Andrew's git / gitweb.git / t/t6036-recursive-corner-cases.sh
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t / t6036-recursive-corner-cases.shon commit git_config_set: reuse empty sections (c71d8bb)
   1#!/bin/sh
   2
   3test_description='recursive merge corner cases involving criss-cross merges'
   4
   5. ./test-lib.sh
   6
   7get_clean_checkout () {
   8        git reset --hard &&
   9        git clean -fdqx &&
  10        git checkout "$1"
  11}
  12
  13#
  14#  L1  L2
  15#   o---o
  16#  / \ / \
  17# o   X   ?
  18#  \ / \ /
  19#   o---o
  20#  R1  R2
  21#
  22
  23test_expect_success 'setup basic criss-cross + rename with no modifications' '
  24        ten="0 1 2 3 4 5 6 7 8 9" &&
  25        for i in $ten
  26        do
  27                echo line $i in a sample file
  28        done >one &&
  29        for i in $ten
  30        do
  31                echo line $i in another sample file
  32        done >two &&
  33        git add one two &&
  34        test_tick && git commit -m initial &&
  35
  36        git branch L1 &&
  37        git checkout -b R1 &&
  38        git mv one three &&
  39        test_tick && git commit -m R1 &&
  40
  41        git checkout L1 &&
  42        git mv two three &&
  43        test_tick && git commit -m L1 &&
  44
  45        git checkout L1^0 &&
  46        test_tick && git merge -s ours R1 &&
  47        git tag L2 &&
  48
  49        git checkout R1^0 &&
  50        test_tick && git merge -s ours L1 &&
  51        git tag R2
  52'
  53
  54test_expect_success 'merge simple rename+criss-cross with no modifications' '
  55        git reset --hard &&
  56        git checkout L2^0 &&
  57
  58        test_must_fail git merge -s recursive R2^0 &&
  59
  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) &&
  63
  64        test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
  65        test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
  66
  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)
  69'
  70
  71#
  72# Same as before, but modify L1 slightly:
  73#
  74#  L1m L2
  75#   o---o
  76#  / \ / \
  77# o   X   ?
  78#  \ / \ /
  79#   o---o
  80#  R1  R2
  81#
  82
  83test_expect_success 'setup criss-cross + rename merges with basic modification' '
  84        git rm -rf . &&
  85        git clean -fdqx &&
  86        rm -rf .git &&
  87        git init &&
  88
  89        ten="0 1 2 3 4 5 6 7 8 9" &&
  90        for i in $ten
  91        do
  92                echo line $i in a sample file
  93        done >one &&
  94        for i in $ten
  95        do
  96                echo line $i in another sample file
  97        done >two &&
  98        git add one two &&
  99        test_tick && git commit -m initial &&
 100
 101        git branch L1 &&
 102        git checkout -b R1 &&
 103        git mv one three &&
 104        echo more >>two &&
 105        git add two &&
 106        test_tick && git commit -m R1 &&
 107
 108        git checkout L1 &&
 109        git mv two three &&
 110        test_tick && git commit -m L1 &&
 111
 112        git checkout L1^0 &&
 113        test_tick && git merge -s ours R1 &&
 114        git tag L2 &&
 115
 116        git checkout R1^0 &&
 117        test_tick && git merge -s ours L1 &&
 118        git tag R2
 119'
 120
 121test_expect_success 'merge criss-cross + rename merges with basic modification' '
 122        git reset --hard &&
 123        git checkout L2^0 &&
 124
 125        test_must_fail git merge -s recursive R2^0 &&
 126
 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) &&
 130
 131        test $(git rev-parse :2:three) = $(git rev-parse L2:three) &&
 132        test $(git rev-parse :3:three) = $(git rev-parse R2:three) &&
 133
 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)
 136'
 137
 138#
 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?
