[PATCH v5 03/11] update-index: add --test-untracked-cache

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

Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
Helped-by: David Turner <dturner@xxxxxxxxxxxxxxxx>
---
 Documentation/git-update-index.txt | 12 +++++++++++-
 builtin/update-index.c             |  5 +++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index f4e5a85..a0afe17 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 +180,16 @@ 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. If a test fails
+	the exit code is 1 and a message explains what is not
+	working as needed, otherwise the exit code is 0 and OK is
+	printed.
+
 --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));
-- 
2.7.0.36.g20612a7

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