update-ref: fail create operation over stdin if ref already exists

diff --git a/diffcore-order.c b/diffcore-order.c
index 50c089bb2b3343458fb3929d4c9eac37966063cf..fe7f1f4647a16a5882cc4c1e63738c7faa4bc677 100644 (file)
--- a/diffcore-order.c
+++ b/diffcore-order.c
@@ -10,28 +10,21 @@ static int order_cnt;
 
 static void prepare_order(const char *orderfile)
 {
-       int fd, cnt, pass;
+       int cnt, pass;
+       struct strbuf sb = STRBUF_INIT;
        void *map;
        char *cp, *endp;
-       struct stat st;
-       size_t sz;
+       ssize_t sz;
 
        if (order)
                return;
 
-       fd = open(orderfile, O_RDONLY);
-       if (fd < 0)
-               return;
-       if (fstat(fd, &st)) {
-               close(fd);
-               return;
-       }
-       sz = xsize_t(st.st_size);
-       map = mmap(NULL, sz, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
-       close(fd);
-       if (map == MAP_FAILED)
-               return;
+       sz = strbuf_read_file(&sb, orderfile, 0);
+       if (sz < 0)
+               die_errno(_("failed to read orderfile '%s'"), orderfile);
+       map = strbuf_detach(&sb, NULL);
        endp = (char *) map + sz;
+
        for (pass = 0; pass < 2; pass++) {
                cnt = 0;
                cp = map;