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-rwxr-xr-xt/t6402-merge-rename.sh973
1 files changed, 973 insertions, 0 deletions
diff --git a/t/t6402-merge-rename.sh b/t/t6402-merge-rename.sh
new file mode 100755
index 0000000..2738b50
--- /dev/null
+++ b/t/t6402-merge-rename.sh
@@ -0,0 +1,973 @@
+#!/bin/sh
+
+test_description='Merge-recursive merging renames'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+modify () {
+ sed -e "$1" <"$2" >"$2.x" &&
+ mv "$2.x" "$2"
+}
+
+test_expect_success 'setup' '
+ cat >A <<-\EOF &&
+ a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+ b bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
+ c cccccccccccccccccccccccccccccccccccccccccccccccc
+ d dddddddddddddddddddddddddddddddddddddddddddddddd
+ e eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
+ f ffffffffffffffffffffffffffffffffffffffffffffffff
+ g gggggggggggggggggggggggggggggggggggggggggggggggg
+ h hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
+ i iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
+ j jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
+ k kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
+ l llllllllllllllllllllllllllllllllllllllllllllllll
+ m mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
+ n nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
+ o oooooooooooooooooooooooooooooooooooooooooooooooo
+ EOF
+
+ cat >M <<-\EOF &&
+ A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+ B BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
+ C CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
+ D DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
+ E EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
+ F FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
+ G GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
+ H HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
+ I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
+ J JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJ
+ K KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK
+ L LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
+ M MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
+ N NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
+ O OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
+ EOF
+
+ git add A M &&
+ git commit -m "initial has A and M" &&
+ git branch white &&
+ git branch red &&
+ git branch blue &&
+ git branch yellow &&
+ git branch change &&
+ git branch change+rename &&
+
+ sed -e "/^g /s/.*/g : main changes a line/" <A >A+ &&
+ mv A+ A &&
+ git commit -a -m "main updates A" &&
+
+ git checkout yellow &&
+ rm -f M &&
+ git commit -a -m "yellow removes M" &&
+
+ git checkout white &&
+ sed -e "/^g /s/.*/g : white changes a line/" <A >B &&
+ sed -e "/^G /s/.*/G : colored branch changes a line/" <M >N &&
+ rm -f A M &&
+ git update-index --add --remove A B M N &&
+ git commit -m "white renames A->B, M->N" &&
+
+ git checkout red &&
+ sed -e "/^g /s/.*/g : red changes a line/" <A >B &&
+ sed -e "/^G /s/.*/G : colored branch changes a line/" <M >N &&
+ rm -f A M &&
+ git update-index --add --remove A B M N &&
+ git commit -m "red renames A->B, M->N" &&
+
+ git checkout blue &&
+ sed -e "/^g /s/.*/g : blue changes a line/" <A >C &&
+ sed -e "/^G /s/.*/G : colored branch changes a line/" <M >N &&
+ rm -f A M &&
+ git update-index --add --remove A C M N &&
+ git commit -m "blue renames A->C, M->N" &&
+
+ git checkout change &&
+ sed -e "/^g /s/.*/g : changed line/" <A >A+ &&
+ mv A+ A &&
+ git commit -q -a -m "changed" &&
+
+ git checkout change+rename &&
+ sed -e "/^g /s/.*/g : changed line/" <A >B &&
+ rm A &&
+ git update-index --add B &&
+ git commit -q -a -m "changed and renamed" &&
+
+ git checkout main
