3 test_description='recursive merge corner cases involving criss-cross merges'
7 get_clean_checkout () {
23 test_expect_success 'setup basic criss-cross + rename with no modifications' '
24 ten="0 1 2 3 4 5 6 7 8 9" &&
27 echo line $i in a sample file
31 echo line $i in another sample file
34 test_tick && git commit -m initial &&
39 test_tick && git commit -m R1 &&
43 test_tick && git commit -m L1 &&
46 test_tick && git merge -s ours R1 &&
50 test_tick && git merge -s ours L1 &&
54 test_expect_success 'merge simple rename+criss-cross with no modifications' '
58 test_must_fail git merge -s recursive R2^0 &&
60 test 2 = $(git ls-files -s | wc -l) &&
61 test 2 = $(git ls-files -u | wc -l) &&
62 test 2 = $(git ls-files -o | wc -l) &&
64 test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
65 test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
67 test $(git rev-parse L2:three) = $(git hash-object three~HEAD) &&
68 test $(git rev-parse R2:three) = $(git hash-object three~R2^0)
72 # Same as before, but modify L1 slightly:
83 test_expect_success 'setup criss-cross + rename merges with basic modification' '
89 ten="0 1 2 3 4 5 6 7 8 9" &&
92 echo line $i in a sample file
96 echo line $i in another sample file
99 test_tick && git commit -m initial &&
102 git checkout -b R1 &&
106 test_tick && git commit -m R1 &&
110 test_tick && git commit -m L1 &&
113 test_tick && git merge -s ours R1 &&
117 test_tick && git merge -s ours L1 &&
121 test_expect_success 'merge criss-cross + rename merges with basic modification' '
125 test_must_fail git merge -s recursive R2^0 &&
127 test 2 = $(git ls-files -s | wc -l) &&
128 test 2 = $(git ls-files -u | wc -l) &&
129 test 2 = $(git ls-files -o | wc -l) &&
131 test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
132 test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
134 test $(git rev-parse L2:three) = $(git hash-object three~HEAD) &&
135 test $(git rev-parse R2:three) = $(git hash-object three~R2^0)
139 # For the next test, we start with three commits in two lines of development
140 # which setup a rename/add conflict:
141 # Commit A: File 'a' exists
142 # Commit B: Rename 'a' -> 'new_a'
143 # Commit C: Modify 'a', create different 'new_a'
144 # Later, two different people merge and resolve differently:
145 # Commit D: Merge B & C, ignoring separately created 'new_a'
146 # Commit E: Merge B & C making use of some piece of secondary 'new_a'
147 # Finally, someone goes to merge D & E. Does git detect the conflict?
158 test_expect_success 'setup differently handled merges of rename/add conflict' '
164 printf "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n" >a &&
166 test_tick && git commit -m A &&
171 echo "other content" >>new_a &&
173 test_tick && git commit -m C &&
177 test_tick && git commit -m B &&
180 test_must_fail git merge C &&
182 test_tick && git commit -m D &&
186 test_must_fail git merge B &&
187 rm new_a~HEAD new_a &&
188 printf "Incorrectly merged content" >>new_a &&
190 test_tick && git commit -m E &&
194 test_expect_success 'git detects differently handled merges conflict' '
198 test_must_fail git merge -s recursive E^0 &&
200 test 3 = $(git ls-files -s | wc -l) &&
201 test 3 = $(git ls-files -u | wc -l) &&
202 test 0 = $(git ls-files -o | wc -l) &&
204 test $(git rev-parse :2:new_a) = $(git rev-parse D:new_a) &&
205 test $(git rev-parse :3:new_a) = $(git rev-parse E:new_a) &&
207 git cat-file -p B:new_a >>merged &&
208 git cat-file -p C:new_a >>merge-me &&
210 test_must_fail git merge-file \
211 -L "Temporary merge branch 2" \
213 -L "Temporary merge branch 1" \
214 merged empty merge-me &&
215 test $(git rev-parse :1:new_a) = $(git hash-object merged)
219 # criss-cross + modify/delete:
229 # Commit A: file with contents 'A\n'
230 # Commit B: file with contents 'B\n'
231 # Commit C: file not present
232 # Commit D: file with contents 'B\n'
233 # Commit E: file not present
235 # Merging commits D & E should result in modify/delete conflict.
237 test_expect_success 'setup criss-cross + modify/delete resolved differently' '
261 test_must_fail git merge C &&
269 test_must_fail git merge B &&
276 test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
279 test_must_fail git merge -s recursive E^0 &&
281 test 2 -eq $(git ls-files -s | wc -l) &&
282 test 2 -eq $(git ls-files -u | wc -l) &&
284 test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
285 test $(git rev-parse :2:file) = $(git rev-parse B:file)
288 test_expect_success 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
292 test_must_fail git merge -s recursive D^0 &&
294 test 2 -eq $(git ls-files -s | wc -l) &&
295 test 2 -eq $(git ls-files -u | wc -l) &&
297 test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
298 test $(git rev-parse :3:file) = $(git rev-parse B:file)
302 # criss-cross + modify/modify with very contrived file contents:
312 # Commit A: file with contents 'A\n'
313 # Commit B: file with contents 'B\n'
314 # Commit C: file with contents 'C\n'
315 # Commit D: file with contents 'D\n'
316 # Commit E: file with contents:
317 # <<<<<<< Temporary merge branch 1
321 # >>>>>>> Temporary merge branch 2
323 # Now, when we merge commits D & E, does git detect the conflict?
