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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:47:53 +0000
commitc8bae7493d2f2910b57f13ded012e86bdcfb0532 (patch)
tree24e09d9f84dec336720cf393e156089ca2835791 /t/t6430-merge-recursive.sh
parentInitial commit. (diff)
downloadgit-upstream/1%2.39.2.tar.xz
git-upstream/1%2.39.2.zip
Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 't/t6430-merge-recursive.sh')
-rwxr-xr-xt/t6430-merge-recursive.sh776
1 files changed, 776 insertions, 0 deletions
diff --git a/t/t6430-merge-recursive.sh b/t/t6430-merge-recursive.sh
new file mode 100755
index 0000000..07067bb
--- /dev/null
+++ b/t/t6430-merge-recursive.sh
@@ -0,0 +1,776 @@
+#!/bin/sh
+
+test_description='merge-recursive backend test'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-merge.sh
+
+test_expect_success 'setup 1' '
+
+ echo hello >a &&
+ o0=$(git hash-object a) &&
+ cp a b &&
+ cp a c &&
+ mkdir d &&
+ cp a d/e &&
+
+ test_tick &&
+ git add a b c d/e &&
+ git commit -m initial &&
+ c0=$(git rev-parse --verify HEAD) &&
+ git branch side &&
+ git branch df-1 &&
+ git branch df-2 &&
+ git branch df-3 &&
+ git branch remove &&
+ git branch submod &&
+ git branch copy &&
+ git branch rename &&
+ git branch rename-ln &&
+
+ echo hello >>a &&
+ cp a d/e &&
+ o1=$(git hash-object a) &&
+
+ git add a d/e &&
+
+ test_tick &&
+ git commit -m "main modifies a and d/e" &&
+ c1=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o1 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o1 d/e" &&
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'setup 2' '
+
+ rm -rf [abcd] &&
+ git checkout side &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ echo goodbye >>a &&
+ o2=$(git hash-object a) &&
+
+ git add a &&
+
+ test_tick &&
+ git commit -m "side modifies a" &&
+ c2=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o2 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o2 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'setup 3' '
+
+ rm -rf [abcd] &&
+ git checkout df-1 &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ rm -f b && mkdir b && echo df-1 >b/c && git add b/c &&
+ o3=$(git hash-object b/c) &&
+
+ test_tick &&
+ git commit -m "df-1 makes b/c" &&
+ c3=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o3 b/c" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o3 0 b/c" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'setup 4' '
+
+ rm -rf [abcd] &&
+ git checkout df-2 &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ rm -f a && mkdir a && echo df-2 >a/c && git add a/c &&
+ o4=$(git hash-object a/c) &&
+
+ test_tick &&
+ git commit -m "df-2 makes a/c" &&
+ c4=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o4 a/c" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o4 0 a/c" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'setup 5' '
+
+ rm -rf [abcd] &&
+ git checkout remove &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ rm -f b &&
+ echo remove-conflict >a &&
+
+ git add a &&
+ git rm b &&
+ o5=$(git hash-object a) &&
+
+ test_tick &&
+ git commit -m "remove removes b and modifies a" &&
+ c5=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o5 a" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o5 0 a" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'setup 6' '
+
+ rm -rf [abcd] &&
+ git checkout df-3 &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ rm -fr d && echo df-3 >d && git add d &&
+ o6=$(git hash-object d) &&
+
+ test_tick &&
+ git commit -m "df-3 makes d" &&
+ c6=$(git rev-parse --verify HEAD) &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o6 d" &&
+ echo "100644 $o0 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o6 0 d"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'setup 7' '
+
+ git checkout submod &&
+ git rm d/e &&
+ test_tick &&
+ git commit -m "remove d/e" &&
