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+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Three way merge with read-tree -m
+
+This test tries three-way merge with read-tree -m
+
+There is one ancestor (called O for Original) and two branches A
+and B derived from it. We want to do a 3-way merge between A and
+B, using O as the common ancestor.
+
+ merge A O B
+
+Decisions are made by comparing contents of O, A and B pathname
+by pathname. The result is determined by the following guiding
+principle:
+
+ - If only A does something to it and B does not touch it, take
+ whatever A does.
+
+ - If only B does something to it and A does not touch it, take
+ whatever B does.
+
+ - If both A and B does something but in the same way, take
+ whatever they do.
+
+ - If A and B does something but different things, we need a
+ 3-way merge:
+
+ - We cannot do anything about the following cases:
+
+ * O does not have it. A and B both must be adding to the
+ same path independently.
+
+ * A deletes it. B must be modifying.
+
+ - Otherwise, A and B are modifying. Run 3-way merge.
+
+First, the case matrix.
+
+ - Vertical axis is for A'\''s actions.
+ - Horizontal axis is for B'\''s actions.
+
+.----------------------------------------------------------------.
+| A B | No Action | Delete | Modify | Add |
+|------------+------------+------------+------------+------------|
+| No Action | | | | |
+| | select O | delete | select B | select B |
+| | | | | |
+|------------+------------+------------+------------+------------|
+| Delete | | | ********** | can |
+| | delete | delete | merge | not |
+| | | | | happen |
+|------------+------------+------------+------------+------------|
+| Modify | | ********** | ?????????? | can |
+| | select A | merge | select A=B | not |
+| | | | merge | happen |
+|------------+------------+------------+------------+------------|
+| Add | | can | can | ?????????? |
+| | select A | not | not | select A=B |
+| | | happen | happen | merge |
+.----------------------------------------------------------------.
+
+In addition:
+
+ SS: a special case of MM, where A and B makes the same modification.
+ LL: a special case of AA, where A and B creates the same file.
+ TT: a special case of MM, where A and B makes mergeable changes.
+ DF: a special case, where A makes a directory and B makes a file.
+
+'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-read-tree.sh
+. "$TEST_DIRECTORY"/lib-read-tree-m-3way.sh
+
+################################################################
+# Trivial "majority when 3 stages exist" merge plus #2ALT, #3ALT
+# and #5ALT trivial merges.
+
+cat >expected <<\EOF
+100644 X 2 AA
+100644 X 3 AA
+100644 X 0 AN
+100644 X 1 DD
+100644 X 3 DF
+100644 X 2 DF/DF
+100644 X 1 DM
+100644 X 3 DM
+100644 X 1 DN
+100644 X 3 DN
+100644 X 0 LL
+100644 X 1 MD
+100644 X 2 MD
+100644 X 1 MM
+100644 X 2 MM
+100644 X 3 MM
+100644 X 0 MN
+100644 X 0 NA
+100644 X 1 ND
+100644 X 2 ND
+100644 X 0 NM
+100644 X 0 NN
+100644 X 0 SS
+100644 X 1 TT
+100644 X 2 TT
+100644 X 3 TT
+100644 X 2 Z/AA
+100644 X 3 Z/AA
+100644 X 0 Z/AN
+100644 X 1 Z/DD
+100644 X 1 Z/DM
+100644 X 3 Z/DM
+100644 X 1 Z/DN
+100644 X 3 Z/DN
+100644 X 1 Z/MD
+100644 X 2 Z/MD
+100644 X 1 Z/MM
+100644 X 2 Z/MM
+100644 X 3 Z/MM
+100644 X 0 Z/MN
+100644 X 0 Z/NA
+100644 X 1 Z/ND
+100644 X 2 Z/ND
+100644 X 0 Z/NM
+100644 X 0 Z/NN
+EOF
+
+check_result () {
+ git ls-files --stage | sed -e 's/ '"$OID_REGEX"' / X /' >current &&
+ test_cmp expected current
+}
+
+# This is done on an empty work directory, which is the normal
+# merge person behaviour.
+test_expect_success '3-way merge with git read-tree -m, empty cache' '
+ rm -fr [NDMALTS][NDMALTSF] Z &&
+ rm .git/index &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+# This starts out with the first head, which is the normal
+# patch submitter behaviour.
+test_expect_success '3-way merge with git read-tree -m, match H' '
+ rm -fr [NDMALTS][NDMALTSF] Z &&
+ rm .git/index &&
+ read_tree_must_succeed $tree_A &&
+ git checkout-index -f -u -a &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+: <<\END_OF_CASE_TABLE
+
+We have so far tested only empty index and clean-and-matching-A index
+case which are trivial. Make sure index requirements are also
+checked.
