path: root/t/t6042-merge-rename-corner-cases.sh

#!/bin/sh

test_description="recursive merge corner cases w/ renames but not criss-crosses"
# t6036 has corner cases that involve both criss-cross merges and renames

. ./test-lib.sh

test_expect_success 'setup rename/delete + untracked file' '
	test_create_repo rename-delete-untracked &&
	(
		cd rename-delete-untracked &&

		echo "A pretty inscription" >ring &&
		git add ring &&
		test_tick &&
		git commit -m beginning &&

		git branch people &&
		git checkout -b rename-the-ring &&
		git mv ring one-ring-to-rule-them-all &&
		test_tick &&
		git commit -m fullname &&

		git checkout people &&
		git rm ring &&
		echo gollum >owner &&
		git add owner &&
		test_tick &&
		git commit -m track-people-instead-of-objects &&
		echo "Myyy PRECIOUSSS" >ring
	)
'

test_expect_success "Does git preserve Gollum's precious artifact?" '
	(
		cd rename-delete-untracked &&

		test_must_fail git merge -s recursive rename-the-ring &&

		# Make sure git did not delete an untracked file
		test -f ring
	)
'

# Testcase setup for rename/modify/add-source:
#   Commit A: new file: a
#   Commit B: modify a slightly
#   Commit C: rename a->b, add completely different a
#
# We should be able to merge B & C cleanly

test_expect_success 'setup rename/modify/add-source conflict' '
	test_create_repo rename-modify-add-source &&
	(
		cd rename-modify-add-source &&

		printf "1\n2\n3\n4\n5\n6\n7\n" >a &&
		git add a &&
		git commit -m A &&
		git tag A &&

		git checkout -b B A &&
		echo 8 >>a &&
		git add a &&
		git commit -m B &&

		git checkout -b C A &&
		git mv a b &&
		echo something completely different >a &&
		git add a &&
		git commit -m C
	)
'

test_expect_failure 'rename/modify/add-source conflict resolvable' '
	(
		cd rename-modify-add-source &&

		git checkout B^0 &&

		git merge -s recursive C^0 &&

		test $(git rev-parse B:a) = $(git rev-parse b) &&
		test $(git rev-parse C:a) = $(git rev-parse a)
	)
'

test_expect_success 'setup resolvable conflict missed if rename missed' '
	test_create_repo break-detection-1 &&
	(
		cd break-detection-1 &&

		printf "1\n2\n3\n4\n5\n" >a &&
		echo foo >b &&
		git add a b &&
		git commit -m A &&
		git tag A &&

		git checkout -b B A &&
		git mv a c &&
		echo "Completely different content" >a &&
		git add a &&
		git commit -m B &&

		git checkout -b C A &&
		echo 6 >>a &&
		git add a &&
		git commit -m C
	)
'

test_expect_failure 'conflict caused if rename not detected' '
	(
		cd break-detection-1 &&

		git checkout -q C^0 &&
		git merge -s recursive B^0 &&

		test 3 -eq $(git ls-files -s | wc -l) &&
		test 0 -eq $(git ls-files -u | wc -l) &&
		test 0 -eq $(git ls-files -o | wc -l) &&

		test_line_count = 6 c &&
		test $(git rev-parse HEAD:a) = $(git rev-parse B:a) &&
		test $(git rev-parse HEAD:b) = $(git rev-parse A:b)
	)
'

test_expect_success 'setup conflict resolved wrong if rename missed' '
	test_create_repo break-detection-2 &&
	(
		cd break-detection-2 &&

		printf "1\n2\n3\n4\n5\n" >a &&
		echo foo >b &&
		git add a b &&
		git commit -m A &&
		git tag A &&

		git checkout -b D A &&
		echo 7 >>a &&
		git add a &&
		git mv a c &&
		echo "Completely different content" >a &&
		git add a &&
		git commit -m D &&

		git checkout -b E A &&
		git rm a &&
		echo "Completely different content" >>a &&
		git add a &&
		git commit -m E
	)
'

test_expect_failure 'missed conflict if rename not detected' '
	(
		cd break-detection-2 &&

		git checkout -q E^0 &&
		test_must_fail git merge -s recursive D^0
	)
'

