grep: turn off gitlink detection for --no-index

If we are running "git grep --no-index" outside of a git
repository, we behave roughly like "grep -r", examining all
files in the current directory and its subdirectories.
However, because we use fill_directory() to do the
recursion, it will skip over any directories which look like
sub-repositories.

For a normal git operation (like "git grep" in a repository)
this makes sense; we do not want to cross the boundary out
of our current repository into a submodule. But for
"--no-index" without a repository, we should look at all
files, including embedded repositories.

There is one exception, though: we probably should _not_
descend into ".git" directories. Doing so is inefficient and
unlikely to turn up useful hits.

This patch drops our use of dir.c's gitlink-detection, but
we do still avoid ".git". That makes us more like tools such
as "ack" or "ag", which also know to avoid cruft in .git.

As a bonus, this also drops our usage of the ref code
when we are outside of a repository, making the transition
to pluggable ref backends cleaner.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/grep.c b/builtin/grep.c
index aa7435f380e95d87982cd1ae71e91bc53e77af50..111b6f6cf1a61b0fb481101fcdc5a9f3f48c4650 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -522,12 +522,14 @@ static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 }
 
 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
-                         int exc_std)
+                         int exc_std, int use_index)
 {
        struct dir_struct dir;
        int i, hit = 0;
 
        memset(&dir, 0, sizeof(dir));
+       if (!use_index)
+               dir.flags |= DIR_NO_GITLINKS;
        if (exc_std)
                setup_standard_excludes(&dir);
 
@@ -902,7 +904,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
                int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
                if (list.nr)
                        die(_("--no-index or --untracked cannot be used with revs."));
-               hit = grep_directory(&opt, &pathspec, use_exclude);
+               hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
        } else if (0 <= opt_exclude) {
                die(_("--[no-]exclude-standard cannot be used for tracked contents."));
        } else if (!list.nr) {

diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index b540944408a6feb35f28ff7e18601db7a29f8635..1e72971a165efc127e6bda24fb0e4a3852d3c543 100755 (executable)
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -905,6 +905,33 @@ test_expect_success 'inside git repository but with --no-index' '
        )
 '
 
+test_expect_success 'grep --no-index descends into repos, but not .git' '
+       rm -fr non &&
+       mkdir -p non/git &&
+       (
+               GIT_CEILING_DIRECTORIES="$(pwd)/non" &&
+               export GIT_CEILING_DIRECTORIES &&
+               cd non/git &&
+
+               echo magic >file &&
+               git init repo &&
+               (
+                       cd repo &&
+                       echo magic >file &&
+                       git add file &&
+                       git commit -m foo &&
+                       echo magic >.git/file
+               ) &&
+
+               cat >expect <<-\EOF &&
+               file
+               repo/file
+               EOF
+               git grep -l --no-index magic >actual &&
+               test_cmp expect actual
+       )
+'
+
 test_expect_success 'setup double-dash tests' '
 cat >double-dash <<EOF &&
 --