t/t6046-merge-skip-unneeded-updates.sh

   1 #!/bin/sh
   2
   3 test_description="merge cases"
   4
   5 # The setup for all of them, pictorially, is:
   6 #
   7 #      A
   8 #      o
   9 #     / \
  10 #  O o   ?
  11 #     \ /
  12 #      o
  13 #      B
  14 #
  15 # To help make it easier to follow the flow of tests, they have been
  16 # divided into sections and each test will start with a quick explanation
  17 # of what commits O, A, and B contain.
  18 #
  19 # Notation:
  20 #    z/{b,c}   means  files z/b and z/c both exist
  21 #    x/d_1     means  file x/d exists with content d1.  (Purpose of the
  22 #                     underscore notation is to differentiate different
  23 #                     files that might be renamed into each other's paths.)
  24
  25 . ./test-lib.sh
  26
  27
  28 ###########################################################################
  29 # SECTION 1: Cases involving no renames (one side has subset of changes of
  30 #            the other side)
  31 ###########################################################################
  32
  33 # Testcase 1a, Changes on A, subset of changes on B
  34 #   Commit O: b_1
  35 #   Commit A: b_2
  36 #   Commit B: b_3
  37 #   Expected: b_2
  38
  39 test_expect_success '1a-setup: Modify(A)/Modify(B), change on B subset of A' '
  40         test_create_repo 1a &&
  41         (
  42                 cd 1a &&
  43
  44                 test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
  45                 git add b &&
  46                 test_tick &&
  47                 git commit -m "O" &&
  48
  49                 git branch O &&
  50                 git branch A &&
  51                 git branch B &&
  52
  53                 git checkout A &&
  54                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 10.5 >b &&
  55                 git add b &&
  56                 test_tick &&
  57                 git commit -m "A" &&
  58
  59                 git checkout B &&
  60                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 >b &&
  61                 git add b &&
  62                 test_tick &&
  63                 git commit -m "B"
  64         )
  65 '
  66
  67 test_expect_success '1a-check-L: Modify(A)/Modify(B), change on B subset of A' '
  68         test_when_finished "git -C 1a reset --hard" &&
  69         test_when_finished "git -C 1a clean -fd" &&
  70         (
  71                 cd 1a &&
  72
  73                 git checkout A^0 &&
  74
  75                 test-tool chmtime =31337 b &&
  76                 test-tool chmtime -v +0 b >expected-mtime &&
  77
  78                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
  79
  80                 test_i18ngrep "Skipped b" out &&
  81                 test_must_be_empty err &&
  82
  83                 test-tool chmtime -v +0 b >actual-mtime &&
  84                 test_cmp expected-mtime actual-mtime &&
  85
  86                 git ls-files -s >index_files &&
  87                 test_line_count = 1 index_files &&
  88
  89                 git rev-parse >actual HEAD:b &&
  90                 git rev-parse >expect A:b &&
  91                 test_cmp expect actual &&
  92
  93                 git hash-object b   >actual &&
  94                 git rev-parse   A:b >expect &&
  95                 test_cmp expect actual
  96         )
  97 '
  98
  99 test_expect_success '1a-check-R: Modify(A)/Modify(B), change on B subset of A' '
 100         test_when_finished "git -C 1a reset --hard" &&
 101         test_when_finished "git -C 1a clean -fd" &&
 102         (
 103                 cd 1a &&
 104
 105                 git checkout B^0 &&
 106
 107                 GIT_MERGE_VERBOSITY=3 git merge -s recursive A^0 >out 2>err &&
 108
 109                 test_i18ngrep "Auto-merging b" out &&
 110                 test_must_be_empty err &&
 111
 112                 git ls-files -s >index_files &&
 113                 test_line_count = 1 index_files &&
 114
 115                 git rev-parse >actual HEAD:b &&
 116                 git rev-parse >expect A:b &&
 117                 test_cmp expect actual &&
 118
 119                 git hash-object b   >actual &&
 120                 git rev-parse   A:b >expect &&
 121                 test_cmp expect actual
 122         )
 123 '
 124
 125
 126 ###########################################################################
 127 # SECTION 2: Cases involving basic renames
 128 ###########################################################################
 129
 130 # Testcase 2a, Changes on A, rename on B
 131 #   Commit O: b_1
