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Elijah Newren b2a7942b8b merge-recursive: increase marker length with depth of recursion 
Later patches in this series will modify file collision conflict
handling (e.g. from rename/add and rename/rename(2to1) conflicts) so
that multiply nested conflict markers can arise even before considering
conflicts in the virtual merge base.  Including the virtual merge base
will provide a way to get triply (or higher) nested conflict markers.
This new way to get nested conflict markers will force the need for a
more general mechanism to extend the length of conflict markers in order
to differentiate between different nestings.

Along with this change to conflict marker length handling, we want to
make sure that we don't regress handling for other types of conflicts
with nested conflict markers.  Add a more involved testcase using
merge.conflictstyle=diff3, where not only does the virtual merge base
contain conflicts, but its virtual merge base does as well (i.e. a case
with triply nested conflict markers).  While there are multiple
reasonable ways to handle nested conflict markers in the virtual merge
base for this type of situation, the easiest approach that dovetails
well with the new needs for the file collision conflict handling is to
require that the length of the conflict markers increase with each
subsequent nesting.

Subsequent patches which change the rename/add and rename/rename(2to1)
conflict handling will modify the extra_marker_size flag appropriately
for their new needs.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-11-08 14:23:53 +09:00

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#!/bin/sh
test_description='recursive merge corner cases involving criss-cross merges'
. ./test-lib.sh
#
# L1 L2
# o---o
# / \ / \
# o X ?
# \ / \ /
# o---o
# R1 R2
#
test_expect_success 'setup basic criss-cross + rename with no modifications' '
test_create_repo basic-rename &&
(
cd basic-rename &&
ten="0 1 2 3 4 5 6 7 8 9" &&
for i in $ten
do
echo line $i in a sample file
done >one &&
for i in $ten
do
echo line $i in another sample file
done >two &&
git add one two &&
test_tick && git commit -m initial &&
git branch L1 &&
git checkout -b R1 &&
git mv one three &&
test_tick && git commit -m R1 &&
git checkout L1 &&
git mv two three &&
test_tick && git commit -m L1 &&
git checkout L1^0 &&
test_tick && git merge -s ours R1 &&
git tag L2 &&
git checkout R1^0 &&
test_tick && git merge -s ours L1 &&
git tag R2
)
'
test_expect_success 'merge simple rename+criss-cross with no modifications' '
(
cd basic-rename &&
git reset --hard &&
git checkout L2^0 &&
test_must_fail git merge -s recursive R2^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 3 out &&
git rev-parse >expect \
L2:three R2:three \
L2:three R2:three &&
git rev-parse >actual \
:2:three :3:three &&
git hash-object >>actual \
three~HEAD three~R2^0 &&
test_cmp expect actual
)
'
#
# Same as before, but modify L1 slightly:
#
# L1m L2
# o---o
# / \ / \
# o X ?
# \ / \ /
# o---o
# R1 R2
#
test_expect_success 'setup criss-cross + rename merges with basic modification' '
test_create_repo rename-modify &&
(
cd rename-modify &&
ten="0 1 2 3 4 5 6 7 8 9" &&
for i in $ten
do
echo line $i in a sample file
done >one &&
for i in $ten
do
echo line $i in another sample file
done >two &&
git add one two &&
test_tick && git commit -m initial &&
git branch L1 &&
git checkout -b R1 &&
git mv one three &&
echo more >>two &&
git add two &&
test_tick && git commit -m R1 &&
git checkout L1 &&
git mv two three &&
test_tick && git commit -m L1 &&
git checkout L1^0 &&
test_tick && git merge -s ours R1 &&
git tag L2 &&
git checkout R1^0 &&
test_tick && git merge -s ours L1 &&
git tag R2
)
'
test_expect_success 'merge criss-cross + rename merges with basic modification' '
(
cd rename-modify &&
git checkout L2^0 &&
test_must_fail git merge -s recursive R2^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 3 out &&
git rev-parse >expect \
L2:three R2:three \
L2:three R2:three &&
git rev-parse >actual \
:2:three :3:three &&
git hash-object >>actual \
three~HEAD three~R2^0 &&
test_cmp expect actual
)
'