+
+"git read-tree -m O A B"
+
+ O A B result index requirements
+-------------------------------------------------------------------
+ 1 missing missing missing - must not exist.
+ ------------------------------------------------------------------
+ 2 missing missing exists take B* must match B, if exists.
+ ------------------------------------------------------------------
+ 3 missing exists missing take A* must match A, if exists.
+ ------------------------------------------------------------------
+ 4 missing exists A!=B no merge must match A and be
+ up-to-date, if exists.
+ ------------------------------------------------------------------
+ 5 missing exists A==B take A must match A, if exists.
+ ------------------------------------------------------------------
+ 6 exists missing missing remove must not exist.
+ ------------------------------------------------------------------
+ 7 exists missing O!=B no merge must not exist.
+ ------------------------------------------------------------------
+ 8 exists missing O==B remove must not exist.
+ ------------------------------------------------------------------
+ 9 exists O!=A missing no merge must match A and be
+ up-to-date, if exists.
+ ------------------------------------------------------------------
+ 10 exists O==A missing no merge must match A
+ ------------------------------------------------------------------
+ 11 exists O!=A O!=B no merge must match A and be
+ A!=B up-to-date, if exists.
+ ------------------------------------------------------------------
+ 12 exists O!=A O!=B take A must match A, if exists.
+ A==B
+ ------------------------------------------------------------------
+ 13 exists O!=A O==B take A must match A, if exists.
+ ------------------------------------------------------------------
+ 14 exists O==A O!=B take B if exists, must either (1)
+ match A and be up-to-date,
+ or (2) match B.
+ ------------------------------------------------------------------
+ 15 exists O==A O==B take B must match A if exists.
+ ------------------------------------------------------------------
+ 16 exists O==A O==B barf must match A if exists.
+ *multi* in one in another
+-------------------------------------------------------------------
+
+Note: we need to be careful in case 2 and 3. The tree A may contain
+DF (file) when tree B require DF to be a directory by having DF/DF
+(file).
+
+END_OF_CASE_TABLE
+
+test_expect_success '1 - must not have an entry not in A.' '
+ rm -f .git/index XX &&
+ echo XX >XX &&
+ git update-index --add XX &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '2 - must match B in !O && !A && B case.' '
+ rm -f .git/index NA &&
+ cp .orig-B/NA NA &&
+ git update-index --add NA &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '2 - matching B alone is OK in !O && !A && B case.' '
+ rm -f .git/index NA &&
+ cp .orig-B/NA NA &&
+ git update-index --add NA &&
+ echo extra >>NA &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '3 - must match A in !O && A && !B case.' '
+ rm -f .git/index AN &&
+ cp .orig-A/AN AN &&
+ git update-index --add AN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '3 - matching A alone is OK in !O && A && !B case.' '
+ rm -f .git/index AN &&
+ cp .orig-A/AN AN &&
+ git update-index --add AN &&
+ echo extra >>AN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '3 (fail) - must match A in !O && A && !B case.' '
+ rm -f .git/index AN &&
+ cp .orig-A/AN AN &&
+ echo extra >>AN &&
+ git update-index --add AN &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '4 - must match and be up-to-date in !O && A && B && A!=B case.' '
+ rm -f .git/index AA &&
+ cp .orig-A/AA AA &&
+ git update-index --add AA &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' '
+ rm -f .git/index AA &&
+ cp .orig-A/AA AA &&
+ git update-index --add AA &&
+ echo extra >>AA &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '4 (fail) - must match and be up-to-date in !O && A && B && A!=B case.' '
+ rm -f .git/index AA &&
+ cp .orig-A/AA AA &&
+ echo extra >>AA &&
+ git update-index --add AA &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '5 - must match in !O && A && B && A==B case.' '
+ rm -f .git/index LL &&
+ cp .orig-A/LL LL &&
+ git update-index --add LL &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '5 - must match in !O && A && B && A==B case.' '
+ rm -f .git/index LL &&
+ cp .orig-A/LL LL &&
+ git update-index --add LL &&
+ echo extra >>LL &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '5 (fail) - must match A in !O && A && B && A==B case.' '
+ rm -f .git/index LL &&
+ cp .orig-A/LL LL &&
+ echo extra >>LL &&
+ git update-index --add LL &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '6 - must not exist in O && !A && !B case' '
+ rm -f .git/index DD &&
+ echo DD >DD &&
+ git update-index --add DD &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '7 - must not exist in O && !A && B && O!=B case' '