+ git update-index --add --cacheinfo 160000 $c1 d &&
+ test_tick &&
+ git commit -m "make d/ a submodule"
+'
+
+test_expect_success 'setup 8' '
+ git checkout rename &&
+ git mv a e &&
+ git add e &&
+ test_tick &&
+ git commit -m "rename a->e" &&
+ c7=$(git rev-parse --verify HEAD) &&
+ git checkout rename-ln &&
+ git mv a e &&
+ test_ln_s_add e a &&
+ test_tick &&
+ git commit -m "rename a->e, symlink a->e" &&
+ oln=$(printf e | git hash-object --stdin)
+'
+
+test_expect_success 'setup 9' '
+ git checkout copy &&
+ cp a e &&
+ git add e &&
+ test_tick &&
+ git commit -m "copy a->e"
+'
+
+test_expect_success 'merge-recursive simple' '
+
+ rm -fr [abcd] &&
+ git checkout -f "$c2" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c2" "$c1"
+'
+
+test_expect_success 'merge-recursive result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o0 1 a" &&
+ echo "100644 $o2 2 a" &&
+ echo "100644 $o1 3 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'fail if the index has unresolved entries' '
+
+ rm -fr [abcd] &&
+ git checkout -f "$c1" &&
+
+ test_must_fail git merge "$c5" &&
+ test_must_fail git merge "$c5" 2> out &&
+ test_i18ngrep "not possible because you have unmerged files" out &&
+ git add -u &&
+ test_must_fail git merge "$c5" 2> out &&
+ test_i18ngrep "You have not concluded your merge" out &&
+ rm -f .git/MERGE_HEAD &&
+ test_must_fail git merge "$c5" 2> out &&
+ test_i18ngrep "Your local changes to the following files would be overwritten by merge:" out
+'
+
+test_expect_success 'merge-recursive remove conflict' '
+
+ rm -fr [abcd] &&
+ git checkout -f "$c1" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c1" "$c5"
+'
+
+test_expect_success 'merge-recursive remove conflict' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o0 1 a" &&
+ echo "100644 $o1 2 a" &&
+ echo "100644 $o5 3 a" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive d/f simple' '
+ rm -fr [abcd] &&
+ git reset --hard &&
+ git checkout -f "$c1" &&
+
+ git merge-recursive "$c0" -- "$c1" "$c3"
+'
+
+test_expect_success 'merge-recursive result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o3 0 b/c" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive d/f conflict' '
+
+ rm -fr [abcd] &&
+ git reset --hard &&
+ git checkout -f "$c1" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c1" "$c4"
+'
+
+test_expect_success 'merge-recursive d/f conflict result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o0 1 a" &&
+ echo "100644 $o1 2 a" &&
+ echo "100644 $o4 0 a/c" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive d/f conflict the other way' '
+
+ rm -fr [abcd] &&
+ git reset --hard &&
+ git checkout -f "$c4" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c4" "$c1"
+'
+
+test_expect_success 'merge-recursive d/f conflict result the other way' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o0 1 a" &&
+ echo "100644 $o1 3 a" &&
+ echo "100644 $o4 0 a/c" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive d/f conflict' '
+
+ rm -fr [abcd] &&
+ git reset --hard &&
+ git checkout -f "$c1" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c1" "$c6"
+'
+
+test_expect_success 'merge-recursive d/f conflict result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o6 3 d" &&
+ echo "100644 $o0 1 d/e" &&
+ echo "100644 $o1 2 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive d/f conflict' '
+
+ rm -fr [abcd] &&
+ git reset --hard &&
+ git checkout -f "$c6" &&
+
+ test_expect_code 1 git merge-recursive "$c0" -- "$c6" "$c1"
+'
+
+test_expect_success 'merge-recursive d/f conflict result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o6 2 d" &&
+ echo "100644 $o0 1 d/e" &&
+ echo "100644 $o1 3 d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success SYMLINKS 'dir in working tree with symlink ancestor does not produce d/f conflict' '
+ git init sym &&
+ (
+ cd sym &&
+ ln -s . foo &&
+ mkdir bar &&
