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# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
import gc
import os.path as osp
import shutil
import sys
import tempfile
import ddt
import pytest
from git import NULL_TREE, Diff, DiffIndex, Diffable, GitCommandError, Repo, Submodule
from git.cmd import Git
from git.exc import UnsafeOptionError
from test.lib import StringProcessAdapter, TestBase, fixture, with_rw_directory
def to_raw(input):
return input.replace(b"\t", b"\x00")
@ddt.ddt
class TestDiff(TestBase):
def setUp(self):
self.repo_dir = tempfile.mkdtemp()
self.submodule_dir = tempfile.mkdtemp()
def tearDown(self):
gc.collect()
shutil.rmtree(self.repo_dir)
shutil.rmtree(self.submodule_dir)
def _assert_diff_format(self, diffs):
# Verify that the format of the diff is sane.
for diff in diffs:
if diff.a_mode:
assert isinstance(diff.a_mode, int)
if diff.b_mode:
assert isinstance(diff.b_mode, int)
if diff.a_blob:
assert not diff.a_blob.path.endswith("\n")
if diff.b_blob:
assert not diff.b_blob.path.endswith("\n")
# END for each diff
return diffs
@with_rw_directory
def test_diff_with_staged_file(self, rw_dir):
# SET UP INDEX WITH MULTIPLE STAGES
r = Repo.init(rw_dir)
fp = osp.join(rw_dir, "hello.txt")
with open(fp, "w") as fs:
fs.write("hello world")
r.git.add(Git.polish_url(fp))
r.git.commit(message="init")
with open(fp, "w") as fs:
fs.write("Hola Mundo")
r.git.add(Git.polish_url(fp))
self.assertEqual(
len(r.index.diff("HEAD", create_patch=True)),
1,
"create_patch should generate patch of diff to HEAD",
)
r.git.commit(message="change on master")
self.assertEqual(
len(r.index.diff("HEAD", create_patch=True)),
0,
"create_patch should generate no patch, already on HEAD",
)
r.git.checkout("HEAD~1", b="topic")
with open(fp, "w") as fs:
fs.write("Hallo Welt")
r.git.commit(all=True, message="change on topic branch")
# There must be a merge conflict.
with self.assertRaises(GitCommandError):
r.git.cherry_pick("master")
# Now do the actual testing - this should just work.
self.assertEqual(len(r.index.diff(None)), 2)
self.assertEqual(
len(r.index.diff(None, create_patch=True)),
0,
"This should work, but doesn't right now ... it's OK",
)
@with_rw_directory
def test_patch_diff_ignores_mnemonic_prefix(self, rw_dir):
repo = Repo.init(rw_dir)
filepath = osp.join(rw_dir, "file.txt")
with open(filepath, "w") as stream:
stream.write("initial\n")
repo.index.add([filepath])
repo.index.commit("initial")
with open(filepath, "w") as stream:
stream.write("changed\n")
repo.git.config("diff.mnemonicPrefix", "true")
self.assertEqual(len(repo.head.commit.diff(None, create_patch=True)), 1)
self.assertEqual(len(repo.index.diff(None, create_patch=True)), 1)
repo.index.add([filepath])
self.assertEqual(len(repo.index.diff(NULL_TREE, create_patch=True)), 1)
self.assertEqual(repo.git.config("--get", "diff.mnemonicPrefix"), "true")
def test_list_from_string_new_mode(self):
output = StringProcessAdapter(fixture("diff_new_mode"))
diffs = Diff._index_from_patch_format(self.rorepo, output)
self._assert_diff_format(diffs)
self.assertEqual(1, len(diffs))
self.assertEqual(8, len(diffs[0].diff.splitlines()))
def test_diff_with_rename(self):
output = StringProcessAdapter(fixture("diff_rename"))
diffs = Diff._index_from_patch_format(self.rorepo, output)
self._assert_diff_format(diffs)
self.assertEqual(1, len(diffs))
diff = diffs[0]
self.assertTrue(diff.renamed_file)
self.assertTrue(diff.renamed)
self.assertEqual(diff.rename_from, "Jérôme")
self.assertEqual(diff.rename_to, "müller")
self.assertEqual(diff.raw_rename_from, b"J\xc3\xa9r\xc3\xb4me")
self.assertEqual(diff.raw_rename_to, b"m\xc3\xbcller")
assert isinstance(str(diff), str)
output = StringProcessAdapter(to_raw(fixture("diff_rename_raw")))
diffs = Diff._index_from_raw_format(self.rorepo, output)
self.assertEqual(len(diffs), 1)
diff = diffs[0]
self.assertIsNotNone(diff.renamed_file)