 132 #   Commit A: b_2
 133 #   Commit B: c_1
 134 #   Expected: c_2
 135
 136 test_expect_success '2a-setup: Modify(A)/rename(B)' '
 137         test_create_repo 2a &&
 138         (
 139                 cd 2a &&
 140
 141                 test_seq 1 10 >b &&
 142                 git add b &&
 143                 test_tick &&
 144                 git commit -m "O" &&
 145
 146                 git branch O &&
 147                 git branch A &&
 148                 git branch B &&
 149
 150                 git checkout A &&
 151                 test_seq 1 11 >b &&
 152                 git add b &&
 153                 test_tick &&
 154                 git commit -m "A" &&
 155
 156                 git checkout B &&
 157                 git mv b c &&
 158                 test_tick &&
 159                 git commit -m "B"
 160         )
 161 '
 162
 163 test_expect_success '2a-check-L: Modify/rename, merge into modify side' '
 164         test_when_finished "git -C 2a reset --hard" &&
 165         test_when_finished "git -C 2a clean -fd" &&
 166         (
 167                 cd 2a &&
 168
 169                 git checkout A^0 &&
 170
 171                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 172
 173                 test_i18ngrep ! "Skipped c" out &&
 174                 test_must_be_empty err &&
 175
 176                 git ls-files -s >index_files &&
 177                 test_line_count = 1 index_files &&
 178
 179                 git rev-parse >actual HEAD:c &&
 180                 git rev-parse >expect A:b &&
 181                 test_cmp expect actual &&
 182
 183                 git hash-object c   >actual &&
 184                 git rev-parse   A:b >expect &&
 185                 test_cmp expect actual &&
 186
 187                 test_must_fail git rev-parse HEAD:b &&
 188                 test_path_is_missing b
 189         )
 190 '
 191
 192 test_expect_success '2a-check-R: Modify/rename, merge into rename side' '
 193         test_when_finished "git -C 2a reset --hard" &&
 194         test_when_finished "git -C 2a clean -fd" &&
 195         (
 196                 cd 2a &&
 197
 198                 git checkout B^0 &&
 199
 200                 GIT_MERGE_VERBOSITY=3 git merge -s recursive A^0 >out 2>err &&
 201
 202                 test_i18ngrep ! "Skipped c" out &&
 203                 test_must_be_empty err &&
 204
 205                 git ls-files -s >index_files &&
 206                 test_line_count = 1 index_files &&
 207
 208                 git rev-parse >actual HEAD:c &&
 209                 git rev-parse >expect A:b &&
 210                 test_cmp expect actual &&
 211
 212                 git hash-object c   >actual &&
 213                 git rev-parse   A:b >expect &&
 214                 test_cmp expect actual &&
 215
 216                 test_must_fail git rev-parse HEAD:b &&
 217                 test_path_is_missing b
 218         )
 219 '
 220
 221 # Testcase 2b, Changed and renamed on A, subset of changes on B
 222 #   Commit O: b_1
 223 #   Commit A: c_2
 224 #   Commit B: b_3
 225 #   Expected: c_2
 226
 227 test_expect_success '2b-setup: Rename+Mod(A)/Mod(B), B mods subset of A' '
 228         test_create_repo 2b &&
 229         (
 230                 cd 2b &&
 231
 232                 test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
 233                 git add b &&
 234                 test_tick &&
 235                 git commit -m "O" &&
 236
 237                 git branch O &&
 238                 git branch A &&
 239                 git branch B &&
 240
 241                 git checkout A &&
 242                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 10.5 >b &&
 243                 git add b &&
 244                 git mv b c &&
 245                 test_tick &&
 246                 git commit -m "A" &&
 247
 248                 git checkout B &&
 249                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 >b &&
 250                 git add b &&
 251                 test_tick &&
 252                 git commit -m "B"
 253         )
 254 '
 255
 256 test_expect_success '2b-check-L: Rename+Mod(A)/Mod(B), B mods subset of A' '
 257         test_when_finished "git -C 2b reset --hard" &&
 258         test_when_finished "git -C 2b clean -fd" &&
 259         (
 260                 cd 2b &&
 261
 262                 git checkout A^0 &&
 263
 264                 test-tool chmtime =31337 c &&
 265                 test-tool chmtime -v +0 c >expected-mtime &&
 266
 267                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 268
 269                 test_i18ngrep "Skipped c" out &&