+ >bar/file &&
+ git add foo bar/file &&
+ git commit -m "foo symlink" &&
+
+ git checkout -b branch1 &&
+ git commit --allow-empty -m "empty commit" &&
+
+ git checkout main &&
+ git rm foo &&
+ mkdir foo &&
+ >foo/bar &&
+ git add foo/bar &&
+ git commit -m "replace foo symlink with real foo dir and foo/bar file" &&
+
+ git checkout branch1 &&
+
+ git cherry-pick main &&
+ test_path_is_dir foo &&
+ test_path_is_file foo/bar
+ )
+'
+
+test_expect_success 'reset and 3-way merge' '
+
+ git reset --hard "$c2" &&
+ git read-tree -m "$c0" "$c2" "$c1"
+
+'
+
+test_expect_success 'reset and bind merge' '
+
+ git reset --hard main &&
+ git read-tree --prefix=M/ main &&
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 M/a" &&
+ echo "100644 $o0 0 M/b" &&
+ echo "100644 $o0 0 M/c" &&
+ echo "100644 $o1 0 M/d/e" &&
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ git read-tree --prefix=a1/ main &&
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 M/a" &&
+ echo "100644 $o0 0 M/b" &&
+ echo "100644 $o0 0 M/c" &&
+ echo "100644 $o1 0 M/d/e" &&
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o1 0 a1/a" &&
+ echo "100644 $o0 0 a1/b" &&
+ echo "100644 $o0 0 a1/c" &&
+ echo "100644 $o1 0 a1/d/e" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e"
+ ) >expected &&
+ test_cmp expected actual &&
+
+ git read-tree --prefix=z/ main &&
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o1 0 M/a" &&
+ echo "100644 $o0 0 M/b" &&
+ echo "100644 $o0 0 M/c" &&
+ echo "100644 $o1 0 M/d/e" &&
+ echo "100644 $o1 0 a" &&
+ echo "100644 $o1 0 a1/a" &&
+ echo "100644 $o0 0 a1/b" &&
+ echo "100644 $o0 0 a1/c" &&
+ echo "100644 $o1 0 a1/d/e" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o1 0 d/e" &&
+ echo "100644 $o1 0 z/a" &&
+ echo "100644 $o0 0 z/b" &&
+ echo "100644 $o0 0 z/c" &&
+ echo "100644 $o1 0 z/d/e"
+ ) >expected &&
+ test_cmp expected actual
+
+'
+
+test_expect_success 'merge-recursive w/ empty work tree - ours has rename' '
+ (
+ GIT_WORK_TREE="$PWD/ours-has-rename-work" &&
+ export GIT_WORK_TREE &&
+ GIT_INDEX_FILE="$PWD/ours-has-rename-index" &&
+ export GIT_INDEX_FILE &&
+ mkdir "$GIT_WORK_TREE" &&
+ git read-tree -i -m $c7 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git update-index --ignore-missing --refresh 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git merge-recursive $c0 -- $c7 $c3 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git ls-files -s >actual-files 2>actual-err &&
+ test_must_be_empty actual-err
+ ) &&
+ cat >expected-files <<-EOF &&
+ 100644 $o3 0 b/c
+ 100644 $o0 0 c
+ 100644 $o0 0 d/e
+ 100644 $o0 0 e
+ EOF
+ test_cmp expected-files actual-files
+'
+
+test_expect_success 'merge-recursive w/ empty work tree - theirs has rename' '
+ (
+ GIT_WORK_TREE="$PWD/theirs-has-rename-work" &&
+ export GIT_WORK_TREE &&
+ GIT_INDEX_FILE="$PWD/theirs-has-rename-index" &&
+ export GIT_INDEX_FILE &&
+ mkdir "$GIT_WORK_TREE" &&
+ git read-tree -i -m $c3 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git update-index --ignore-missing --refresh 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git merge-recursive $c0 -- $c3 $c7 2>actual-err &&
+ test_must_be_empty actual-err &&
+ git ls-files -s >actual-files 2>actual-err &&
+ test_must_be_empty actual-err
+ ) &&
+ cat >expected-files <<-EOF &&
+ 100644 $o3 0 b/c
+ 100644 $o0 0 c
+ 100644 $o0 0 d/e
+ 100644 $o0 0 e
+ EOF
+ test_cmp expected-files actual-files
+'
+
+test_expect_success 'merge removes empty directories' '
+
+ git reset --hard main &&
+ git checkout -b rm &&
+ git rm d/e &&
+ git commit -mremoved-d/e &&
+ git checkout main &&
+ git merge -s recursive rm &&
+ test_path_is_missing d
+'
+
+test_expect_success 'merge-recursive simple w/submodule' '
+
+ git checkout submod &&
+ git merge remove
+'
+
+test_expect_success 'merge-recursive simple w/submodule result' '
+
+ git ls-files -s >actual &&