325 test_expect_success 'setup differently handled merges of content conflict' '
349 test_must_fail git merge C &&
357 test_must_fail git merge B &&
359 <<<<<<< Temporary merge branch 1
363 >>>>>>> Temporary merge branch 2
371 test_expect_failure 'git detects conflict w/ criss-cross+contrived resolution' '
374 test_must_fail git merge -s recursive E^0 &&
376 test 3 -eq $(git ls-files -s | wc -l) &&
377 test 3 -eq $(git ls-files -u | wc -l) &&
378 test 0 -eq $(git ls-files -o | wc -l) &&
380 test $(git rev-parse :2:file) = $(git rev-parse D:file) &&
381 test $(git rev-parse :3:file) = $(git rev-parse E:file)
385 # criss-cross + d/f conflict via add/add:
386 # Commit A: Neither file 'a' nor directory 'a/' exists.
387 # Commit B: Introduce 'a'
388 # Commit C: Introduce 'a/file'
389 # Commit D: Merge B & C, keeping 'a' and deleting 'a/'
391 # Two different later cases:
392 # Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
393 # Commit E2: Merge B & C, deleting 'a' but keeping a slightly modified 'a/file'
403 # Merging D & E1 requires we first create a virtual merge base X from
404 # merging A & B in memory. Now, if X could keep both 'a' and 'a/file' in
405 # the index, then the merge of D & E1 could be resolved cleanly with both
406 # 'a' and 'a/file' removed. Since git does not currently allow creating
407 # such a tree, the best we can do is have X contain both 'a~<unique>' and
408 # 'a/file' resulting in the merge of D and E1 having a rename/delete
409 # conflict for 'a'. (Although this merge appears to be unsolvable with git
410 # currently, git could do a lot better than it currently does with these
411 # d/f conflicts, which is the purpose of this test.)
413 # Merge of D & E2 has similar issues for path 'a', but should always result
414 # in a modify/delete conflict for path 'a/file'.
416 # We run each merge in both directions, to check for directional issues
417 # with D/F conflict handling.
420 test_expect_success 'setup differently handled merges of directory/file conflict' '
447 test_must_fail git merge C &&
457 test_must_fail git merge B &&
467 test_must_fail git merge B &&
470 printf "10\n11\n" >a/file &&
477 test_expect_success 'merge of D & E1 fails but has appropriate contents' '
478 get_clean_checkout D^0 &&
480 test_must_fail git merge -s recursive E1^0 &&
482 test 2 -eq $(git ls-files -s | wc -l) &&
483 test 1 -eq $(git ls-files -u | wc -l) &&
484 test 0 -eq $(git ls-files -o | wc -l) &&
486 test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
487 test $(git rev-parse :2:a) = $(git rev-parse B:a)
490 test_expect_success 'merge of E1 & D fails but has appropriate contents' '
491 get_clean_checkout E1^0 &&
493 test_must_fail git merge -s recursive D^0 &&
495 test 2 -eq $(git ls-files -s | wc -l) &&
496 test 1 -eq $(git ls-files -u | wc -l) &&
497 test 0 -eq $(git ls-files -o | wc -l) &&
499 test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
500 test $(git rev-parse :3:a) = $(git rev-parse B:a)
503 test_expect_success 'merge of D & E2 fails but has appropriate contents' '
504 get_clean_checkout D^0 &&
506 test_must_fail git merge -s recursive E2^0 &&
508 test 4 -eq $(git ls-files -s | wc -l) &&
509 test 3 -eq $(git ls-files -u | wc -l) &&
510 test 1 -eq $(git ls-files -o | wc -l) &&
512 test $(git rev-parse :2:a) = $(git rev-parse B:a) &&
513 test $(git rev-parse :3:a/file) = $(git rev-parse E2:a/file) &&
514 test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
515 test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
520 test_expect_success 'merge of E2 & D fails but has appropriate contents' '
521 get_clean_checkout E2^0 &&
523 test_must_fail git merge -s recursive D^0 &&
525 test 4 -eq $(git ls-files -s | wc -l) &&
526 test 3 -eq $(git ls-files -u | wc -l) &&
527 test 1 -eq $(git ls-files -o | wc -l) &&
529 test $(git rev-parse :3:a) = $(git rev-parse B:a) &&
530 test $(git rev-parse :2:a/file) = $(git rev-parse E2:a/file) &&
531 test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
532 test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
538 # criss-cross with rename/rename(1to2)/modify followed by
539 # rename/rename(2to1)/modify:
549 # Commit A: new file: a
550 # Commit B: rename a->b, modifying by adding a line
551 # Commit C: rename a->c
552 # Commit D: merge B&C, resolving conflict by keeping contents in newname
553 # Commit E: merge B&C, resolving conflict similar to D but adding another line
555 # There is a conflict merging B & C, but one of filename not of file
556 # content. Whoever created D and E chose specific resolutions for that
557 # conflict resolution. Now, since: (1) there is no content conflict
558 # merging B & C, (2) D does not modify that merged content further, and (3)
559 # both D & E resolve the name conflict in the same way, the modification to
560 # newname in E should not cause any conflicts when it is merged with D.
