1p = l1[:5]

        # full size
        # size is without terminating newline
        def mkfull():
            return Git.CatFileContentStream(len(d) - 1, BytesIO(d))

        ts = 5

        def mktiny():
            return Git.CatFileContentStream(ts, BytesIO(d))

        # readlines no limit
        s = mkfull()
        lines = s.readlines()
        self.assertEqual(len(lines), 3)
        self.assertTrue(lines[-1].endswith(b"\n"), lines[-1])
        self.assertEqual(s._stream.tell(), len(d))  # must have scrubbed to the end

        # realines line limit
        s = mkfull()
        lines = s.readlines(5)
        self.assertEqual(len(lines), 1)

        # readlines on tiny sections
        s = mktiny()
        lines = s.readlines()
        self.assertEqual(len(lines), 1)
        self.assertEqual(lines[0], l1p)
        self.assertEqual(s._stream.tell(), ts + 1)

        # readline no limit
        s = mkfull()
        self.assertEqual(s.readline(), l1)
        self.assertEqual(s.readline(), l2)
        self.assertEqual(s.readline(), l3)
        self.assertEqual(s.readline(), b"")
        self.assertEqual(s._stream.tell(), len(d))

        # readline limit
        s = mkfull()
        self.assertEqual(s.readline(5), l1p)
        self.assertEqual(s.readline(), l1[5:])

        # readline on tiny section
        s = mktiny()
        self.assertEqual(s.readline(), l1p)
        self.assertEqual(s.readline(), b"")
        self.assertEqual(s._stream.tell(), ts + 1)

        # read no limit
        s = mkfull()
        self.assertEqual(s.read(), d[:-1])
        self.assertEqual(s.read(), b"")
        self.assertEqual(s._stream.tell(), len(d))

        # read limit
        s = mkfull()
        self.assertEqual(s.read(5), l1p)
        self.assertEqual(s.read(6), l1[5:])
        self.assertEqual(s._stream.tell(), 5 + 6)  # its not yet done

        # read tiny
        s = mktiny()
        self.assertEqual(s.read(2), l1[:2])
        self.assertEqual(s._stream.tell(), 2)
        self.assertEqual(s.read(), l1[2:ts])
        self.assertEqual(s._stream.tell(), ts + 1)

    def _assert_rev_parse_types(self, name, rev_obj):
        rev_parse = self.rorepo.rev_parse

        if rev_obj.type == "tag":
            rev_obj = rev_obj.object

        # tree and blob type
        obj = rev_parse(name + "^{tree}")
        self.assertEqual(obj, rev_obj.tree)

        obj = rev_parse(name + ":CHANGES")
        self.assertEqual(obj.type, "blob")
        self.assertEqual(obj.path, "CHANGES")
        self.assertEqual(rev_obj.tree["CHANGES"], obj)

    def _assert_rev_parse(self, name):
        """tries multiple different rev-parse syntaxes with the given name
        :return: parsed object"""
        rev_parse = self.rorepo.rev_parse
        orig_obj = rev_parse(name)
        if orig_obj.type == "tag":
            obj = orig_obj.object
        else:
            obj = orig_obj
        # END deref tags by default

        # try history
        rev = name + "~"
        obj2 = rev_parse(rev)
        self.assertEqual(obj2, obj.parents[0])
        self._assert_rev_parse_types(rev, obj2)

        # history with number
        ni = 11
        history = [obj.parents[0]]
        for pn in range(ni):
            history.append(history[-1].parents[0])
        # END get given amount of commits

        for pn in range(11):
            rev = name + "~%i" % (pn + 1)
            obj2 = rev_parse(rev)
            self.assertEqual(obj2, history[pn])
            self._assert_rev_parse_types(rev, obj2)
        # END history check

        # parent ( default )
        rev = name + "^"
        obj2 = rev_parse(rev)
        self.assertEqual(obj2, obj.parents[0])
        self._assert_rev_parse_types(rev, obj2)