#
# For the next test, we start with three commits in two lines of development
# which setup a rename/add conflict:
# Commit A: File 'a' exists
# Commit B: Rename 'a' -> 'new_a'
# Commit C: Modify 'a', create different 'new_a'
# Later, two different people merge and resolve differently:
# Commit D: Merge B & C, ignoring separately created 'new_a'
# Commit E: Merge B & C making use of some piece of secondary 'new_a'
# Finally, someone goes to merge D & E. Does git detect the conflict?
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
test_expect_success 'setup differently handled merges of rename/add conflict' '
test_create_repo rename-add &&
(
cd rename-add &&
printf "0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n" >a &&
git add a &&
test_tick && git commit -m A &&
git branch B &&
git checkout -b C &&
echo 10 >>a &&
echo "other content" >>new_a &&
git add a new_a &&
test_tick && git commit -m C &&
git checkout B &&
git mv a new_a &&
test_tick && git commit -m B &&
git checkout B^0 &&
test_must_fail git merge C &&
git clean -f &&
test_tick && git commit -m D &&
git tag D &&
git checkout C^0 &&
test_must_fail git merge B &&
rm new_a~HEAD new_a &&
printf "Incorrectly merged content" >>new_a &&
git add -u &&
test_tick && git commit -m E &&
git tag E
)
'
test_expect_success 'git detects differently handled merges conflict' '
(
cd rename-add &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
D:new_a E:new_a &&
git rev-parse >actual \
:2:new_a :3:new_a &&
test_cmp expect actual &&
git cat-file -p C:new_a >ours &&
git cat-file -p B:new_a >theirs &&
>empty &&
test_must_fail git merge-file \
-L "Temporary merge branch 1" \
-L "" \
-L "Temporary merge branch 2" \
ours empty theirs &&
sed -e "s/^\([<=>]\)/\1\1\1/" ours >expect &&
git cat-file -p :1:new_a >actual &&
test_cmp expect actual
)
'
#
# criss-cross + modify/delete:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: file with contents 'A\n'
# Commit B: file with contents 'B\n'
# Commit C: file not present
# Commit D: file with contents 'B\n'
# Commit E: file not present
#
# Merging commits D & E should result in modify/delete conflict.
test_expect_success 'setup criss-cross + modify/delete resolved differently' '
test_create_repo modify-delete &&
(
cd modify-delete &&
echo A >file &&
git add file &&
test_tick &&
git commit -m A &&
git branch B &&
git checkout -b C &&
git rm file &&
test_tick &&
git commit -m C &&
git checkout B &&
echo B >file &&
git add file &&
test_tick &&
git commit -m B &&
git checkout B^0 &&
test_must_fail git merge C &&
echo B >file &&
git add file &&
test_tick &&
git commit -m D &&
git tag D &&
git checkout C^0 &&
test_must_fail git merge B &&
git rm file &&
test_tick &&
git commit -m E &&
git tag E
)
'
test_expect_success 'git detects conflict merging criss-cross+modify/delete' '
(
cd modify-delete &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git rev-parse >expect \
master:file B:file &&
git rev-parse >actual \
:1:file :2:file &&
test_cmp expect actual
)
'
test_expect_success 'git detects conflict merging criss-cross+modify/delete, reverse direction' '
(
cd modify-delete &&
git reset --hard &&
git checkout E^0 &&
test_must_fail git merge -s recursive D^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git rev-parse >expect \
master:file B:file &&
git rev-parse >actual \
:1:file :3:file &&
test_cmp expect actual
)
'
