It is nice to just be able to test if untracked cache is
supported without enabling it.

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 Documentation/git-update-index.txt | 9 ++++++++-
 builtin/update-index.c             | 5 +++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-update-index.txt 
b/Documentation/git-update-index.txt
index f4e5a85..a0ee0c9 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -18,7 +18,7 @@ SYNOPSIS
             [--[no-]skip-worktree]
             [--ignore-submodules]
             [--[no-]split-index]
-            [--[no-|force-]untracked-cache]
+            [--[no-|test-|force-]untracked-cache]
             [--really-refresh] [--unresolve] [--again | -g]
             [--info-only] [--index-info]
             [-z] [--stdin] [--index-version <n>]
@@ -180,6 +180,13 @@ may not support it yet.
        system must change `st_mtime` field of a directory if files
        are added or deleted in that directory.
 
+--test-untracked-cache::
+       Only perform tests on the working directory to make sure
+       untracked cache can be used. You have to manually enable
+       untracked cache using `--force-untracked-cache` (or
+       `--untracked-cache` but this will run the tests again)
+       afterwards if you really want to use it.
+
 --force-untracked-cache::
        For safety, `--untracked-cache` performs tests on the working
        directory to make sure untracked cache can be used. These
diff --git a/builtin/update-index.c b/builtin/update-index.c
index 1e546a3..62222dd 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -40,6 +40,7 @@ enum uc_mode {
        UC_UNSPECIFIED = -1,
        UC_DISABLE = 0,
        UC_ENABLE,
+       UC_TEST,
        UC_FORCE
 };
 
@@ -1004,6 +1005,8 @@ 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, "test-untracked-cache", &untracked_cache,
+                           N_("test if the filesystem supports untracked 
cache"), UC_TEST),
                OPT_SET_INT(0, "force-untracked-cache", &untracked_cache,
                            N_("enable untracked cache without testing the 
filesystem"), UC_FORCE),
                OPT_END()
@@ -1119,6 +1122,8 @@ int cmd_update_index(int argc, const char **argv, const 
char *prefix)
                        setup_work_tree();
                        if (!test_if_untracked_cache_is_supported())
                                return 1;
+                       if (untracked_cache == UC_TEST)
+                               return 0;
                }
                if (!the_index.untracked) {
                        uc = xcalloc(1, sizeof(*uc));
-- 
2.7.0.rc2.11.g68ccdd4

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