+ rm -f .git/index DM &&
+ cp .orig-B/DM DM &&
+ git update-index --add DM &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '8 - must not exist in O && !A && B && O==B case' '
+ rm -f .git/index DN &&
+ cp .orig-B/DN DN &&
+ git update-index --add DN &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '9 - must match and be up-to-date in O && A && !B && O!=A case' '
+ rm -f .git/index MD &&
+ cp .orig-A/MD MD &&
+ git update-index --add MD &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' '
+ rm -f .git/index MD &&
+ cp .orig-A/MD MD &&
+ git update-index --add MD &&
+ echo extra >>MD &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '9 (fail) - must match and be up-to-date in O && A && !B && O!=A case' '
+ rm -f .git/index MD &&
+ cp .orig-A/MD MD &&
+ echo extra >>MD &&
+ git update-index --add MD &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '10 - must match and be up-to-date in O && A && !B && O==A case' '
+ rm -f .git/index ND &&
+ cp .orig-A/ND ND &&
+ git update-index --add ND &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' '
+ rm -f .git/index ND &&
+ cp .orig-A/ND ND &&
+ git update-index --add ND &&
+ echo extra >>ND &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '10 (fail) - must match and be up-to-date in O && A && !B && O==A case' '
+ rm -f .git/index ND &&
+ cp .orig-A/ND ND &&
+ echo extra >>ND &&
+ git update-index --add ND &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '11 - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' '
+ rm -f .git/index MM &&
+ cp .orig-A/MM MM &&
+ git update-index --add MM &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' '
+ rm -f .git/index MM &&
+ cp .orig-A/MM MM &&
+ git update-index --add MM &&
+ echo extra >>MM &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '11 (fail) - must match and be up-to-date in O && A && B && O!=A && O!=B && A!=B case' '
+ rm -f .git/index MM &&
+ cp .orig-A/MM MM &&
+ echo extra >>MM &&
+ git update-index --add MM &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '12 - must match A in O && A && B && O!=A && A==B case' '
+ rm -f .git/index SS &&
+ cp .orig-A/SS SS &&
+ git update-index --add SS &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '12 - must match A in O && A && B && O!=A && A==B case' '
+ rm -f .git/index SS &&
+ cp .orig-A/SS SS &&
+ git update-index --add SS &&
+ echo extra >>SS &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '12 (fail) - must match A in O && A && B && O!=A && A==B case' '
+ rm -f .git/index SS &&
+ cp .orig-A/SS SS &&
+ echo extra >>SS &&
+ git update-index --add SS &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '13 - must match A in O && A && B && O!=A && O==B case' '
+ rm -f .git/index MN &&
+ cp .orig-A/MN MN &&
+ git update-index --add MN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '13 - must match A in O && A && B && O!=A && O==B case' '
+ rm -f .git/index MN &&
+ cp .orig-A/MN MN &&
+ git update-index --add MN &&
+ echo extra >>MN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '14 - must match and be up-to-date in O && A && B && O==A && O!=B case' '
+ rm -f .git/index NM &&
+ cp .orig-A/NM NM &&
+ git update-index --add NM &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '14 - may match B in O && A && B && O==A && O!=B case' '
+ rm -f .git/index NM &&
+ cp .orig-B/NM NM &&
+ git update-index --add NM &&
+ echo extra >>NM &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' '
+ rm -f .git/index NM &&
+ cp .orig-A/NM NM &&
+ git update-index --add NM &&
+ echo extra >>NM &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '14 (fail) - must match and be up-to-date in O && A && B && O==A && O!=B case' '
+ rm -f .git/index NM &&
+ cp .orig-A/NM NM &&
+ echo extra >>NM &&
+ git update-index --add NM &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '15 - must match A in O && A && B && O==A && O==B case' '
+ rm -f .git/index NN &&
+ cp .orig-A/NN NN &&
+ git update-index --add NN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '15 - must match A in O && A && B && O==A && O==B case' '
+ rm -f .git/index NN &&
+ cp .orig-A/NN NN &&
+ git update-index --add NN &&
+ echo extra >>NN &&
+ read_tree_must_succeed -m $tree_O $tree_A $tree_B &&
+ check_result
+'
+
+test_expect_success '15 (fail) - must match A in O && A && B && O==A && O==B case' '
+ rm -f .git/index NN &&
+ cp .orig-A/NN NN &&
+ echo extra >>NN &&
+ git update-index --add NN &&
+ read_tree_must_fail -m $tree_O $tree_A $tree_B
+'
+
+test_expect_success '16 - A matches in one and B matches in another.' '
+ rm -f .git/index F16 &&
+ echo F16 >F16 &&
+ git update-index --add F16 &&
+ tree0=$(git write-tree) &&
+ echo E16 >F16 &&
+ git update-index F16 &&
+ tree1=$(git write-tree) &&
+ read_tree_must_succeed -m $tree0 $tree1 $tree1 $tree0 &&
+ git ls-files --stage
+'
+
+test_done