If $GIT_DIR is read only, we can't write $GIT_DIR/sharedindex. This
could happen when $GIT_INDEX_FILE is set to somehwere outside
$GIT_DIR.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 read-cache.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 8ecb959..aa848e1 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2030,14 +2030,21 @@ static void remove_temporary_sharedindex_on_signal(int 
signo)
        raise(signo);
 }
 
-static int write_shared_index(struct index_state *istate)
+static int write_shared_index(struct index_state *istate,
+                             struct lock_file *lock, unsigned flags)
 {
        struct split_index *si = istate->split_index;
        static int installed_handler;
        int fd, ret;
 
        temporary_sharedindex = git_pathdup("sharedindex_XXXXXX");
-       fd = xmkstemp(temporary_sharedindex);
+       fd = mkstemp(temporary_sharedindex);
+       if (fd < 0) {
+               free(temporary_sharedindex);
+               temporary_sharedindex = NULL;
+               hashclr(si->base_sha1);
+               return do_write_locked_index(istate, lock, flags);
+       }
        if (!installed_handler) {
                atexit(remove_temporary_sharedindex);
                sigchain_push_common(remove_temporary_sharedindex_on_signal);
@@ -2070,7 +2077,7 @@ int write_locked_index(struct index_state *istate, struct 
lock_file *lock,
        }
 
        if (istate->cache_changed & SPLIT_INDEX_ORDERED) {
-               int ret = write_shared_index(istate);
+               int ret = write_shared_index(istate, lock, flags);
                if (ret)
                        return ret;
        }
-- 
1.9.1.346.ga2b5940

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