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 . ../lib-read-tree-m-3way.sh
  76
  77 ################################################################
  78 # Trivial "majority when 3 stages exist" merge plus #2ALT, #3ALT
  79 # and #5ALT trivial merges.
  80
  81 cat >expected <<\EOF
  82 100644 X 2      AA
  83 100644 X 3      AA
  84 100644 X 0      AN
  85 100644 X 1      DD
  86 100644 X 3      DF
  87 100644 X 2      DF/DF
  88 100644 X 1      DM
  89 100644 X 3      DM
  90 100644 X 1      DN
  91 100644 X 3      DN
  92 100644 X 0      LL
  93 100644 X 1      MD
  94 100644 X 2      MD
  95 100644 X 1      MM
  96 100644 X 2      MM
  97 100644 X 3      MM
  98 100644 X 0      MN
  99 100644 X 0      NA
 100 100644 X 1      ND
 101 100644 X 2      ND
 102 100644 X 0      NM
 103 100644 X 0      NN
 104 100644 X 0      SS
 105 100644 X 1      TT
 106 100644 X 2      TT
 107 100644 X 3      TT
 108 100644 X 2      Z/AA
 109 100644 X 3      Z/AA
 110 100644 X 0      Z/AN
 111 100644 X 1      Z/DD
 112 100644 X 1      Z/DM
 113 100644 X 3      Z/DM
 114 100644 X 1      Z/DN
 115 100644 X 3      Z/DN
 116 100644 X 1      Z/MD
 117 100644 X 2      Z/MD
 118 100644 X 1      Z/MM
 119 100644 X 2      Z/MM
 120 100644 X 3      Z/MM
 121 100644 X 0      Z/MN
 122 100644 X 0      Z/NA
 123 100644 X 1      Z/ND
 124 100644 X 2      Z/ND
 125 100644 X 0      Z/NM
 126 100644 X 0      Z/NN
 127 EOF
 128
 129 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 130 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
 131
 132 check_result () {
 133     git-ls-files --stage | sed -e 's/ '"$_x40"' / X /' >current &&
 134     diff -u expected current
 135 }
 136
 137 # This is done on an empty work directory, which is the normal
 138 # merge person behaviour.
 139 test_expect_success \
 140     '3-way merge with git-read-tree -m, empty cache' \
 141     "rm -fr [NDMALTS][NDMALTSF] Z &&
 142      rm .git/index &&
 143      git-read-tree -m $tree_O $tree_A $tree_B &&
 144      check_result"
 145
 146 # This starts out with the first head, which is the normal
 147 # patch submitter behaviour.
 148 test_expect_success \
 149     '3-way merge with git-read-tree -m, match H' \
 150     "rm -fr [NDMALTS][NDMALTSF] Z &&
 151      rm .git/index &&
 152      git-read-tree $tree_A &&
 153      git-checkout-index -f -u -a &&
 154      git-read-tree -m $tree_O $tree_A $tree_B &&
 155      check_result"
 156
 157 : <<\END_OF_CASE_TABLE
 158
 159 We have so far tested only empty index and clean-and-matching-A index
 160 case which are trivial.  Make sure index requirements are also
 161 checked.  The table also lists alternative semantics which is not
 162 currently implemented.
 163
 164 "git-diff-tree -m O A B"
 165
 166      O       A       B         result      index requirements
 167 -------------------------------------------------------------------
 168   1  missing missing missing   -           must not exist.
 169  ------------------------------------------------------------------
 170   2  missing missing exists    no merge    must not exist.
 171                                ------------------------------------
 172     (ALT)                      take B*     must match B, if exists.
 173  ------------------------------------------------------------------
 174   3  missing exists  missing   no merge    must match A and be
 175                                            up-to-date, if exists.
 176                                ------------------------------------
 177     (ALT)                      take A*     must match A, if exists.
 178  ------------------------------------------------------------------
 179   4  missing exists  A!=B      no merge    must match A and be
 180                                            up-to-date, if exists.
 181  ------------------------------------------------------------------
 182   5  missing exists  A==B      no merge    must match A and be
 183                                            up-to-date, if exists.
 184                                ------------------------------------
 185     (ALT)                      take A      must match A, if exists.
 186  ------------------------------------------------------------------
 187   6  exists  missing missing   no merge    must not exist.
