do not set O_TRUNC when opening destination file.

It prevents `mscp localhost:hoge ~/hoge` from truncating the source
file. See https://bugzilla.mindrot.org/show_bug.cgi?id=3431.

https://github.com/upa/mscp/issues/1

1 files changed, 9 insertions, 0 deletions

diff --git a/test/test_e2e.py b/test/test_e2e.py
index 841c3be..c63a09e 100644
--- a/test/test_e2e.py
+++ b/test/test_e2e.py
@@ -227,6 +227,15 @@ def test_override_dst_having_larger_size(mscp, src_prefix, dst_prefix):
     src.cleanup()
     dst.cleanup()
 
+@pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
+def test_dont_truncate_dst(mscp, src_prefix, dst_prefix):
+    f = File("srcanddst", size = 1024 * 1024 * 128).make()
+    md5_before = f.md5sum()
+    run2ok([mscp, "-H", "-vvv", src_prefix + f.path, dst_prefix + f.path])
+    md5_after = f.md5sum()
+    assert md5_before == md5_after
+    f.cleanup()
+
 compressions = ["yes", "no", "none"]
 @pytest.mark.parametrize("src_prefix, dst_prefix", param_remote_prefix)
 @pytest.mark.parametrize("compress", compressions)