symlinks: do not include startup_info->original_cwd in dir removal

symlinks has a pair of schedule_dir_for_removal() and
remove_scheduled_dirs() functions that ensure that directories made
empty by removing other files also themselves get removed.  However, we
want to exclude startup_info->original_cwd and leave it around.  This
avoids the user getting confused by subsequent git commands (and non-git
commands) that would otherwise report confusing messages about being
unable to read the current working directory.

Acked-by: Derrick Stolee <stolee@gmail.com>
Acked-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

symlinks.c

@@ -279,7 +279,9 @@ static void do_remove_scheduled_dirs(int new_len)
 {
 	while (removal.len > new_len) {
 		removal.buf[removal.len] = '\0';
-		if (rmdir(removal.buf))
+		if ((startup_info->original_cwd &&
+		     !strcmp(removal.buf, startup_info->original_cwd)) ||
+		    rmdir(removal.buf))
 			break;
 		do {
 			removal.len--;
@@ -293,6 +295,10 @@ void schedule_dir_for_removal(const char *name, int len)
 {
 	int match_len, last_slash, i, previous_slash;
 
+	if (startup_info->original_cwd &&
+	    !strcmp(name, startup_info->original_cwd))
+		return;	/* Do not remove the current working directory */
+
 	match_len = last_slash = i =
 		longest_path_match(name, len, removal.buf, removal.len,
 				   &previous_slash);

t/t2501-cwd-empty.sh

@@ -109,7 +109,7 @@ test_required_dir_removal () {
 }
 
 test_expect_success 'checkout does not clean cwd incidentally' '
-	test_incidental_dir_removal failure git checkout init
+	test_incidental_dir_removal success git checkout init
 '
 
 test_expect_success 'checkout fails if cwd needs to be removed' '
@@ -117,7 +117,7 @@ test_expect_success 'checkout fails if cwd needs to be removed' '
 '
 
 test_expect_success 'reset --hard does not clean cwd incidentally' '
-	test_incidental_dir_removal failure git reset --hard init
+	test_incidental_dir_removal success git reset --hard init
 '
 
 test_expect_success 'reset --hard fails if cwd needs to be removed' '
@@ -125,7 +125,7 @@ test_expect_success 'reset --hard fails if cwd needs to be removed' '
 '
 
 test_expect_success 'merge does not clean cwd incidentally' '
-	test_incidental_dir_removal failure git merge reverted
+	test_incidental_dir_removal success git merge reverted
 '
 
 # This file uses some simple merges where
@@ -158,7 +158,7 @@ test_expect_success 'merge fails if cwd needs to be removed' '
 '
 
 test_expect_success 'cherry-pick does not clean cwd incidentally' '
-	test_incidental_dir_removal failure git cherry-pick reverted
+	test_incidental_dir_removal success git cherry-pick reverted
 '
 
 test_expect_success 'cherry-pick fails if cwd needs to be removed' '
@@ -174,7 +174,7 @@ test_expect_success 'rebase fails if cwd needs to be removed' '
 '
 
 test_expect_success 'revert does not clean cwd incidentally' '
-	test_incidental_dir_removal failure git revert HEAD
+	test_incidental_dir_removal success git revert HEAD
 '
 
 test_expect_success 'revert fails if cwd needs to be removed' '