        # parent with number
        for pn, parent in enumerate(obj.parents):
            rev = name + "^%i" % (pn + 1)
            self.assertEqual(rev_parse(rev), parent)
            self._assert_rev_parse_types(rev, parent)
        # END for each parent

        return orig_obj

    @with_rw_repo("HEAD", bare=False)
    def test_rw_rev_parse(self, rwrepo):
        # verify it does not confuse branches with hexsha ids
        ahead = rwrepo.create_head("aaaaaaaa")
        assert rwrepo.rev_parse(str(ahead)) == ahead.commit

    def test_rev_parse(self):
        rev_parse = self.rorepo.rev_parse

        # try special case: This one failed at some point, make sure its fixed
        self.assertEqual(rev_parse("33ebe").hexsha, "33ebe7acec14b25c5f84f35a664803fcab2f7781")

        # start from reference
        num_resolved = 0

        for ref_no, ref in enumerate(Reference.iter_items(self.rorepo)):
            path_tokens = ref.path.split("/")
            for pt in range(len(path_tokens)):
                path_section = "/".join(path_tokens[-(pt + 1) :])
                try:
                    obj = self._assert_rev_parse(path_section)
                    self.assertEqual(obj.type, ref.object.type)
                    num_resolved += 1
                except (BadName, BadObject):
                    print("failed on %s" % path_section)
                    # is fine, in case we have something like 112, which belongs to remotes/rname/merge-requests/112
                # END exception handling
            # END for each token
            if ref_no == 3 - 1:
                break
        # END for each reference
        assert num_resolved

        # it works with tags !
        tag = self._assert_rev_parse("0.1.4")
        self.assertEqual(tag.type, "tag")

        # try full sha directly ( including type conversion )
        self.assertEqual(tag.object, rev_parse(tag.object.hexsha))
        self._assert_rev_parse_types(tag.object.hexsha, tag.object)

        # multiple tree types result in the same tree: HEAD^{tree}^{tree}:CHANGES
        rev = "0.1.4^{tree}^{tree}"
        self.assertEqual(rev_parse(rev), tag.object.tree)
        self.assertEqual(rev_parse(rev + ":CHANGES"), tag.object.tree["CHANGES"])

        # try to get parents from first revision - it should fail as no such revision
        # exists
        first_rev = "33ebe7acec14b25c5f84f35a664803fcab2f7781"
        commit = rev_parse(first_rev)
        self.assertEqual(len(commit.parents), 0)
        self.assertEqual(commit.hexsha, first_rev)
        self.assertRaises(BadName, rev_parse, first_rev + "~")
        self.assertRaises(BadName, rev_parse, first_rev + "^")

        # short SHA1
        commit2 = rev_parse(first_rev[:20])
        self.assertEqual(commit2, commit)
        commit2 = rev_parse(first_rev[:5])
        self.assertEqual(commit2, commit)

        # todo: dereference tag into a blob 0.1.7^{blob} - quite a special one
        # needs a tag which points to a blob

        # ref^0 returns commit being pointed to, same with ref~0, and ^{}
        tag = rev_parse("0.1.4")
        for token in ("~0", "^0", "^{}"):
            self.assertEqual(tag.object, rev_parse("0.1.4%s" % token))
        # END handle multiple tokens

        # try partial parsing
        max_items = 40
        for i, binsha in enumerate(self.rorepo.odb.sha_iter()):
            self.assertEqual(
                rev_parse(bin_to_hex(binsha)[: 8 - (i % 2)].decode("ascii")).binsha,
                binsha,
            )
            if i > max_items:
                # this is rather slow currently, as rev_parse returns an object
                # which requires accessing packs, it has some additional overhead
                break
        # END for each binsha in repo

        # missing closing brace commit^{tree
        self.assertRaises(ValueError, rev_parse, "0.1.4^{tree")

        # missing starting brace
        self.assertRaises(ValueError, rev_parse, "0.1.4^tree}")

        # REVLOG
        #######
        head = self.rorepo.head

        # need to specify a ref when using the @ syntax
        self.assertRaises(BadObject, rev_parse, "%s@{0}" % head.commit.hexsha)

