publisher, deployer: report ssh failure instead of BrokenPipeError (0.9.8)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

srcpkgs/publisher/files/tests/test_core.py

@@ -3,7 +3,7 @@ from pathlib import Path
 
 import pytest
 
-from publisher import config, detect, packages, pipeline
+from publisher import config, detect, packages, pipeline, remote
 from publisher.packages import BINARY, KINDS, Published
 
 APK, APPIMAGE, TARGZ = KINDS[0], KINDS[1], KINDS[-1]
@@ -215,3 +215,14 @@ def test_detect_go(tmp_path):
 def test_site_name_cleanup():
     assert detect._site_name("Das Pressure 2") == "DasPressure2"
     assert os.path.basename(detect._home(Path.home() / "a")) == "a"
+
+
+def test_ssh_exits_early(tmp_path, monkeypatch):
+    # ssh dies at once (e.g. unresolvable host): the broken pipe must surface as RemoteError with its message
+    fake = tmp_path / "ssh"
+    fake.write_text("#!/bin/sh\necho \"ssh: Could not resolve hostname\" >&2\nexit 255\n")
+    fake.chmod(0o755)
+    monkeypatch.setenv("PATH", f"{tmp_path}:{os.environ['PATH']}")
+    srv = config.Server(host="nohost.invalid", user="u")
+    with pytest.raises(remote.RemoteError, match="Could not resolve"):
+        remote.run(srv, "x" * 5_000_000, check=False)