# SORRY FOR THE SUPER LONG DESCRIPTION, BUT THIS NEXT ONE IS HAIRY
#
# criss-cross + d/f conflict via add/add:
# Commit A: Neither file 'a' nor directory 'a/' exists.
# Commit B: Introduce 'a'
# Commit C: Introduce 'a/file'
# Commit D1: Merge B & C, keeping 'a' and deleting 'a/'
# Commit E1: Merge B & C, deleting 'a' but keeping 'a/file'
#
# B D1 or D2
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E1 or E2 or E3
#
# I'll describe D2, E2, & E3 (which are alternatives for D1 & E1) more below...
#
# Merging D1 & E1 requires we first create a virtual merge base X from
# merging A & B in memory. There are several possibilities for the merge-base:
# 1: Keep both 'a' and 'a/file' (assuming crazy filesystem allowing a tree
# with a directory and file at same path): results in merge of D1 & E1
# being clean with both files deleted. Bad (no conflict detected).
# 2: Keep 'a' but not 'a/file': Merging D1 & E1 is clean and matches E1. Bad.
# 3: Keep 'a/file' but not 'a': Merging D1 & E1 is clean and matches D1. Bad.
# 4: Keep neither file: Merging D1 & E1 reports the D/F add/add conflict.
#
# So 4 sounds good for this case, but if we were to merge D1 & E3, where E3
# is defined as:
# Commit E3: Merge B & C, keeping modified a, and deleting a/
# then we'd get an add/add conflict for 'a', which seems suboptimal. A little
# creativity leads us to an alternate choice:
# 5: Keep 'a' as 'a~$UNIQUE' and a/file; results:
# Merge D1 & E1: rename/delete conflict for 'a'; a/file silently deleted
# Merge D1 & E3 is clean, as expected.
#
# So choice 5 at least provides some kind of conflict for the original case,
# and can merge cleanly as expected with D1 and E3. It also made things just
# slightly funny for merging D1 and e$, where E4 is defined as:
# Commit E4: Merge B & C, modifying 'a' and renaming to 'a2', and deleting 'a/'
# in this case, we'll get a rename/rename(1to2) conflict because a~$UNIQUE
# gets renamed to 'a' in D1 and to 'a2' in E4. But that's better than having
# two files (both 'a' and 'a2') sitting around without the user being notified
# that we could detect they were related and need to be merged. Also, choice
# 5 makes the handling of 'a/file' seem suboptimal. What if we were to merge
# D2 and E4, where D2 is:
# Commit D2: Merge B & C, renaming 'a'->'a2', keeping 'a/file'
# This would result in a clean merge with 'a2' having three-way merged
# contents (good), and deleting 'a/' (bad) -- it doesn't detect the
# conflict in how the different sides treated a/file differently.
# Continuing down the creative route:
# 6: Keep 'a' as 'a~$UNIQUE1' and keep 'a/' as 'a~$UNIQUE2/'; results:
# Merge D1 & E1: rename/delete conflict for 'a' and each path under 'a/'.
# Merge D1 & E3: clean, as expected.
# Merge D1 & E4: rename/rename(1to2) conflict on 'a' vs 'a2'.
# Merge D2 & E4: clean for 'a2', rename/delete for a/file
#
# Choice 6 could cause rename detection to take longer (providing more targets
# that need to be searched). Also, the conflict message for each path under
# 'a/' might be annoying unless we can detect it at the directory level, print
# it once, and then suppress it for individual filepaths underneath.
#
#
# As of time of writing, git uses choice 5. Directory rename detection and
# rename detection performance improvements might make choice 6 a desirable
# improvement. But we can at least document where we fall short for now...
#
#
# Historically, this testcase also used:
# Commit E2: Merge B & C, deleting 'a' but keeping slightly modified 'a/file'
# The merge of D1 & E2 is very similar to D1 & E1 -- it has similar issues for
# path 'a', but should always result in a modify/delete conflict for path
# 'a/file'. These tests ran the two merges
# D1 & E1
# D1 & E2
# in both directions, to check for directional issues with D/F conflict
# handling. Later we added
# D1 & E3
# D1 & E4
# D2 & E4
# for good measure, though we only ran those one way because we had pretty
# good confidence in merge-recursive's directional handling of D/F issues.
#
# Just to summarize all the intermediate merge commits:
# Commit D1: Merge B & C, keeping a and deleting a/
# Commit D2: Merge B & C, renaming a->a2, keeping a/file
# Commit E1: Merge B & C, deleting a but keeping a/file
# Commit E2: Merge B & C, deleting a but keeping slightly modified a/file
# Commit E3: Merge B & C, keeping modified a, and deleting a/
# Commit E4: Merge B & C, modifying 'a' and renaming to 'a2', and deleting 'a/'
#
test_expect_success 'setup differently handled merges of directory/file conflict' '
test_create_repo directory-file &&
(
cd directory-file &&
>ignore-me &&
git add ignore-me &&
test_tick &&
git commit -m A &&
git tag A &&
git branch B &&
git checkout -b C &&
mkdir a &&
test_write_lines a b c d e f g >a/file &&
git add a/file &&
test_tick &&
git commit -m C &&
git checkout B &&
test_write_lines 1 2 3 4 5 6 7 >a &&
git add a &&
test_tick &&
git commit -m B &&
git checkout B^0 &&
git merge -s ours -m D1 C^0 &&
git tag D1 &&
git checkout B^0 &&
test_must_fail git merge C^0 &&
git clean -fd &&
git rm -rf a/ &&
git rm a &&
git cat-file -p B:a >a2 &&
git add a2 &&
git commit -m D2 &&
git tag D2 &&
git checkout C^0 &&
git merge -s ours -m E1 B^0 &&
git tag E1 &&
git checkout C^0 &&
git merge -s ours -m E2 B^0 &&
test_write_lines a b c d e f g h >a/file &&
git add a/file &&
git commit --amend -C HEAD &&
git tag E2 &&
git checkout C^0 &&
test_must_fail git merge B^0 &&
git clean -fd &&
git rm -rf a/ &&
test_write_lines 1 2 3 4 5 6 7 8 >a &&
git add a &&
git commit -m E3 &&
git tag E3 &&
git checkout C^0 &&
test_must_fail git merge B^0 &&
git clean -fd &&
git rm -rf a/ &&
git rm a &&
test_write_lines 1 2 3 4 5 6 7 8 >a2 &&
git add a2 &&
git commit -m E4 &&
git tag E4
)
'
test_expect_success 'merge of D1 & E1 fails but has appropriate contents' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout D1^0 &&