+'
+
+test_expect_success 'pull renaming branch into unrenaming one' \
+'
+ git show-branch &&
+ test_expect_code 1 git pull --no-rebase . white &&
+ git ls-files -s &&
+ test_stdout_line_count = 3 git ls-files -u B &&
+ test_stdout_line_count = 1 git ls-files -s N &&
+ sed -ne "/^g/{
+ p
+ q
+ }" B | grep main &&
+ git diff --exit-code white N
+'
+
+test_expect_success 'pull renaming branch into another renaming one' \
+'
+ rm -f B &&
+ git reset --hard &&
+ git checkout red &&
+ test_expect_code 1 git pull --no-rebase . white &&
+ test_stdout_line_count = 3 git ls-files -u B &&
+ test_stdout_line_count = 1 git ls-files -s N &&
+ sed -ne "/^g/{
+ p
+ q
+ }" B | grep red &&
+ git diff --exit-code white N
+'
+
+test_expect_success 'pull unrenaming branch into renaming one' \
+'
+ git reset --hard &&
+ git show-branch &&
+ test_expect_code 1 git pull --no-rebase . main &&
+ test_stdout_line_count = 3 git ls-files -u B &&
+ test_stdout_line_count = 1 git ls-files -s N &&
+ sed -ne "/^g/{
+ p
+ q
+ }" B | grep red &&
+ git diff --exit-code white N
+'
+
+test_expect_success 'pull conflicting renames' \
+'
+ git reset --hard &&
+ git show-branch &&
+ test_expect_code 1 git pull --no-rebase . blue &&
+ test_stdout_line_count = 1 git ls-files -u A &&
+ test_stdout_line_count = 1 git ls-files -u B &&
+ test_stdout_line_count = 1 git ls-files -u C &&
+ test_stdout_line_count = 1 git ls-files -s N &&
+ sed -ne "/^g/{
+ p
+ q
+ }" B | grep red &&
+ git diff --exit-code white N
+'
+
+test_expect_success 'interference with untracked working tree file' '
+ git reset --hard &&
+ git show-branch &&
+ echo >A this file should not matter &&
+ test_expect_code 1 git pull --no-rebase . white &&
+ test_path_is_file A
+'
+
+test_expect_success 'interference with untracked working tree file' '
+ git reset --hard &&
+ git checkout white &&
+ git show-branch &&
+ rm -f A &&
+ echo >A this file should not matter &&
+ test_expect_code 1 git pull --no-rebase . red &&
+ test_path_is_file A
+'
+
+test_expect_success 'interference with untracked working tree file' '
+ git reset --hard &&
+ rm -f A M &&
+ git checkout -f main &&
+ git tag -f anchor &&
+ git show-branch &&
+ git pull --no-rebase . yellow &&
+ test_path_is_missing M &&
+ git reset --hard anchor
+'
+
+test_expect_success 'updated working tree file should prevent the merge' '
+ git reset --hard &&
+ rm -f A M &&
+ git checkout -f main &&
+ git tag -f anchor &&
+ git show-branch &&
+ echo >>M one line addition &&
+ cat M >M.saved &&
+ test_expect_code 128 git pull . yellow &&
+ test_cmp M M.saved &&
+ rm -f M.saved
+'
+
+test_expect_success 'updated working tree file should prevent the merge' '
+ git reset --hard &&
+ rm -f A M &&
+ git checkout -f main &&
+ git tag -f anchor &&
+ git show-branch &&
+ echo >>M one line addition &&
+ cat M >M.saved &&
+ git update-index M &&
+ test_expect_code 2 git pull --no-rebase . yellow &&
+ test_cmp M M.saved &&
+ rm -f M.saved
+'
+
+test_expect_success 'interference with untracked working tree file' '
+ git reset --hard &&
+ rm -f A M &&
+ git checkout -f yellow &&
+ git tag -f anchor &&
+ git show-branch &&
+ echo >M this file should not matter &&
+ git pull --no-rebase . main &&
+ test_path_is_file M &&
+ ! {
+ git ls-files -s |
+ grep M
+ } &&
+ git reset --hard anchor
+'
+
+test_expect_success 'merge of identical changes in a renamed file' '
+ rm -f A M N &&
+ git reset --hard &&
+ git checkout change+rename &&
+
+ test-tool chmtime --get -3600 B >old-mtime &&
+ GIT_MERGE_VERBOSITY=3 git merge change >out &&
+
+ test-tool chmtime --get B >new-mtime &&
+ test_cmp old-mtime new-mtime &&
+
+ git reset --hard HEAD^ &&
+ git checkout change &&
+
+ # A will be renamed to B; we check mtimes and file presence
