submodule: fix regression for deinit without submodules

Per Cederqvist wrote:
> It used to be possible to run
>
>    git submodule deinit -f .
>
> to remove any submodules, no matter how many submodules you had.  That
> is no longer possible in projects that don't have any submodules at
> all.  The command will fail with:
>
>     error: pathspec '.' did not match any file(s) known to git.

This regression was introduced in 74703a1 (submodule: rewrite
`module_list` shell function in C, 2015-09-02), as we changed the
order of checking in new module listing to first check whether it is
a gitlin before feeding it to match_pathspec().  It used to be that
a pathspec that does not match any path were diagnosed as an error,
but the new code complains for a pathspec that does not match any
submodule path.

Arguably the new behaviour may give us a better diagnosis, but that
is inconsistent with the suggestion "deinit" gives, and also this
was an unintended accident.  The new behaviour hopefully can be
redesigned and implemented better in future releases, but for now,
switch these two checks to restore the same behavior as before.  In
an empty repository, giving the pathspec '.' will still get the same
"did not match" error, but that is the same bug we had before 1.7.0.

Reported-by: Per Cederqvist <cederp@opera.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/submodule--helper.c

@@ -37,9 +37,9 @@ static int module_list_compute(int argc, const char **argv,
 	for (i = 0; i < active_nr; i++) {
 		const struct cache_entry *ce = active_cache[i];
 
-		if (!S_ISGITLINK(ce->ce_mode) ||
-		    !match_pathspec(pathspec, ce->name, ce_namelen(ce),
-				    0, ps_matched, 1))
+		if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
+				    0, ps_matched, 1) ||
+		    !S_ISGITLINK(ce->ce_mode))
 			continue;
 
 		ALLOC_GROW(list->entries, list->nr + 1, list->alloc);

t/t7400-submodule-basic.sh

@@ -849,6 +849,19 @@ test_expect_success 'set up a second submodule' '
 	git commit -m "submodule example2 added"
 '
 
+test_expect_success 'submodule deinit works on repository without submodules' '
+	test_when_finished "rm -rf newdirectory" &&
+	mkdir newdirectory &&
+	(
+		cd newdirectory &&
+		git init &&
+		>file &&
+		git add file &&
+		git commit -m "repo should not be empty"
+		git submodule deinit .
+	)
+'
+
 test_expect_success 'submodule deinit should remove the whole submodule section from .git/config' '
 	git config submodule.example.foo bar &&
 	git config submodule.example2.frotz nitfol &&