 270                 test_must_be_empty err &&
 271
 272                 test-tool chmtime -v +0 c >actual-mtime &&
 273                 test_cmp expected-mtime actual-mtime &&
 274
 275                 git ls-files -s >index_files &&
 276                 test_line_count = 1 index_files &&
 277
 278                 git rev-parse >actual HEAD:c &&
 279                 git rev-parse >expect A:c &&
 280                 test_cmp expect actual &&
 281
 282                 git hash-object c   >actual &&
 283                 git rev-parse   A:c >expect &&
 284                 test_cmp expect actual &&
 285
 286                 test_must_fail git rev-parse HEAD:b &&
 287                 test_path_is_missing b
 288         )
 289 '
 290
 291 test_expect_success '2b-check-R: Rename+Mod(A)/Mod(B), B mods subset of A' '
 292         test_when_finished "git -C 2b reset --hard" &&
 293         test_when_finished "git -C 2b clean -fd" &&
 294         (
 295                 cd 2b &&
 296
 297                 git checkout B^0 &&
 298
 299                 GIT_MERGE_VERBOSITY=3 git merge -s recursive A^0 >out 2>err &&
 300
 301                 test_i18ngrep "Auto-merging c" out &&
 302                 test_must_be_empty err &&
 303
 304                 git ls-files -s >index_files &&
 305                 test_line_count = 1 index_files &&
 306
 307                 git rev-parse >actual HEAD:c &&
 308                 git rev-parse >expect A:c &&
 309                 test_cmp expect actual &&
 310
 311                 git hash-object c   >actual &&
 312                 git rev-parse   A:c >expect &&
 313                 test_cmp expect actual &&
 314
 315                 test_must_fail git rev-parse HEAD:b &&
 316                 test_path_is_missing b
 317         )
 318 '
 319
 320 # Testcase 2c, Changes on A, rename on B
 321 #   Commit O: b_1
 322 #   Commit A: b_2, c_3
 323 #   Commit B: c_1
 324 #   Expected: rename/add conflict c_2 vs c_3
 325 #
 326 #   NOTE: Since A modified b_1->b_2, and B renamed b_1->c_1, the threeway
 327 #         merge of those files should result in c_2.  We then should have a
 328 #         rename/add conflict between c_2 and c_3.  However, if we note in
 329 #         merge_content() that A had the right contents (b_2 has same
 330 #         contents as c_2, just at a different name), and that A had the
 331 #         right path present (c_3 existed) and thus decides that it can
 332 #         skip the update, then we're in trouble.  This test verifies we do
 333 #         not make that particular mistake.
 334
 335 test_expect_success '2c-setup: Modify b & add c VS rename b->c' '
 336         test_create_repo 2c &&
 337         (
 338                 cd 2c &&
 339
 340                 test_seq 1 10 >b &&
 341                 git add b &&
 342                 test_tick &&
 343                 git commit -m "O" &&
 344
 345                 git branch O &&
 346                 git branch A &&
 347                 git branch B &&
 348
 349                 git checkout A &&
 350                 test_seq 1 11 >b &&
 351                 echo whatever >c &&
 352                 git add b c &&
 353                 test_tick &&
 354                 git commit -m "A" &&
 355
 356                 git checkout B &&
 357                 git mv b c &&
 358                 test_tick &&
 359                 git commit -m "B"
 360         )
 361 '
 362
 363 test_expect_success '2c-check: Modify b & add c VS rename b->c' '
 364         (
 365                 cd 2c &&
 366
 367                 git checkout A^0 &&
 368
 369                 GIT_MERGE_VERBOSITY=3 &&
 370                 export GIT_MERGE_VERBOSITY &&
 371                 test_must_fail git merge -s recursive B^0 >out 2>err &&
 372
 373                 test_i18ngrep "CONFLICT (rename/add): Rename b->c" out &&
 374                 test_i18ngrep ! "Skipped c" out &&
 375                 test_must_be_empty err
 376
 377                 # FIXME: rename/add conflicts are horribly broken right now;
 378                 # when I get back to my patch series fixing it and
 379                 # rename/rename(2to1) conflicts to bring them in line with
 380                 # how add/add conflicts behave, then checks like the below
 381                 # could be added.  But that patch series is waiting until
 382                 # the rename-directory-detection series lands, which this
 383                 # is part of.  And in the mean time, I do not want to further
 384                 # enforce broken behavior.  So for now, the main test is the
 385                 # one above that err is an empty file.