+ test_path_is_missing B &&
+ test-tool chmtime --get -3600 A >old-mtime &&
+ GIT_MERGE_VERBOSITY=3 git merge change+rename >out &&
+
+ test_path_is_missing A &&
+ test-tool chmtime --get B >new-mtime &&
+ test $(cat old-mtime) -lt $(cat new-mtime)
+'
+
+test_expect_success 'setup for rename + d/f conflicts' '
+ git reset --hard &&
+ git checkout --orphan dir-in-way &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ mkdir sub &&
+ mkdir dir &&
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" >sub/file &&
+ echo foo >dir/file-in-the-way &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ echo 11 >>sub/file &&
+ echo more >>dir/file-in-the-way &&
+ git add -u &&
+ git commit -m "Commit to merge, with dir in the way" &&
+
+ git checkout -b dir-not-in-way &&
+ git reset --soft HEAD^ &&
+ git rm -rf dir &&
+ git commit -m "Commit to merge, with dir removed" -- dir sub/file &&
+
+ git checkout -b renamed-file-has-no-conflicts dir-in-way~1 &&
+ git rm -rf dir &&
+ git rm sub/file &&
+ printf "1\n2\n3\n4\n5555\n6\n7\n8\n9\n10\n" >dir &&
+ git add dir &&
+ git commit -m "Independent change" &&
+
+ git checkout -b renamed-file-has-conflicts dir-in-way~1 &&
+ git rm -rf dir &&
+ git mv sub/file dir &&
+ echo 12 >>dir &&
+ git add dir &&
+ git commit -m "Conflicting change"
+'
+
+test_expect_success 'Rename+D/F conflict; renamed file merges + dir not in way' '
+ git reset --hard &&
+ git checkout -q renamed-file-has-no-conflicts^0 &&
+
+ git merge --strategy=recursive dir-not-in-way &&
+
+ git diff --quiet &&
+ test_path_is_file dir &&
+ test_write_lines 1 2 3 4 5555 6 7 8 9 10 11 >expected &&
+ test_cmp expected dir
+'
+
+test_expect_success 'Rename+D/F conflict; renamed file merges but dir in way' '
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q renamed-file-has-no-conflicts^0 &&
+ test_must_fail git merge --strategy=recursive dir-in-way >output &&
+
+ test_grep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
+ test_grep "Auto-merging dir" output &&
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_grep "moving it to dir~HEAD instead" output
+ else
+ test_grep "Adding as dir~HEAD instead" output
+ fi &&
+
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
+
+ test_must_fail git diff --quiet &&
+ test_must_fail git diff --cached --quiet &&
+
+ test_path_is_file dir/file-in-the-way &&
+ test_path_is_file dir~HEAD &&
+ test_cmp expected dir~HEAD
+'
+
+test_expect_success 'Same as previous, but merged other way' '
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q dir-in-way^0 &&
+ test_must_fail git merge --strategy=recursive renamed-file-has-no-conflicts >output 2>errors &&
+
+ ! grep "error: refusing to lose untracked file at" errors &&
+ test_grep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
+ test_grep "Auto-merging dir" output &&
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_grep "moving it to dir~renamed-file-has-no-conflicts instead" output
+ else
+ test_grep "Adding as dir~renamed-file-has-no-conflicts instead" output
+ fi &&
+
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
+
+ test_must_fail git diff --quiet &&
+ test_must_fail git diff --cached --quiet &&
+
+ test_path_is_file dir/file-in-the-way &&
+ test_path_is_file dir~renamed-file-has-no-conflicts &&
+ test_cmp expected dir~renamed-file-has-no-conflicts
+'
+
+test_expect_success 'Rename+D/F conflict; renamed file cannot merge, dir not in way' '
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q renamed-file-has-conflicts^0 &&
+ test_must_fail git merge --strategy=recursive dir-not-in-way &&
+
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 3 git ls-files -u dir &&
+
+ test_must_fail git diff --quiet &&
+ test_must_fail git diff --cached --quiet &&
+
+ test_path_is_file dir &&
