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[PATCH v2 7/9] t6423, t6436: note improved ort handling with dirty files

From
Elijah Newren via GitGitGadget <gitgitgadget@gmail.com>
Date
Oct 26, 2020, 17:01 UTC
Message-ID
<c5350fd0aef44e5d7658ae1082d745a6a148cc73.1603731704.git.gitgitgadget@gmail.com>
In-Reply-To
<pull.769.v2.git.1603731704.gitgitgadget@gmail.com>
From: Elijah Newren <newren@gmail.com>

The "recursive" backend relies on unpack_trees() to check if unstaged changes would be overwritten by a merge, but unpack_trees() does not understand renames -- and once it returns, it has already written many updates to the working tree and index. As such, "recursive" had to do a special 4-way merge where it would need to also treat the working copy as an extra source of differences that we had to carefully avoid overwriting and resulting in moving files to new locations to avoid conflicts.

The "ort" backend, by contrast, does the complete merge inmemory, and only updates the index and working copy as a post-processing step. If there are dirty files in the way, it can simply abort the merge.

Update t6423 and t6436 to reflect the better merge abilities and expectations we have for ort, while still leaving the best-case-as-good-as-recursive-can-do expectations there for the recursive backend so we retain its stability until we are ready to deprecate and remove it.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 t/t6423-merge-rename-directories.sh | 266 ++++++++++++++++------------
 t/t6436-merge-overwrite.sh          |  18 +-
 2 files changed, 165 insertions(+), 119 deletions(-)
diff --git a/t/t6423-merge-rename-directories.sh b/t/t6423-merge-rename-directories.sh
index 7e32626913..32e6925ca4 100755
--- a/t/t6423-merge-rename-directories.sh
+++ b/t/t6423-merge-rename-directories.sh
@@ -3634,28 +3634,35 @@ test_expect_success '11a: Avoid losing dirty contents with simple rename' '
 		echo stuff >>z/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_i18ngrep "Refusing to lose dirty file at z/c" out &&
 
-		test_seq 1 10 >expected &&
-		echo stuff >>expected &&
-		test_cmp expected z/c &&
+			git ls-files -s >out &&
+			test_line_count = 2 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
 
-		git ls-files -s >out &&
-		test_line_count = 2 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 4 out &&
+			git rev-parse >actual \
+				:0:z/a :2:z/c &&
+			git rev-parse >expect \
+				 O:z/a  B:z/b &&
+			test_cmp expect actual &&
 
-		git rev-parse >actual \
-			:0:z/a :2:z/c &&
-		git rev-parse >expect \
-			 O:z/a  B:z/b &&
-		test_cmp expect actual &&
+			git hash-object z/c~HEAD >actual &&
+			git rev-parse B:z/b >expect &&
+			test_cmp expect actual
+		fi &&
+
+		test_seq 1 10 >expected &&
+		echo stuff >>expected &&
+		test_cmp expected z/c
 
-		git hash-object z/c~HEAD >actual &&
-		git rev-parse B:z/b >expect &&
-		test_cmp expect actual
 	)
 '
 
@@ -3706,32 +3713,39 @@ test_expect_success '11b: Avoid losing dirty file involved in directory rename'
 		git checkout A^0 &&
 		echo stuff >>z/c &&
 
-		git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
+			test_i18ngrep "Refusing to lose dirty file at z/c" out &&
 
-		grep -q stuff z/c &&
-		test_seq 1 10 >expected &&
-		echo stuff >>expected &&
-		test_cmp expected z/c &&
+			git ls-files -s >out &&
+			test_line_count = 3 out &&
+			git ls-files -u >out &&
+			test_line_count = 0 out &&
+			git ls-files -m >out &&
+			test_line_count = 0 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
 
-		git ls-files -s >out &&
-		test_line_count = 3 out &&
-		git ls-files -u >out &&
-		test_line_count = 0 out &&
-		git ls-files -m >out &&
-		test_line_count = 0 out &&
-		git ls-files -o >out &&
-		test_line_count = 4 out &&
+			git rev-parse >actual \
+				:0:x/b :0:y/a :0:y/c &&
+			git rev-parse >expect \
+				 O:x/b  O:z/a  B:x/c &&
+			test_cmp expect actual &&
 