 386
 387                 #git ls-files -s >index_files &&
 388                 #test_line_count = 2 index_files &&
 389
 390                 #git rev-parse >actual :2:c :3:c &&
 391                 #git rev-parse >expect A:b  A:c  &&
 392                 #test_cmp expect actual &&
 393
 394                 #git cat-file -p A:b >>merged &&
 395                 #git cat-file -p A:c >>merge-me &&
 396                 #>empty &&
 397                 #test_must_fail git merge-file \
 398                 #       -L "Temporary merge branch 1" \
 399                 #       -L "" \
 400                 #       -L "Temporary merge branch 2" \
 401                 #       merged empty merge-me &&
 402                 #sed -e "s/^\([<=>]\)/\1\1\1/" merged >merged-internal &&
 403
 404                 #git hash-object c               >actual &&
 405                 #git hash-object merged-internal >expect &&
 406                 #test_cmp expect actual &&
 407
 408                 #test_path_is_missing b
 409         )
 410 '
 411
 412
 413 ###########################################################################
 414 # SECTION 3: Cases involving directory renames
 415 #
 416 # NOTE:
 417 #   Directory renames only apply when one side renames a directory, and the
 418 #   other side adds or renames a path into that directory.  Applying the
 419 #   directory rename to that new path creates a new pathname that didn't
 420 #   exist on either side of history.  Thus, it is impossible for the
 421 #   merge contents to already be at the right path, so all of these checks
 422 #   exist just to make sure that updates are not skipped.
 423 ###########################################################################
 424
 425 # Testcase 3a, Change + rename into dir foo on A, dir rename foo->bar on B
 426 #   Commit O: bq_1, foo/whatever
 427 #   Commit A: foo/{bq_2, whatever}
 428 #   Commit B: bq_1, bar/whatever
 429 #   Expected: bar/{bq_2, whatever}
 430
 431 test_expect_success '3a-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 432         test_create_repo 3a &&
 433         (
 434                 cd 3a &&
 435
 436                 mkdir foo &&
 437                 test_seq 1 10 >bq &&
 438                 test_write_lines a b c d e f g h i j k >foo/whatever &&
 439                 git add bq foo/whatever &&
 440                 test_tick &&
 441                 git commit -m "O" &&
 442
 443                 git branch O &&
 444                 git branch A &&
 445                 git branch B &&
 446
 447                 git checkout A &&
 448                 test_seq 1 11 >bq &&
 449                 git add bq &&
 450                 git mv bq foo/ &&
 451                 test_tick &&
 452                 git commit -m "A" &&
 453
 454                 git checkout B &&
 455                 git mv foo/ bar/ &&
 456                 test_tick &&
 457                 git commit -m "B"
 458         )
 459 '
 460
 461 test_expect_success '3a-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 462         test_when_finished "git -C 3a reset --hard" &&
 463         test_when_finished "git -C 3a clean -fd" &&
 464         (
 465                 cd 3a &&
 466
 467                 git checkout A^0 &&
 468
 469                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 470
 471                 test_i18ngrep ! "Skipped bar/bq" out &&
 472                 test_must_be_empty err &&
 473
 474                 git ls-files -s >index_files &&
 475                 test_line_count = 2 index_files &&
 476
 477                 git rev-parse >actual HEAD:bar/bq HEAD:bar/whatever &&
 478                 git rev-parse >expect A:foo/bq    A:foo/whatever &&
 479                 test_cmp expect actual &&
 480
 481                 git hash-object bar/bq   bar/whatever   >actual &&
 482                 git rev-parse   A:foo/bq A:foo/whatever >expect &&
 483                 test_cmp expect actual &&
 484
 485                 test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
 486                 test_path_is_missing bq foo/bq foo/whatever
 487         )
 488 '
 489
 490 test_expect_success '3a-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 491         test_when_finished "git -C 3a reset --hard" &&
 492         test_when_finished "git -C 3a clean -fd" &&
 493         (
 494                 cd 3a &&
 495
 496                 git checkout B^0 &&
 497
 498                 GIT_MERGE_VERBOSITY=3 git merge -s recursive A^0 >out 2>err &&
 499
 500                 test_i18ngrep ! "Skipped bar/bq" out &&
 501                 test_must_be_empty err &&
 502
 503                 git ls-files -s >index_files &&
 504                 test_line_count = 2 index_files &&
 505
 506                 git rev-parse >actual HEAD:bar/bq HEAD:bar/whatever &&
 507                 git rev-parse >expect A:foo/bq    A:foo/whatever &&
 508                 test_cmp expect actual &&
 509
 510                 git hash-object bar/bq   bar/whatever   >actual &&
 511                 git rev-parse   A:foo/bq A:foo/whatever >expect &&
 512                 test_cmp expect actual &&
 513
 514                 test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
 515                 test_path_is_missing bq foo/bq foo/whatever
 516         )
 517 '
 518
 519 # Testcase 3b, rename into dir foo on A, dir rename foo->bar + change on B