+ cat >expected <<-\EOF &&
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+ 10
+ <<<<<<< HEAD:dir
+ 12
+ =======
+ 11
+ >>>>>>> dir-not-in-way:sub/file
+ EOF
+ test_cmp expected dir
+'
+
+test_expect_success 'Rename+D/F conflict; renamed file cannot merge and dir in the way' '
+ modify s/dir-not-in-way/dir-in-way/ expected &&
+
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q renamed-file-has-conflicts^0 &&
+ test_must_fail git merge --strategy=recursive dir-in-way &&
+
+ test_stdout_line_count = 5 git ls-files -u &&
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_stdout_line_count = 3 git ls-files -u dir~HEAD
+ else
+ git ls-files -u dir >out &&
+ test 3 -eq $(grep -v file-in-the-way out | wc -l) &&
+ rm -f out
+ fi &&
+ test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
+
+ test_must_fail git diff --quiet &&
+ test_must_fail git diff --cached --quiet &&
+
+ test_path_is_file dir/file-in-the-way &&
+ test_path_is_file dir~HEAD &&
+ test_cmp expected dir~HEAD
+'
+
+test_expect_success 'Same as previous, but merged other way' '
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q dir-in-way^0 &&
+ test_must_fail git merge --strategy=recursive renamed-file-has-conflicts &&
+
+ test_stdout_line_count = 5 git ls-files -u &&
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_stdout_line_count = 3 git ls-files -u dir~renamed-file-has-conflicts
+ else
+ git ls-files -u dir >out &&
+ test 3 -eq $(grep -v file-in-the-way out | wc -l) &&
+ rm -f out
+ fi &&
+ test_stdout_line_count = 2 git ls-files -u dir/file-in-the-way &&
+
+ test_must_fail git diff --quiet &&
+ test_must_fail git diff --cached --quiet &&
+
+ test_path_is_file dir/file-in-the-way &&
+ test_path_is_file dir~renamed-file-has-conflicts &&
+ cat >expected <<-\EOF &&
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+ 10
+ <<<<<<< HEAD:sub/file
+ 11
+ =======
+ 12
+ >>>>>>> renamed-file-has-conflicts:dir
+ EOF
+ test_cmp expected dir~renamed-file-has-conflicts
+'
+
+test_expect_success 'setup both rename source and destination involved in D/F conflict' '
+ git reset --hard &&
+ git checkout --orphan rename-dest &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ mkdir one &&
+ echo stuff >one/file &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ git mv one/file destdir &&
+ git commit -m "Renamed to destdir" &&
+
+ git checkout -b source-conflict HEAD~1 &&
+ git rm -rf one &&
+ mkdir destdir &&
+ touch one destdir/foo &&
+ git add -A &&
+ git commit -m "Conflicts in the way"
+'
+
+test_expect_success 'both rename source and destination involved in D/F conflict' '
+ git reset --hard &&
+ rm -rf dir~* &&
+ git checkout -q rename-dest^0 &&
+ test_must_fail git merge --strategy=recursive source-conflict &&
+
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_stdout_line_count = 2 git ls-files -u
+ else
+ test_stdout_line_count = 1 git ls-files -u
+ fi &&
+
+ test_must_fail git diff --quiet &&
+
+ test_path_is_file destdir/foo &&
+ test_path_is_file one &&
+ test_path_is_file destdir~HEAD &&
+ test "stuff" = "$(cat destdir~HEAD)"
+'
+
+test_expect_success 'setup pair rename to parent of other (D/F conflicts)' '
+ git reset --hard &&
+ git checkout --orphan rename-two &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ mkdir one &&
+ mkdir two &&
+ echo stuff >one/file &&
+ echo other >two/file &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ git rm -rf one &&
+ git mv two/file one &&
+ git commit -m "Rename two/file -> one" &&
+
+ git checkout -b rename-one HEAD~1 &&
+ git rm -rf two &&
+ git mv one/file two &&
+ rm -r one &&
+ git commit -m "Rename one/file -> two"
+'
+
+if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+then
+ test_expect_success 'pair rename to parent of other (D/F conflicts) w/ untracked dir' '