test_must_fail git merge -s recursive E1^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 1 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:ignore-me B:a &&
git rev-parse >actual \
:0:ignore-me :2:a &&
test_cmp expect actual
)
'
test_expect_success 'merge of E1 & D1 fails but has appropriate contents' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout E1^0 &&
test_must_fail git merge -s recursive D1^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 1 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:ignore-me B:a &&
git rev-parse >actual \
:0:ignore-me :3:a &&
test_cmp expect actual
)
'
test_expect_success 'merge of D1 & E2 fails but has appropriate contents' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout D1^0 &&
test_must_fail git merge -s recursive E2^0 &&
git ls-files -s >out &&
test_line_count = 4 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 2 out &&
git rev-parse >expect \
B:a E2:a/file C:a/file A:ignore-me &&
git rev-parse >actual \
:2:a :3:a/file :1:a/file :0:ignore-me &&
test_cmp expect actual &&
test_path_is_file a~HEAD
)
'
test_expect_success 'merge of E2 & D1 fails but has appropriate contents' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout E2^0 &&
test_must_fail git merge -s recursive D1^0 &&
git ls-files -s >out &&
test_line_count = 4 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 2 out &&
git rev-parse >expect \
B:a E2:a/file C:a/file A:ignore-me &&
git rev-parse >actual \
:3:a :2:a/file :1:a/file :0:ignore-me &&
test_cmp expect actual &&
test_path_is_file a~D1^0
)
'
test_expect_success 'merge of D1 & E3 succeeds' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout D1^0 &&
git merge -s recursive E3^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 0 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:ignore-me E3:a &&
git rev-parse >actual \
:0:ignore-me :0:a &&
test_cmp expect actual
)
'
test_expect_success 'merge of D1 & E4 notifies user a and a2 are related' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout D1^0 &&
test_must_fail git merge -s recursive E4^0 &&
git ls-files -s >out &&
test_line_count = 4 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:ignore-me B:a D1:a E4:a2 &&
git rev-parse >actual \
:0:ignore-me :1:a~Temporary\ merge\ branch\ 2 :2:a :3:a2 &&
test_cmp expect actual
)
'
test_expect_failure 'merge of D2 & E4 merges a2s & reports conflict for a/file' '
test_when_finished "git -C directory-file reset --hard" &&
test_when_finished "git -C directory-file clean -fdqx" &&
(
cd directory-file &&
git checkout D2^0 &&
test_must_fail git merge -s recursive E4^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 1 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:ignore-me E4:a2 D2:a/file &&
git rev-parse >actual \
:0:ignore-me :0:a2 :2:a/file &&
test_cmp expect actual
)
'
#
# criss-cross with rename/rename(1to2)/modify followed by
# rename/rename(2to1)/modify:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: new file: a
# Commit B: rename a->b, modifying by adding a line
# Commit C: rename a->c
# Commit D: merge B&C, resolving conflict by keeping contents in newname
# Commit E: merge B&C, resolving conflict similar to D but adding another line
#
# There is a conflict merging B & C, but one of filename not of file
# content. Whoever created D and E chose specific resolutions for that
# conflict resolution. Now, since: (1) there is no content conflict
# merging B & C, (2) D does not modify that merged content further, and (3)
# both D & E resolve the name conflict in the same way, the modification to
# newname in E should not cause any conflicts when it is merged with D.
# (Note that this can be accomplished by having the virtual merge base have
# the merged contents of b and c stored in a file named a, which seems like
# the most logical choice anyway.)
#
# Comment from Junio: I do not necessarily agree with the choice "a", but
# it feels sound to say "B and C do not agree what the final pathname
# should be, but we know this content was derived from the common A:a so we
# use one path whose name is arbitrary in the virtual merge base X between
# D and E" and then further let the rename detection to notice that that
# arbitrary path gets renamed between X-D to "newname" and X-E also to
# "newname" to resolve it as both sides renaming it to the same new
# name. It is akin to what we do at the content level, i.e. "B and C do not
# agree what the final contents should be, so we leave the conflict marker
# but that may cancel out at the final merge stage".
test_expect_success 'setup rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
test_create_repo rename-squared-squared &&
(
cd rename-squared-squared &&
printf "1\n2\n3\n4\n5\n6\n" >a &&
git add a &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git mv a b &&
echo 7 >>b &&
git add -u &&
git commit -m B &&
git checkout -b C A &&
git mv a c &&
git commit -m C &&
git checkout -q B^0 &&
git merge --no-commit -s ours C^0 &&
git mv b newname &&
git commit -m "Merge commit C^0 into HEAD" &&
git tag D &&
git checkout -q C^0 &&
git merge --no-commit -s ours B^0 &&
git mv c newname &&
printf "7\n8\n" >>newname &&
git add -u &&
git commit -m "Merge commit B^0 into HEAD" &&
git tag E
)
'
test_expect_success 'handle rename/rename(1to2)/modify followed by what looks like rename/rename(2to1)/modify' '
(
cd rename-squared-squared &&
git checkout D^0 &&
git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 1 out &&
git ls-files -u >out &&
test_line_count = 0 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
test $(git rev-parse HEAD:newname) = $(git rev-parse E:newname)
)
'
#
# criss-cross with rename/rename(1to2)/add-source + resolvable modify/modify:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: new file: a