 148#
 149#      B   D
 150#      o---o
 151#     / \ / \
 152#  A o   X   ? F
 153#     \ / \ /
 154#      o---o
 155#      C   E
 156#
 157
 158test_expect_success 'setup differently handled merges of rename/add conflict' '
 159        git rm -rf . &&
 160        git clean -fdqx &&
 161        rm -rf .git &&
 162        git init &&
 163
 164        printf "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n" >a &&
 165        git add a &&
 166        test_tick && git commit -m A &&
 167
 168        git branch B &&
 169        git checkout -b C &&
 170        echo 10 >>a &&
 171        echo "other content" >>new_a &&
 172        git add a new_a &&
 173        test_tick && git commit -m C &&
 174
 175        git checkout B &&
 176        git mv a new_a &&
 177        test_tick && git commit -m B &&
 178
 179        git checkout B^0 &&
 180        test_must_fail git merge C &&
 181        git clean -f &&
 182        test_tick && git commit -m D &&
 183        git tag D &&
 184
 185        git checkout C^0 &&
 186        test_must_fail git merge B &&
 187        rm new_a~HEAD new_a &&
 188        printf "Incorrectly merged content" >>new_a &&
 189        git add -u &&
 190        test_tick && git commit -m E &&
 191        git tag E
 192'
 193
 194test_expect_success 'git detects differently handled merges conflict' '
 195        git reset --hard &&
 196        git checkout D^0 &&
 197
 198        test_must_fail git merge -s recursive E^0 &&
 199
 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) &&
 203
 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) &&
 206
 207        git cat-file -p B:new_a >>merged &&
 208        git cat-file -p C:new_a >>merge-me &&
 209        >empty &&
 210        test_must_fail git merge-file \
 211                -L "Temporary merge branch 2" \
 212                -L "" \
 213                -L "Temporary merge branch 1" \
 214                merged empty merge-me &&
 215        sed -e "s/^\([<=>]\)/\1\1\1/" merged >merged-internal &&
 216        test $(git rev-parse :1:new_a) = $(git hash-object merged-internal)
 217'
 218
 219#
 220# criss-cross + modify/delete:
 221#
 222#      B   D
 223#      o---o
 224#     / \ / \
 225#  A o   X   ? F
 226#     \ / \ /
 227#      o---o
 228#      C   E
 229#
 230#   Commit A: file with contents 'A\n'
 231#   Commit B: file with contents 'B\n'
 232#   Commit C: file not present
 233#   Commit D: file with contents 'B\n'
 234#   Commit E: file not present
 235#
 236# Merging commits D & E should result in modify/delete conflict.
 237
 238test_expect_success 'setup criss-cross + modify/delete resolved differently' '
 239        git rm -rf . &&
 240        git clean -fdqx &&
 241        rm -rf .git &&
 242        git init &&
 243
 244        echo A >file &&
 245        git add file &&
 246        test_tick &&
 247        git commit -m A &&
 248
 249        git branch B &&
 250        git checkout -b C &&
 251        git rm file &&
 252        test_tick &&
 253        git commit -m C &&
 254
 255        git checkout B &&
 256        echo B >file &&
 257        git add file &&
 258        test_tick &&
 259        git commit -m B &&
 260
 261        git checkout B^0 &&
 262        test_must_fail git merge C &&
 263        echo B >file &&
 264        git add file &&
 265        test_tick &&
 266        git commit -m D &&
 267        git tag D &&
 268
 269        git checkout C^0 &&
 270        test_must_fail git merge B &&
 271        git rm file &&
 272        test_tick &&
 273        git commit -m E &&
 274        git tag E
 275'
 276
 277test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
 278        git checkout D^0 &&
 279
 280        test_must_fail git merge -s recursive E^0 &&
 281
 282        test 2 -eq $(git ls-files -s | wc -l) &&
 283        test 2 -eq $(git ls-files -u | wc -l) &&
 284
 285        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 286        test $(git rev-parse :2:file) = $(git rev-parse B:file)
 287'
 288
 289test_expect_success 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
 290        git reset --hard &&
 291        git checkout E^0 &&
 292
 293        test_must_fail git merge -s recursive D^0 &&
 294
 295        test 2 -eq $(git ls-files -s | wc -l) &&
 296        test 2 -eq $(git ls-files -u | wc -l) &&
 297
 298        test $(git rev-parse :1:file) = $(git rev-parse master:file) &&
 299        test $(git rev-parse :3:file) = $(git rev-parse B:file)
 300'
 301
 302#
 303# criss-cross + d/f conflict via add/add:
 304#   Commit A: Neither file 'a' nor directory 'a/' exists.
