t/t1000-read-tree-m-3way.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5
   6 test_description='Three way merge with read-tree -m
   7
   8 This test tries three-way merge with read-tree -m
   9
  10 There is one ancestor (called O for Original) and two branches A
  11 and B derived from it.  We want to do a 3-way merge between A and
  12 B, using O as the common ancestor.
  13
  14     merge A O B
  15
  16 Decisions are made by comparing contents of O, A and B pathname
  17 by pathname.  The result is determined by the following guiding
  18 principle:
  19
  20  - If only A does something to it and B does not touch it, take
  21    whatever A does.
  22
  23  - If only B does something to it and A does not touch it, take
  24    whatever B does.
  25
  26  - If both A and B does something but in the same way, take
  27    whatever they do.
  28
  29  - If A and B does something but different things, we need a
  30    3-way merge:
  31
  32    - We cannot do anything about the following cases:
  33
  34      * O does not have it.  A and B both must be adding to the
  35        same path independently.
  36
  37      * A deletes it.  B must be modifying.
  38
  39    - Otherwise, A and B are modifying.  Run 3-way merge.
  40
  41 First, the case matrix.
  42
  43  - Vertical axis is for A'\''s actions.
  44  - Horizontal axis is for B'\''s actions.
  45
  46 .----------------------------------------------------------------.
  47 | A        B | No Action  |   Delete   |   Modify   |    Add     |
  48 |------------+------------+------------+------------+------------|
  49 | No Action  |            |            |            |            |
  50 |            | select O   | delete     | select B   | select B   |
  51 |            |            |            |            |            |
  52 |------------+------------+------------+------------+------------|
  53 | Delete     |            |            | ********** |    can     |
  54 |            | delete     | delete     | merge      |    not     |
  55 |            |            |            |            |  happen    |
  56 |------------+------------+------------+------------+------------|
  57 | Modify     |            | ********** | ?????????? |    can     |
  58 |            | select A   | merge      | select A=B |    not     |
  59 |            |            |            | merge      |  happen    |
  60 |------------+------------+------------+------------+------------|
  61 | Add        |            |    can     |    can     | ?????????? |
  62 |            | select A   |    not     |    not     | select A=B |
  63 |            |            |  happen    |  happen    | merge      |
  64 .----------------------------------------------------------------.
  65
  66 In addition:
  67
  68  SS: a special case of MM, where A and B makes the same modification.
  69  LL: a special case of AA, where A and B creates the same file.
  70  TT: a special case of MM, where A and B makes mergeable changes.
  71  DF: a special case, where A makes a directory and B makes a file.
  72
  73 '
  74 . ./test-lib.sh
  75 . "$TEST_DIRECTORY"/lib-read-tree.sh
  76 . "$TEST_DIRECTORY"/lib-read-tree-m-3way.sh
  77
  78 ################################################################
  79 # Trivial "majority when 3 stages exist" merge plus #2ALT, #3ALT
  80 # and #5ALT trivial merges.
  81
  82 cat >expected <<\EOF
  83 100644 X 2      AA
  84 100644 X 3      AA
  85 100644 X 0      AN
  86 100644 X 1      DD
  87 100644 X 3      DF
  88 100644 X 2      DF/DF
  89 100644 X 1      DM
  90 100644 X 3      DM
  91 100644 X 1      DN
  92 100644 X 3      DN
  93 100644 X 0      LL
  94 100644 X 1      MD
  95 100644 X 2      MD
  96 100644 X 1      MM
  97 100644 X 2      MM
  98 100644 X 3      MM
  99 100644 X 0      MN
 100 100644 X 0      NA
 101 100644 X 1      ND
 102 100644 X 2      ND
 103 100644 X 0      NM
 104 100644 X 0      NN
 105 100644 X 0      SS
 106 100644 X 1      TT
 107 100644 X 2      TT
 108 100644 X 3      TT
 109 100644 X 2      Z/AA
 110 100644 X 3      Z/AA
 111 100644 X 0      Z/AN
 112 100644 X 1      Z/DD
 113 100644 X 1      Z/DM
 114 100644 X 3      Z/DM
 115 100644 X 1      Z/DN
 116 100644 X 3      Z/DN
 117 100644 X 1      Z/MD
 118 100644 X 2      Z/MD
 119 100644 X 1      Z/MM
 120 100644 X 2      Z/MM
 121 100644 X 3      Z/MM
 122 100644 X 0      Z/MN
 123 100644 X 0      Z/NA
 124 100644 X 1      Z/ND
 125 100644 X 2      Z/ND
 126 100644 X 0      Z/NM
 127 100644 X 0      Z/NN
 128 EOF
 129
 130 check_result () {
 131     git ls-files --stage | sed -e 's/ '"$_x40"' / X /' >current &&
 132     test_cmp expected current
 133 }
 134
 135 # This is done on an empty work directory, which is the normal
 136 # merge person behaviour.