+ (
+ echo "100644 $o5 0 a" &&
+ echo "100644 $o0 0 c" &&
+ echo "160000 $c1 0 d"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'merge-recursive copy vs. rename' '
+ git checkout -f copy &&
+ git merge rename &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 blob $o0 e" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e" &&
+ echo "100644 $o0 0 e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_merge_algorithm failure success 'merge-recursive rename vs. rename/symlink' '
+
+ git checkout -f rename &&
+ git merge rename-ln &&
+ ( git ls-tree -r HEAD && git ls-files -s ) >actual &&
+ (
+ echo "120000 blob $oln a" &&
+ echo "100644 blob $o0 b" &&
+ echo "100644 blob $o0 c" &&
+ echo "100644 blob $o0 d/e" &&
+ echo "100644 blob $o0 e" &&
+ echo "120000 $oln 0 a" &&
+ echo "100644 $o0 0 b" &&
+ echo "100644 $o0 0 c" &&
+ echo "100644 $o0 0 d/e" &&
+ echo "100644 $o0 0 e"
+ ) >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'merging with triple rename across D/F conflict' '
+ git reset --hard HEAD &&
+ git checkout -b topic &&
+ git rm -rf . &&
+
+ echo "just a file" >sub1 &&
+ mkdir -p sub2 &&
+ echo content1 >sub2/file1 &&
+ echo content2 >sub2/file2 &&
+ echo content3 >sub2/file3 &&
+ mkdir simple &&
+ echo base >simple/bar &&
+ git add -A &&
+ test_tick &&
+ git commit -m base &&
+
+ git checkout -b other &&
+ echo more >>simple/bar &&
+ test_tick &&
+ git commit -a -m changesimplefile &&
+
+ git checkout topic &&
+ git rm sub1 &&
+ git mv sub2 sub1 &&
+ test_tick &&
+ git commit -m changefiletodir &&
+
+ test_tick &&
+ git merge other
+'
+
+test_expect_success 'merge-recursive remembers the names of all base trees' '
+ git reset --hard HEAD &&
+
+ # make the index match $c1 so that merge-recursive below does not
+ # fail early
+ git diff --binary HEAD $c1 -- | git apply --cached &&
+
+ # more trees than static slots used by oid_to_hex()
+ for commit in $c0 $c2 $c4 $c5 $c6 $c7
+ do
+ git rev-parse "$commit^{tree}" || return 1
+ done >trees &&
+
+ # ignore the return code; it only fails because the input is weird...
+ test_must_fail git -c merge.verbosity=5 merge-recursive $(cat trees) -- $c1 $c3 >out &&
+
+ # ...but make sure it fails in the expected way
+ test_i18ngrep CONFLICT.*rename/rename out &&
+
+ # merge-recursive prints in reverse order, but we do not care
+ sort <trees >expect &&
+ sed -n "s/^virtual //p" out | sort >actual &&
+ test_cmp expect actual &&
+
+ git clean -fd
+'
+
+test_expect_success 'merge-recursive internal merge resolves to the sameness' '
+ git reset --hard HEAD &&
+
+ # We are going to create a history leading to two criss-cross
+ # branches A and B. The common ancestor at the bottom, O0,
+ # has two child commits O1 and O2, both of which will be merge
+ # base between A and B, like so:
+ #
+ # O1---A
+ # / \ /
+ # O0 .
+ # \ / \
+ # O2---B
+ #
+ # The recently added "check to see if the index is different from
+ # the tree into which something else is getting merged" check must
+ # NOT kick in when an inner merge between O1 and O2 is made. Both
+ # O1 and O2 happen to have the same tree as O0 in this test to
+ # trigger the bug---whether the inner merge is made by merging O2
+ # into O1 or O1 into O2, their common ancestor O0 and the branch
+ # being merged have the same tree. We should not trigger the "is
+ # the index dirty?" check in this case.
+
+ echo "zero" >file &&
+ git add file &&
+ test_tick &&
+ git commit -m "O0" &&
+ O0=$(git rev-parse HEAD) &&
+
+ test_tick &&
+ git commit --allow-empty -m "O1" &&
+ O1=$(git rev-parse HEAD) &&
+
+ git reset --hard $O0 &&
+ test_tick &&
+ git commit --allow-empty -m "O2" &&
+ O2=$(git rev-parse HEAD) &&
+
+ test_tick &&
+ git merge -s ours $O1 &&
+ B=$(git rev-parse HEAD) &&
+
+ git reset --hard $O1 &&
+ test_tick &&
+ git merge -s ours $O2 &&
+ A=$(git rev-parse HEAD) &&
+
+ git merge $B
+'
+
+test_done