 305#   Commit B: Introduce 'a'
 306#   Commit C: Introduce 'a/file'
 307#   Commit D: Merge B & C, keeping 'a' and deleting 'a/'
 308#
 309# Two different later cases:
 310#   Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
 311#   Commit E2: Merge B & C, deleting 'a' but keeping a slightly modified 'a/file'
 312#
 313#      B   D
 314#      o---o
 315#     / \ / \
 316#  A o   X   ? F
 317#     \ / \ /
 318#      o---o
 319#      C   E1 or E2
 320#
 321# Merging D & E1 requires we first create a virtual merge base X from
 322# merging A & B in memory.  Now, if X could keep both 'a' and 'a/file' in
 323# the index, then the merge of D & E1 could be resolved cleanly with both
 324# 'a' and 'a/file' removed.  Since git does not currently allow creating
 325# such a tree, the best we can do is have X contain both 'a~<unique>' and
 326# 'a/file' resulting in the merge of D and E1 having a rename/delete
 327# conflict for 'a'.  (Although this merge appears to be unsolvable with git
 328# currently, git could do a lot better than it currently does with these
 329# d/f conflicts, which is the purpose of this test.)
 330#
 331# Merge of D & E2 has similar issues for path 'a', but should always result
 332# in a modify/delete conflict for path 'a/file'.
 333#
 334# We run each merge in both directions, to check for directional issues
 335# with D/F conflict handling.
 336#
 337
 338test_expect_success 'setup differently handled merges of directory/file conflict' '
 339        git rm -rf . &&
 340        git clean -fdqx &&
 341        rm -rf .git &&
 342        git init &&
 343
 344        >ignore-me &&
 345        git add ignore-me &&
 346        test_tick &&
 347        git commit -m A &&
 348        git tag A &&
 349
 350        git branch B &&
 351        git checkout -b C &&
 352        mkdir a &&
 353        echo 10 >a/file &&
 354        git add a/file &&
 355        test_tick &&
 356        git commit -m C &&
 357
 358        git checkout B &&
 359        echo 5 >a &&
 360        git add a &&
 361        test_tick &&
 362        git commit -m B &&
 363
 364        git checkout B^0 &&
 365        test_must_fail git merge C &&
 366        git clean -f &&
 367        rm -rf a/ &&
 368        echo 5 >a &&
 369        git add a &&
 370        test_tick &&
 371        git commit -m D &&
 372        git tag D &&
 373
 374        git checkout C^0 &&
 375        test_must_fail git merge B &&
 376        git clean -f &&
 377        git rm --cached a &&
 378        echo 10 >a/file &&
 379        git add a/file &&
 380        test_tick &&
 381        git commit -m E1 &&
 382        git tag E1 &&
 383
 384        git checkout C^0 &&
 385        test_must_fail git merge B &&
 386        git clean -f &&
 387        git rm --cached a &&
 388        printf "10\n11\n" >a/file &&
 389        git add a/file &&
 390        test_tick &&
 391        git commit -m E2 &&
 392        git tag E2
 393'
 394
 395test_expect_success 'merge of D & E1 fails but has appropriate contents' '
 396        get_clean_checkout D^0 &&
 397
 398        test_must_fail git merge -s recursive E1^0 &&
 399
 400        test 2 -eq $(git ls-files -s | wc -l) &&
 401        test 1 -eq $(git ls-files -u | wc -l) &&
 402        test 0 -eq $(git ls-files -o | wc -l) &&
 403
 404        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 405        test $(git rev-parse :2:a) = $(git rev-parse B:a)
 406'
 407
 408test_expect_success 'merge of E1 & D fails but has appropriate contents' '
 409        get_clean_checkout E1^0 &&
 410
 411        test_must_fail git merge -s recursive D^0 &&
 412
 413        test 2 -eq $(git ls-files -s | wc -l) &&
 414        test 1 -eq $(git ls-files -u | wc -l) &&
 415        test 0 -eq $(git ls-files -o | wc -l) &&
 416
 417        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 418        test $(git rev-parse :3:a) = $(git rev-parse B:a)
 419'
 420
 421test_expect_success 'merge of D & E2 fails but has appropriate contents' '
 422        get_clean_checkout D^0 &&
 423
 424        test_must_fail git merge -s recursive E2^0 &&
 425
 426        test 4 -eq $(git ls-files -s | wc -l) &&
 427        test 3 -eq $(git ls-files -u | wc -l) &&
 428        test 1 -eq $(git ls-files -o | wc -l) &&
 429
 430        test $(git rev-parse :2:a) = $(git rev-parse B:a) &&
 431        test $(git rev-parse :3:a/file) = $(git rev-parse E2:a/file) &&
 432        test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 433        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 434
 435        test -f a~HEAD
 436'
 437
 438test_expect_success 'merge of E2 & D fails but has appropriate contents' '
 439        get_clean_checkout E2^0 &&
 440
