ls-files: fix overeager pathspec optimization

Given pathspecs that share a common prefix, ls-files optimized its call
into recursive directory reader by starting at the common prefix
directory.

If you have a directory "t" with an untracked file "t/junk" in it, but the
top-level .gitignore file told us to ignore "t/", this resulted in:

    $ git ls-files -o --exclude-standard
    $ git ls-files -o --exclude-standard t/
    t/junk
    $ git ls-files -o --exclude-standard t/junk
    t/junk
    $ cd t && git ls-files -o --exclude-standard
    junk

We could argue that you are overriding the ignore file by giving a
patchspec that matches or being in that directory, but it is somewhat
unexpected.  Worse yet, these behave differently:

    $ git ls-files -o --exclude-standard t/ .
    $ git ls-files -o --exclude-standard t/
    t/junk

This patch changes the optimization so that it notices when the common
prefix directory that it starts reading from is an ignored one.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/dir.c b/dir.c
index 35cc89b07e0bce8cb0ac5227640e5a9da9830415..00d698d79f8133549a0269b2c0477b2792917aaa 100644 (file)
--- a/dir.c
+++ b/dir.c
@@ -813,6 +813,41 @@ static void free_simplify(struct path_simplify *simplify)
        free(simplify);
 }
 
+static int treat_leading_path(struct dir_struct *dir,
+                             const char *path, int len,
+                             const struct path_simplify *simplify)
+{
+       char pathbuf[PATH_MAX];
+       int baselen, blen;
+       const char *cp;
+
+       while (len && path[len - 1] == '/')
+               len--;
+       if (!len)
+               return 1;
+       baselen = 0;
+       while (1) {
+               cp = path + baselen + !!baselen;
+               cp = memchr(cp, '/', path + len - cp);
+               if (!cp)
+                       baselen = len;
+               else
+                       baselen = cp - path;
+               memcpy(pathbuf, path, baselen);
+               pathbuf[baselen] = '\0';
+               if (!is_directory(pathbuf))
+                       return 0;
+               if (simplify_away(pathbuf, baselen, simplify))
+                       return 0;
+               blen = baselen;
+               if (treat_one_path(dir, pathbuf, &blen, simplify,
+                                  DT_DIR, NULL) == path_ignored)
+                       return 0; /* do not recurse into it */
+               if (len <= baselen)
+                       return 1; /* finished checking */
+       }
+}
+
 int read_directory(struct dir_struct *dir, const char *path, int len, const char **pathspec)
 {
        struct path_simplify *simplify;
@@ -821,7 +856,8 @@ int read_directory(struct dir_struct *dir, const char *path, int len, const char
                return dir->nr;
 
        simplify = create_simplify(pathspec);
-       read_directory_recursive(dir, path, len, 0, simplify);
+       if (!len || treat_leading_path(dir, path, len, simplify))
+               read_directory_recursive(dir, path, len, 0, simplify);
        free_simplify(simplify);
        qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
        qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);

diff --git a/t/t3001-ls-files-others-exclude.sh b/t/t3001-ls-files-others-exclude.sh
index e3e4d714a1d9c27dc15b04dbad253c85dff71d97..9e71260ad04f6527f9030c14b6159fb37cbeaaad 100755 (executable)
--- a/t/t3001-ls-files-others-exclude.sh
+++ b/t/t3001-ls-files-others-exclude.sh
@@ -183,7 +183,7 @@ test_expect_success 'subdirectory ignore (l1/l2)' '
        test_cmp expect actual
 '
 
-test_expect_failure 'subdirectory ignore (l1)' '
+test_expect_success 'subdirectory ignore (l1)' '
        (
                cd top/l1 &&
                git ls-files -o --exclude-standard