# Commit B: rename a->b
# Commit C: rename a->c, add different a
# Commit D: merge B&C, keeping b&c and (new) a modified at beginning
# Commit E: merge B&C, keeping b&c and (new) a modified at end
#
# Merging commits D & E should result in no conflict; doing so correctly
# requires getting the virtual merge base (from merging B&C) right, handling
# renaming carefully (both in the virtual merge base and later), and getting
# content merge handled.
test_expect_success 'setup criss-cross + rename/rename/add-source + modify/modify' '
test_create_repo rename-rename-add-source &&
(
cd rename-rename-add-source &&
printf "lots\nof\nwords\nand\ncontent\n" >a &&
git add a &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git mv a b &&
git commit -m B &&
git checkout -b C A &&
git mv a c &&
printf "2\n3\n4\n5\n6\n7\n" >a &&
git add a &&
git commit -m C &&
git checkout B^0 &&
git merge --no-commit -s ours C^0 &&
git checkout C -- a c &&
mv a old_a &&
echo 1 >a &&
cat old_a >>a &&
rm old_a &&
git add -u &&
git commit -m "Merge commit C^0 into HEAD" &&
git tag D &&
git checkout C^0 &&
git merge --no-commit -s ours B^0 &&
git checkout B -- b &&
echo 8 >>a &&
git add -u &&
git commit -m "Merge commit B^0 into HEAD" &&
git tag E
)
'
test_expect_failure 'detect rename/rename/add-source for virtual merge-base' '
(
cd rename-rename-add-source &&
git checkout D^0 &&
git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 0 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
printf "1\n2\n3\n4\n5\n6\n7\n8\n" >correct &&
git rev-parse >expect \
A:a A:a \
correct &&
git rev-parse >actual \
:0:b :0:c &&
git hash-object >>actual \
a &&
test_cmp expect actual
)
'
#
# criss-cross with rename/rename(1to2)/add-dest + simple modify:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: new file: a
# Commit B: rename a->b, add c
# Commit C: rename a->c
# Commit D: merge B&C, keeping A:a and B:c
# Commit E: merge B&C, keeping A:a and slightly modified c from B
#
# Merging commits D & E should result in no conflict. The virtual merge
# base of B & C needs to not delete B:c for that to work, though...
test_expect_success 'setup criss-cross+rename/rename/add-dest + simple modify' '
test_create_repo rename-rename-add-dest &&
(
cd rename-rename-add-dest &&
>a &&
git add a &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git mv a b &&
printf "1\n2\n3\n4\n5\n6\n7\n" >c &&
git add c &&
git commit -m B &&
git checkout -b C A &&
git mv a c &&
git commit -m C &&
git checkout B^0 &&
git merge --no-commit -s ours C^0 &&
git mv b a &&
git commit -m "D is like B but renames b back to a" &&
git tag D &&
git checkout B^0 &&
git merge --no-commit -s ours C^0 &&
git mv b a &&
echo 8 >>c &&
git add c &&
git commit -m "E like D but has mod in c" &&
git tag E
)
'
test_expect_success 'virtual merge base handles rename/rename(1to2)/add-dest' '
(
cd rename-rename-add-dest &&
git checkout D^0 &&
git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 0 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >expect \
A:a E:c &&
git rev-parse >actual \
:0:a :0:c &&
test_cmp expect actual
)
'
#
# criss-cross with modify/modify on a symlink:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: simple simlink fickle->lagoon
# Commit B: redirect fickle->disneyland
# Commit C: redirect fickle->home
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious modify/modify conflict for the symlink 'fickle'. Can
# git detect it?
test_expect_success 'setup symlink modify/modify' '
test_create_repo symlink-modify-modify &&
(
cd symlink-modify-modify &&
test_ln_s_add lagoon fickle &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git rm fickle &&
test_ln_s_add disneyland fickle &&
git commit -m B &&
git checkout -b C A &&
git rm fickle &&
test_ln_s_add home fickle &&
git add fickle &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check symlink modify/modify' '
(
cd symlink-modify-modify &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
#
# criss-cross with add/add of a symlink:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: No symlink or path exists yet
# Commit B: set up symlink: fickle->disneyland
# Commit C: set up symlink: fickle->home
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious add/add conflict for the symlink 'fickle'. Can
