afh: Implement --preserve.
[paraslash.git] / afh.c
diff --git a/afh.c b/afh.c
index aa6570e..ffb4315 100644 (file)
--- a/afh.c
+++ b/afh.c
@@ -113,6 +113,24 @@ static int rewrite_tags(const char *name, int input_fd, void *map,
                        goto out;
        }
        ret = xrename(tmp_name, name);
+       if (ret < 0)
+               goto out;
+       if (OPT_GIVEN(PRESERVE)) {
+               struct timespec times[2]; /* [0]: atime, [1]: mtime */
+               times[0].tv_nsec = UTIME_OMIT;
+               times[1] = sb.st_mtim;
+               /*
+                * We might well have written a file of identical size. If we
+                * keep the mtime as well, we might fool backup applications
+                * like rsync which skip files whose size and mtime haven't
+                * changed. So we change the mtime slightly.
+                */
+               times[1].tv_sec++;
+               if (futimens(output_fd, times) < 0) {
+                       ret = -ERRNO_TO_PARA_ERROR(errno);
+                       goto out;
+               }
+       }
 out:
        if (ret < 0 && output_fd >= 0)
                unlink(tmp_name); /* ignore errors */