3 # Copyright (c) 2005 Junio C Hamano
6 test_description='Three way merge with read-tree -m
8 This test tries three-way merge with read-tree -m
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.
16 Decisions are made by comparing contents of O, A and B pathname
17 by pathname. The result is determined by the following guiding
20 - If only A does something to it and B does not touch it, take
23 - If only B does something to it and A does not touch it, take
26 - If both A and B does something but in the same way, take
29 - If A and B does something but different things, we need a
32 - We cannot do anything about the following cases:
34 * O does not have it. A and B both must be adding to the
35 same path independently.
37 * A deletes it. B must be modifying.
39 - Otherwise, A and B are modifying. Run 3-way merge.
41 First, the case matrix.
43 - Vertical axis is for A'\''s actions.
44 - Horizontal axis is for B'\''s actions.
46 .----------------------------------------------------------------.
47 | A B | No Action | Delete | Modify | Add |
48 |------------+------------+------------+------------+------------|
50 | | select O | delete | select B | select B |
52 |------------+------------+------------+------------+------------|
53 | Delete | | | ********** | can |
54 | | delete | delete | merge | not |
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 .----------------------------------------------------------------.
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.
75 . ../lib-read-tree-m-3way.sh
77 ################################################################
78 # Trivial "majority when 3 stages exist" merge plus #2ALT, #3ALT
79 # and #5ALT trivial merges.
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"
133 git ls-files --stage | sed -e 's/ '"$_x40"' / X /' >current &&
134 git diff expected current
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 &&
143 git read-tree -m $tree_O $tree_A $tree_B &&
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 &&
152 git read-tree $tree_A &&
153 git checkout-index -f -u -a &&
154 git read-tree -m $tree_O $tree_A $tree_B &&
157 : <<\END_OF_CASE_TABLE
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
163 "git read-tree -m O A B"
165 O A B result index requirements
166 -------------------------------------------------------------------
167 1 missing missing missing - must not exist.
168 ------------------------------------------------------------------
169 2 missing missing exists take B* must match B, if exists.
170 ------------------------------------------------------------------
171 3 missing exists missing take A* must match A, if exists.
172 ------------------------------------------------------------------
173 4 missing exists A!=B no merge must match A and be
174 up-to-date, if exists.
175 ------------------------------------------------------------------
176 5 missing exists A==B take A must match A, if exists.
177 ------------------------------------------------------------------
178 6 exists missing missing remove must not exist.
179 ------------------------------------------------------------------
180 7 exists missing O!=B no merge must not exist.
181 ------------------------------------------------------------------
182 8 exists missing O==B remove must not exist.
183 ------------------------------------------------------------------
184 9 exists O!=A missing no merge must match A and be
185 up-to-date, if exists.
186 ------------------------------------------------------------------
187 10 exists O==A missing no merge must match A
188 ------------------------------------------------------------------
189 11 exists O!=A O!=B no merge must match A and be
190 A!=B up-to-date, if exists.
191 ------------------------------------------------------------------
192 12 exists O!=A O!=B take A must match A, if exists.
194 ------------------------------------------------------------------
195 13 exists O!=A O==B take A must match A, if exists.
196 ------------------------------------------------------------------
197 14 exists O==A O!=B take B if exists, must either (1)
198 match A and be up-to-date,
200 ------------------------------------------------------------------
201 15 exists O==A O==B take B must match A if exists.
202 ------------------------------------------------------------------
203 16 exists O==A O==B barf must match A if exists.