 137 test_expect_success \
 138     '3-way merge with git read-tree -m, empty cache' \
 139     "rm -fr [NDMALTS][NDMALTSF] Z &&
 140      rm .git/index &&
 141      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 142      check_result"
 143
 144 # This starts out with the first head, which is the normal
 145 # patch submitter behaviour.
 146 test_expect_success \
 147     '3-way merge with git read-tree -m, match H' \
 148     "rm -fr [NDMALTS][NDMALTSF] Z &&
 149      rm .git/index &&
 150      read_tree_must_succeed $tree_A &&
 151      git checkout-index -f -u -a &&
 152      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 153      check_result"
 154
 155 : <<\END_OF_CASE_TABLE
 156
 157 We have so far tested only empty index and clean-and-matching-A index
 158 case which are trivial.  Make sure index requirements are also
 159 checked.
 160
 161 "git read-tree -m O A B"
 162
 163      O       A       B         result      index requirements
 164 -------------------------------------------------------------------
 165   1  missing missing missing   -           must not exist.
 166  ------------------------------------------------------------------
 167   2  missing missing exists    take B*     must match B, if exists.
 168  ------------------------------------------------------------------
 169   3  missing exists  missing   take A*     must match A, if exists.
 170  ------------------------------------------------------------------
 171   4  missing exists  A!=B      no merge    must match A and be
 172                                            up-to-date, if exists.
 173  ------------------------------------------------------------------
 174   5  missing exists  A==B      take A      must match A, if exists.
 175  ------------------------------------------------------------------
 176   6  exists  missing missing   remove      must not exist.
 177  ------------------------------------------------------------------
 178   7  exists  missing O!=B      no merge    must not exist.
 179  ------------------------------------------------------------------
 180   8  exists  missing O==B      remove      must not exist.
 181  ------------------------------------------------------------------
 182   9  exists  O!=A    missing   no merge    must match A and be
 183                                            up-to-date, if exists.
 184  ------------------------------------------------------------------
 185  10  exists  O==A    missing   no merge    must match A
 186  ------------------------------------------------------------------
 187  11  exists  O!=A    O!=B      no merge    must match A and be
 188                      A!=B                  up-to-date, if exists.
 189  ------------------------------------------------------------------
 190  12  exists  O!=A    O!=B      take A      must match A, if exists.
 191                      A==B
 192  ------------------------------------------------------------------
 193  13  exists  O!=A    O==B      take A      must match A, if exists.
 194  ------------------------------------------------------------------
 195  14  exists  O==A    O!=B      take B      if exists, must either (1)
 196                                            match A and be up-to-date,
 197                                            or (2) match B.
 198  ------------------------------------------------------------------
 199  15  exists  O==A    O==B      take B      must match A if exists.
 200  ------------------------------------------------------------------
 201  16  exists  O==A    O==B      barf        must match A if exists.
 202      *multi* in one  in another
 203 -------------------------------------------------------------------
 204
 205 Note: we need to be careful in case 2 and 3.  The tree A may contain
 206 DF (file) when tree B require DF to be a directory by having DF/DF
 207 (file).
 208
 209 END_OF_CASE_TABLE
 210
 211 test_expect_success '1 - must not have an entry not in A.' "
 212      rm -f .git/index XX &&
 213      echo XX >XX &&
 214      git update-index --add XX &&
 215      read_tree_must_fail -m $tree_O $tree_A $tree_B
 216 "
 217
 218 test_expect_success \
 219     '2 - must match B in !O && !A && B case.' \
 220     "rm -f .git/index NA &&
 221      cp .orig-B/NA NA &&
 222      git update-index --add NA &&
 223      read_tree_must_succeed -m $tree_O $tree_A $tree_B"
 224
 225 test_expect_success \
 226     '2 - matching B alone is OK in !O && !A && B case.' \
 227     "rm -f .git/index NA &&
 228      cp .orig-B/NA NA &&
 229      git update-index --add NA &&
 230      echo extra >>NA &&
 231      read_tree_must_succeed -m $tree_O $tree_A $tree_B"
 232
 233 test_expect_success \
 234     '3 - must match A in !O && A && !B case.' \
 235     "rm -f .git/index AN &&
 236      cp .orig-A/AN AN &&
 237      git update-index --add AN &&
 238      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 239      check_result"