 520 #   Commit O: bq_1, foo/whatever
 521 #   Commit A: foo/{bq_1, whatever}
 522 #   Commit B: bq_2, bar/whatever
 523 #   Expected: bar/{bq_2, whatever}
 524
 525 test_expect_success '3b-setup: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 526         test_create_repo 3b &&
 527         (
 528                 cd 3b &&
 529
 530                 mkdir foo &&
 531                 test_seq 1 10 >bq &&
 532                 test_write_lines a b c d e f g h i j k >foo/whatever &&
 533                 git add bq foo/whatever &&
 534                 test_tick &&
 535                 git commit -m "O" &&
 536
 537                 git branch O &&
 538                 git branch A &&
 539                 git branch B &&
 540
 541                 git checkout A &&
 542                 git mv bq foo/ &&
 543                 test_tick &&
 544                 git commit -m "A" &&
 545
 546                 git checkout B &&
 547                 test_seq 1 11 >bq &&
 548                 git add bq &&
 549                 git mv foo/ bar/ &&
 550                 test_tick &&
 551                 git commit -m "B"
 552         )
 553 '
 554
 555 test_expect_success '3b-check-L: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 556         test_when_finished "git -C 3b reset --hard" &&
 557         test_when_finished "git -C 3b clean -fd" &&
 558         (
 559                 cd 3b &&
 560
 561                 git checkout A^0 &&
 562
 563                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 564
 565                 test_i18ngrep ! "Skipped bar/bq" out &&
 566                 test_must_be_empty err &&
 567
 568                 git ls-files -s >index_files &&
 569                 test_line_count = 2 index_files &&
 570
 571                 git rev-parse >actual HEAD:bar/bq HEAD:bar/whatever &&
 572                 git rev-parse >expect B:bq        A:foo/whatever &&
 573                 test_cmp expect actual &&
 574
 575                 git hash-object bar/bq bar/whatever   >actual &&
 576                 git rev-parse   B:bq   A:foo/whatever >expect &&
 577                 test_cmp expect actual &&
 578
 579                 test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
 580                 test_path_is_missing bq foo/bq foo/whatever
 581         )
 582 '
 583
 584 test_expect_success '3b-check-R: bq_1->foo/bq_2 on A, foo/->bar/ on B' '
 585         test_when_finished "git -C 3b reset --hard" &&
 586         test_when_finished "git -C 3b clean -fd" &&
 587         (
 588                 cd 3b &&
 589
 590                 git checkout B^0 &&
 591
 592                 GIT_MERGE_VERBOSITY=3 git merge -s recursive A^0 >out 2>err &&
 593
 594                 test_i18ngrep ! "Skipped bar/bq" out &&
 595                 test_must_be_empty err &&
 596
 597                 git ls-files -s >index_files &&
 598                 test_line_count = 2 index_files &&
 599
 600                 git rev-parse >actual HEAD:bar/bq HEAD:bar/whatever &&
 601                 git rev-parse >expect B:bq        A:foo/whatever &&
 602                 test_cmp expect actual &&
 603
 604                 git hash-object bar/bq bar/whatever   >actual &&
 605                 git rev-parse   B:bq   A:foo/whatever >expect &&
 606                 test_cmp expect actual &&
 607
 608                 test_must_fail git rev-parse HEAD:bq HEAD:foo/bq &&
 609                 test_path_is_missing bq foo/bq foo/whatever
 610         )
 611 '
 612
 613 ###########################################################################
 614 # SECTION 4: Cases involving dirty changes
 615 ###########################################################################
 616
 617 # Testcase 4a, Changed on A, subset of changes on B, locally modified
 618 #   Commit O: b_1
 619 #   Commit A: b_2
 620 #   Commit B: b_3
 621 #   Working copy: b_4
 622 #   Expected: b_2 for merge, b_4 in working copy
 623
 624 test_expect_success '4a-setup: Change on A, change on B subset of A, dirty mods present' '
 625         test_create_repo 4a &&
 626         (
 627                 cd 4a &&
 628
 629                 test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
 630                 git add b &&
 631                 test_tick &&
 632                 git commit -m "O" &&
 633
 634                 git branch O &&
 635                 git branch A &&
 636                 git branch B &&
 637
 638                 git checkout A &&
 639                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 10.5 >b &&
 640                 git add b &&
 641                 test_tick &&
 642                 git commit -m "A" &&
 643
 644                 git checkout B &&
 645                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 >b &&
 646                 git add b &&
 647                 test_tick &&
 648                 git commit -m "B"
 649         )
 650 '
 651
 652 # NOTE: For as long as we continue using unpack_trees() without index_only
 653 #   set to true, it will error out on a case like this claiming the the locally
 654 #   modified file would be overwritten by the merge.  Getting this testcase
 655 #   correct requires doing the merge in-memory first, then realizing that no
 656 #   updates to the file are necessary, and thus that we can just leave the path
 657 #   alone.
