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t1000-read-tree-m-3way.sh
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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-lib.sh
. ../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
_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
check_result () {
git-ls-files --stage | sed -e 's/ '"$_x40"' / X /' >current &&
diff -u 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 &&
git-read-tree -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 &&
git-read-tree $tree_A &&
git-checkout-cache -f -u -a &&
git-read-tree -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. The table also lists alternative semantics which is not
currently implemented.
"git-diff-tree -m O A B"
O A B result index requirements
-------------------------------------------------------------------
1 missing missing missing - must not exist.
------------------------------------------------------------------
2 missing missing exists no merge must not exist.
------------------------------------
(ALT) take B* must match B, if exists.
------------------------------------------------------------------
3 missing exists missing no merge must match A and be
up-to-date, if exists.
------------------------------------
(ALT) 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 no merge must match A and be
up-to-date, if exists.
------------------------------------
(ALT) take A must match A, if exists.
------------------------------------------------------------------
6 exists missing missing no merge must not exist.
------------------------------------
(ALT) remove must not exist.
------------------------------------------------------------------
7 exists missing O!=B no merge must not exist.
------------------------------------------------------------------
8 exists missing O==B no merge must not exist.
------------------------------------
(ALT) 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 and be
up-to-date, if exists.
------------------------------------
(ALT) remove ditto
------------------------------------------------------------------
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 must match A and be
be up-to-date, if exists.
------------------------------------
(ALT) 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.
-------------------------------------------------------------------
Note: if we want to implement 2ALT and 3ALT we need to be careful.
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_failure \
'1 - must not have an entry not in A.' \
"rm -f .git/index XX &&
echo XX >XX &&
git-update-cache --add XX &&
git-read-tree -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-cache --add NA &&
git-read-tree -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-cache --add NA &&
echo extra >>NA &&
git-read-tree -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-cache --add AN &&
git-read-tree -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-cache --add AN &&
echo extra >>AN &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add AN &&
git-read-tree -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-cache --add AA &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add AA &&
echo extra >>AA &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add AA &&
git-read-tree -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-cache --add LL &&
git-read-tree -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-cache --add LL &&
echo extra >>LL &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add LL &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'6 - must not exist in O && !A && !B case' \
"rm -f .git/index DD &&
echo DD >DD
git-update-cache --add DD &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'7 - must not exist in O && !A && B && O!=B case' \
"rm -f .git/index DM &&
cp .orig-B/DM DM &&
git-update-cache --add DM &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'8 - must not exist in O && !A && B && O==B case' \
"rm -f .git/index DN &&
cp .orig-B/DN DN &&
git-update-cache --add DN &&
git-read-tree -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-cache --add MD &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add MD &&
echo extra >>MD &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add MD &&
git-read-tree -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-cache --add ND &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add ND &&
echo extra >>ND &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add ND &&
git-read-tree -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-cache --add MM &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add MM &&
echo extra >>MM &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add MM &&
git-read-tree -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-cache --add SS &&
git-read-tree -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-cache --add SS &&
echo extra >>SS &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add SS &&
git-read-tree -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-cache --add MN &&
git-read-tree -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-cache --add MN &&
echo extra >>MN &&
git-read-tree -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-cache --add NM &&
git-read-tree -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-cache --add NM &&
echo extra >>NM &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add NM &&
echo extra >>NM &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_expect_failure \
'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-cache --add NM &&
git-read-tree -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-cache --add NN &&
git-read-tree -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-cache --add NN &&
echo extra >>NN &&
git-read-tree -m $tree_O $tree_A $tree_B &&
check_result"
test_expect_failure \
'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-cache --add NN &&
git-read-tree -m $tree_O $tree_A $tree_B"
test_done