 188                                ------------------------------------
 189     (ALT)                      remove      must not exist.
 190  ------------------------------------------------------------------
 191   7  exists  missing O!=B      no merge    must not exist.
 192  ------------------------------------------------------------------
 193   8  exists  missing O==B      no merge    must not exist.
 194                                ------------------------------------
 195     (ALT)                      remove      must not exist.
 196  ------------------------------------------------------------------
 197   9  exists  O!=A    missing   no merge    must match A and be
 198                                            up-to-date, if exists.
 199  ------------------------------------------------------------------
 200  10  exists  O==A    missing   no merge    must match A and be
 201                                            up-to-date, if exists.
 202                                ------------------------------------
 203     (ALT)                      remove      ditto
 204  ------------------------------------------------------------------
 205  11  exists  O!=A    O!=B      no merge    must match A and be
 206                      A!=B                  up-to-date, if exists.
 207  ------------------------------------------------------------------
 208  12  exists  O!=A    O!=B      take A      must match A, if exists.
 209                      A==B
 210  ------------------------------------------------------------------
 211  13  exists  O!=A    O==B      take A      must match A, if exists.
 212  ------------------------------------------------------------------
 213  14  exists  O==A    O!=B      take B      must match A and be
 214                                            be up-to-date, if exists.
 215                                ------------------------------------
 216     (ALT)                      take B      if exists, must either (1)
 217                                            match A and be up-to-date,
 218                                            or (2) match B.
 219  ------------------------------------------------------------------
 220  15  exists  O==A    O==B      take B      must match A if exists.
 221 -------------------------------------------------------------------
 222
 223 Note: if we want to implement 2ALT and 3ALT we need to be careful.
 224 The tree A may contain DF (file) when tree B require DF to be a
 225 directory by having DF/DF (file).
 226
 227 END_OF_CASE_TABLE
 228
 229 test_expect_failure \
 230     '1 - must not have an entry not in A.' \
 231     "rm -f .git/index XX &&
 232      echo XX >XX &&
 233      git-update-index --add XX &&
 234      git-read-tree -m $tree_O $tree_A $tree_B"
 235
 236 test_expect_success \
 237     '2 - must match B in !O && !A && B case.' \
 238     "rm -f .git/index NA &&
 239      cp .orig-B/NA NA &&
 240      git-update-index --add NA &&
 241      git-read-tree -m $tree_O $tree_A $tree_B"
 242
 243 test_expect_success \
 244     '2 - matching B alone is OK in !O && !A && B case.' \
 245     "rm -f .git/index NA &&
 246      cp .orig-B/NA NA &&
 247      git-update-index --add NA &&
 248      echo extra >>NA &&
 249      git-read-tree -m $tree_O $tree_A $tree_B"
 250
 251 test_expect_success \
 252     '3 - must match A in !O && A && !B case.' \
 253     "rm -f .git/index AN &&
 254      cp .orig-A/AN AN &&
 255      git-update-index --add AN &&
 256      git-read-tree -m $tree_O $tree_A $tree_B &&
 257      check_result"
 258
 259 test_expect_success \
 260     '3 - matching A alone is OK in !O && A && !B case.' \
 261     "rm -f .git/index AN &&
 262      cp .orig-A/AN AN &&
 263      git-update-index --add AN &&
 264      echo extra >>AN &&
 265      git-read-tree -m $tree_O $tree_A $tree_B"
 266
 267 test_expect_failure \
 268     '3 (fail) - must match A in !O && A && !B case.' \
 269     "rm -f .git/index AN &&
 270      cp .orig-A/AN AN &&
 271      echo extra >>AN &&
 272      git-update-index --add AN &&
 273      git-read-tree -m $tree_O $tree_A $tree_B"
 274
 275 test_expect_success \
