[PATCH v3 20/23] update-index: test the system before enabling untracked cache
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 */
--
2.2.0.60.gb7b3c64
Nguyễn Thái Ngọc Duy <pclouds@gmail.com>