update-index: add a new --force-write-index option

diff --git a/builtin/update-index.c b/builtin/update-index.c
index d562f2ec69c28f9cecf7da07e71374ae9aecad93..e1ca0759d587b69d76d75cdda6790f8be4e13563 100644 (file)
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -915,6 +915,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
        struct refresh_params refresh_args = {0, &has_errors};
        int lock_error = 0;
        int split_index = -1;
+       int force_write = 0;
        struct lock_file *lock_file;
        struct parse_opt_ctx_t ctx;
        strbuf_getline_fn getline_fn;
@@ -1006,6 +1007,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
                            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_SET_INT(0, "force-write-index", &force_write,
+                       N_("write out the index even if is not flagged as changed"), 1),
                OPT_END()
        };
 
@@ -1147,7 +1150,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
                die("BUG: bad untracked_cache value: %d", untracked_cache);
        }
 
-       if (active_cache_changed) {
+       if (active_cache_changed || force_write) {
                if (newfd < 0) {
                        if (refresh_args.flags & REFRESH_QUIET)
                                exit(128);