feat(mirror): support SSH MIRRORS, multi-push origin and remote probe

- Switch MIRRORS to SSH-based URLs including custom ports/domains
  (GitHub, git.veen.world, code.cymais.cloud)
- Extend mirror IO:
  - load_config_mirrors filters empty values
  - read_mirrors_file now supports:
    * "name url" lines
    * "url" lines with auto-generated names from URL host (host[:port])
  - write_mirrors_file prints full preview content
- Enhance git_remote:
  - determine_primary_remote_url used for origin bootstrap
  - ensure_origin_remote keeps existing origin URL and
    adds all mirror URLs as additional push URLs
  - add is_remote_reachable() helper based on `git ls-remote --exit-code`
- Implement non-destructive remote mirror checks in setup_cmd:
  - `_probe_mirror()` wraps `git ls-remote` and returns (ok, message)
  - `pkgmgr mirror setup --remote` now probes each mirror URL and
    prints [OK]/[WARN] with details instead of placeholder text
- Add unit tests for mirror actions:
  - test_git_remote: default SSH URL building and primary URL selection
  - test_io: config + MIRRORS parsing including auto-named URL-only entries
  - test_setup_cmd: probe_mirror success/failure handling

https://chatgpt.com/share/693adee0-aa3c-800f-b72a-98473fdaf760

tests/unit/pkgmgr/actions/mirror/test_git_remote.py

@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+import unittest
+
+from pkgmgr.actions.mirror.git_remote import (
+    build_default_ssh_url,
+    determine_primary_remote_url,
+)
+from pkgmgr.actions.mirror.types import MirrorMap, Repository
+
+
+class TestMirrorGitRemote(unittest.TestCase):
+    """
+    Unit tests for SSH URL and primary remote selection logic.
+    """
+
+    def test_build_default_ssh_url_without_port(self) -> None:
+        repo: Repository = {
+            "provider": "github.com",
+            "account": "kevinveenbirkenbach",
+            "repository": "package-manager",
+        }
+
+        url = build_default_ssh_url(repo)
+        self.assertEqual(
+            url,
+            "git@github.com:kevinveenbirkenbach/package-manager.git",
+        )
+
+    def test_build_default_ssh_url_with_port(self) -> None:
+        repo: Repository = {
+            "provider": "code.cymais.cloud",
+            "account": "kevinveenbirkenbach",
+            "repository": "pkgmgr",
+            "port": 2201,
+        }
+
+        url = build_default_ssh_url(repo)
+        self.assertEqual(
+            url,
+            "ssh://git@code.cymais.cloud:2201/kevinveenbirkenbach/pkgmgr.git",
+        )
+
+    def test_build_default_ssh_url_missing_fields_returns_none(self) -> None:
+        repo: Repository = {
+            "provider": "github.com",
+            "account": "kevinveenbirkenbach",
+            # "repository" fehlt absichtlich
+        }
+
+        url = build_default_ssh_url(repo)
+        self.assertIsNone(url)
+
+    def test_determine_primary_remote_url_prefers_origin_in_resolved_mirrors(
+        self,
+    ) -> None:
+        repo: Repository = {
+            "provider": "github.com",
+            "account": "kevinveenbirkenbach",
+            "repository": "package-manager",
+        }
+        mirrors: MirrorMap = {
+            "origin": "git@github.com:kevinveenbirkenbach/package-manager.git",
+            "backup": "ssh://git@git.veen.world:2201/kevinveenbirkenbach/pkgmgr.git",
+        }
+
+        url = determine_primary_remote_url(repo, mirrors)
+        self.assertEqual(
+            url,
+            "git@github.com:kevinveenbirkenbach/package-manager.git",
+        )
+
+    def test_determine_primary_remote_url_uses_any_mirror_if_no_origin(self) -> None:
+        repo: Repository = {
+            "provider": "github.com",
+            "account": "kevinveenbirkenbach",
+            "repository": "package-manager",
+        }
+        mirrors: MirrorMap = {
+            "backup": "ssh://git@git.veen.world:2201/kevinveenbirkenbach/pkgmgr.git",
+            "mirror2": "ssh://git@code.cymais.cloud:2201/kevinveenbirkenbach/pkgmgr.git",
+        }
+
+        url = determine_primary_remote_url(repo, mirrors)
+        # Alphabetisch sortiert: backup, mirror2 → backup gewinnt
+        self.assertEqual(
+            url,
+            "ssh://git@git.veen.world:2201/kevinveenbirkenbach/pkgmgr.git",
+        )
+
+    def test_determine_primary_remote_url_falls_back_to_default_ssh(self) -> None:
+        repo: Repository = {
+            "provider": "github.com",
+            "account": "kevinveenbirkenbach",
+            "repository": "package-manager",
+        }
+        mirrors: MirrorMap = {}
+
+        url = determine_primary_remote_url(repo, mirrors)
+        self.assertEqual(
+            url,
+            "git@github.com:kevinveenbirkenbach/package-manager.git",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/unit/pkgmgr/actions/mirror/test_io.py