 441        test_must_fail git merge -s recursive D^0 &&
 442
 443        test 4 -eq $(git ls-files -s | wc -l) &&
 444        test 3 -eq $(git ls-files -u | wc -l) &&
 445        test 1 -eq $(git ls-files -o | wc -l) &&
 446
 447        test $(git rev-parse :3:a) = $(git rev-parse B:a) &&
 448        test $(git rev-parse :2:a/file) = $(git rev-parse E2:a/file) &&
 449        test $(git rev-parse :1:a/file) = $(git rev-parse C:a/file) &&
 450        test $(git rev-parse :0:ignore-me) = $(git rev-parse A:ignore-me) &&
 451
 452        test -f a~D^0
 453'
 454
 455#
 456# criss-cross with rename/rename(1to2)/modify followed by
 457# rename/rename(2to1)/modify:
 458#
 459#      B   D
 460#      o---o
 461#     / \ / \
 462#  A o   X   ? F
 463#     \ / \ /
 464#      o---o
 465#      C   E
 466#
 467#   Commit A: new file: a
 468#   Commit B: rename a->b, modifying by adding a line
 469#   Commit C: rename a->c
 470#   Commit D: merge B&C, resolving conflict by keeping contents in newname
 471#   Commit E: merge B&C, resolving conflict similar to D but adding another line
 472#
 473# There is a conflict merging B & C, but one of filename not of file
 474# content.  Whoever created D and E chose specific resolutions for that
 475# conflict resolution.  Now, since: (1) there is no content conflict
 476# merging B & C, (2) D does not modify that merged content further, and (3)
 477# both D & E resolve the name conflict in the same way, the modification to
 478# newname in E should not cause any conflicts when it is merged with D.
 479# (Note that this can be accomplished by having the virtual merge base have
 480# the merged contents of b and c stored in a file named a, which seems like
 481# the most logical choice anyway.)
 482#
 483# Comment from Junio: I do not necessarily agree with the choice "a", but
 484# it feels sound to say "B and C do not agree what the final pathname
 485# should be, but we know this content was derived from the common A:a so we
 486# use one path whose name is arbitrary in the virtual merge base X between
 487# D and E" and then further let the rename detection to notice that that
 488# arbitrary path gets renamed between X-D to "newname" and X-E also to
 489# "newname" to resolve it as both sides renaming it to the same new
 490# name. It is akin to what we do at the content level, i.e. "B and C do not
 491# agree what the final contents should be, so we leave the conflict marker
 492# but that may cancel out at the final merge stage".
 493
 494test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 495        git reset --hard &&
 496        git rm -rf . &&
 497        git clean -fdqx &&
 498        rm -rf .git &&
 499        git init &&
 500
 501        printf "1\n2\n3\n4\n5\n6\n" >a &&
 502        git add a &&
 503        git commit -m A &&
 504        git tag A &&
 505
 506        git checkout -b B A &&
 507        git mv a b &&
 508        echo 7 >>b &&
 509        git add -u &&
 510        git commit -m B &&
 511
 512        git checkout -b C A &&
 513        git mv a c &&
 514        git commit -m C &&
 515
 516        git checkout -q B^0 &&
 517        git merge --no-commit -s ours C^0 &&
 518        git mv b newname &&
 519        git commit -m "Merge commit C^0 into HEAD" &&
 520        git tag D &&
 521
 522        git checkout -q C^0 &&
 523        git merge --no-commit -s ours B^0 &&
 524        git mv c newname &&
 525        printf "7\n8\n" >>newname &&
 526        git add -u &&
 527        git commit -m "Merge commit B^0 into HEAD" &&
 528        git tag E
 529'
 530
 531test_expect_success 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
 532        git checkout D^0 &&
 533
 534        git merge -s recursive E^0 &&
 535
 536        test 1 -eq $(git ls-files -s | wc -l) &&
 537        test 0 -eq $(git ls-files -u | wc -l) &&
 538        test 0 -eq $(git ls-files -o | wc -l) &&
 539
 540        test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
 541'
 542
 543#
 544# criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
 545#
 546#      B   D
 547#      o---o
 548#     / \ / \
 549#  A o   X   ? F
 550#     \ / \ /
 551#      o---o
 552#      C   E
 553#
 554#   Commit A: new file: a
 555#   Commit B: rename a->b
 556#   Commit C: rename a->c, add different a
 557#   Commit D: merge B&C, keeping b&c and (new) a modified at beginning
 558#   Commit E: merge B&C, keeping b&c and (new) a modified at end
 559#
 560# Merging commits D & E should result in no conflict; doing so correctly
 561# requires getting the virtual merge base (from merging B&C) right, handling
 562# renaming carefully (both in the virtual merge base and later), and getting
 563# content merge handled.