+ git checkout -q rename-one^0 &&
+ mkdir one &&
+ test_must_fail git merge --strategy=recursive rename-two &&
+
+ test_stdout_line_count = 4 git ls-files -u &&
+ test_stdout_line_count = 2 git ls-files -u one &&
+ test_stdout_line_count = 2 git ls-files -u two &&
+
+ test_must_fail git diff --quiet &&
+
+ test 3 -eq $(find . | grep -v .git | wc -l) &&
+
+ test_path_is_file one &&
+ test_path_is_file two &&
+ test "other" = $(cat one) &&
+ test "stuff" = $(cat two)
+ '
+else
+ test_expect_success 'pair rename to parent of other (D/F conflicts) w/ untracked dir' '
+ git checkout -q rename-one^0 &&
+ mkdir one &&
+ test_must_fail git merge --strategy=recursive rename-two &&
+
+ test_stdout_line_count = 2 git ls-files -u &&
+ test_stdout_line_count = 1 git ls-files -u one &&
+ test_stdout_line_count = 1 git ls-files -u two &&
+
+ test_must_fail git diff --quiet &&
+
+ test 4 -eq $(find . | grep -v .git | wc -l) &&
+
+ test_path_is_dir one &&
+ test_path_is_file one~rename-two &&
+ test_path_is_file two &&
+ test "other" = $(cat one~rename-two) &&
+ test "stuff" = $(cat two)
+ '
+fi
+
+test_expect_success 'pair rename to parent of other (D/F conflicts) w/ clean start' '
+ git reset --hard &&
+ git clean -fdqx &&
+ test_must_fail git merge --strategy=recursive rename-two &&
+
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_stdout_line_count = 4 git ls-files -u &&
+ test_stdout_line_count = 2 git ls-files -u one &&
+ test_stdout_line_count = 2 git ls-files -u two
+ else
+ test_stdout_line_count = 2 git ls-files -u &&
+ test_stdout_line_count = 1 git ls-files -u one &&
+ test_stdout_line_count = 1 git ls-files -u two
+ fi &&
+
+ test_must_fail git diff --quiet &&
+
+ test 3 -eq $(find . | grep -v .git | wc -l) &&
+
+ test_path_is_file one &&
+ test_path_is_file two &&
+ test "other" = $(cat one) &&
+ test "stuff" = $(cat two)
+'
+
+test_expect_success 'setup rename of one file to two, with directories in the way' '
+ git reset --hard &&
+ git checkout --orphan first-rename &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ echo stuff >original &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ mkdir two &&
+ >two/file &&
+ git add two/file &&
+ git mv original one &&
+ git commit -m "Put two/file in the way, rename to one" &&
+
+ git checkout -b second-rename HEAD~1 &&
+ mkdir one &&
+ >one/file &&
+ git add one/file &&
+ git mv original two &&
+ git commit -m "Put one/file in the way, rename to two"
+'
+
+test_expect_success 'check handling of differently renamed file with D/F conflicts' '
+ git checkout -q first-rename^0 &&
+ test_must_fail git merge --strategy=recursive second-rename &&
+
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_stdout_line_count = 5 git ls-files -s &&
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 1 git ls-files -u one~HEAD &&
+ test_stdout_line_count = 1 git ls-files -u two~second-rename &&
+ test_stdout_line_count = 1 git ls-files -u original &&
+ test_stdout_line_count = 0 git ls-files -o
+ else
+ test_stdout_line_count = 5 git ls-files -s &&
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 1 git ls-files -u one &&
+ test_stdout_line_count = 1 git ls-files -u two &&
+ test_stdout_line_count = 1 git ls-files -u original &&
+ test_stdout_line_count = 2 git ls-files -o
+ fi &&
+
+ test_path_is_file one/file &&
+ test_path_is_file two/file &&
+ test_path_is_file one~HEAD &&
+ test_path_is_file two~second-rename &&
+ test_path_is_missing original
+'
+
+test_expect_success 'setup rename one file to two; directories moving out of the way' '
+ git reset --hard &&
+ git checkout --orphan first-rename-redo &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ echo stuff >original &&
+ mkdir one two &&
