do not overwrite untracked symlinks

Git traditionally overwrites untracked symlinks silently. This will
generally not cause massive data loss, but it is inconsistent with
the behavior for regular files, which are not silently overwritten.

With this change, git refuses to overwrite untracked symlinks by
default. If the user really wants to overwrite the untracked
symlink, he has git-clean and git-checkout -f at his disposal.

Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/symlinks.c b/symlinks.c
index 3cacebd91adc2958e81d952523bd7cfe0078078c..034943bda0e8be781f4a7568f0dbb5b1958f7e15 100644 (file)
--- a/symlinks.c
+++ b/symlinks.c
@@ -223,7 +223,7 @@ int check_leading_path(const char *name, int len)
        int flags;
        int match_len = lstat_cache_matchlen(cache, name, len, &flags,
                           FL_SYMLINK|FL_NOENT|FL_DIR, USE_ONLY_LSTAT);
-       if (flags & (FL_SYMLINK|FL_NOENT))
+       if (flags & FL_NOENT)
                return 0;
        else if (flags & FL_DIR)
                return -1;

diff --git a/t/t6035-merge-dir-to-symlink.sh b/t/t6035-merge-dir-to-symlink.sh
index 92e02d5d77501b2a3ff52069931a534fc7bb24fd..2599ae50eb94051f66b4dc1de603aaf8cd1f79eb 100755 (executable)
--- a/t/t6035-merge-dir-to-symlink.sh
+++ b/t/t6035-merge-dir-to-symlink.sh
@@ -17,13 +17,21 @@ test_expect_success SYMLINKS 'create a commit where dir a/b changed to symlink'
        git commit -m "dir to symlink"
 '
 
-test_expect_success SYMLINKS 'keep a/b-2/c/d across checkout' '
+test_expect_success SYMLINKS 'checkout does not clobber untracked symlink' '
        git checkout HEAD^0 &&
        git reset --hard master &&
        git rm --cached a/b &&
        git commit -m "untracked symlink remains" &&
-        git checkout start^0 &&
-        test -f a/b-2/c/d
+       test_must_fail git checkout start^0
+'
+
+test_expect_success SYMLINKS 'a/b-2/c/d is kept when clobbering symlink b' '
+       git checkout HEAD^0 &&
+       git reset --hard master &&
+       git rm --cached a/b &&
+       git commit -m "untracked symlink remains" &&
+       git checkout -f start^0 &&
+       test -f a/b-2/c/d
 '
 
 test_expect_success SYMLINKS 'checkout should not have deleted a/b-2/c/d' '