self.assertIsNotNone(diff.renamed)
self.assertEqual(diff.rename_from, "this")
self.assertEqual(diff.rename_to, "that")
self.assertEqual(diff.change_type, "R")
self.assertEqual(diff.score, 100)
self.assertEqual(len(list(diffs.iter_change_type("R"))), 1)
def test_diff_with_copied_file(self):
output = StringProcessAdapter(fixture("diff_copied_mode"))
diffs = Diff._index_from_patch_format(self.rorepo, output)
self._assert_diff_format(diffs)
self.assertEqual(1, len(diffs))
diff = diffs[0]
self.assertTrue(diff.copied_file)
self.assertTrue(diff.a_path, "test1.txt")
self.assertTrue(diff.b_path, "test2.txt")
assert isinstance(str(diff), str)
output = StringProcessAdapter(to_raw(fixture("diff_copied_mode_raw")))
diffs = Diff._index_from_raw_format(self.rorepo, output)
self.assertEqual(len(diffs), 1)
diff = diffs[0]
self.assertEqual(diff.change_type, "C")
self.assertEqual(diff.score, 100)
self.assertEqual(diff.a_path, "test1.txt")
self.assertEqual(diff.b_path, "test2.txt")
self.assertEqual(len(list(diffs.iter_change_type("C"))), 1)
def test_diff_with_change_in_type(self):
output = StringProcessAdapter(fixture("diff_change_in_type"))
diffs = Diff._index_from_patch_format(self.rorepo, output)
self._assert_diff_format(diffs)
self.assertEqual(2, len(diffs))
diff = diffs[0]
self.assertIsNotNone(diff.deleted_file)
self.assertEqual(diff.a_path, "this")
self.assertEqual(diff.b_path, "this")
assert isinstance(str(diff), str)
diff = diffs[1]
self.assertEqual(diff.a_path, None)
self.assertEqual(diff.b_path, "this")
self.assertIsNotNone(diff.new_file)
assert isinstance(str(diff), str)
output = StringProcessAdapter(to_raw(fixture("diff_change_in_type_raw")))
diffs = Diff._index_from_raw_format(self.rorepo, output)
self.assertEqual(len(diffs), 1)
diff = diffs[0]
self.assertEqual(diff.rename_from, None)
self.assertEqual(diff.rename_to, None)
self.assertEqual(diff.change_type, "T")
self.assertEqual(len(list(diffs.iter_change_type("T"))), 1)
def test_diff_of_modified_files_not_added_to_the_index(self):
output = StringProcessAdapter(to_raw(fixture("diff_abbrev-40_full-index_M_raw_no-color")))
diffs = Diff._index_from_raw_format(self.rorepo, output)
self.assertEqual(len(diffs), 1, "one modification")
self.assertEqual(len(list(diffs.iter_change_type("M"))), 1, "one modification")
self.assertEqual(diffs[0].change_type, "M")
self.assertIsNone(
diffs[0].b_blob,
)
@ddt.data(
(Diff._index_from_patch_format, "diff_patch_binary"),
(Diff._index_from_raw_format, "diff_raw_binary"),
)
def test_binary_diff(self, case):
method, file_name = case
res = method(None, StringProcessAdapter(fixture(file_name)))
self.assertEqual(len(res), 1)
self.assertEqual(len(list(res.iter_change_type("M"))), 1)
if res[0].diff:
self.assertEqual(
res[0].diff,
b"Binary files a/rps and b/rps differ\n",
"in patch mode, we get a diff text",
)
self.assertIsNotNone(str(res[0]), "This call should just work")
def test_diff_index(self):
output = StringProcessAdapter(fixture("diff_index_patch"))
res = Diff._index_from_patch_format(None, output)
self.assertEqual(len(res), 6)
for dr in res:
self.assertTrue(dr.diff.startswith(b"@@"), dr)
self.assertIsNotNone(str(dr), "Diff to string conversion should be possible")
# END for each diff
dr = res[3]
assert dr.diff.endswith(b"+Binary files a/rps and b/rps differ\n")
def test_diff_index_raw_format(self):
output = StringProcessAdapter(fixture("diff_index_raw"))
res = Diff._index_from_raw_format(None, output)
self.assertIsNotNone(res[0].deleted_file)
self.assertIsNone(
res[0].b_path,
)
def test_diff_file_with_colon(self):
output = fixture("diff_file_with_colon")
res = []
Diff._handle_diff_line(output, None, res)
self.assertEqual(len(res), 3)
def test_empty_diff(self):
res = []
Diff._handle_diff_line(b"", None, res)
self.assertEqual(res, [])
def test_diff_initial_commit(self):
initial_commit = self.rorepo.commit("33ebe7acec14b25c5f84f35a664803fcab2f7781")
