#!/bin/sh

test_description='Merge-recursive merging renames'
. ./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 : master changes a line/" <A >A+ &&
mv A+ A &&
git commit -a -m "master 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 master'

test_expect_success 'pull renaming branch into unrenaming one' \
'
        git show-branch &&
        test_expect_code 1 git pull . white &&
        git ls-files -s &&
        git ls-files -u B >b.stages &&
        test_line_count = 3 b.stages &&
        git ls-files -s N >n.stages &&
        test_line_count = 1 n.stages &&
        sed -ne "/^g/{
        p
        q
        }" B | grep master &&
        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 . white &&
        git ls-files -u B >b.stages &&
        test_line_count = 3 b.stages &&
        git ls-files -s N >n.stages &&
        test_line_count = 1 n.stages &&
        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 . master &&
        git ls-files -u B >b.stages &&
        test_line_count = 3 b.stages &&
        git ls-files -s N >n.stages &&
        test_line_count = 1 n.stages &&
        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 . blue &&
        git ls-files -u A >a.stages &&
        test_line_count = 1 a.stages &&
        git ls-files -u B >b.stages &&
        test_line_count = 1 b.stages &&
        git ls-files -u C >c.stages &&
        test_line_count = 1 c.stages &&
        git ls-files -s N >n.stages &&
        test_line_count = 1 n.stages &&
        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 . 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 . 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 master &&
        git tag -f anchor &&
        git show-branch &&
        git pull . 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 master &&
        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 master &&
        git tag -f anchor &&
        git show-branch &&
        echo >>M one line addition &&
        cat M >M.saved &&
        git update-index M &&
        test_expect_code 128 git pull . 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 . master &&
        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 &&
        GIT_MERGE_VERBOSITY=3 git merge change >out &&
        test_i18ngrep "^Skipped B" out &&
        git reset --hard HEAD^ &&
        git checkout change &&
        GIT_MERGE_VERBOSITY=3 git merge change+rename >out &&
        test_i18ngrep "^Skipped B" out
'

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"
'

printf "1\n2\n3\n4\n5555\n6\n7\n8\n9\n10\n11\n" >expected

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 -f dir &&
        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_i18ngrep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
        test_i18ngrep "Auto-merging dir" output &&
        test_i18ngrep "Adding as dir~HEAD instead" output &&

        test 3 -eq "$(git ls-files -u | wc -l)" &&
        test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&

        test_must_fail git diff --quiet &&
        test_must_fail git diff --cached --quiet &&

        test -f dir/file-in-the-way &&
        test -f 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_i18ngrep "CONFLICT (modify/delete): dir/file-in-the-way" output &&
        test_i18ngrep "Auto-merging dir" output &&
        test_i18ngrep "Adding as dir~renamed-file-has-no-conflicts instead" output &&

        test 3 -eq "$(git ls-files -u | wc -l)" &&
        test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&

        test_must_fail git diff --quiet &&
        test_must_fail git diff --cached --quiet &&

        test -f dir/file-in-the-way &&
        test -f dir~renamed-file-has-no-conflicts &&
        test_cmp expected dir~renamed-file-has-no-conflicts
'

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_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 3 -eq "$(git ls-files -u | wc -l)" &&
        test 3 -eq "$(git ls-files -u dir | wc -l)" &&

        test_must_fail git diff --quiet &&
        test_must_fail git diff --cached --quiet &&

        test -f dir &&
        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 5 -eq "$(git ls-files -u | wc -l)" &&
        test 3 -eq "$(git ls-files -u dir | grep -v file-in-the-way | wc -l)" &&
        test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&

        test_must_fail git diff --quiet &&
        test_must_fail git diff --cached --quiet &&

        test -f dir/file-in-the-way &&
        test -f dir~HEAD &&
        test_cmp expected dir~HEAD
'

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_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 5 -eq "$(git ls-files -u | wc -l)" &&
        test 3 -eq "$(git ls-files -u dir | grep -v file-in-the-way | wc -l)" &&
        test 2 -eq "$(git ls-files -u dir/file-in-the-way | wc -l)" &&

        test_must_fail git diff --quiet &&
        test_must_fail git diff --cached --quiet &&

        test -f dir/file-in-the-way &&
        test -f dir~renamed-file-has-conflicts &&
        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 &&

        test 1 -eq "$(git ls-files -u | wc -l)" &&

        test_must_fail git diff --quiet &&

        test -f destdir/foo &&
        test -f one &&
        test -f 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"
'