 240
 241 test_expect_success \
 242     '3 - matching A alone is OK in !O && A && !B case.' \
 243     "rm -f .git/index AN &&
 244      cp .orig-A/AN AN &&
 245      git update-index --add AN &&
 246      echo extra >>AN &&
 247      read_tree_must_succeed -m $tree_O $tree_A $tree_B"
 248
 249 test_expect_success \
 250     '3 (fail) - must match A in !O && A && !B case.' "
 251      rm -f .git/index AN &&
 252      cp .orig-A/AN AN &&
 253      echo extra >>AN &&
 254      git update-index --add AN &&
 255      read_tree_must_fail -m $tree_O $tree_A $tree_B
 256 "
 257
 258 test_expect_success \
 259     '4 - must match and be up-to-date in !O && A && B && A!=B case.' \
 260     "rm -f .git/index AA &&
 261      cp .orig-A/AA AA &&
 262      git update-index --add AA &&
 263      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 264      check_result"
 265
 266 test_expect_success \
 267     '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' "
 268      rm -f .git/index AA &&
 269      cp .orig-A/AA AA &&
 270      git update-index --add AA &&
 271      echo extra >>AA &&
 272      read_tree_must_fail -m $tree_O $tree_A $tree_B
 273 "
 274
 275 test_expect_success \
 276     '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' "
 277      rm -f .git/index AA &&
 278      cp .orig-A/AA AA &&
 279      echo extra >>AA &&
 280      git update-index --add AA &&
 281      read_tree_must_fail -m $tree_O $tree_A $tree_B
 282 "
 283
 284 test_expect_success \
 285     '5 - must match in !O && A && B && A==B case.' \
 286     "rm -f .git/index LL &&
 287      cp .orig-A/LL LL &&
 288      git update-index --add LL &&
 289      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 290      check_result"
 291
 292 test_expect_success \
 293     '5 - must match in !O && A && B && A==B case.' \
 294     "rm -f .git/index LL &&
 295      cp .orig-A/LL LL &&
 296      git update-index --add LL &&
 297      echo extra >>LL &&
 298      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 299      check_result"
 300
 301 test_expect_success \
 302     '5 (fail) - must match A in !O && A && B && A==B case.' "
 303      rm -f .git/index LL &&
 304      cp .orig-A/LL LL &&
 305      echo extra >>LL &&
 306      git update-index --add LL &&
 307      read_tree_must_fail -m $tree_O $tree_A $tree_B
 308 "
 309
 310 test_expect_success \
 311     '6 - must not exist in O && !A && !B case' "
 312      rm -f .git/index DD &&
 313      echo DD >DD &&
 314      git update-index --add DD &&
 315      read_tree_must_fail -m $tree_O $tree_A $tree_B
 316 "
 317
 318 test_expect_success \
 319     '7 - must not exist in O && !A && B && O!=B case' "
 320      rm -f .git/index DM &&
 321      cp .orig-B/DM DM &&
 322      git update-index --add DM &&
 323      read_tree_must_fail -m $tree_O $tree_A $tree_B
 324 "
 325
 326 test_expect_success \
 327     '8 - must not exist in O && !A && B && O==B case' "
 328      rm -f .git/index DN &&
 329      cp .orig-B/DN DN &&
 330      git update-index --add DN &&
 331      read_tree_must_fail -m $tree_O $tree_A $tree_B
 332 "
 333
 334 test_expect_success \
 335     '9 - must match and be up-to-date in O && A && !B && O!=A case' \
 336     "rm -f .git/index MD &&
 337      cp .orig-A/MD MD &&
 338      git update-index --add MD &&
 339      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 340      check_result"
 341
 342 test_expect_success \
 343     '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' "
 344      rm -f .git/index MD &&
 345      cp .orig-A/MD MD &&
 346      git update-index --add MD &&
 347      echo extra >>MD &&
 348      read_tree_must_fail -m $tree_O $tree_A $tree_B
 349 "
 350
 351 test_expect_success \
 352     '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' "
 353      rm -f .git/index MD &&
 354      cp .orig-A/MD MD &&
 355      echo extra >>MD &&
 356      git update-index --add MD &&
 357      read_tree_must_fail -m $tree_O $tree_A $tree_B
 358 "
 359
 360 test_expect_success \
 361     '10 - must match and be up-to-date in O && A && !B && O==A case' \
 362     "rm -f .git/index ND &&
 363      cp .orig-A/ND ND &&
 364      git update-index --add ND &&
 365      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 366      check_result"
 367
 368 test_expect_success \
 369     '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' "
 370      rm -f .git/index ND &&
 371      cp .orig-A/ND ND &&
 372      git update-index --add ND &&
 373      echo extra >>ND &&
 374      read_tree_must_fail -m $tree_O $tree_A $tree_B
 375 "
 376
 377 test_expect_success \
 378     '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' "
 379      rm -f .git/index ND &&
 380      cp .orig-A/ND ND &&
 381      echo extra >>ND &&
 382      git update-index --add ND &&
 383      read_tree_must_fail -m $tree_O $tree_A $tree_B
 384 "
 385
 386 test_expect_success \