        # uses HEAD.ref by default
        self.assertEqual(rev_parse("@{0}"), head.commit)
        if not head.is_detached:
            refspec = "%s@{0}" % head.ref.name
            self.assertEqual(rev_parse(refspec), head.ref.commit)
            # all additional specs work as well
            self.assertEqual(rev_parse(refspec + "^{tree}"), head.commit.tree)
            self.assertEqual(rev_parse(refspec + ":CHANGES").type, "blob")
        # END operate on non-detached head

        # position doesn't exist
        self.assertRaises(IndexError, rev_parse, "@{10000}")

        # currently, nothing more is supported
        self.assertRaises(NotImplementedError, rev_parse, "@{1 week ago}")

        # the last position
        assert rev_parse("@{1}") != head.commit

    def test_repo_odbtype(self):
        target_type = GitCmdObjectDB
        self.assertIsInstance(self.rorepo.odb, target_type)

    @pytest.mark.xfail(
        sys.platform == "cygwin",
        reason="Cygwin GitPython can't find submodule SHA",
        raises=ValueError
    )
    def test_submodules(self):
        self.assertEqual(len(self.rorepo.submodules), 1)  # non-recursive
        self.assertGreaterEqual(len(list(self.rorepo.iter_submodules())), 2)

        self.assertIsInstance(self.rorepo.submodule("gitdb"), Submodule)
        self.assertRaises(ValueError, self.rorepo.submodule, "doesn't exist")

    @with_rw_repo("HEAD", bare=False)
    def test_submodule_update(self, rwrepo):
        # fails in bare mode
        rwrepo._bare = True
        self.assertRaises(InvalidGitRepositoryError, rwrepo.submodule_update)
        rwrepo._bare = False

        # test create submodule
        sm = rwrepo.submodules[0]
        sm = rwrepo.create_submodule(
            "my_new_sub",
            "some_path",
            join_path_native(self.rorepo.working_tree_dir, sm.path),
        )
        self.assertIsInstance(sm, Submodule)

        # note: the rest of this functionality is tested in test_submodule

    @with_rw_repo("HEAD")
    def test_git_file(self, rwrepo):
        # Move the .git directory to another location and create the .git file.
        real_path_abs = osp.abspath(join_path_native(rwrepo.working_tree_dir, ".real"))
        os.rename(rwrepo.git_dir, real_path_abs)
        git_file_path = join_path_native(rwrepo.working_tree_dir, ".git")
        with open(git_file_path, "wb") as fp:
            fp.write(fixture("git_file"))

        # Create a repo and make sure it's pointing to the relocated .git directory.
        git_file_repo = Repo(rwrepo.working_tree_dir)
        self.assertEqual(osp.abspath(git_file_repo.git_dir), real_path_abs)

        # Test using an absolute gitdir path in the .git file.
        with open(git_file_path, "wb") as fp:
            fp.write(("gitdir: %s\n" % real_path_abs).encode("ascii"))
        git_file_repo = Repo(rwrepo.working_tree_dir)
        self.assertEqual(osp.abspath(git_file_repo.git_dir), real_path_abs)

    def test_file_handle_leaks(self):
        def last_commit(repo, rev, path):
            commit = next(repo.iter_commits(rev, path, max_count=1))
            commit.tree[path]

        # This is based on this comment
        # https://github.com/gitpython-developers/GitPython/issues/60#issuecomment-23558741
        # And we expect to set max handles to a low value, like 64
        # You should set ulimit -n X, see .travis.yml
        # The loops below would easily create 500 handles if these would leak (4 pipes + multiple mapped files)
        for _ in range(64):
            for repo_type in (GitCmdObjectDB, GitDB):
                repo = Repo(self.rorepo.working_tree_dir, odbt=repo_type)
                last_commit(repo, "master", "test/test_base.py")
            # end for each repository type
        # end for each iteration

    def test_remote_method(self):
        self.assertRaises(ValueError, self.rorepo.remote, "foo-blue")
        self.assertIsInstance(self.rorepo.remote(name="origin"), Remote)