+ touch one/file two/file &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ git rm -rf one &&
+ git mv original one &&
+ git commit -m "Rename to one" &&
+
+ git checkout -b second-rename-redo HEAD~1 &&
+ git rm -rf two &&
+ git mv original two &&
+ git commit -m "Rename to two"
+'
+
+test_expect_success 'check handling of differently renamed file with D/F conflicts' '
+ git checkout -q first-rename-redo^0 &&
+ test_must_fail git merge --strategy=recursive second-rename-redo &&
+
+ test_stdout_line_count = 3 git ls-files -u &&
+ test_stdout_line_count = 1 git ls-files -u one &&
+ test_stdout_line_count = 1 git ls-files -u two &&
+ test_stdout_line_count = 1 git ls-files -u original &&
+ test_stdout_line_count = 0 git ls-files -o &&
+
+ test_path_is_file one &&
+ test_path_is_file two &&
+ test_path_is_missing original
+'
+
+test_expect_success 'setup avoid unnecessary update, normal rename' '
+ git reset --hard &&
+ git checkout --orphan avoid-unnecessary-update-1 &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" >original &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ git mv original rename &&
+ echo 11 >>rename &&
+ git add -u &&
+ git commit -m "Renamed and modified" &&
+
+ git checkout -b merge-branch-1 HEAD~1 &&
+ echo "random content" >random-file &&
+ git add -A &&
+ git commit -m "Random, unrelated changes"
+'
+
+test_expect_success 'avoid unnecessary update, normal rename' '
+ git checkout -q avoid-unnecessary-update-1^0 &&
+ test-tool chmtime --get -3600 rename >expect &&
+ git merge merge-branch-1 &&
+ test-tool chmtime --get rename >actual &&
+ test_cmp expect actual # "rename" should have stayed intact
+'
+
+test_expect_success 'setup to test avoiding unnecessary update, with D/F conflict' '
+ git reset --hard &&
+ git checkout --orphan avoid-unnecessary-update-2 &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ mkdir df &&
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n" >df/file &&
+ git add -A &&
+ git commit -m "Common commit" &&
+
+ git mv df/file temp &&
+ rm -rf df &&
+ git mv temp df &&
+ echo 11 >>df &&
+ git add -u &&
+ git commit -m "Renamed and modified" &&
+
+ git checkout -b merge-branch-2 HEAD~1 &&
+ >unrelated-change &&
+ git add unrelated-change &&
+ git commit -m "Only unrelated changes"
+'
+
+test_expect_success 'avoid unnecessary update, with D/F conflict' '
+ git checkout -q avoid-unnecessary-update-2^0 &&
+ test-tool chmtime --get -3600 df >expect &&
+ git merge merge-branch-2 &&
+ test-tool chmtime --get df >actual &&
+ test_cmp expect actual # "df" should have stayed intact
+'
+
+test_expect_success 'setup avoid unnecessary update, dir->(file,nothing)' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ >irrelevant &&
+ mkdir df &&
+ >df/file &&
+ git add -A &&
+ git commit -mA &&
+
+ git checkout -b side &&
+ git rm -rf df &&
+ git commit -mB &&
+
+ git checkout main &&
+ git rm -rf df &&
+ echo bla >df &&
+ git add -A &&
+ git commit -m "Add a newfile"
+'
+
+test_expect_success 'avoid unnecessary update, dir->(file,nothing)' '
+ git checkout -q main^0 &&
+ test-tool chmtime --get -3600 df >expect &&
+ git merge side &&
+ test-tool chmtime --get df >actual &&
+ test_cmp expect actual # "df" should have stayed intact
+'
+
+test_expect_success 'setup avoid unnecessary update, modify/delete' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ >irrelevant &&
+ >file &&
+ git add -A &&
+ git commit -mA &&
+
+ git checkout -b side &&
+ git rm -f file &&
+ git commit -m "Delete file" &&
+
+ git checkout main &&
+ echo bla >file &&
+ git add -A &&
+ git commit -m "Modify file"
+'
+
+test_expect_success 'avoid unnecessary update, modify/delete' '
+ git checkout -q main^0 &&
+ test-tool chmtime --get -3600 file >expect &&