@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+import os
+import tempfile
+import unittest
+
+from pkgmgr.actions.mirror.io import (
+    load_config_mirrors,
+    read_mirrors_file,
+)
+
+
+class TestMirrorIO(unittest.TestCase):
+    """
+    Unit tests for pkgmgr.actions.mirror.io helpers.
+    """
+
+    # ------------------------------------------------------------------
+    # load_config_mirrors
+    # ------------------------------------------------------------------
+    def test_load_config_mirrors_from_dict(self) -> None:
+        repo = {
+            "mirrors": {
+                "origin": "ssh://git@example.com/account/repo.git",
+                "backup": "ssh://git@backup/account/repo.git",
+                "empty": "",
+                "none": None,
+            }
+        }
+
+        mirrors = load_config_mirrors(repo)
+
+        self.assertEqual(
+            mirrors,
+            {
+                "origin": "ssh://git@example.com/account/repo.git",
+                "backup": "ssh://git@backup/account/repo.git",
+            },
+        )
+
+    def test_load_config_mirrors_from_list(self) -> None:
+        repo = {
+            "mirrors": [
+                {"name": "origin", "url": "ssh://git@example.com/account/repo.git"},
+                {"name": "backup", "url": "ssh://git@backup/account/repo.git"},
+                {"name": "", "url": "ssh://git@invalid/ignored.git"},
+                {"name": "missing-url"},
+                "not-a-dict",
+            ]
+        }
+
+        mirrors = load_config_mirrors(repo)
+
+        self.assertEqual(
+            mirrors,
+            {
+                "origin": "ssh://git@example.com/account/repo.git",
+                "backup": "ssh://git@backup/account/repo.git",
+            },
+        )
+
+    def test_load_config_mirrors_empty_when_missing(self) -> None:
+        repo = {}
+        mirrors = load_config_mirrors(repo)
+        self.assertEqual(mirrors, {})
+
+    # ------------------------------------------------------------------
+    # read_mirrors_file
+    # ------------------------------------------------------------------
+    def test_read_mirrors_file_with_named_and_url_only_entries(self) -> None:
+        """
+        Ensure that the MIRRORS file format is parsed correctly:
+
+          - 'name url' → exact name
+          - 'url'      → auto name derived from netloc (host[:port]),
+                         with numeric suffix if duplicated.
+        """
+        with tempfile.TemporaryDirectory() as tmpdir:
+            mirrors_path = os.path.join(tmpdir, "MIRRORS")
+            content = "\n".join(
+                [
+                    "# comment",
+                    "",
+                    "origin ssh://git@example.com/account/repo.git",
+                    "https://github.com/kevinveenbirkenbach/package-manager",
+                    "https://github.com/kevinveenbirkenbach/another-repo",
+                    "ssh://git@git.veen.world:2201/kevinveenbirkenbach/pkgmgr.git",
+                ]
+            )
+
+            with open(mirrors_path, "w", encoding="utf-8") as fh:
+                fh.write(content + "\n")
+
+            mirrors = read_mirrors_file(tmpdir)
+
+        # 'origin' is preserved as given
+        self.assertIn("origin", mirrors)
+        self.assertEqual(
+            mirrors["origin"],
+            "ssh://git@example.com/account/repo.git",
+        )
+
+        # Two GitHub URLs → auto names: github.com, github.com2
+        github_urls = {
+            mirrors.get("github.com"),
+            mirrors.get("github.com2"),
+        }
+        self.assertIn(
+            "https://github.com/kevinveenbirkenbach/package-manager",
+            github_urls,
+        )
+        self.assertIn(
+            "https://github.com/kevinveenbirkenbach/another-repo",
+            github_urls,
+        )
+
+        # SSH-URL mit User-Teil → netloc ist "git@git.veen.world:2201"
+        # → host = "git@git.veen.world"
+        self.assertIn("git@git.veen.world", mirrors)
+        self.assertEqual(
+            mirrors["git@git.veen.world"],
+            "ssh://git@git.veen.world:2201/kevinveenbirkenbach/pkgmgr.git",
+        )
+
+    def test_read_mirrors_file_missing_returns_empty(self) -> None:
+        with tempfile.TemporaryDirectory() as tmpdir:
+            mirrors = read_mirrors_file(tmpdir)  # no MIRRORS file
+        self.assertEqual(mirrors, {})
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/unit/pkgmgr/actions/mirror/test_setup_cmd.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from __future__ import annotations
+
+import unittest
+from unittest.mock import patch
+
+from pkgmgr.actions.mirror.setup_cmd import _probe_mirror
+from pkgmgr.core.git import GitError
+
+
+class TestMirrorSetupCmd(unittest.TestCase):
+    """
+    Unit tests for the non-destructive remote probing logic in setup_cmd.
+    """
+
+    @patch("pkgmgr.actions.mirror.setup_cmd.run_git")
+    def test_probe_mirror_success_returns_true_and_empty_message(
+        self,
+        mock_run_git,
+    ) -> None:
+        """
+        If run_git returns successfully, _probe_mirror must report (True, "").
+        """
+        mock_run_git.return_value = "dummy-output"
+
+        ok, message = _probe_mirror(
+            "ssh://git@code.cymais.cloud:2201/kevinveenbirkenbach/pkgmgr.git",
+            "/tmp/some-repo",
+        )
+
+        self.assertTrue(ok)
+        self.assertEqual(message, "")
+        mock_run_git.assert_called_once()
+
+    @patch("pkgmgr.actions.mirror.setup_cmd.run_git")
+    def test_probe_mirror_failure_returns_false_and_error_message(
+        self,
+        mock_run_git,
+    ) -> None:
+        """
+        If run_git raises GitError, _probe_mirror must report (False, <message>),
+        and not re-raise the exception.
+        """
+        mock_run_git.side_effect = GitError("Git command failed (simulated)")
+
+        ok, message = _probe_mirror(
+            "ssh://git@code.cymais.cloud:2201/kevinveenbirkenbach/pkgmgr.git",
+            "/tmp/some-repo",
+        )
+
+        self.assertFalse(ok)
+        self.assertIn("Git command failed", message)
+        mock_run_git.assert_called_once()
+
+
+if __name__ == "__main__":
+    unittest.main()