# Without creating a patch...
diff_index = initial_commit.diff(NULL_TREE)
self.assertEqual(diff_index[0].b_path, "CHANGES")
self.assertIsNotNone(diff_index[0].new_file)
self.assertEqual(diff_index[0].diff, "")
# ...and with creating a patch.
diff_index = initial_commit.diff(NULL_TREE, create_patch=True)
self.assertIsNone(diff_index[0].a_path, repr(diff_index[0].a_path))
self.assertEqual(diff_index[0].b_path, "CHANGES", repr(diff_index[0].b_path))
self.assertIsNotNone(diff_index[0].new_file)
self.assertEqual(diff_index[0].diff, fixture("diff_initial"))
def test_diff_unsafe_paths(self):
output = StringProcessAdapter(fixture("diff_patch_unsafe_paths"))
res = Diff._index_from_patch_format(None, output)
# The "Additions"
self.assertEqual(res[0].b_path, "path/ starting with a space")
self.assertEqual(res[1].b_path, 'path/"with-quotes"')
self.assertEqual(res[2].b_path, "path/'with-single-quotes'")
self.assertEqual(res[3].b_path, "path/ending in a space ")
self.assertEqual(res[4].b_path, "path/with\ttab")
self.assertEqual(res[5].b_path, "path/with\nnewline")
self.assertEqual(res[6].b_path, "path/with spaces")
self.assertEqual(res[7].b_path, "path/with-question-mark?")
self.assertEqual(res[8].b_path, "path/¯\\_(ツ)_|¯")
self.assertEqual(res[9].b_path, "path/💩.txt")
self.assertEqual(res[9].b_rawpath, b"path/\xf0\x9f\x92\xa9.txt")
self.assertEqual(res[10].b_path, "path/�-invalid-unicode-path.txt")
self.assertEqual(res[10].b_rawpath, b"path/\x80-invalid-unicode-path.txt")
# The "Moves"
# NOTE: The path prefixes "a/" and "b/" here are legit! We're actually verifying
# that it's not "a/a/" that shows up; see the fixture data.
self.assertEqual(res[11].a_path, "a/with spaces") # NOTE: path "a/"" legit!
self.assertEqual(res[11].b_path, "b/with some spaces") # NOTE: path "b/"" legit!
self.assertEqual(res[12].a_path, "a/ending in a space ")
self.assertEqual(res[12].b_path, "b/ending with space ")
self.assertEqual(res[13].a_path, 'a/"with-quotes"')
self.assertEqual(res[13].b_path, 'b/"with even more quotes"')
def test_diff_patch_format(self):
# Test all of the 'old' format diffs for completeness - it should at least be
# able to deal with it.
fixtures = (
"diff_2",
"diff_2f",
"diff_f",
"diff_i",
"diff_mode_only",
"diff_new_mode",
"diff_numstat",
"diff_p",
"diff_rename",
"diff_tree_numstat_root",
"diff_patch_unsafe_paths",
)
for fixture_name in fixtures:
diff_proc = StringProcessAdapter(fixture(fixture_name))
Diff._index_from_patch_format(self.rorepo, diff_proc)
# END for each fixture
def test_diff_with_spaces(self):
data = StringProcessAdapter(fixture("diff_file_with_spaces"))
diff_index = Diff._index_from_patch_format(self.rorepo, data)
self.assertIsNone(diff_index[0].a_path, repr(diff_index[0].a_path))
self.assertEqual(diff_index[0].b_path, "file with spaces", repr(diff_index[0].b_path))
@pytest.mark.xfail(
sys.platform == "win32",
reason='"Access is denied" when tearDown calls shutil.rmtree',
raises=PermissionError,
)
def test_diff_submodule(self):
"""Test that diff is able to correctly diff commits that cover submodule changes"""
# Init a temp git repo that will be referenced as a submodule.
sub = Repo.init(self.submodule_dir)
with open(self.submodule_dir + "/subfile", "w") as sub_subfile:
sub_subfile.write("")
sub.index.add(["subfile"])
sub.index.commit("first commit")