# git detect it?
test_expect_success 'setup symlink add/add' '
test_create_repo symlink-add-add &&
(
cd symlink-add-add &&
touch ignoreme &&
git add ignoreme &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
test_ln_s_add disneyland fickle &&
git commit -m B &&
git checkout -b C A &&
test_ln_s_add home fickle &&
git add fickle &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check symlink add/add' '
(
cd symlink-add-add &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
#
# criss-cross with modify/modify on a submodule:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: simple submodule repo
# Commit B: update repo
# Commit C: update repo differently
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious modify/modify conflict for the submodule 'repo'. Can
# git detect it?
test_expect_success 'setup submodule modify/modify' '
test_create_repo submodule-modify-modify &&
(
cd submodule-modify-modify &&
test_create_repo submod &&
(
cd submod &&
touch file-A &&
git add file-A &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
touch file-B &&
git add file-B &&
git commit -m B &&
git tag B &&
git checkout -b C A &&
touch file-C &&
git add file-C &&
git commit -m C &&
git tag C
) &&
git -C submod reset --hard A &&
git add submod &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git -C submod reset --hard B &&
git add submod &&
git commit -m B &&
git checkout -b C A &&
git -C submod reset --hard C &&
git add submod &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check submodule modify/modify' '
(
cd submodule-modify-modify &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
#
# criss-cross with add/add on a submodule:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: nothing of note
# Commit B: introduce submodule repo
# Commit C: introduce submodule repo at different commit
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious add/add conflict for the submodule 'repo'. Can
# git detect it?
test_expect_success 'setup submodule add/add' '
test_create_repo submodule-add-add &&
(
cd submodule-add-add &&
test_create_repo submod &&
(
cd submod &&
touch file-A &&
git add file-A &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
touch file-B &&
git add file-B &&
git commit -m B &&
git tag B &&
git checkout -b C A &&
touch file-C &&
git add file-C &&
git commit -m C &&
git tag C
) &&
touch irrelevant-file &&
git add irrelevant-file &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git -C submod reset --hard B &&
git add submod &&
git commit -m B &&
git checkout -b C A &&
git -C submod reset --hard C &&
git add submod &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check submodule add/add' '
(
cd submodule-add-add &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
#
# criss-cross with conflicting entry types:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: nothing of note
# Commit B: introduce submodule 'path'
# Commit C: introduce symlink 'path'
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious add/add conflict for 'path'. Can git detect it?
test_expect_success 'setup conflicting entry types (submodule vs symlink)' '
test_create_repo submodule-symlink-add-add &&
(
cd submodule-symlink-add-add &&
test_create_repo path &&
(
cd path &&
touch file-B &&
git add file-B &&
git commit -m B &&
git tag B
) &&
touch irrelevant-file &&
git add irrelevant-file &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
git -C path reset --hard B &&
git add path &&
git commit -m B &&
git checkout -b C A &&
rm -rf path/ &&
test_ln_s_add irrelevant-file path &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check conflicting entry types (submodule vs symlink)' '
(
cd submodule-symlink-add-add &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
#
# criss-cross with regular files that have conflicting modes:
#
# B D
# o---o
# / \ / \
# A o X ? F
# \ / \ /
# o---o
# C E
#
# Commit A: nothing of note
# Commit B: introduce file source_me.bash, not executable
# Commit C: introduce file source_me.bash, executable
# Commit D: merge B&C, resolving in favor of B
# Commit E: merge B&C, resolving in favor of C
#
# This is an obvious add/add mode conflict. Can git detect it?
test_expect_success 'setup conflicting modes for regular file' '
test_create_repo regular-file-mode-conflict &&
(
cd regular-file-mode-conflict &&
touch irrelevant-file &&
git add irrelevant-file &&
git commit -m A &&
git tag A &&
git checkout -b B A &&
echo "command_to_run" >source_me.bash &&
git add source_me.bash &&
git commit -m B &&
git checkout -b C A &&
echo "command_to_run" >source_me.bash &&
git add source_me.bash &&
test_chmod +x source_me.bash &&
git commit -m C &&
git checkout -q B^0 &&
git merge -s ours -m D C^0 &&
git tag D &&
git checkout -q C^0 &&
git merge -s ours -m E B^0 &&
git tag E
)
'
test_expect_failure 'check conflicting modes for regular file' '
(
cd regular-file-mode-conflict &&
git checkout D^0 &&
test_must_fail git merge -s recursive E^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
git ls-files -o >out &&
test_line_count = 1 out
)
'