    @with_rw_directory
    def test_empty_repo(self, rw_dir):
        """Assure we can handle empty repositories"""
        r = Repo.init(rw_dir, mkdir=False)
        # It's ok not to be able to iterate a commit, as there is none
        self.assertRaises(ValueError, r.iter_commits)
        self.assertEqual(r.active_branch.name, "master")
        assert not r.active_branch.is_valid(), "Branch is yet to be born"

        # actually, when trying to create a new branch without a commit, git itself fails
        # We should, however, not fail ungracefully
        self.assertRaises(BadName, r.create_head, "foo")
        self.assertRaises(BadName, r.create_head, "master")
        # It's expected to not be able to access a tree
        self.assertRaises(ValueError, r.tree)

        new_file_path = osp.join(rw_dir, "new_file.ext")
        touch(new_file_path)
        r.index.add([new_file_path])
        r.index.commit("initial commit\nBAD MESSAGE 1\n")

        # Now a branch should be creatable
        nb = r.create_head("foo")
        assert nb.is_valid()

        with open(new_file_path, "w") as f:
            f.write("Line 1\n")

        r.index.add([new_file_path])
        r.index.commit("add line 1\nBAD MESSAGE 2\n")

        with open("%s/.git/logs/refs/heads/master" % (rw_dir,), "r") as f:
            contents = f.read()

        assert "BAD MESSAGE" not in contents, "log is corrupt"

    def test_merge_base(self):
        repo = self.rorepo
        c1 = "f6aa8d1"
        c2 = repo.commit("d46e3fe")
        c3 = "763ef75"
        self.assertRaises(ValueError, repo.merge_base)
        self.assertRaises(ValueError, repo.merge_base, "foo")

        # two commit merge-base
        res = repo.merge_base(c1, c2)
        self.assertIsInstance(res, list)
        self.assertEqual(len(res), 1)
        self.assertIsInstance(res[0], Commit)
        self.assertTrue(res[0].hexsha.startswith("3936084"))

        for kw in ("a", "all"):
            res = repo.merge_base(c1, c2, c3, **{kw: True})
            self.assertIsInstance(res, list)
            self.assertEqual(len(res), 1)
        # end for each keyword signalling all merge-bases to be returned

        # Test for no merge base - can't do as we have
        self.assertRaises(GitCommandError, repo.merge_base, c1, "ffffff")

    def test_is_ancestor(self):
        git = self.rorepo.git
        if git.version_info[:3] < (1, 8, 0):
            raise SkipTest("git merge-base --is-ancestor feature unsupported")

        repo = self.rorepo
        c1 = "f6aa8d1"
        c2 = "763ef75"
        self.assertTrue(repo.is_ancestor(c1, c1))
        self.assertTrue(repo.is_ancestor("master", "master"))
        self.assertTrue(repo.is_ancestor(c1, c2))
        self.assertTrue(repo.is_ancestor(c1, "master"))
        self.assertFalse(repo.is_ancestor(c2, c1))
        self.assertFalse(repo.is_ancestor("master", c1))
        for i, j in itertools.permutations([c1, "ffffff", ""], r=2):
            self.assertRaises(GitCommandError, repo.is_ancestor, i, j)

    def test_is_valid_object(self):
        repo = self.rorepo
        commit_sha = "f6aa8d1"
        blob_sha = "1fbe3e4375"
        tree_sha = "960b40fe36"
        tag_sha = "42c2f60c43"

        # Check for valid objects
        self.assertTrue(repo.is_valid_object(commit_sha))
        self.assertTrue(repo.is_valid_object(blob_sha))
        self.assertTrue(repo.is_valid_object(tree_sha))
        self.assertTrue(repo.is_valid_object(tag_sha))

        # Check for valid objects of specific type
        self.assertTrue(repo.is_valid_object(commit_sha, "commit"))
        self.assertTrue(repo.is_valid_object(blob_sha, "blob"))
        self.assertTrue(repo.is_valid_object(tree_sha, "tree"))
        self.assertTrue(repo.is_valid_object(tag_sha, "tag"))

