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# This module is part of GitPython and is released under the

# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/

import os.path as osp

import ddt

from git import NULL_TREE, Diff, DiffIndex, Diffable, Repo

from git.diff import decode_path

from git.exc import UnsafeOptionError

from test.lib import StringProcessAdapter, TestBase, fixture

from test.lib.fixtures import fixture_repo, read_only_fixture, writable_fixture

def to_raw(input):

return input.replace(b"\t", b"\x00")

@ddt.ddt

class TestDiff(TestBase):

def setUp(self):

temporary = writable_fixture("empty.sh")

self.addCleanup(temporary.close)

self.repo_dir = str(temporary.path())

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

def test_diff_with_staged_file(self):

with fixture_repo("diff.sh", "stages", "staged") as repo:

self.assertEqual(len(repo.index.diff("HEAD", create_patch=True)), 1)

with fixture_repo("diff.sh", "stages", "committed") as repo:

self.assertEqual(len(repo.index.diff("HEAD", create_patch=True)), 0)

with fixture_repo("diff.sh", "stages", "conflict") as repo:

self.assertEqual(len(repo.index.diff(None)), 2)

self.assertEqual(len(repo.index.diff(None, create_patch=True)), 0)

def test_patch_diff_ignores_mnemonic_prefix(self):

with fixture_repo("diff.sh", "mnemonic", "worktree") as repo:

self.assertEqual(len(repo.head.commit.diff(None, create_patch=True)), 1)

self.assertEqual(len(repo.index.diff(None, create_patch=True)), 1)

with fixture_repo("diff.sh", "mnemonic", "staged") as repo:

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.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.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_diff_raw_paths_with_colon_or_line_feed(self):

fake_meta = ":100644 100644 %s %s M" % ("1" * 40, "2" * 40)

paths = [":planted", "docs/a\n" + fake_meta, "docs/b", "setup.py"]

with fixture_repo("diff.sh", "raw-paths") as repo:

expected = (

repo.git.diff_tree(

"--root",

"-r",

"--no-commit-id",

"--name-status",

"-z",

"HEAD",

"--",

stdout_as_string=False,

)

.rstrip(b"\0")

.split(b"\0")

)

self.assertEqual(expected[::2], [b"A"] * len(paths))

self.assertEqual(expected[1::2], [path.encode() for path in sorted(paths)])

diffs = repo.head.commit.diff(NULL_TREE)

self.assertEqual([d.b_path for d in diffs], sorted(paths))

self.assertEqual({d.change_type for d in diffs}, {"A"})

@ddt.data(

(b"a/x b/x", b"x"),

(b"a/x b/x ", b"x "),

(b"a/x b/y", None),

(b"a/x b/xx", None),

(b"a/x-b/x", None),

(b"", None),

(b'"a/x\\t" "b/x\\t"', b"x\t"),

(b'"a/x\\t" "b/x\\011"', b"x\t"),

(b'"a/x\\t" "b/y\\t"', None),

(b'"a/x\\t" "b/x\\t', None),

)

def test_same_path_in_header(self, case):

names, expected = case

self.assertEqual(Diff._same_path_in_header(names), expected)

def test_same_path_in_header_copies_linear_bytes(self):

class SliceCountingBytes(bytes):

sliced_bytes = 0

def __getitem__(self, key):

result = super().__getitem__(key)

if isinstance(key, slice):

self.sliced_bytes += len(result)

return result

path = b"x " * 1000

names = SliceCountingBytes(b"a/" + path + b" b/" + path)

self.assertEqual(Diff._same_path_in_header(names), path)

# Count copied bytes rather than asserting a machine-dependent time limit.

self.assertLessEqual(names.sliced_bytes, 2 * len(names))

def test_diff_patch_paths_named_only_by_the_header_line(self):

paths = ["assets b/logo.png", "docs a/empty", "quoted\t a/tab"]

with fixture_repo("diff.sh", "patch-paths") as repo:

commit = repo.commit("initial")

expected = repo.git.diff_tree(

"--root", "-r", "--no-commit-id", "--name-status", "-z", commit, stdout_as_string=False

