[PATCH v2 19/22] update-index: test the system before enabling untracked cache

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Documentation/git-update-index.txt |   6 ++
 builtin/update-index.c             | 148 +++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index f9a35cd..ed32bae 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -180,6 +180,12 @@ may not support it yet.
 	system must change `st_mtime` field of a directory if files
 	are added or deleted in that directory.
 
+--force-untracked-cache::
+	For safety, `--untracked-cache` performs tests on the working
+	directory to make sure untracked cache can be used. These
+	tests can take a few seconds. `--force-untracked-cache` can be
+	used to skip the tests.
+
 \--::
 	Do not interpret any more arguments as options.
 
diff --git a/builtin/update-index.c b/builtin/update-index.c
index 3d2dedd..f23ec83 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -47,6 +47,147 @@ static void report(const char *fmt, ...)
 	va_end(vp);
 }
 
+static void remove_test_directory(void)
+{
+	struct strbuf sb = STRBUF_INIT;
+	strbuf_addstr(&sb, "dir-mtime-test");
+	remove_dir_recursively(&sb, 0);
+	strbuf_release(&sb);
+}
+
+static void xmkdir(const char *path)
+{
+	if (mkdir(path, 0700))
+		die_errno(_("failed to create directory %s"), path);
+}
+
+static int xstat(const char *path, struct stat *st)
+{
+	if (stat(path, st))
+		die_errno(_("failed to stat %s"), path);
+	return 0;
+}
+
+static int create_file(const char *path)
+{
+	int fd = open(path, O_CREAT | O_RDWR, 0644);
+	if (fd < 0)
+		die_errno(_("failed to create file %s"), path);
+	return fd;
+}
+
+static void xunlink(const char *path)
+{
+	if (unlink(path))
+		die_errno(_("failed to delete file %s"), path);
+}
+
+static void xrmdir(const char *path)
+{
+	if (rmdir(path))
+		die_errno(_("failed to delete directory %s"), path);
+}
+
+static void avoid_racy(void)
+{
+	/*
+	 * not use if we could usleep(10) if USE_NSEC is defined. The
+	 * field nsec could be there, but the OS could choose to
+	 * ignore it?
+	 */
+	sleep(1);
+}
+
+static int test_if_untracked_cache_is_supported(void)
+{
+	struct stat st;
+	struct stat_data base;
+	int fd;
+
+	fprintf(stderr, _("Testing "));
+	xmkdir("dir-mtime-test");
+	atexit(remove_test_directory);
+	xstat("dir-mtime-test", &st);
+	fill_stat_data(&base, &st);
+	fputc('.', stderr);
+
+	avoid_racy();
+	fd = create_file("dir-mtime-test/newfile");
+	xstat("dir-mtime-test", &st);
+	if (!match_stat_data(&base, &st)) {
+		close(fd);
+		fputc('\n', stderr);
+		fprintf_ln(stderr,_("directory stat info does not "
+				    "change after adding a new file"));
+		return 0;
+	}
+	fill_stat_data(&base, &st);
+	fputc('.', stderr);
+
+	avoid_racy();
+	xmkdir("dir-mtime-test/new-dir");
+	xstat("dir-mtime-test", &st);
+	if (!match_stat_data(&base, &st)) {
+		close(fd);
+		fputc('\n', stderr);
+		fprintf_ln(stderr, _("directory stat info does not change "
+				     "after adding a new directory"));
+		return 0;
+	}
+	fill_stat_data(&base, &st);
+	fputc('.', stderr);
+
+	avoid_racy();
+	write_or_die(fd, "data", 4);
+	close(fd);
+	xstat("dir-mtime-test", &st);
+	if (match_stat_data(&base, &st)) {
+		fputc('\n', stderr);
+		fprintf_ln(stderr, _("directory stat info changes "
+				     "after updating a file"));
+		return 0;
+	}
+	fputc('.', stderr);
+
+	avoid_racy();
+	close(create_file("dir-mtime-test/new-dir/new"));
+	xstat("dir-mtime-test", &st);
+	if (match_stat_data(&base, &st)) {
+		fputc('\n', stderr);
+		fprintf_ln(stderr, _("directory stat info changes after "
+				     "adding a file inside subdirectory"));
+		return 0;
+	}
+	fputc('.', stderr);
+
+	avoid_racy();
+	xunlink("dir-mtime-test/newfile");
+	xstat("dir-mtime-test", &st);
+	if (!match_stat_data(&base, &st)) {
+		fputc('\n', stderr);
+		fprintf_ln(stderr, _("directory stat info does not "
+				     "change after deleting a file"));
+		return 0;
+	}
+	fill_stat_data(&base, &st);
+	fputc('.', stderr);
+
+	avoid_racy();
+	xunlink("dir-mtime-test/new-dir/new");
+	xrmdir("dir-mtime-test/new-dir");
+	xstat("dir-mtime-test", &st);
+	if (!match_stat_data(&base, &st)) {
+		fputc('\n', stderr);
+		fprintf_ln(stderr, _("directory stat info does not "
+				     "change after deleting a directory"));
+		return 0;
+	}
+
+	xrmdir("dir-mtime-test");
+	fprintf_ln(stderr, _(" OK"));
+	return 1;
+}
+
 static int mark_ce_flags(const char *path, int flag, int mark)
 {
 	int namelen = strlen(path);
@@ -834,6 +975,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 			N_("enable or disable split index")),
 		OPT_BOOL(0, "untracked-cache", &untracked_cache,
 			N_("enable/disable untracked cache")),
+		OPT_SET_INT(0, "force-untracked-cache", &untracked_cache,
+			    N_("enable untracked cache without testing the filesystem"), 2),
 		OPT_END()
 	};
 
@@ -943,6 +1086,11 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 	if (untracked_cache > 0 && !the_index.untracked) {
 		struct untracked_cache *uc;
 
+		if (untracked_cache < 2) {
+			setup_work_tree();
+			if (!test_if_untracked_cache_is_supported())
+				return 1;
+		}
 		uc = xcalloc(1, sizeof(*uc));
 		uc->exclude_per_dir = ".gitignore";
 		/* should be the same flags used by git-status */
-- 
2.1.0.rc0.78.gc0d8480