Make update-index always rewrite the index when a index-version
is given, even if the index already has the right version.
This option is used for performance testing the writer and
reader.

Signed-off-by: Thomas Gummerer <t.gumme...@gmail.com>
---
 builtin/update-index.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/builtin/update-index.c b/builtin/update-index.c
index 4ce341c..c31d176 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -6,6 +6,7 @@
 #include "cache.h"
 #include "quote.h"
 #include "cache-tree.h"
+#include "read-cache.h"
 #include "tree-walk.h"
 #include "builtin.h"
 #include "refs.h"
@@ -861,6 +862,7 @@ int cmd_update_index(int argc, const char **argv, const 
char *prefix)
                if (the_index.version != preferred_index_format)
                        active_cache_changed = 1;
                the_index.version = preferred_index_format;
+               set_istate_ops(&the_index);
        }
 
        if (read_from_stdin) {
@@ -886,7 +888,7 @@ int cmd_update_index(int argc, const char **argv, const 
char *prefix)
                strbuf_release(&buf);
        }
 
-       if (active_cache_changed) {
+       if (active_cache_changed || preferred_index_format) {
                if (newfd < 0) {
                        if (refresh_args.flags & REFRESH_QUIET)
                                exit(128);
-- 
1.7.11.2

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