# Tests for undetected rename/add-source causing a file to erroneously be
# deleted (and for mishandled rename/rename(1to1) causing the same issue).
#
# This test uses a rename/rename(1to1)+add-source conflict (1to1 means the
# same file is renamed on both sides to the same thing; it should trigger
# the 1to2 logic, which it would do if the add-source didn't cause issues
# for git's rename detection):
#   Commit A: new file: a
#   Commit B: rename a->b
#   Commit C: rename a->b, add unrelated a

test_expect_success 'setup undetected rename/add-source causes data loss' '
	test_create_repo break-detection-3 &&
	(
		cd break-detection-3 &&

		printf "1\n2\n3\n4\n5\n" >a &&
		git add a &&
		git commit -m A &&
		git tag A &&

		git checkout -b B A &&
		git mv a b &&
		git commit -m B &&

		git checkout -b C A &&
		git mv a b &&
		echo foobar >a &&
		git add a &&
		git commit -m C
	)
'

test_expect_failure 'detect rename/add-source and preserve all data' '
	(
		cd break-detection-3 &&

		git checkout B^0 &&

		git merge -s recursive C^0 &&

		test 2 -eq $(git ls-files -s | wc -l) &&
		test 2 -eq $(git ls-files -u | wc -l) &&
		test 0 -eq $(git ls-files -o | wc -l) &&

		test -f a &&
		test -f b &&

		test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
		test $(git rev-parse HEAD:a) = $(git rev-parse C:a)
	)
'

test_expect_failure 'detect rename/add-source and preserve all data, merge other way' '
	(
		cd break-detection-3 &&

		git checkout C^0 &&

		git merge -s recursive B^0 &&

		test 2 -eq $(git ls-files -s | wc -l) &&
		test 2 -eq $(git ls-files -u | wc -l) &&
		test 0 -eq $(git ls-files -o | wc -l) &&

		test -f a &&
		test -f b &&

		test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
		test $(git rev-parse HEAD:a) = $(git rev-parse C:a)
	)
'

test_expect_success 'setup content merge + rename/directory conflict' '
	test_create_repo rename-directory-1 &&
	(
		cd rename-directory-1 &&

		printf "1\n2\n3\n4\n5\n6\n" >file &&
		git add file &&
		test_tick &&
		git commit -m base &&
		git tag base &&

		git checkout -b right &&
		echo 7 >>file &&
		mkdir newfile &&
		echo junk >newfile/realfile &&
		git add file newfile/realfile &&
		test_tick &&
		git commit -m right &&

		git checkout -b left-conflict base &&
		echo 8 >>file &&
		git add file &&
		git mv file newfile &&
		test_tick &&
		git commit -m left &&

		git checkout -b left-clean base &&
		echo 0 >newfile &&
		cat file >>newfile &&
		git add newfile &&
		git rm file &&
		test_tick &&
		git commit -m left
	)
'

test_expect_success 'rename/directory conflict + clean content merge' '
	(
		cd rename-directory-1 &&

		git checkout left-clean^0 &&

		test_must_fail git merge -s recursive right^0 &&

		test 2 -eq $(git ls-files -s | wc -l) &&
		test 1 -eq $(git ls-files -u | wc -l) &&
		test 1 -eq $(git ls-files -o | wc -l) &&

		echo 0 >expect &&
		git cat-file -p base:file >>expect &&
		echo 7 >>expect &&
		test_cmp expect newfile~HEAD &&

		test $(git rev-parse :2:newfile) = $(git hash-object expect) &&

		test -f newfile/realfile &&
		test -f newfile~HEAD
	)
'

test_expect_success 'rename/directory conflict + content merge conflict' '
	(
		cd rename-directory-1 &&

		git reset --hard &&
		git reset --hard &&
		git clean -fdqx &&

		git checkout left-conflict^0 &&

		test_must_fail git merge -s recursive right^0 &&

		test 4 -eq $(git ls-files -s | wc -l) &&
		test 3 -eq $(git ls-files -u | wc -l) &&