561 # (Note that this can be accomplished by having the virtual merge base have
562 # the merged contents of b and c stored in a file named a, which seems like
563 # the most logical choice anyway.)
565 # Comment from Junio: I do not necessarily agree with the choice "a", but
566 # it feels sound to say "B and C do not agree what the final pathname
567 # should be, but we know this content was derived from the common A:a so we
568 # use one path whose name is arbitrary in the virtual merge base X between
569 # D and E" and then further let the rename detection to notice that that
570 # arbitrary path gets renamed between X-D to "newname" and X-E also to
571 # "newname" to resolve it as both sides renaming it to the same new
572 # name. It is akin to what we do at the content level, i.e. "B and C do not
573 # agree what the final contents should be, so we leave the conflict marker
574 # but that may cancel out at the final merge stage".
576 test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
583 printf "1\n2\n3\n4\n5\n6\n" >a &&
588 git checkout -b B A &&
594 git checkout -b C A &&
598 git checkout -q B^0 &&
599 git merge --no-commit -s ours C^0 &&
601 git commit -m "Merge commit C^0 into HEAD" &&
604 git checkout -q C^0 &&
605 git merge --no-commit -s ours B^0 &&
607 printf "7\n8\n" >>newname &&
609 git commit -m "Merge commit B^0 into HEAD" &&
613 test_expect_success 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
616 git merge -s recursive E^0 &&
618 test 1 -eq $(git ls-files -s | wc -l) &&
619 test 0 -eq $(git ls-files -u | wc -l) &&
620 test 0 -eq $(git ls-files -o | wc -l) &&
622 test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
626 # criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
636 # Commit A: new file: a
637 # Commit B: rename a->b
638 # Commit C: rename a->c, add different a
639 # Commit D: merge B&C, keeping b&c and (new) a modified at beginning
640 # Commit E: merge B&C, keeping b&c and (new) a modified at end
642 # Merging commits D & E should result in no conflict; doing so correctly
643 # requires getting the virtual merge base (from merging B&C) right, handling
644 # renaming carefully (both in the virtual merge base and later), and getting
645 # content merge handled.
647 test_expect_success 'setup criss-cross + rename/rename/add + modify/modify' '
653 printf "lots\nof\nwords\nand\ncontent\n" >a &&
658 git checkout -b B A &&
662 git checkout -b C A &&
664 printf "2\n3\n4\n5\n6\n7\n" >a &&
669 git merge --no-commit -s ours C^0 &&
670 git checkout C -- a c &&
676 git commit -m "Merge commit C^0 into HEAD" &&
680 git merge --no-commit -s ours B^0 &&
681 git checkout B -- b &&
684 git commit -m "Merge commit B^0 into HEAD" &&
688 test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
691 git merge -s recursive E^0 &&
693 test 3 -eq $(git ls-files -s | wc -l) &&
694 test 0 -eq $(git ls-files -u | wc -l) &&
695 test 0 -eq $(git ls-files -o | wc -l) &&
697 test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
698 test $(git rev-parse HEAD:c) = $(git rev-parse A:a) &&
699 test "$(cat a)" = "$(printf "1\n2\n3\n4\n5\n6\n7\n8\n")"
703 # criss-cross with rename/rename(1to2)/add-dest + simple modify:
713 # Commit A: new file: a
714 # Commit B: rename a->b, add c
715 # Commit C: rename a->c
716 # Commit D: merge B&C, keeping A:a and B:c
717 # Commit E: merge B&C, keeping A:a and slightly modified c from B
719 # Merging commits D & E should result in no conflict. The virtual merge
720 # base of B & C needs to not delete B:c for that to work, though...
722 test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
733 git checkout -b B A &&
735 printf "1\n2\n3\n4\n5\n6\n7\n" >c &&
739 git checkout -b C A &&
744 git merge --no-commit -s ours C^0 &&
746 git commit -m "D is like B but renames b back to a" &&
750 git merge --no-commit -s ours C^0 &&
754 git commit -m "E like D but has mod in c" &&
758 test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
761 git merge -s recursive E^0 &&
763 test 2 -eq $(git ls-files -s | wc -l) &&
764 test 0 -eq $(git ls-files -u | wc -l) &&
765 test 0 -eq $(git ls-files -o | wc -l) &&
767 test $(git rev-parse HEAD:a) = $(git rev-parse A:a) &&
768 test $(git rev-parse HEAD:c) = $(git rev-parse E:c)