# Init a temp git repo that will incorporate the submodule.
repo = Repo.init(self.repo_dir)
with open(self.repo_dir + "/test", "w") as foo_test:
foo_test.write("")
repo.index.add(["test"])
Submodule.add(repo, "subtest", "sub", url="file://" + self.submodule_dir)
repo.index.commit("first commit")
repo.create_tag("1")
# Add a commit to the submodule.
submodule = repo.submodule("subtest")
with open(self.repo_dir + "/sub/subfile", "w") as foo_sub_subfile:
foo_sub_subfile.write("blub")
submodule.module().index.add(["subfile"])
submodule.module().index.commit("changed subfile")
submodule.binsha = submodule.module().head.commit.binsha
# Commit submodule updates in parent repo.
repo.index.add([submodule])
repo.index.commit("submodule changed")
repo.create_tag("2")
diff = repo.commit("1").diff(repo.commit("2"))[0]
# If diff is unable to find the commit hashes (looks in wrong repo) the
# *_blob.size property will be a string containing exception text, an int
# indicates success.
self.assertIsInstance(diff.a_blob.size, int)
self.assertIsInstance(diff.b_blob.size, int)
def test_diff_rejects_unsafe_output_options(self):
commit = self.rorepo.head.commit
calls = (
lambda target: commit.diff(output=target),
lambda target: commit.diff(other=f"--output={target}"),
lambda target: self.rorepo.index.diff(NULL_TREE, output=target),
lambda target: self.rorepo.index.diff(f"--output={target}"),
)
for index, call in enumerate(calls):
target = osp.join(self.repo_dir, f"diff-output-{index}")
with self.assertRaises(UnsafeOptionError):
call(target)
self.assertFalse(osp.exists(target))
allowed_target = osp.join(self.repo_dir, "allowed-diff-output")
commit.diff(output=allowed_target, allow_unsafe_options=True)
self.assertTrue(osp.isfile(allowed_target))
def test_diff_interface(self):
"""Test a few variations of the main diff routine."""
assertion_map = {}
for i, commit in enumerate(self.rorepo.iter_commits("0.1.6", max_count=2)):
diff_item = commit
if i % 2 == 0:
diff_item = commit.tree
# END use tree every second item
for other in (None, NULL_TREE, commit.INDEX, commit.parents[0]):
for paths in (None, "CHANGES", ("CHANGES", "lib")):
for create_patch in range(2):
diff_index = diff_item.diff(other=other, paths=paths, create_patch=create_patch)
assert isinstance(diff_index, DiffIndex)
if diff_index:
self._assert_diff_format(diff_index)
for ct in DiffIndex.change_type:
key = "ct_%s" % ct
assertion_map.setdefault(key, 0)
assertion_map[key] = assertion_map[key] + len(list(diff_index.iter_change_type(ct)))
# END for each changetype
# Check entries.
diff_set = set()
diff_set.add(diff_index[0])
diff_set.add(diff_index[0])
self.assertEqual(len(diff_set), 1)
self.assertEqual(diff_index[0], diff_index[0])
self.assertFalse(diff_index[0] != diff_index[0])
for dr in diff_index:
self.assertIsNotNone(
str(dr),
"Diff to string conversion should be possible",
)
# END diff index checking
# END for each patch option
# END for each path option
# END for each other side
# END for each commit
# Assert that we could always find at least one instance of the members we can
# iterate in the diff index - if not this indicates its not working correctly or
# our test does not span the whole range of possibilities.
for key, value in assertion_map.items():
self.assertIsNotNone(value, "Did not find diff for %s" % key)
# END for each iteration type
# Test path not existing in the index - should be ignored.
c = self.rorepo.head.commit
cp = c.parents[0]
diff_index = c.diff(cp, ["does/not/exist"])
self.assertEqual(len(diff_index), 0)
def test_diff_interface_stability(self):
"""Test that the Diffable.Index redefinition should not break compatibility."""
self.assertIs(
Diffable.Index,
Diffable.INDEX,
"The old and new class attribute names must be aliases.",
)
self.assertIs(
type(Diffable.INDEX).__eq__,
object.__eq__,
"Equality comparison must be reference-based.",
)
@with_rw_directory
def test_rename_override(self, rw_dir):
"""Test disabling of diff rename detection."""