 276     '4 - 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      git-update-index --add AA &&
 280      git-read-tree -m $tree_O $tree_A $tree_B &&
 281      check_result"
 282
 283 test_expect_failure \
 284     '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' \
 285     "rm -f .git/index AA &&
 286      cp .orig-A/AA AA &&
 287      git-update-index --add AA &&
 288      echo extra >>AA &&
 289      git-read-tree -m $tree_O $tree_A $tree_B"
 290
 291 test_expect_failure \
 292     '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' \
 293     "rm -f .git/index AA &&
 294      cp .orig-A/AA AA &&
 295      echo extra >>AA &&
 296      git-update-index --add AA &&
 297      git-read-tree -m $tree_O $tree_A $tree_B"
 298
 299 test_expect_success \
 300     '5 - must match in !O && A && B && A==B case.' \
 301     "rm -f .git/index LL &&
 302      cp .orig-A/LL LL &&
 303      git-update-index --add LL &&
 304      git-read-tree -m $tree_O $tree_A $tree_B &&
 305      check_result"
 306
 307 test_expect_success \
 308     '5 - must match in !O && A && B && A==B case.' \
 309     "rm -f .git/index LL &&
 310      cp .orig-A/LL LL &&
 311      git-update-index --add LL &&
 312      echo extra >>LL &&
 313      git-read-tree -m $tree_O $tree_A $tree_B &&
 314      check_result"
 315
 316 test_expect_failure \
 317     '5 (fail) - must match A in !O && A && B && A==B case.' \
 318     "rm -f .git/index LL &&
 319      cp .orig-A/LL LL &&
 320      echo extra >>LL &&
 321      git-update-index --add LL &&
 322      git-read-tree -m $tree_O $tree_A $tree_B"
 323
 324 test_expect_failure \
 325     '6 - must not exist in O && !A && !B case' \
 326     "rm -f .git/index DD &&
 327      echo DD >DD
 328      git-update-index --add DD &&
 329      git-read-tree -m $tree_O $tree_A $tree_B"
 330
 331 test_expect_failure \
 332     '7 - must not exist in O && !A && B && O!=B case' \
 333     "rm -f .git/index DM &&
 334      cp .orig-B/DM DM &&
 335      git-update-index --add DM &&
 336      git-read-tree -m $tree_O $tree_A $tree_B"
 337
 338 test_expect_failure \
 339     '8 - must not exist in O && !A && B && O==B case' \
 340     "rm -f .git/index DN &&
 341      cp .orig-B/DN DN &&
 342      git-update-index --add DN &&
 343      git-read-tree -m $tree_O $tree_A $tree_B"
 344
 345 test_expect_success \
 346     '9 - must match and be up-to-date in O && A && !B && O!=A case' \
 347     "rm -f .git/index MD &&
 348      cp .orig-A/MD MD &&
 349      git-update-index --add MD &&
 350      git-read-tree -m $tree_O $tree_A $tree_B &&
 351      check_result"
 352
 353 test_expect_failure \
 354     '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' \
 355     "rm -f .git/index MD &&
 356      cp .orig-A/MD MD &&
 357      git-update-index --add MD &&
 358      echo extra >>MD &&
 359      git-read-tree -m $tree_O $tree_A $tree_B"
 360
 361 test_expect_failure \
 362     '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' \
 363     "rm -f .git/index MD &&
 364      cp .orig-A/MD MD &&
 365      echo extra >>MD &&
 366      git-update-index --add MD &&
 367      git-read-tree -m $tree_O $tree_A $tree_B"
 368
 369 test_expect_success \
 370     '10 - must match and be up-to-date in O && A && !B && O==A case' \
 371     "rm -f .git/index ND &&
 372      cp .orig-A/ND ND &&
 373      git-update-index --add ND &&
 374      git-read-tree -m $tree_O $tree_A $tree_B &&
 375      check_result"
 376
 377 test_expect_failure \
 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      git-update-index --add ND &&
 382      echo extra >>ND &&
 383      git-read-tree -m $tree_O $tree_A $tree_B"
 384
 385 test_expect_failure \
 386     '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' \
 387     "rm -f .git/index ND &&
 388      cp .orig-A/ND ND &&
 389      echo extra >>ND &&
 390      git-update-index --add ND &&
 391      git-read-tree -m $tree_O $tree_A $tree_B"
 392
 393 test_expect_success \
 394     '11 - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' \
 395     "rm -f .git/index MM &&
 396      cp .orig-A/MM MM &&
 397      git-update-index --add MM &&