# Setup:
# L1---L2
# / \ / \
# master X ?
# \ / \ /
# R1---R2
#
# Where:
# master has two files, named 'b' and 'a'
# branches L1 and R1 both modify each of the two files in conflicting ways
#
# L2 is a merge of R1 into L1; more on it later.
# R2 is a merge of L1 into R1; more on it later.
#
# X is an auto-generated merge-base used when merging L2 and R2.
# since X is a merge of L1 and R1, it has conflicting versions of each file
#
# More about L2 and R2:
# - both resolve the conflicts in 'b' and 'a' differently
# - L2 renames 'b' to 'm'
# - R2 renames 'a' to 'm'
#
# In the end, in file 'm' we have four different conflicting files (from
# two versions of 'b' and two of 'a'). In addition, if
# merge.conflictstyle is diff3, then the base version also has
# conflict markers of its own, leading to a total of three levels of
# conflict markers. This is a pretty weird corner case, but we just want
# to ensure that we handle it as well as practical.
test_expect_success 'setup nested conflicts' '
test_create_repo nested_conflicts &&
(
cd nested_conflicts &&
# Create some related files now
for i in $(test_seq 1 10)
do
echo Random base content line $i
done >initial &&
cp initial b_L1 &&
cp initial b_R1 &&
cp initial b_L2 &&
cp initial b_R2 &&
cp initial a_L1 &&
cp initial a_R1 &&
cp initial a_L2 &&
cp initial a_R2 &&
test_write_lines b b_L1 >>b_L1 &&
test_write_lines b b_R1 >>b_R1 &&
test_write_lines b b_L2 >>b_L2 &&
test_write_lines b b_R2 >>b_R2 &&
test_write_lines a a_L1 >>a_L1 &&
test_write_lines a a_R1 >>a_R1 &&
test_write_lines a a_L2 >>a_L2 &&
test_write_lines a a_R2 >>a_R2 &&
# Setup original commit (or merge-base), consisting of
# files named "b" and "a"
cp initial b &&
cp initial a &&
echo b >>b &&
echo a >>a &&
git add b a &&
test_tick && git commit -m initial &&
git branch L &&
git branch R &&
# Handle the left side
git checkout L &&
mv -f b_L1 b &&
mv -f a_L1 a &&
git add b a &&
test_tick && git commit -m "version L1 of files" &&
git tag L1 &&
# Handle the right side
git checkout R &&
mv -f b_R1 b &&
mv -f a_R1 a &&
git add b a &&
test_tick && git commit -m "verson R1 of files" &&
git tag R1 &&
# Create first merge on left side
git checkout L &&
test_must_fail git merge R1 &&
mv -f b_L2 b &&
mv -f a_L2 a &&
git add b a &&
git mv b m &&
test_tick && git commit -m "left merge, rename b->m" &&
git tag L2 &&
# Create first merge on right side
git checkout R &&
test_must_fail git merge L1 &&
mv -f b_R2 b &&
mv -f a_R2 a &&
git add b a &&
git mv a m &&
test_tick && git commit -m "right merge, rename a->m" &&
git tag R2
)
'
test_expect_failure 'check nested conflicts' '
(
cd nested_conflicts &&
git clean -f &&
git checkout L2^0 &&
# Merge must fail; there is a conflict
test_must_fail git -c merge.conflictstyle=diff3 merge -s recursive R2^0 &&
# Make sure the index has the right number of entries
git ls-files -s >out &&
test_line_count = 2 out &&
git ls-files -u >out &&
test_line_count = 2 out &&
# Ensure we have the correct number of untracked files
git ls-files -o >out &&
test_line_count = 1 out &&
# Create a and b from virtual merge base X
git cat-file -p master:a >base &&
git cat-file -p L1:a >ours &&
git cat-file -p R1:a >theirs &&
test_must_fail git merge-file --diff3 \
-L "Temporary merge branch 1" \
-L "merged common ancestors" \
-L "Temporary merge branch 2" \
ours \
base \
theirs &&
sed -e "s/^\([<|=>]\)/\1\1/" ours >vmb_a &&
git cat-file -p master:b >base &&
git cat-file -p L1:b >ours &&
git cat-file -p R1:b >theirs &&
test_must_fail git merge-file --diff3 \
-L "Temporary merge branch 1" \
-L "merged common ancestors" \
-L "Temporary merge branch 2" \
ours \
base \
theirs &&
sed -e "s/^\([<|=>]\)/\1\1/" ours >vmb_b &&
# Compare :2:m to expected values
git cat-file -p L2:m >ours &&
git cat-file -p R2:b >theirs &&
test_must_fail git merge-file --diff3 \
-L "HEAD:m" \
-L "merged common ancestors:b" \
-L "R2^0:b" \
ours \
vmb_b \
theirs &&
sed -e "s/^\([<|=>]\)/\1\1/" ours >m_stage_2 &&
git cat-file -p :2:m >actual &&
test_cmp m_stage_2 actual &&
# Compare :3:m to expected values
git cat-file -p L2:a >ours &&
git cat-file -p R2:m >theirs &&
test_must_fail git merge-file --diff3 \
-L "HEAD:a" \
-L "merged common ancestors:a" \
-L "R2^0:m" \
ours \
vmb_a \
theirs &&
sed -e "s/^\([<|=>]\)/\1\1/" ours >m_stage_3 &&
git cat-file -p :3:m >actual &&
test_cmp m_stage_3 actual &&
# Compare m to expected contents
>empty &&
cp -a m_stage_2 expected_final_m &&
test_must_fail git merge-file --diff3 \
-L "HEAD" \
-L "merged common ancestors" \
-L "R2^0" \
expected_final_m \
empty \
m_stage_3 &&
test_cmp expected_final_m m
)
'