        # Check for invalid objects
        self.assertFalse(repo.is_valid_object(b"1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a1a", "blob"))

        # Check for invalid objects of specific type
        self.assertFalse(repo.is_valid_object(commit_sha, "blob"))
        self.assertFalse(repo.is_valid_object(blob_sha, "commit"))
        self.assertFalse(repo.is_valid_object(tree_sha, "commit"))
        self.assertFalse(repo.is_valid_object(tag_sha, "commit"))

    @with_rw_directory
    def test_git_work_tree_dotgit(self, rw_dir):
        """Check that we find .git as a worktree file and find the worktree
        based on it."""
        git = Git(rw_dir)
        if git.version_info[:3] < (2, 5, 1):
            raise SkipTest("worktree feature unsupported")

        rw_master = self.rorepo.clone(join_path_native(rw_dir, "master_repo"))
        branch = rw_master.create_head("aaaaaaaa")
        worktree_path = join_path_native(rw_dir, "worktree_repo")
        if Git.is_cygwin():
            worktree_path = cygpath(worktree_path)
        rw_master.git.worktree("add", worktree_path, branch.name)

        # this ensures that we can read the repo's gitdir correctly
        repo = Repo(worktree_path)
        self.assertIsInstance(repo, Repo)

        # this ensures we're able to actually read the refs in the tree, which
        # means we can read commondir correctly.
        commit = repo.head.commit
        self.assertIsInstance(commit, Object)

        # this ensures we can read the remotes, which confirms we're reading
        # the config correctly.
        origin = repo.remotes.origin
        self.assertIsInstance(origin, Remote)

        self.assertIsInstance(repo.heads["aaaaaaaa"], Head)

    @with_rw_directory
    def test_git_work_tree_env(self, rw_dir):
        """Check that we yield to GIT_WORK_TREE"""
        # clone a repo
        # move .git directory to a subdirectory
        # set GIT_DIR and GIT_WORK_TREE appropriately
        # check that repo.working_tree_dir == rw_dir
        self.rorepo.clone(join_path_native(rw_dir, "master_repo"))

        repo_dir = join_path_native(rw_dir, "master_repo")
        old_git_dir = join_path_native(repo_dir, ".git")
        new_subdir = join_path_native(repo_dir, "gitdir")
        new_git_dir = join_path_native(new_subdir, "git")
        os.mkdir(new_subdir)
        os.rename(old_git_dir, new_git_dir)

        oldenv = os.environ.copy()
        os.environ["GIT_DIR"] = new_git_dir
        os.environ["GIT_WORK_TREE"] = repo_dir

        try:
            r = Repo()
            self.assertEqual(r.working_tree_dir, repo_dir)
            self.assertEqual(r.working_dir, repo_dir)
        finally:
            os.environ = oldenv

    @with_rw_directory
    def test_rebasing(self, rw_dir):
        r = Repo.init(rw_dir)
        fp = osp.join(rw_dir, "hello.txt")
        r.git.commit(
            "--allow-empty",
            message="init",
        )
        with open(fp, "w") as fs:
            fs.write("hello world")
        r.git.add(Git.polish_url(fp))
        r.git.commit(message="English")
        self.assertEqual(r.currently_rebasing_on(), None)
        r.git.checkout("HEAD^1")
        with open(fp, "w") as fs:
            fs.write("Hola Mundo")
        r.git.add(Git.polish_url(fp))
        r.git.commit(message="Spanish")
        commitSpanish = r.commit()
        try:
            r.git.rebase("master")
        except GitCommandError:
            pass
        self.assertEqual(r.currently_rebasing_on(), commitSpanish)

    @with_rw_directory
    def test_do_not_strip_newline_in_stdout(self, rw_dir):
        r = Repo.init(rw_dir)
        fp = osp.join(rw_dir, "hello.txt")
        with open(fp, "w") as fs:
            fs.write("hello\n")
        r.git.add(Git.polish_url(fp))
        r.git.commit(message="init")
        self.assertEqual(r.git.show("HEAD:hello.txt", strip_newline_in_stdout=False), "hello\n")