 398      git-read-tree -m $tree_O $tree_A $tree_B &&
 399      check_result"
 400
 401 test_expect_failure \
 402     '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' \
 403     "rm -f .git/index MM &&
 404      cp .orig-A/MM MM &&
 405      git-update-index --add MM &&
 406      echo extra >>MM &&
 407      git-read-tree -m $tree_O $tree_A $tree_B"
 408
 409 test_expect_failure \
 410     '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' \
 411     "rm -f .git/index MM &&
 412      cp .orig-A/MM MM &&
 413      echo extra >>MM &&
 414      git-update-index --add MM &&
 415      git-read-tree -m $tree_O $tree_A $tree_B"
 416
 417 test_expect_success \
 418     '12 - must match A in O && A && B && O!=A && A==B case' \
 419     "rm -f .git/index SS &&
 420      cp .orig-A/SS SS &&
 421      git-update-index --add SS &&
 422      git-read-tree -m $tree_O $tree_A $tree_B &&
 423      check_result"
 424
 425 test_expect_success \
 426     '12 - must match A in O && A && B && O!=A && A==B case' \
 427     "rm -f .git/index SS &&
 428      cp .orig-A/SS SS &&
 429      git-update-index --add SS &&
 430      echo extra >>SS &&
 431      git-read-tree -m $tree_O $tree_A $tree_B &&
 432      check_result"
 433
 434 test_expect_failure \
 435     '12 (fail) - must match A in O && A && B && O!=A && A==B case' \
 436     "rm -f .git/index SS &&
 437      cp .orig-A/SS SS &&
 438      echo extra >>SS &&
 439      git-update-index --add SS &&
 440      git-read-tree -m $tree_O $tree_A $tree_B"
 441
 442 test_expect_success \
 443     '13 - must match A in O && A && B && O!=A && O==B case' \
 444     "rm -f .git/index MN &&
 445      cp .orig-A/MN MN &&
 446      git-update-index --add MN &&
 447      git-read-tree -m $tree_O $tree_A $tree_B &&
 448      check_result"
 449
 450 test_expect_success \
 451     '13 - must match A in O && A && B && O!=A && O==B case' \
 452     "rm -f .git/index MN &&
 453      cp .orig-A/MN MN &&
 454      git-update-index --add MN &&
 455      echo extra >>MN &&
 456      git-read-tree -m $tree_O $tree_A $tree_B &&
 457      check_result"
 458
 459 test_expect_success \
 460     '14 - must match and be up-to-date in O && A && B && O==A && O!=B case' \
 461     "rm -f .git/index NM &&
 462      cp .orig-A/NM NM &&
 463      git-update-index --add NM &&
 464      git-read-tree -m $tree_O $tree_A $tree_B &&
 465      check_result"
 466
 467 test_expect_success \
 468     '14 - may match B in O && A && B && O==A && O!=B case' \
 469     "rm -f .git/index NM &&
 470      cp .orig-B/NM NM &&
 471      git-update-index --add NM &&
 472      echo extra >>NM &&
 473      git-read-tree -m $tree_O $tree_A $tree_B &&
 474      check_result"
 475
 476 test_expect_failure \
 477     '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' \
 478     "rm -f .git/index NM &&
 479      cp .orig-A/NM NM &&
 480      git-update-index --add NM &&
 481      echo extra >>NM &&
 482      git-read-tree -m $tree_O $tree_A $tree_B"
 483
 484 test_expect_failure \
 485     '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' \
 486     "rm -f .git/index NM &&
 487      cp .orig-A/NM NM &&
 488      echo extra >>NM &&
 489      git-update-index --add NM &&
 490      git-read-tree -m $tree_O $tree_A $tree_B"
 491
 492 test_expect_success \
 493     '15 - must match A in O && A && B && O==A && O==B case' \
 494     "rm -f .git/index NN &&
 495      cp .orig-A/NN NN &&
 496      git-update-index --add NN &&
 497      git-read-tree -m $tree_O $tree_A $tree_B &&
 498      check_result"
 499
 500 test_expect_success \
 501     '15 - must match A in O && A && B && O==A && O==B case' \
 502     "rm -f .git/index NN &&
 503      cp .orig-A/NN NN &&
 504      git-update-index --add NN &&
 505      echo extra >>NN &&
 506      git-read-tree -m $tree_O $tree_A $tree_B &&
 507      check_result"
 508
 509 test_expect_failure \
 510     '15 (fail) - must match A in O && A && B && O==A && O==B case' \
 511     "rm -f .git/index NN &&
 512      cp .orig-A/NN NN &&
 513      echo extra >>NN &&
 514      git-update-index --add NN &&
 515      git-read-tree -m $tree_O $tree_A $tree_B"
 516
 517 test_done