# Setup:
# L1---L2---L3
# / \ / \ / \
# master X1 X2 ?
# \ / \ / \ /
# R1---R2---R3
#
# Where:
# master has one file named 'content'
# branches L1 and R1 both modify each of the two files in conflicting ways
#
# L<n> (n>1) is a merge of R<n-1> into L<n-1>
# R<n> (n>1) is a merge of L<n-1> into R<n-1>
# L<n> and R<n> resolve the conflicts differently.
#
# X<n> is an auto-generated merge-base used when merging L<n+1> and R<n+1>.
# By construction, X1 has conflict markers due to conflicting versions.
# X2, due to using merge.conflictstyle=3, has nested conflict markers.
#
# So, merging R3 into L3 using merge.conflictstyle=3 should show the
# nested conflict markers from X2 in the base version -- that means we
# have three levels of conflict markers. Can we distinguish all three?
test_expect_success 'setup virtual merge base with nested conflicts' '
test_create_repo virtual_merge_base_has_nested_conflicts &&
(
cd virtual_merge_base_has_nested_conflicts &&
# Create some related files now
for i in $(test_seq 1 10)
do
echo Random base content line $i
done >content &&
# Setup original commit
git add content &&
test_tick && git commit -m initial &&
git branch L &&
git branch R &&
# Create L1
git checkout L &&
echo left >>content &&
git add content &&
test_tick && git commit -m "version L1 of content" &&
git tag L1 &&
# Create R1
git checkout R &&
echo right >>content &&
git add content &&
test_tick && git commit -m "verson R1 of content" &&
git tag R1 &&
# Create L2
git checkout L &&
test_must_fail git -c merge.conflictstyle=diff3 merge R1 &&
git checkout L1 content &&
test_tick && git commit -m "version L2 of content" &&
git tag L2 &&
# Create R2
git checkout R &&
test_must_fail git -c merge.conflictstyle=diff3 merge L1 &&
git checkout R1 content &&
test_tick && git commit -m "version R2 of content" &&
git tag R2 &&
# Create L3
git checkout L &&
test_must_fail git -c merge.conflictstyle=diff3 merge R2 &&
git checkout L1 content &&
test_tick && git commit -m "version L3 of content" &&
git tag L3 &&
# Create R3
git checkout R &&
test_must_fail git -c merge.conflictstyle=diff3 merge L2 &&
git checkout R1 content &&
test_tick && git commit -m "version R3 of content" &&
git tag R3
)
'
test_expect_success 'check virtual merge base with nested conflicts' '
(
cd virtual_merge_base_has_nested_conflicts &&
git checkout L3^0 &&
# Merge must fail; there is a conflict
test_must_fail git -c merge.conflictstyle=diff3 merge -s recursive R3^0 &&
# Make sure the index has the right number of entries
git ls-files -s >out &&
test_line_count = 3 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
# Ensure we have the correct number of untracked files
git ls-files -o >out &&
test_line_count = 1 out &&
# Compare :[23]:content to expected values
git rev-parse L1:content R1:content >expect &&
git rev-parse :2:content :3:content >actual &&
test_cmp expect actual &&
# Imitate X1 merge base, except without long enough conflict
# markers because a subsequent sed will modify them. Put
# result into vmb.
git cat-file -p master:content >base &&
git cat-file -p L:content >left &&
git cat-file -p R:content >right &&
cp left merged-once &&
test_must_fail git merge-file --diff3 \
-L "Temporary merge branch 1" \
-L "merged common ancestors" \
-L "Temporary merge branch 2" \
merged-once \
base \
right &&
sed -e "s/^\([<|=>]\)/\1\1\1/" merged-once >vmb &&
# Imitate X2 merge base, overwriting vmb. Note that we
# extend both sets of conflict markers to make them longer
# with the sed command.
cp left merged-twice &&
test_must_fail git merge-file --diff3 \
-L "Temporary merge branch 1" \
-L "merged common ancestors" \
-L "Temporary merge branch 2" \
merged-twice \
vmb \
right &&
sed -e "s/^\([<|=>]\)/\1\1\1/" merged-twice >vmb &&
# Compare :1:content to expected value
git cat-file -p :1:content >actual &&
test_cmp vmb actual &&
# Determine expected content in final outer merge, compare to
# what the merge generated.
cp -f left expect &&
test_must_fail git merge-file --diff3 \
-L "HEAD" -L "merged common ancestors" -L "R3^0" \
expect vmb right &&
test_cmp expect content
)
'
test_done
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