+ test_must_fail git merge side &&
+ test-tool chmtime --get file >actual &&
+ test_cmp expect actual # "file" should have stayed intact
+'
+
+test_expect_success 'setup avoid unnecessary update, rename/add-dest' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n" >file &&
+ git add -A &&
+ git commit -mA &&
+
+ git checkout -b side &&
+ cp file newfile &&
+ git add -A &&
+ git commit -m "Add file copy" &&
+
+ git checkout main &&
+ git mv file newfile &&
+ git commit -m "Rename file"
+'
+
+test_expect_success 'avoid unnecessary update, rename/add-dest' '
+ git checkout -q main^0 &&
+ test-tool chmtime --get -3600 newfile >expect &&
+ git merge side &&
+ test-tool chmtime --get newfile >actual &&
+ test_cmp expect actual # "file" should have stayed intact
+'
+
+test_expect_success 'setup merge of rename + small change' '
+ git reset --hard &&
+ git checkout --orphan rename-plus-small-change &&
+ git rm -rf . &&
+ git clean -fdqx &&
+
+ echo ORIGINAL >file &&
+ git add file &&
+
+ test_tick &&
+ git commit -m Initial &&
+ git checkout -b rename_branch &&
+ git mv file renamed_file &&
+ git commit -m Rename &&
+ git checkout rename-plus-small-change &&
+ echo NEW-VERSION >file &&
+ git commit -a -m Reformat
+'
+
+test_expect_success 'merge rename + small change' '
+ git merge rename_branch &&
+
+ test_stdout_line_count = 1 git ls-files -s &&
+ test_stdout_line_count = 0 git ls-files -o &&
+ newhash=$(git rev-parse HEAD:renamed_file) &&
+ oldhash=$(git rev-parse HEAD~1:file) &&
+ test $newhash = $oldhash
+'
+
+test_expect_success 'setup for use of extended merge markers' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n" >original_file &&
+ git add original_file &&
+ git commit -mA &&
+
+ git checkout -b rename &&
+ echo 9 >>original_file &&
+ git add original_file &&
+ git mv original_file renamed_file &&
+ git commit -mB &&
+
+ git checkout main &&
+ echo 8.5 >>original_file &&
+ git add original_file &&
+ git commit -mC
+'
+
+test_expect_success 'merge main into rename has correct extended markers' '
+ git checkout rename^0 &&
+ test_must_fail git merge -s recursive main^0 &&
+
+ cat >expected <<-\EOF &&
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ <<<<<<< HEAD:renamed_file
+ 9
+ =======
+ 8.5
+ >>>>>>> main^0:original_file
+ EOF
+ test_cmp expected renamed_file
+'
+
+test_expect_success 'merge rename into main has correct extended markers' '
+ git reset --hard &&
+ git checkout main^0 &&
+ test_must_fail git merge -s recursive rename^0 &&
+
+ cat >expected <<-\EOF &&
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ <<<<<<< HEAD:original_file
+ 8.5
+ =======
+ 9
+ >>>>>>> rename^0:renamed_file
+ EOF
+ test_cmp expected renamed_file
+'
+
+test_expect_success 'setup spurious "refusing to lose untracked" message' '
+ git rm -rf . &&
+ git clean -fdqx &&
+ rm -rf .git &&
+ git init &&
+
+ > irrelevant_file &&
+ printf "1\n2\n3\n4\n5\n6\n7\n8\n" >original_file &&
+ git add irrelevant_file original_file &&
+ git commit -mA &&
+
+ git checkout -b rename &&
+ git mv original_file renamed_file &&
+ git commit -mB &&
+
+ git checkout main &&
+ git rm original_file &&
+ git commit -mC
+'
+
+test_expect_success 'no spurious "refusing to lose untracked" message' '
+ git checkout main^0 &&
+ test_must_fail git merge rename^0 2>errors.txt &&
+ ! grep "refusing to lose untracked file" errors.txt
+'
+
+test_expect_success 'do not follow renames for empty files' '
+ git checkout -f -b empty-base &&
+ >empty1 &&
+ git add empty1 &&
+ git commit -m base &&
+ echo content >empty1 &&
+ git add empty1 &&
+ git commit -m fill &&
+ git checkout -b empty-topic HEAD^ &&
+ git mv empty1 empty2 &&
+ git commit -m rename &&
+ test_must_fail git merge empty-base &&
+ test_must_be_empty empty2
+'
+
+test_done