# Create and commit file_a.txt.
repo = Repo.init(rw_dir)
file_a = osp.join(rw_dir, "file_a.txt")
with open(file_a, "w", encoding="utf-8") as outfile:
outfile.write("hello world\n")
repo.git.add(Git.polish_url(file_a))
repo.git.commit(message="Added file_a.txt")
# Remove file_a.txt.
repo.git.rm(Git.polish_url(file_a))
# Create and commit file_b.txt with similarity index of 52.
file_b = osp.join(rw_dir, "file_b.txt")
with open(file_b, "w", encoding="utf-8") as outfile:
outfile.write("hello world\nhello world")
repo.git.add(Git.polish_url(file_b))
repo.git.commit(message="Removed file_a.txt. Added file_b.txt")
commit_a = repo.commit("HEAD")
commit_b = repo.commit("HEAD~1")
# Check default diff command with renamed files enabled.
diffs = commit_b.diff(commit_a)
self.assertEqual(1, len(diffs))
diff = diffs[0]
self.assertEqual(True, diff.renamed_file)
self.assertEqual("file_a.txt", diff.rename_from)
self.assertEqual("file_b.txt", diff.rename_to)
# Check diff with rename files disabled.
diffs = commit_b.diff(commit_a, no_renames=True)
self.assertEqual(2, len(diffs))
# Check fileA.txt deleted.
diff = diffs[0]
self.assertEqual(True, diff.deleted_file)
self.assertEqual("file_a.txt", diff.a_path)
# Check fileB.txt added.
diff = diffs[1]
self.assertEqual(True, diff.new_file)
self.assertEqual("file_b.txt", diff.a_path)
# Check diff with high similarity index.
diffs = commit_b.diff(commit_a, split_single_char_options=False, M="75%")
self.assertEqual(2, len(diffs))
# Check fileA.txt deleted.
diff = diffs[0]
self.assertEqual(True, diff.deleted_file)
self.assertEqual("file_a.txt", diff.a_path)
# Check fileB.txt added.
diff = diffs[1]
self.assertEqual(True, diff.new_file)
self.assertEqual("file_b.txt", diff.a_path)
# Check diff with low similarity index.
diffs = commit_b.diff(commit_a, split_single_char_options=False, M="40%")
self.assertEqual(1, len(diffs))
diff = diffs[0]
self.assertEqual(True, diff.renamed_file)
self.assertEqual("file_a.txt", diff.rename_from)
self.assertEqual("file_b.txt", diff.rename_to)
@with_rw_directory
def test_diff_patch_with_external_engine(self, rw_dir):
repo = Repo.init(rw_dir)
gitignore = osp.join(rw_dir, ".gitignore")
# First commit
with open(gitignore, "w") as f:
f.write("first_line\n")
repo.git.add(".gitignore")
repo.index.commit("first commit")
# Adding second line and committing
with open(gitignore, "a") as f:
f.write("second_line\n")
repo.git.add(".gitignore")
repo.index.commit("second commit")
# Adding third line and staging
with open(gitignore, "a") as f:
f.write("third_line\n")
repo.git.add(".gitignore")
# Adding fourth line
with open(gitignore, "a") as f:
f.write("fourth_line\n")
# Set the external diff engine
with repo.config_writer(config_level="repository") as writer:
writer.set_value("diff", "external", "bogus_diff_engine")
head_against_head = repo.head.commit.diff("HEAD^", create_patch=True)
self.assertEqual(len(head_against_head), 1)
head_against_index = repo.head.commit.diff(create_patch=True)
self.assertEqual(len(head_against_index), 1)
head_against_working_tree = repo.head.commit.diff(None, create_patch=True)
self.assertEqual(len(head_against_working_tree), 1)
index_against_head = repo.index.diff("HEAD", create_patch=True)
self.assertEqual(len(index_against_head), 1)
index_against_working_tree = repo.index.diff(None, create_patch=True)
self.assertEqual(len(index_against_working_tree), 1)
@with_rw_directory
def test_beginning_space(self, rw_dir):
# Create a file beginning by a whitespace
repo = Repo.init(rw_dir)
file = osp.join(rw_dir, " file.txt")
with open(file, "w") as f:
f.write("hello world")
repo.git.add(Git.polish_url(file))
repo.index.commit("first commit")
# Diff the commit with an empty tree
# and check the paths
diff_index = repo.head.commit.diff(NULL_TREE)
d = diff_index[0]
a_path = d.a_path
b_path = d.b_path
self.assertEqual(a_path, " file.txt")
self.assertEqual(b_path, " file.txt")
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