-		git rev-parse >actual \
-			:0:x/b :0:y/a :0:y/c &&
-		git rev-parse >expect \
-			 O:x/b  O:z/a  B:x/c &&
-		test_cmp expect actual &&
+			git hash-object y/c >actual &&
+			git rev-parse B:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
-		git hash-object y/c >actual &&
-		git rev-parse B:x/c >expect &&
-		test_cmp expect actual
+		grep -q stuff z/c &&
+		test_seq 1 10 >expected &&
+		echo stuff >>expected &&
+		test_cmp expected z/c
 	)
 '
 
@@ -3783,7 +3797,13 @@ test_expect_success '11c: Avoid losing not-uptodate with rename + D/F conflict'
 		echo stuff >>y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "following files would be overwritten by merge" err &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_i18ngrep "following files would be overwritten by merge" err
+		fi &&
 
 		grep -q stuff y/c &&
 		test_seq 1 10 >expected &&
@@ -3851,29 +3871,35 @@ test_expect_success '11d: Avoid losing not-uptodate with rename + D/F conflict'
 		echo stuff >>z/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "Refusing to lose dirty file at z/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_i18ngrep "Refusing to lose dirty file at z/c" out &&
 
-		grep -q stuff z/c &&
-		test_seq 1 10 >expected &&
-		echo stuff >>expected &&
-		test_cmp expected z/c &&
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 1 out &&
+			git ls-files -o >out &&
+			test_line_count = 4 out &&
 
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 1 out &&
-		git ls-files -o >out &&
-		test_line_count = 5 out &&
+			git rev-parse >actual \
+				:0:x/b :0:y/a :0:y/c/d :3:y/c &&
+			git rev-parse >expect \
+				 O:x/b  O:z/a  B:y/c/d  B:x/c &&
+			test_cmp expect actual &&
 
-		git rev-parse >actual \
-			:0:x/b :0:y/a :0:y/c/d :3:y/c &&
-		git rev-parse >expect \
-			 O:x/b  O:z/a  B:y/c/d  B:x/c &&
-		test_cmp expect actual &&
+			git hash-object y/c~HEAD >actual &&
+			git rev-parse B:x/c >expect &&
+			test_cmp expect actual
+		fi &&
 
-		git hash-object y/c~HEAD >actual &&
-		git rev-parse B:x/c >expect &&
-		test_cmp expect actual
+		grep -q stuff z/c &&
+		test_seq 1 10 >expected &&
+		echo stuff >>expected &&
+		test_cmp expected z/c
 	)
 '
 
@@ -3931,37 +3957,43 @@ test_expect_success '11e: Avoid deleting not-uptodate with dir rename/rename(1to
 		echo mods >>y/c &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose dirty file at y/c" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_i18ngrep "CONFLICT (rename/rename)" out &&
+			test_i18ngrep "Refusing to lose dirty file at y/c" out &&
 
-		git ls-files -s >out &&
-		test_line_count = 7 out &&
-		git ls-files -u >out &&
-		test_line_count = 4 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
+			git ls-files -s >out &&
+			test_line_count = 7 out &&
+			git ls-files -u >out &&
+			test_line_count = 4 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
+
+			git rev-parse >actual \
+				:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :2:y/c :3:y/c &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  A:y/c  O:x/c &&
+			test_cmp expect actual &&
+
+			# See if y/c~merged has expected contents; requires manually
+			# doing the expected file merge
+			git cat-file -p A:y/c >c1 &&
+			git cat-file -p B:z/c >c2 &&
+			>empty &&
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				c1 empty c2 &&
+			test_cmp c1 y/c~merged
+		fi &&
 
 		echo different >expected &&
 		echo mods >>expected &&
-		test_cmp expected y/c &&
-
-		git rev-parse >actual \
-			:0:y/a :0:y/b :0:x/d :1:x/c :2:w/c :2:y/c :3:y/c &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/d  O:x/c  O:x/c  A:y/c  O:x/c &&
-		test_cmp expect actual &&
-
-		# See if y/c~merged has expected contents; requires manually
-		# doing the expected file merge
-		git cat-file -p A:y/c >c1 &&
-		git cat-file -p B:z/c >c2 &&
-		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			c1 empty c2 &&
-		test_cmp c1 y/c~merged
+		test_cmp expected y/c
 	)
 '
 
