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-rwxr-xr-xt/t6415-merge-dir-to-symlink.sh175
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diff --git a/t/t6415-merge-dir-to-symlink.sh b/t/t6415-merge-dir-to-symlink.sh
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+#!/bin/sh
+
+test_description='merging when a directory was replaced with a symlink'
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+test_expect_success 'create a commit where dir a/b changed to symlink' '
+ mkdir -p a/b/c a/b-2/c &&
+ > a/b/c/d &&
+ > a/b-2/c/d &&
+ > a/x &&
+ git add -A &&
+ git commit -m base &&
+ git tag start &&
+ rm -rf a/b &&
+ git add -A &&
+ test_ln_s_add b-2 a/b &&
+ git commit -m "dir to symlink"
+'
+
+test_expect_success 'checkout does not clobber untracked symlink' '
+ git checkout HEAD^0 &&
+ git reset --hard main &&
+ git rm --cached a/b &&
+ git commit -m "untracked symlink remains" &&
+ test_must_fail git checkout start^0
+'
+
+test_expect_success 'a/b-2/c/d is kept when clobbering symlink b' '
+ git checkout HEAD^0 &&
+ git reset --hard main &&
+ git rm --cached a/b &&
+ git commit -m "untracked symlink remains" &&
+ git checkout -f start^0 &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success 'checkout should not have deleted a/b-2/c/d' '
+ git checkout HEAD^0 &&
+ git reset --hard main &&
+ git checkout start^0 &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success 'setup for merge test' '
+ git reset --hard &&
+ test_path_is_file a/b-2/c/d &&
+ echo x > a/x &&
+ git add a/x &&
+ git commit -m x &&
+ git tag baseline
+'
+
+test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (resolve)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ git merge -s resolve main &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success SYMLINKS 'a/b was resolved as symlink' '
+ test -h a/b
+'
+
+test_expect_success 'Handle D/F conflict, do not lose a/b-2/c/d in merge (recursive)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ git merge -s recursive main &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success SYMLINKS 'a/b was resolved as symlink' '
+ test -h a/b
+'
+
+test_expect_success 'Handle F/D conflict, do not lose a/b-2/c/d in merge (resolve)' '
+ git reset --hard &&
+ git checkout main^0 &&
+ git merge -s resolve baseline^0 &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success SYMLINKS 'a/b was resolved as symlink' '
+ test -h a/b
+'
+
+test_expect_success 'Handle F/D conflict, do not lose a/b-2/c/d in merge (recursive)' '
+ git reset --hard &&
+ git checkout main^0 &&
+ git merge -s recursive baseline^0 &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success SYMLINKS 'a/b was resolved as symlink' '
+ test -h a/b
+'
+
+test_expect_failure 'do not lose untracked in merge (resolve)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ >a/b/c/e &&
+ test_must_fail git merge -s resolve main &&
+ test_path_is_file a/b/c/e &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success 'do not lose untracked in merge (recursive)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ >a/b/c/e &&
+ test_must_fail git merge -s recursive main &&
+ test_path_is_file a/b/c/e &&
+ test_path_is_file a/b-2/c/d
+'
+
+test_expect_success 'do not lose modifications in merge (resolve)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ echo more content >>a/b/c/d &&
+ test_must_fail git merge -s resolve main
+'
+
+test_expect_success 'do not lose modifications in merge (recursive)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ echo more content >>a/b/c/d &&
+ test_must_fail git merge -s recursive main
+'
+
+test_expect_success 'setup a merge where dir a/b-2 changed to symlink' '
+ git reset --hard &&
+ git checkout start^0 &&
+ rm -rf a/b-2 &&
+ git add -A &&
+ test_ln_s_add b a/b-2 &&
+ git commit -m "dir a/b-2 to symlink" &&
+ git tag test2
+'
+
+test_expect_success 'merge should not have D/F conflicts (resolve)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ git merge -s resolve test2 &&
+ test_path_is_file a/b/c/d
+'
+
+test_expect_success SYMLINKS 'a/b-2 was resolved as symlink' '
+ test -h a/b-2
+'
+
+test_expect_success 'merge should not have D/F conflicts (recursive)' '
+ git reset --hard &&
+ git checkout baseline^0 &&
+ git merge -s recursive test2 &&
+ test_path_is_file a/b/c/d
+'
+
+test_expect_success SYMLINKS 'a/b-2 was resolved as symlink' '
+ test -h a/b-2
+'
+
+test_expect_success 'merge should not have F/D conflicts (recursive)' '
+ git reset --hard &&
+ git checkout -b foo test2 &&
+ git merge -s recursive baseline^0 &&
+ test_path_is_file a/b/c/d
+'
+
+test_expect_success SYMLINKS 'a/b-2 was resolved as symlink' '
+ test -h a/b-2
+'
+
+test_done