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-rwxr-xr-xt/t6436-merge-overwrite.sh207
1 files changed, 207 insertions, 0 deletions
diff --git a/t/t6436-merge-overwrite.sh b/t/t6436-merge-overwrite.sh
new file mode 100755
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+++ b/t/t6436-merge-overwrite.sh
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+#!/bin/sh
+
+test_description='git-merge
+
+Do not overwrite changes.'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ test_commit c0 c0.c &&
+ test_commit c1 c1.c &&
+ test_commit c1a c1.c "c1 a" &&
+ git reset --hard c0 &&
+ test_commit c2 c2.c &&
+ git reset --hard c0 &&
+ mkdir sub &&
+ echo "sub/f" > sub/f &&
+ mkdir sub2 &&
+ echo "sub2/f" > sub2/f &&
+ git add sub/f sub2/f &&
+ git commit -m sub &&
+ git tag sub &&
+ echo "VERY IMPORTANT CHANGES" > important
+'
+
+test_expect_success 'will not overwrite untracked file' '
+ git reset --hard c1 &&
+ cp important c2.c &&
+ test_must_fail git merge c2 &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important c2.c
+'
+
+test_expect_success 'will overwrite tracked file' '
+ git reset --hard c1 &&
+ cp important c2.c &&
+ git add c2.c &&
+ git commit -m important &&
+ git checkout c2
+'
+
+test_expect_success 'will not overwrite new file' '
+ git reset --hard c1 &&
+ cp important c2.c &&
+ git add c2.c &&
+ test_must_fail git merge c2 &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important c2.c
+'
+
+test_expect_success 'will not overwrite staged changes' '
+ git reset --hard c1 &&
+ cp important c2.c &&
+ git add c2.c &&
+ rm c2.c &&
+ test_must_fail git merge c2 &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ git checkout c2.c &&
+ test_cmp important c2.c
+'
+
+test_expect_success 'will not overwrite removed file' '
+ git reset --hard c1 &&
+ git rm c1.c &&
+ git commit -m "rm c1.c" &&
+ cp important c1.c &&
+ test_must_fail git merge c1a &&
+ test_cmp important c1.c &&
+ rm c1.c # Do not leave untracked file in way of future tests
+'
+
+test_expect_success 'will not overwrite re-added file' '
+ git reset --hard c1 &&
+ git rm c1.c &&
+ git commit -m "rm c1.c" &&
+ cp important c1.c &&
+ git add c1.c &&
+ test_must_fail git merge c1a &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important c1.c
+'
+
+test_expect_success 'will not overwrite removed file with staged changes' '
+ git reset --hard c1 &&
+ git rm c1.c &&
+ git commit -m "rm c1.c" &&
+ cp important c1.c &&
+ git add c1.c &&
+ rm c1.c &&
+ test_must_fail git merge c1a &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ git checkout c1.c &&
+ test_cmp important c1.c
+'
+
+test_expect_success 'will not overwrite unstaged changes in renamed file' '
+ git reset --hard c1 &&
+ git mv c1.c other.c &&
+ git commit -m rename &&
+ cp important other.c &&
+ if test "$GIT_TEST_MERGE_ALGORITHM" = ort
+ then
+ test_must_fail git merge c1a >out 2>err &&
+ test_i18ngrep "would be overwritten by merge" err &&
+ test_cmp important other.c &&
+ test_path_is_missing .git/MERGE_HEAD
+ else
+ test_must_fail git merge c1a >out &&
+ test_i18ngrep "Refusing to lose dirty file at other.c" out &&
+ test_path_is_file other.c~HEAD &&
+ test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
+ test_cmp important other.c
+ fi
+'
+
+test_expect_success 'will not overwrite untracked subtree' '
+ git reset --hard c0 &&
+ rm -rf sub &&
+ mkdir -p sub/f &&
+ cp important sub/f/important &&
+ test_must_fail git merge sub &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important sub/f/important
+'
+
+cat >expect <<\EOF
+error: The following untracked working tree files would be overwritten by merge:
+ sub
+ sub2
+Please move or remove them before you merge.
+Aborting
+EOF
+
+test_expect_success 'will not overwrite untracked file in leading path' '
+ git reset --hard c0 &&
+ rm -rf sub &&
+ cp important sub &&
+ cp important sub2 &&
+ test_must_fail git merge sub 2>out &&
+ test_cmp out expect &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important sub &&
+ test_cmp important sub2 &&
+ rm -f sub sub2
+'
+
+test_expect_success SYMLINKS 'will not overwrite untracked symlink in leading path' '
+ git reset --hard c0 &&
+ rm -rf sub &&
+ mkdir sub2 &&
+ ln -s sub2 sub &&
+ test_must_fail git merge sub &&
+ test_path_is_missing .git/MERGE_HEAD
+'
+
+test_expect_success 'will not be confused by symlink in leading path' '
+ git reset --hard c0 &&
+ rm -rf sub &&
+ test_ln_s_add sub2 sub &&
+ git commit -m ln &&
+ git checkout sub
+'
+
+cat >expect <<\EOF
+error: Untracked working tree file 'c0.c' would be overwritten by merge.
+fatal: read-tree failed
+EOF
+
+test_expect_success 'will not overwrite untracked file on unborn branch' '
+ git reset --hard c0 &&
+ git rm -fr . &&
+ git checkout --orphan new &&
+ cp important c0.c &&
+ test_must_fail git merge c0 2>out &&
+ test_cmp out expect
+'
+
+test_expect_success 'will not overwrite untracked file on unborn branch .git/MERGE_HEAD sanity etc.' '
+ test_when_finished "rm c0.c" &&
+ test_path_is_missing .git/MERGE_HEAD &&
+ test_cmp important c0.c
+'
+
+test_expect_success 'failed merge leaves unborn branch in the womb' '
+ test_must_fail git rev-parse --verify HEAD
+'
+
+test_expect_success 'set up unborn branch and content' '
+ git symbolic-ref HEAD refs/heads/unborn &&
+ rm -f .git/index &&
+ echo foo > tracked-file &&
+ git add tracked-file &&
+ echo bar > untracked-file
+'
+
+test_expect_success 'will not clobber WT/index when merging into unborn' '
+ git merge main &&
+ grep foo tracked-file &&
+ git show :tracked-file >expect &&
+ grep foo expect &&
+ grep bar untracked-file
+'
+
+test_done