@@ -4014,38 +4046,44 @@ test_expect_success '11f: Avoid deleting not-uptodate with dir rename/rename(2to
 		echo important >>y/wham &&
 
 		test_must_fail git -c merge.directoryRenames=true merge -s recursive B^0 >out 2>err &&
-		test_i18ngrep "CONFLICT (rename/rename)" out &&
-		test_i18ngrep "Refusing to lose dirty file at y/wham" out &&
+		if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+		then
+			test_path_is_missing .git/MERGE_HEAD &&
+			test_i18ngrep "error: Your local changes to the following files would be overwritten by merge" err
+		else
+			test_i18ngrep "CONFLICT (rename/rename)" out &&
+			test_i18ngrep "Refusing to lose dirty file at y/wham" out &&
 
-		git ls-files -s >out &&
-		test_line_count = 4 out &&
-		git ls-files -u >out &&
-		test_line_count = 2 out &&
-		git ls-files -o >out &&
-		test_line_count = 3 out &&
+			git ls-files -s >out &&
+			test_line_count = 4 out &&
+			git ls-files -u >out &&
+			test_line_count = 2 out &&
+			git ls-files -o >out &&
+			test_line_count = 3 out &&
 
-		test_seq 1 10 >expected &&
-		echo important >>expected &&
-		test_cmp expected y/wham &&
+			test_must_fail git rev-parse :1:y/wham &&
 
-		test_must_fail git rev-parse :1:y/wham &&
+			git rev-parse >actual \
+				:0:y/a :0:y/b :2:y/wham :3:y/wham &&
+			git rev-parse >expect \
+				 O:z/a  O:z/b  O:x/c     O:x/d &&
+			test_cmp expect actual &&
 
-		git rev-parse >actual \
-			:0:y/a :0:y/b :2:y/wham :3:y/wham &&
-		git rev-parse >expect \
-			 O:z/a  O:z/b  O:x/c     O:x/d &&
-		test_cmp expect actual &&
+			# Test that two-way merge in y/wham~merged is as expected
+			git cat-file -p :2:y/wham >expect &&
+			git cat-file -p :3:y/wham >other &&
+			>empty &&
+			test_must_fail git merge-file \
+				-L "HEAD" \
+				-L "" \
+				-L "B^0" \
+				expect empty other &&
+			test_cmp expect y/wham~merged
+		fi &&
 
-		# Test that the two-way merge in y/wham~merged is as expected
-		git cat-file -p :2:y/wham >expect &&
-		git cat-file -p :3:y/wham >other &&
-		>empty &&
-		test_must_fail git merge-file \
-			-L "HEAD" \
-			-L "" \
-			-L "B^0" \
-			expect empty other &&
-		test_cmp expect y/wham~merged
+		test_seq 1 10 >expected &&
+		echo important >>expected &&
+		test_cmp expected y/wham
 	)
 '
 
diff --git a/t/t6436-merge-overwrite.sh b/t/t6436-merge-overwrite.sh
index dd8ab7ede1..dd9376842f 100755
--- a/t/t6436-merge-overwrite.sh
+++ b/t/t6436-merge-overwrite.sh
@@ -97,11 +97,19 @@ test_expect_success 'will not overwrite unstaged changes in renamed file' '
 	git mv c1.c other.c &&
 	git commit -m rename &&
 	cp important other.c &&
-	test_must_fail git merge c1a >out &&
-	test_i18ngrep "Refusing to lose dirty file at other.c" out &&
-	test_path_is_file other.c~HEAD &&
-	test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
-	test_cmp important other.c
+	if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+	then
+		test_must_fail git merge c1a >out 2>err &&
+		test_i18ngrep "would be overwritten by merge" err &&
+		test_cmp important other.c &&
+		test_path_is_missing .git/MERGE_HEAD
+	else
+		test_must_fail git merge c1a >out &&
+		test_i18ngrep "Refusing to lose dirty file at other.c" out &&
+		test_path_is_file other.c~HEAD &&
+		test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
+		test_cmp important other.c
+	fi
 '
 
 test_expect_success 'will not overwrite untracked subtree' '

