Code changes are all in 20/24, to avoid hard coding the test path. The
rest is documentation changes.

-- 8<--
diff --git a/Documentation/git-status.txt b/Documentation/git-status.txt
index 7850f53..4dcad4e 100644
--- a/Documentation/git-status.txt
+++ b/Documentation/git-status.txt
@@ -59,7 +59,7 @@ shown (i.e. the same as specifying `normal`), to help you 
avoid
 forgetting to add newly created files.  Because it takes extra work
 to find untracked files in the filesystem, this mode may take some
 time in a large working tree.
-Consider to enable untracked cache and split index if supported (see
+Consider enabling untracked cache and split index if supported (see
 `git update-index --untracked-cache` and `git update-index
 --split-index`), Otherwise you can use `no` to have `git status`
 return more quickly without showing untracked files.
diff --git a/Documentation/technical/index-format.txt 
b/Documentation/technical/index-format.txt
index 0045b89..e24b4bc 100644
--- a/Documentation/technical/index-format.txt
+++ b/Documentation/technical/index-format.txt
@@ -269,9 +269,9 @@ Git index format
   - A number of directory blocks in depth-first-search order, each
     consists of
 
-    - The number of untracked entries, variable witdh encoding.
+    - The number of untracked entries, variable width encoding.
 
-    - The number of sub-directory blocks, variable with encoding.
+    - The number of sub-directory blocks, variable width encoding.
 
     - The directory name terminated by NUL.
 
diff --git a/builtin/update-index.c b/builtin/update-index.c
index e76740d..fc5e108 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -32,6 +32,7 @@ static int mark_valid_only;
 static int mark_skip_worktree_only;
 #define MARK_FLAG 1
 #define UNMARK_FLAG 2
+static struct strbuf mtime_dir = STRBUF_INIT;
 
 __attribute__((format (printf, 1, 2)))
 static void report(const char *fmt, ...)
@@ -49,28 +50,37 @@ static void report(const char *fmt, ...)
 
 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);
+       if (mtime_dir.len)
+               remove_dir_recursively(&mtime_dir, 0);
+}
+
+static const char *get_mtime_path(const char *path)
+{
+       static struct strbuf sb = STRBUF_INIT;
+       strbuf_reset(&sb);
+       strbuf_addf(&sb, "%s/%s", mtime_dir.buf, path);
+       return sb.buf;
 }
 
 static void xmkdir(const char *path)
 {
+       path = get_mtime_path(path);
        if (mkdir(path, 0700))
                die_errno(_("failed to create directory %s"), path);
 }
 
-static int xstat(const char *path, struct stat *st)
+static int xstat_mtime_dir(struct stat *st)
 {
-       if (stat(path, st))
-               die_errno(_("failed to stat %s"), path);
+       if (stat(mtime_dir.buf, st))
+               die_errno(_("failed to stat %s"), mtime_dir.buf);
        return 0;
 }
 
 static int create_file(const char *path)
 {
-       int fd = open(path, O_CREAT | O_RDWR, 0644);
+       int fd;
+       path = get_mtime_path(path);
+       fd = open(path, O_CREAT | O_RDWR, 0644);
        if (fd < 0)
                die_errno(_("failed to create file %s"), path);
        return fd;
@@ -78,12 +88,14 @@ static int create_file(const char *path)
 
 static void xunlink(const char *path)
 {
+       path = get_mtime_path(path);
        if (unlink(path))
                die_errno(_("failed to delete file %s"), path);
 }
 
 static void xrmdir(const char *path)
 {
+       path = get_mtime_path(path);
        if (rmdir(path))
                die_errno(_("failed to delete directory %s"), path);
 }
@@ -102,37 +114,40 @@ static int test_if_untracked_cache_is_supported(void)
 {
        struct stat st;
        struct stat_data base;
-       int fd;
+       int fd, ret = 0;
+
+       strbuf_addstr(&mtime_dir, "mtime-test-XXXXXX");
+       if (!mkdtemp(mtime_dir.buf))
+               die_errno("Could not make temporary directory");
 
        fprintf(stderr, _("Testing "));
-       xmkdir("dir-mtime-test");
        atexit(remove_test_directory);
-       xstat("dir-mtime-test", &st);
+       xstat_mtime_dir(&st);
        fill_stat_data(&base, &st);
        fputc('.', stderr);
 
        avoid_racy();
-       fd = create_file("dir-mtime-test/newfile");
-       xstat("dir-mtime-test", &st);
+       fd = create_file("newfile");
+       xstat_mtime_dir(&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;
+               goto done;
        }
        fill_stat_data(&base, &st);
        fputc('.', stderr);
 
        avoid_racy();
-       xmkdir("dir-mtime-test/new-dir");
-       xstat("dir-mtime-test", &st);
+       xmkdir("new-dir");
+       xstat_mtime_dir(&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;
+               goto done;
        }
        fill_stat_data(&base, &st);
        fputc('.', stderr);
@@ -140,52 +155,57 @@ static int test_if_untracked_cache_is_supported(void)
        avoid_racy();
        write_or_die(fd, "data", 4);
        close(fd);
-       xstat("dir-mtime-test", &st);
+       xstat_mtime_dir(&st);
        if (match_stat_data(&base, &st)) {
                fputc('\n', stderr);
                fprintf_ln(stderr, _("directory stat info changes "
                                     "after updating a file"));
-               return 0;
+               goto done;
        }
        fputc('.', stderr);
 
        avoid_racy();
-       close(create_file("dir-mtime-test/new-dir/new"));
-       xstat("dir-mtime-test", &st);
+       close(create_file("new-dir/new"));
+       xstat_mtime_dir(&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;
+               goto done;
        }
        fputc('.', stderr);
 
        avoid_racy();
-       xunlink("dir-mtime-test/newfile");
-       xstat("dir-mtime-test", &st);
+       xunlink("newfile");
+       xstat_mtime_dir(&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;
+               goto done;
        }
        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);
+       xunlink("new-dir/new");
+       xrmdir("new-dir");
+       xstat_mtime_dir(&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;
+               goto done;
        }
 
-       xrmdir("dir-mtime-test");
+       if (rmdir(mtime_dir.buf))
+               die_errno(_("failed to delete directory %s"), mtime_dir.buf);
        fprintf_ln(stderr, _(" OK"));
-       return 1;
+       ret = 1;
+
+done:
+       strbuf_release(&mtime_dir);
+       return ret;
 }
 
 static int mark_ce_flags(const char *path, int flag, int mark)
-- 8<--
-- 
2.3.0.rc1.137.g477eb31

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