 658 test_expect_failure '4a-check: Change on A, change on B subset of A, dirty mods present' '
 659         test_when_finished "git -C 4a reset --hard" &&
 660         test_when_finished "git -C 4a clean -fd" &&
 661         (
 662                 cd 4a &&
 663
 664                 git checkout A^0 &&
 665                 echo "File rewritten" >b &&
 666
 667                 test-tool chmtime =31337 b &&
 668                 test-tool chmtime -v +0 b >expected-mtime &&
 669
 670                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 671
 672                 test_i18ngrep "Skipped b" out &&
 673                 test_must_be_empty err &&
 674
 675                 test-tool chmtime -v +0 b >actual-mtime &&
 676                 test_cmp expected-mtime actual-mtime &&
 677
 678                 git ls-files -s >index_files &&
 679                 test_line_count = 1 index_files &&
 680
 681                 git rev-parse >actual :0:b &&
 682                 git rev-parse >expect A:b &&
 683                 test_cmp expect actual &&
 684
 685                 git hash-object b >actual &&
 686                 echo "File rewritten" | git hash-object --stdin >expect &&
 687                 test_cmp expect actual
 688         )
 689 '
 690
 691 # Testcase 4b, Changed+renamed on A, subset of changes on B, locally modified
 692 #   Commit O: b_1
 693 #   Commit A: c_2
 694 #   Commit B: b_3
 695 #   Working copy: c_4
 696 #   Expected: c_2
 697
 698 test_expect_success '4b-setup: Rename+Mod(A)/Mod(B), change on B subset of A, dirty mods present' '
 699         test_create_repo 4b &&
 700         (
 701                 cd 4b &&
 702
 703                 test_write_lines 1 2 3 4 5 6 7 8 9 10 >b &&
 704                 git add b &&
 705                 test_tick &&
 706                 git commit -m "O" &&
 707
 708                 git branch O &&
 709                 git branch A &&
 710                 git branch B &&
 711
 712                 git checkout A &&
 713                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 10.5 >b &&
 714                 git add b &&
 715                 git mv b c &&
 716                 test_tick &&
 717                 git commit -m "A" &&
 718
 719                 git checkout B &&
 720                 test_write_lines 1 2 3 4 5 5.5 6 7 8 9 10 >b &&
 721                 git add b &&
 722                 test_tick &&
 723                 git commit -m "B"
 724         )
 725 '
 726
 727 test_expect_success '4b-check: Rename+Mod(A)/Mod(B), change on B subset of A, dirty mods present' '
 728         test_when_finished "git -C 4b reset --hard" &&
 729         test_when_finished "git -C 4b clean -fd" &&
 730         (
 731                 cd 4b &&
 732
 733                 git checkout A^0 &&
 734                 echo "File rewritten" >c &&
 735
 736                 test-tool chmtime =31337 c &&
 737                 test-tool chmtime -v +0 c >expected-mtime &&
 738
 739                 GIT_MERGE_VERBOSITY=3 git merge -s recursive B^0 >out 2>err &&
 740
 741                 test_i18ngrep "Skipped c" out &&
 742                 test_must_be_empty err &&
 743
 744                 test-tool chmtime -v +0 c >actual-mtime &&
 745                 test_cmp expected-mtime actual-mtime &&
 746
 747                 git ls-files -s >index_files &&
 748                 test_line_count = 1 index_files &&
 749
 750                 git rev-parse >actual :0:c &&
 751                 git rev-parse >expect A:c &&
 752                 test_cmp expect actual &&
 753
 754                 git hash-object c >actual &&
 755                 echo "File rewritten" | git hash-object --stdin >expect &&
 756                 test_cmp expect actual &&
 757
 758                 test_must_fail git rev-parse HEAD:b &&
 759                 test_path_is_missing b
 760         )
 761 '
 762
 763 test_done