).split(b"\0")

self.assertEqual(expected, [part for path in paths for part in (b"A", path.encode())] + [b""])

diffs = commit.diff(NULL_TREE, create_patch=True)

self.assertEqual({(d.a_path, d.b_path) for d in diffs}, {(path, path) for path in paths})

expected = repo.git.diff_tree(

"-r",

"-C",

"--find-copies-harder",

"--name-status",

"-z",

commit,

repo.head.commit,

stdout_as_string=False,

).split(b"\0")

self.assertEqual(expected, [b"M", paths[0].encode(), b"C100", paths[0].encode(), b"copy b/logo.png", b""])

diffs = commit.diff(repo.head.commit, create_patch=True, C=True, find_copies_harder=True)

self.assertEqual(

{(d.a_path, d.b_path, d.copied_file) for d in diffs},

{(paths[0], paths[0], False), (paths[0], "copy b/logo.png", True)},

)

def test_diff_patch_mode_only_with_long_space_heavy_path(self):

path = b"x " * 250000

with fixture_repo("diff.sh", "patch-long-path") as repo:

before, after = repo.tree("mode-100644"), repo.tree("mode-100755")

expected = repo.git.diff_tree("--raw", "-z", before, after, stdout_as_string=False).split(b"\0")

self.assertTrue(expected[0].startswith(b":100644 100755 "))

self.assertTrue(expected[0].endswith(b" M"))

self.assertEqual(expected[1:], [path, b""])

diffs = before.diff(after, create_patch=True)

self.assertEqual(len(diffs), 1)

self.assertEqual((diffs[0].a_rawpath, diffs[0].b_rawpath), (path, path))

self.assertEqual((diffs[0].a_mode, diffs[0].b_mode), (0o100644, 0o100755))

self.assertEqual(diffs[0].diff, b"")

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_decode_path_distinguishes_escaped_backslashes_from_octal_bytes(self):

self.assertEqual(decode_path(b'"foo\\\\899bar"', False), b"foo\\899bar")

self.assertEqual(decode_path(b'"foo\\\\123bar"', False), b"foo\\123bar")

self.assertEqual(decode_path(b'"foo\\123bar"', False), b"fooSbar")

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))

def test_diff_submodule(self):

fixture = read_only_fixture("diff.sh", "submodule")

with Repo(fixture / "repo") as repo, Repo(fixture / "repo/sub") as sub:

first_commit = sub.commit("HEAD~1")

changed_commit = sub.head.commit

diff = repo.commit("1").diff(repo.commit("2"))[0]

for item, commit in ((diff.a_blob, first_commit), (diff.b_blob, changed_commit)):

self.assertEqual(item.size, commit.size)

self.assertEqual(item.data_stream.read(), commit.data_stream.read())

def test_diff_rejects_unsafe_output_options(self):

commit = self.rorepo.head.commit

commit.diff(S="needle")

calls = (

lambda target: commit.diff(output=target),

lambda target: commit.diff(other=f"--output={target}"),

lambda target: commit.diff(O=target),

lambda target: commit.diff(orderfile=target),

lambda target: commit.diff(other=f"--orderfile={target}"),

lambda target: commit.diff(other=f"-pO{target}"),

lambda target: commit.diff(other=f"-uO{target}"),

lambda target: commit.diff(other=f"-DO{target}"),

lambda target: self.rorepo.index.diff(NULL_TREE, output=target),

lambda target: self.rorepo.index.diff(f"--output={target}"),

lambda target: self.rorepo.index.diff(NULL_TREE, O=target),

lambda target: self.rorepo.index.diff(NULL_TREE, orderfile=target),

lambda target: self.rorepo.index.diff(f"--orderfile={target}"),

lambda target: self.rorepo.index.diff(f"-pO{target}"),

lambda target: self.rorepo.index.diff(f"-uO{target}"),

lambda target: self.rorepo.index.diff(f"-DO{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_rejects_no_index(self):

calls = (

lambda: self.rorepo.head.commit.diff(no_index=True),

lambda: self.rorepo.head.commit.diff(other="--no-index"),

lambda: self.rorepo.index.diff(None, no_index=True),

lambda: self.rorepo.index.diff("--no-index"),

)

for call in calls:

with self.assertRaises(UnsafeOptionError):

call()

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])

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.",

)

def test_rename_override(self):

with fixture_repo("diff.sh", "rename") as repo:

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)

def test_diff_patch_with_external_engine(self):

with fixture_repo("diff.sh", "external") as repo:

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)

def test_beginning_space(self):

with fixture_repo("diff.sh", "space") as repo:

# 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")

GitPython/test/test_diff.py at main · gitpython-developers/GitPython · GitHub

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