 387     '11 - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' \
 388     "rm -f .git/index MM &&
 389      cp .orig-A/MM MM &&
 390      git update-index --add MM &&
 391      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 392      check_result"
 393
 394 test_expect_success \
 395     '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' "
 396      rm -f .git/index MM &&
 397      cp .orig-A/MM MM &&
 398      git update-index --add MM &&
 399      echo extra >>MM &&
 400      read_tree_must_fail -m $tree_O $tree_A $tree_B
 401 "
 402
 403 test_expect_success \
 404     '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' "
 405      rm -f .git/index MM &&
 406      cp .orig-A/MM MM &&
 407      echo extra >>MM &&
 408      git update-index --add MM &&
 409      read_tree_must_fail -m $tree_O $tree_A $tree_B
 410 "
 411
 412 test_expect_success \
 413     '12 - must match A in O && A && B && O!=A && A==B case' \
 414     "rm -f .git/index SS &&
 415      cp .orig-A/SS SS &&
 416      git update-index --add SS &&
 417      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 418      check_result"
 419
 420 test_expect_success \
 421     '12 - must match A in O && A && B && O!=A && A==B case' \
 422     "rm -f .git/index SS &&
 423      cp .orig-A/SS SS &&
 424      git update-index --add SS &&
 425      echo extra >>SS &&
 426      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 427      check_result"
 428
 429 test_expect_success \
 430     '12 (fail) - must match A in O && A && B && O!=A && A==B case' "
 431      rm -f .git/index SS &&
 432      cp .orig-A/SS SS &&
 433      echo extra >>SS &&
 434      git update-index --add SS &&
 435      read_tree_must_fail -m $tree_O $tree_A $tree_B
 436 "
 437
 438 test_expect_success \
 439     '13 - must match A in O && A && B && O!=A && O==B case' \
 440     "rm -f .git/index MN &&
 441      cp .orig-A/MN MN &&
 442      git update-index --add MN &&
 443      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 444      check_result"
 445
 446 test_expect_success \
 447     '13 - must match A in O && A && B && O!=A && O==B case' \
 448     "rm -f .git/index MN &&
 449      cp .orig-A/MN MN &&
 450      git update-index --add MN &&
 451      echo extra >>MN &&
 452      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 453      check_result"
 454
 455 test_expect_success \
 456     '14 - must match and be up-to-date in O && A && B && O==A && O!=B case' \
 457     "rm -f .git/index NM &&
 458      cp .orig-A/NM NM &&
 459      git update-index --add NM &&
 460      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 461      check_result"
 462
 463 test_expect_success \
 464     '14 - may match B in O && A && B && O==A && O!=B case' \
 465     "rm -f .git/index NM &&
 466      cp .orig-B/NM NM &&
 467      git update-index --add NM &&
 468      echo extra >>NM &&
 469      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 470      check_result"
 471
 472 test_expect_success \
 473     '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' "
 474      rm -f .git/index NM &&
 475      cp .orig-A/NM NM &&
 476      git update-index --add NM &&
 477      echo extra >>NM &&
 478      read_tree_must_fail -m $tree_O $tree_A $tree_B
 479 "
 480
 481 test_expect_success \
 482     '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' "
 483      rm -f .git/index NM &&
 484      cp .orig-A/NM NM &&
 485      echo extra >>NM &&
 486      git update-index --add NM &&
 487      read_tree_must_fail -m $tree_O $tree_A $tree_B
 488 "
 489
 490 test_expect_success \
 491     '15 - must match A in O && A && B && O==A && O==B case' \
 492     "rm -f .git/index NN &&
 493      cp .orig-A/NN NN &&
 494      git update-index --add NN &&
 495      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 496      check_result"
 497
 498 test_expect_success \
 499     '15 - must match A in O && A && B && O==A && O==B case' \
 500     "rm -f .git/index NN &&
 501      cp .orig-A/NN NN &&
 502      git update-index --add NN &&
 503      echo extra >>NN &&
 504      read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
 505      check_result"
 506
 507 test_expect_success \
 508     '15 (fail) - must match A in O && A && B && O==A && O==B case' "
 509      rm -f .git/index NN &&
 510      cp .orig-A/NN NN &&
 511      echo extra >>NN &&
 512      git update-index --add NN &&
 513      read_tree_must_fail -m $tree_O $tree_A $tree_B
 514 "
 515
 516 # #16
 517 test_expect_success \
 518     '16 - A matches in one and B matches in another.' \
 519     'rm -f .git/index F16 &&
 520     echo F16 >F16 &&
 521     git update-index --add F16 &&
 522     tree0=`git write-tree` &&
 523     echo E16 >F16 &&
 524     git update-index F16 &&
 525     tree1=`git write-tree` &&
 526     read_tree_must_succeed -m $tree0 $tree1 $tree1 $tree0 &&
 527     git ls-files --stage'
 528
 529 test_done