204 *multi* in one in another
205 -------------------------------------------------------------------
207 Note: we need to be careful in case 2 and 3. The tree A may contain
208 DF (file) when tree B require DF to be a directory by having DF/DF
213 test_expect_success '1 - must not have an entry not in A.' "
214 rm -f .git/index XX &&
216 git update-index --add XX &&
217 ! git read-tree -m $tree_O $tree_A $tree_B
220 test_expect_success \
221 '2 - must match B in !O && !A && B case.' \
222 "rm -f .git/index NA &&
224 git update-index --add NA &&
225 git read-tree -m $tree_O $tree_A $tree_B"
227 test_expect_success \
228 '2 - matching B alone is OK in !O && !A && B case.' \
229 "rm -f .git/index NA &&
231 git update-index --add NA &&
233 git read-tree -m $tree_O $tree_A $tree_B"
235 test_expect_success \
236 '3 - must match A in !O && A && !B case.' \
237 "rm -f .git/index AN &&
239 git update-index --add AN &&
240 git read-tree -m $tree_O $tree_A $tree_B &&
243 test_expect_success \
244 '3 - matching A alone is OK in !O && A && !B case.' \
245 "rm -f .git/index AN &&
247 git update-index --add AN &&
249 git read-tree -m $tree_O $tree_A $tree_B"
251 test_expect_success \
252 '3 (fail) - must match A in !O && A && !B case.' "
253 rm -f .git/index AN &&
256 git update-index --add AN &&
257 ! git read-tree -m $tree_O $tree_A $tree_B
260 test_expect_success \
261 '4 - must match and be up-to-date in !O && A && B && A!=B case.' \
262 "rm -f .git/index AA &&
264 git update-index --add AA &&
265 git read-tree -m $tree_O $tree_A $tree_B &&
268 test_expect_success \
269 '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' "
270 rm -f .git/index AA &&
272 git update-index --add AA &&
274 ! git read-tree -m $tree_O $tree_A $tree_B
277 test_expect_success \
278 '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' "
279 rm -f .git/index AA &&
282 git update-index --add AA &&
283 ! git read-tree -m $tree_O $tree_A $tree_B
286 test_expect_success \
287 '5 - must match in !O && A && B && A==B case.' \
288 "rm -f .git/index LL &&
290 git update-index --add LL &&
291 git read-tree -m $tree_O $tree_A $tree_B &&
294 test_expect_success \
295 '5 - must match in !O && A && B && A==B case.' \
296 "rm -f .git/index LL &&
298 git update-index --add LL &&
300 git read-tree -m $tree_O $tree_A $tree_B &&
303 test_expect_success \
304 '5 (fail) - must match A in !O && A && B && A==B case.' "
305 rm -f .git/index LL &&
308 git update-index --add LL &&
309 ! git read-tree -m $tree_O $tree_A $tree_B
312 test_expect_success \
313 '6 - must not exist in O && !A && !B case' "
314 rm -f .git/index DD &&
316 git update-index --add DD &&
317 ! git read-tree -m $tree_O $tree_A $tree_B
320 test_expect_success \
321 '7 - must not exist in O && !A && B && O!=B case' "
322 rm -f .git/index DM &&
324 git update-index --add DM &&
325 ! git read-tree -m $tree_O $tree_A $tree_B
328 test_expect_success \
329 '8 - must not exist in O && !A && B && O==B case' "
330 rm -f .git/index DN &&
332 git update-index --add DN &&
333 ! git read-tree -m $tree_O $tree_A $tree_B
336 test_expect_success \
337 '9 - must match and be up-to-date in O && A && !B && O!=A case' \
338 "rm -f .git/index MD &&
340 git update-index --add MD &&
341 git read-tree -m $tree_O $tree_A $tree_B &&
344 test_expect_success \
345 '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' "
346 rm -f .git/index MD &&
348 git update-index --add MD &&
350 ! git read-tree -m $tree_O $tree_A $tree_B
353 test_expect_success \
354 '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' "
355 rm -f .git/index MD &&
358 git update-index --add MD &&
359 ! git read-tree -m $tree_O $tree_A $tree_B
362 test_expect_success \
363 '10 - must match and be up-to-date in O && A && !B && O==A case' \