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 2 -eq "$(git ls-files -u | wc -l)" &&
        test 1 -eq "$(git ls-files -u one | wc -l)" &&
        test 1 -eq "$(git ls-files -u two | wc -l)" &&

        test_must_fail git diff --quiet &&

        test 4 -eq $(find . | grep -v .git | wc -l) &&

        test -d one &&
        test -f one~rename-two &&
        test -f two &&
        test "other" = $(cat one~rename-two) &&
        test "stuff" = $(cat two)
'

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 &&

        test 2 -eq "$(git ls-files -u | wc -l)" &&
        test 1 -eq "$(git ls-files -u one | wc -l)" &&
        test 1 -eq "$(git ls-files -u two | wc -l)" &&

        test_must_fail git diff --quiet &&

        test 3 -eq $(find . | grep -v .git | wc -l) &&

        test -f one &&
        test -f 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 &&

        test 5 -eq "$(git ls-files -s | wc -l)" &&
        test 3 -eq "$(git ls-files -u | wc -l)" &&
        test 1 -eq "$(git ls-files -u one | wc -l)" &&
        test 1 -eq "$(git ls-files -u two | wc -l)" &&
        test 1 -eq "$(git ls-files -u original | wc -l)" &&
        test 2 -eq "$(git ls-files -o | wc -l)" &&

        test -f one/file &&
        test -f two/file &&
        test -f one~HEAD &&
        test -f two~second-rename &&
        ! test -f 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 3 -eq "$(git ls-files -u | wc -l)" &&
        test 1 -eq "$(git ls-files -u one | wc -l)" &&
        test 1 -eq "$(git ls-files -u two | wc -l)" &&
        test 1 -eq "$(git ls-files -u original | wc -l)" &&
        test 0 -eq "$(git ls-files -o | wc -l)" &&

        test -f one &&
        test -f two &&
        ! test -f 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 =1000000000 rename &&
        test-tool chmtime -v +0 rename >expect &&
        git merge merge-branch-1 &&
        test-tool chmtime -v +0 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 =1000000000 df &&
        test-tool chmtime -v +0 df >expect &&
        git merge merge-branch-2 &&
        test-tool chmtime -v +0 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 master &&
        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 master^0 &&
        test-tool chmtime =1000000000 df &&
        test-tool chmtime -v +0 df >expect &&
        git merge side &&
        test-tool chmtime -v +0 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 master &&
        echo bla >file &&
        git add -A &&
        git commit -m "Modify file"
'

test_expect_success 'avoid unnecessary update, modify/delete' '
        git checkout -q master^0 &&
        test-tool chmtime =1000000000 file &&
        test-tool chmtime -v +0 file >expect &&
        test_must_fail git merge side &&
        test-tool chmtime -v +0 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 master &&
        git mv file newfile &&
        git commit -m "Rename file"
'

test_expect_success 'avoid unnecessary update, rename/add-dest' '
        git checkout -q master^0 &&
        test-tool chmtime =1000000000 newfile &&
        test-tool chmtime -v +0 newfile >expect &&
        git merge side &&
        test-tool chmtime -v +0 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 1 -eq $(git ls-files -s | wc -l) &&
        test 0 -eq $(git ls-files -o | wc -l) &&
        test $(git rev-parse HEAD:renamed_file) = $(git rev-parse HEAD~1:file)
'

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 master &&
        echo 8.5 >>original_file &&
        git add original_file &&
        git commit -mC
'

cat >expected <<\EOF &&
1
2
3
4
5
6
7
8
<<<<<<< HEAD:renamed_file
9
=======
8.5
>>>>>>> master^0:original_file
EOF

test_expect_success 'merge master into rename has correct extended markers' '
        git checkout rename^0 &&
        test_must_fail git merge -s recursive master^0 &&
        test_cmp expected renamed_file
'

cat >expected <<\EOF &&
1
2
3
4
5
6
7
8
<<<<<<< HEAD:original_file
8.5
=======
9
>>>>>>> rename^0:renamed_file
EOF

test_expect_success 'merge rename into master has correct extended markers' '
        git reset --hard &&
        git checkout master^0 &&
        test_must_fail git merge -s recursive rename^0 &&
        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 master &&
        git rm original_file &&
        git commit -mC
'

test_expect_success 'no spurious "refusing to lose untracked" message' '
        git checkout master^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 &&
        >expect &&
        test_cmp expect empty2
'

test_done