-- 
gitgitgadget
Previous: Elijah Newren via GitGitGadgetNext: Elijah Newren via GitGitGadget
Message 23 of 31 in “Support both merge backends in the testsuite, via environment variable”
  1. 0/9 Support both merge backends in the testsuite, via environment variableElijah Newren via GitGitGadget, Oct 23, 2020
  2. 2/9 merge tests: expect improved directory/file conflict handling in ortElijah Newren via GitGitGadget, Oct 23, 2020
  3. Elijah NewrenOct 23, 2020
  4. 3/9 t6416: correct expectation for rename/rename(1to2) + directory/fileElijah Newren via GitGitGadget, Oct 23, 2020
  5. 1/9 t/: new helper for tests that pass with ort but fail with recursiveElijah Newren via GitGitGadget, Oct 23, 2020
  6. Junio C HamanoOct 23, 2020
  7. Elijah NewrenOct 23, 2020
  8. Elijah NewrenOct 23, 2020
  9. Đoàn Trần Công DanhOct 24, 2020
  10. Elijah NewrenOct 24, 2020
  11. Đoàn Trần Công DanhOct 25, 2020
  12. Elijah NewrenOct 26, 2020
  13. Junio C HamanoOct 26, 2020
  14. 4/9 t6404, t6423: expect improved rename/delete handling in ort backendElijah Newren via GitGitGadget, Oct 23, 2020
  15. 5/9 t6423: expect improved conflict markers labels in the ort backendElijah Newren via GitGitGadget, Oct 23, 2020
  16. 6/9 merge tests: expect slight differences in output for recursive vs. ortElijah Newren via GitGitGadget, Oct 23, 2020
  17. Elijah NewrenOct 24, 2020
  18. 9/9 t6423: add more details about direct resolution of directoriesElijah Newren via GitGitGadget, Oct 23, 2020
  19. Elijah NewrenOct 23, 2020
  20. 7/9 t6423, t6436: note improved ort handling with dirty filesElijah Newren via GitGitGadget, Oct 23, 2020
  21. 8/9 t6423: note improved ort handling with untracked filesElijah Newren via GitGitGadget, Oct 23, 2020
  22. 0/9 Support both merge backends in the testsuite, via environment variableElijah Newren via GitGitGadget, Oct 26, 2020
  23. 7/9 t6423, t6436: note improved ort handling with dirty filesElijah Newren via GitGitGadget, Oct 26, 2020
  24. 9/9 t6423: add more details about direct resolution of directoriesElijah Newren via GitGitGadget, Oct 26, 2020
  25. 8/9 t6423: note improved ort handling with untracked filesElijah Newren via GitGitGadget, Oct 26, 2020
  26. 6/9 merge tests: expect slight differences in output for recursive vs. ortElijah Newren via GitGitGadget, Oct 26, 2020
  27. 5/9 t6423: expect improved conflict markers labels in the ort backendElijah Newren via GitGitGadget, Oct 26, 2020
  28. 4/9 t6404, t6423: expect improved rename/delete handling in ort backendElijah Newren via GitGitGadget, Oct 26, 2020
  29. 2/9 merge tests: expect improved directory/file conflict handling in ortElijah Newren via GitGitGadget, Oct 26, 2020
  30. 1/9 t/: new helper for tests that pass with ort but fail with recursiveElijah Newren via GitGitGadget, Oct 26, 2020
  31. 3/9 t6416: correct expectation for rename/rename(1to2) + directory/fileElijah Newren via GitGitGadget, Oct 26, 2020

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