364 "rm -f .git/index ND &&
366 git update-index --add ND &&
367 git read-tree -m $tree_O $tree_A $tree_B &&
370 test_expect_success \
371 '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' "
372 rm -f .git/index ND &&
374 git update-index --add ND &&
376 ! git read-tree -m $tree_O $tree_A $tree_B
379 test_expect_success \
380 '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' "
381 rm -f .git/index ND &&
384 git update-index --add ND &&
385 ! git read-tree -m $tree_O $tree_A $tree_B
388 test_expect_success \
389 '11 - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' \
390 "rm -f .git/index MM &&
392 git update-index --add MM &&
393 git read-tree -m $tree_O $tree_A $tree_B &&
396 test_expect_success \
397 '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' "
398 rm -f .git/index MM &&
400 git update-index --add MM &&
402 ! git read-tree -m $tree_O $tree_A $tree_B
405 test_expect_success \
406 '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' "
407 rm -f .git/index MM &&
410 git update-index --add MM &&
411 ! git read-tree -m $tree_O $tree_A $tree_B
414 test_expect_success \
415 '12 - must match A in O && A && B && O!=A && A==B case' \
416 "rm -f .git/index SS &&
418 git update-index --add SS &&
419 git read-tree -m $tree_O $tree_A $tree_B &&
422 test_expect_success \
423 '12 - must match A in O && A && B && O!=A && A==B case' \
424 "rm -f .git/index SS &&
426 git update-index --add SS &&
428 git read-tree -m $tree_O $tree_A $tree_B &&
431 test_expect_success \
432 '12 (fail) - must match A in O && A && B && O!=A && A==B case' "
433 rm -f .git/index SS &&
436 git update-index --add SS &&
437 ! git read-tree -m $tree_O $tree_A $tree_B
440 test_expect_success \
441 '13 - must match A in O && A && B && O!=A && O==B case' \
442 "rm -f .git/index MN &&
444 git update-index --add MN &&
445 git read-tree -m $tree_O $tree_A $tree_B &&
448 test_expect_success \
449 '13 - must match A in O && A && B && O!=A && O==B case' \
450 "rm -f .git/index MN &&
452 git update-index --add MN &&
454 git read-tree -m $tree_O $tree_A $tree_B &&
457 test_expect_success \
458 '14 - must match and be up-to-date in O && A && B && O==A && O!=B case' \
459 "rm -f .git/index NM &&
461 git update-index --add NM &&
462 git read-tree -m $tree_O $tree_A $tree_B &&
465 test_expect_success \
466 '14 - may match B in O && A && B && O==A && O!=B case' \
467 "rm -f .git/index NM &&
469 git update-index --add NM &&
471 git read-tree -m $tree_O $tree_A $tree_B &&
474 test_expect_success \
475 '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' "
476 rm -f .git/index NM &&
478 git update-index --add NM &&
480 ! git read-tree -m $tree_O $tree_A $tree_B
483 test_expect_success \
484 '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' "
485 rm -f .git/index NM &&
488 git update-index --add NM &&
489 ! git read-tree -m $tree_O $tree_A $tree_B
492 test_expect_success \
493 '15 - must match A in O && A && B && O==A && O==B case' \
494 "rm -f .git/index NN &&
496 git update-index --add NN &&
497 git read-tree -m $tree_O $tree_A $tree_B &&
500 test_expect_success \
501 '15 - must match A in O && A && B && O==A && O==B case' \
502 "rm -f .git/index NN &&
504 git update-index --add NN &&
506 git read-tree -m $tree_O $tree_A $tree_B &&
509 test_expect_success \
510 '15 (fail) - must match A in O && A && B && O==A && O==B case' "
511 rm -f .git/index NN &&
514 git update-index --add NN &&
515 ! git read-tree -m $tree_O $tree_A $tree_B
519 test_expect_success \
520 '16 - A matches in one and B matches in another.' \
521 'rm -f .git/index F16 &&
523 git update-index --add F16 &&
524 tree0=`git write-tree` &&
526 git update-index F16 &&
527 tree1=`git write-tree` &&
528 git read-tree -m $tree0 $tree1 $tree1 $tree0 &&
529 git ls-files --stage'