chmod after truncate and setutimes on the remote side.

When the source file permission is r--r--r--, truncate and setutimes
AFTER chmod fail due to permission deined. So, do chmod after truncate
and setutimes.

src/fileops.c

@@ -323,12 +323,14 @@ int mscp_setstat(const char *path, struct stat *st, bool preserve_ts, sftp_sessi
 		ret = sftp_setstat(sftp, path, &attr);
 		sftp_err_to_errno(sftp);
 	} else {
-		if ((ret = chmod(path, st->st_mode)) < 0)
-			return ret;
 		if ((ret = truncate(path, st->st_size)) < 0)
 			return ret;
-		if (preserve_ts)
-			ret = setutimes(path, st->st_atim, st->st_mtim);
+		if (preserve_ts) {
+			if ((ret = setutimes(path, st->st_atim, st->st_mtim)) < 0)
+				return ret;
+		}
+		if ((ret = chmod(path, st->st_mode)) < 0)
+			return ret;
 	}
 
 	return ret;

test/test_e2e.py

@@ -321,6 +321,21 @@ def test_dont_truncate_dst(mscp, src_prefix, dst_prefix):
     assert md5_before == md5_after
     f.cleanup()
 
+@pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
+def test_copy_readonly_file(mscp, src_prefix, dst_prefix):
+    """When a source file permission is r--r--r--, if chmod(r--r--r--)
+    runs first on the remote side, following truncate() and setutime()
+    fail due to permission deneid. So, run chmod() after truncate()
+    and setutime()
+
+    """
+    src = File("src", size = 1024 * 1024 * 128, perm = 0o444).make()
+    dst = File("dst")
+    run2ok([mscp, "-H", "-vvv", src_prefix + src.path, dst_prefix + dst.path])
+    assert check_same_md5sum(src, dst)
+    src.cleanup()
+    dst.cleanup()
+
 @pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
 def test_dont_make_conns_more_than_chunks(mscp, src_prefix, dst_prefix):
     # copy 100 files with -n 20 -I 1 options. if mscp creates 20 SSH