- for (i = 0; i < entries; i++) {
- struct cache_entry *ce = cache[i];
- int size = ce_size(ce);
- if (write(newfd, ce, size) != size)
- return -1;
+/*
+ * "refresh" does not calculate a new sha1 file or bring the
+ * cache up-to-date for mode/content changes. But what it
+ * _does_ do is to "re-match" the stat information of a file
+ * with the cache, so that you can refresh the cache for a
+ * file that hasn't been changed but where the stat entry is
+ * out of date.
+ *
+ * For example, you'd want to do this after doing a "read-tree",
+ * to link up the stat cache details with the proper files.
+ */
+static struct cache_entry *refresh_entry(struct cache_entry *ce)
+{
+ struct stat st;
+ struct cache_entry *updated;
+ int changed, size;
+
+ if (lstat(ce->name, &st) < 0)
+ return ERR_PTR(-errno);
+
+ changed = cache_match_stat(ce, &st);
+ if (!changed)
+ return ce;
+
+ /*
+ * If the mode or type has changed, there's no point in trying
+ * to refresh the entry - it's not going to match
+ */
+ if (changed & (MODE_CHANGED | TYPE_CHANGED))
+ return ERR_PTR(-EINVAL);
+
+ switch (st.st_mode & S_IFMT) {
+ case S_IFREG:
+ if (compare_data(ce, st.st_size))
+ return ERR_PTR(-EINVAL);
+ break;
+ case S_IFLNK:
+ if (compare_link(ce, st.st_size))
+ return ERR_PTR(-EINVAL);
+ break;
+ default:
+ return ERR_PTR(-EINVAL);