 564
 565test_expect_success 'setup criss-cross + rename/rename/add + modify/modify' '
 566        git rm -rf . &&
 567        git clean -fdqx &&
 568        rm -rf .git &&
 569        git init &&
 570
 571        printf "lots\nof\nwords\nand\ncontent\n" >a &&
 572        git add a &&
 573        git commit -m A &&
 574        git tag A &&
 575
 576        git checkout -b B A &&
 577        git mv a b &&
 578        git commit -m B &&
 579
 580        git checkout -b C A &&
 581        git mv a c &&
 582        printf "2\n3\n4\n5\n6\n7\n" >a &&
 583        git add a &&
 584        git commit -m C &&
 585
 586        git checkout B^0 &&
 587        git merge --no-commit -s ours C^0 &&
 588        git checkout C -- a c &&
 589        mv a old_a &&
 590        echo 1 >a &&
 591        cat old_a >>a &&
 592        rm old_a &&
 593        git add -u &&
 594        git commit -m "Merge commit C^0 into HEAD" &&
 595        git tag D &&
 596
 597        git checkout C^0 &&
 598        git merge --no-commit -s ours B^0 &&
 599        git checkout B -- b &&
 600        echo 8 >>a &&
 601        git add -u &&
 602        git commit -m "Merge commit B^0 into HEAD" &&
 603        git tag E
 604'
 605
 606test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
 607        git checkout D^0 &&
 608
 609        git merge -s recursive E^0 &&
 610
 611        test 3 -eq $(git ls-files -s | wc -l) &&
 612        test 0 -eq $(git ls-files -u | wc -l) &&
 613        test 0 -eq $(git ls-files -o | wc -l) &&
 614
 615        test $(git rev-parse HEAD:b) = $(git rev-parse A:a) &&
 616        test $(git rev-parse HEAD:c) = $(git rev-parse A:a) &&
 617        test "$(cat a)" = "$(printf "1\n2\n3\n4\n5\n6\n7\n8\n")"
 618'
 619
 620#
 621# criss-cross with rename/rename(1to2)/add-dest + simple modify:
 622#
 623#      B   D
 624#      o---o
 625#     / \ / \
 626#  A o   X   ? F
 627#     \ / \ /
 628#      o---o
 629#      C   E
 630#
 631#   Commit A: new file: a
 632#   Commit B: rename a->b, add c
 633#   Commit C: rename a->c
 634#   Commit D: merge B&C, keeping A:a and B:c
 635#   Commit E: merge B&C, keeping A:a and slightly modified c from B
 636#
 637# Merging commits D & E should result in no conflict.  The virtual merge
 638# base of B & C needs to not delete B:c for that to work, though...
 639
 640test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
 641        git rm -rf . &&
 642        git clean -fdqx &&
 643        rm -rf .git &&
 644        git init &&
 645
 646        >a &&
 647        git add a &&
 648        git commit -m A &&
 649        git tag A &&
 650
 651        git checkout -b B A &&
 652        git mv a b &&
 653        printf "1\n2\n3\n4\n5\n6\n7\n" >c &&
 654        git add c &&
 655        git commit -m B &&
 656
 657        git checkout -b C A &&
 658        git mv a c &&
 659        git commit -m C &&
 660
 661        git checkout B^0 &&
 662        git merge --no-commit -s ours C^0 &&
 663        git mv b a &&
 664        git commit -m "D is like B but renames b back to a" &&
 665        git tag D &&
 666
 667        git checkout B^0 &&
 668        git merge --no-commit -s ours C^0 &&
 669        git mv b a &&
 670        echo 8 >>c &&
 671        git add c &&
 672        git commit -m "E like D but has mod in c" &&
 673        git tag E
 674'
 675
 676test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
 677        git checkout D^0 &&
 678
 679        git merge -s recursive E^0 &&
 680
 681        test 2 -eq $(git ls-files -s | wc -l) &&
 682        test 0 -eq $(git ls-files -u | wc -l) &&
 683        test 0 -eq $(git ls-files -o | wc -l) &&
 684
 685        test $(git rev-parse HEAD:a) = $(git rev-parse A:a) &&
 686        test $(git rev-parse HEAD:c) = $(git rev-parse E:c)
 687'
 688
 689test_done