Add a force-rewrite option to update-index, which allows the user
to rewrite the index, even if there are no changes. This can be used
to do performance tests of both the reader and the writer.

Signed-off-by: Thomas Gummerer <>
 builtin/update-index.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/builtin/update-index.c b/builtin/update-index.c
index e747def..063bf54 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -24,6 +24,7 @@ static int allow_remove;
 static int allow_replace;
 static int info_only;
 static int force_remove;
+static int force_rewrite;
 static int verbose;
 static int mark_valid_only;
 static int mark_skip_worktree_only;
@@ -734,6 +735,8 @@ int cmd_update_index(int argc, const char **argv, const 
char *prefix)
                OPT_BIT(0, "unmerged", &refresh_args.flags,
                        "refresh even if index contains unmerged entries",
+               OPT_SET_INT(0, "force-rewrite", &force_rewrite,
+                       "force a index rewrite even if there is no change", 1),
                {OPTION_CALLBACK, 0, "refresh", &refresh_args, NULL,
                        "refresh stat information",
                        PARSE_OPT_NOARG | PARSE_OPT_NONEG,
@@ -892,7 +895,7 @@ int cmd_update_index(int argc, const char **argv, const 
char *prefix)
-       if (active_cache_changed) {
+       if (active_cache_changed || force_rewrite) {
                if (newfd < 0) {
                        if (refresh_args.flags & REFRESH_QUIET)

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