feat(local-identity): add --username and --fullname overrides to init

Resolves the system identity mismatch between the Linux username (worsch)
and the bootstrap identity (tegwick / Bernd Worsch / custom email).

Resolution order for all three fields: flag > config > system derivation.
Config is updated on every init so --force reinits are idempotent without
repeating the flags.

- cli.py: extract _resolve_init_params(); add --username / --fullname args;
  persist all three fields to config.yaml on init
- tests/test_cli.py: 13 new tests covering flag priority, config fallback,
  system derivation, config persistence, idempotent --force reinit

54 tests passing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local-identity/src/local_identity/cli.py

@@ -2,8 +2,10 @@
 local-identity CLI — entry point.
 
 Commands:
-  init [--force] [--email EMAIL]   Derive primary user from Linux identity,
-                                   generate test users, write store.
+  init [--force] [--username U] [--fullname N] [--email E]
+                                   Derive primary user, generate test users,
+                                   write store.  All three identity fields are
+                                   resolved flag > config > system derivation.
   list                             List all users in the store.
   show <username>                  Display a user's YAML record.
 
@@ -19,6 +21,20 @@ from .user import UserRecord, make_test_user
 from . import store
 
 
+def _resolve_init_params(args: argparse.Namespace, config: dict) -> tuple[str, str, str]:
+    """
+    Resolve (username, fullname, email) for init from three sources in order:
+      1. CLI flags (--username, --fullname, --email)
+      2. Persisted config (~/.local-identity/config.yaml)
+      3. System derivation ($USER / /etc/passwd GECOS) — username + fullname only
+         Email has no system default; missing email falls through to prompt in cmd_init.
+    """
+    username: str = args.username or config.get("username") or current_username()
+    fullname: str = args.fullname or config.get("fullname") or get_gecos_fullname(username)
+    email: str = args.email or config.get("email") or ""
+    return username, fullname, email
+
+
 def cmd_init(args: argparse.Namespace) -> None:
     if store.store_exists() and not args.force:
         print(
@@ -28,12 +44,9 @@ def cmd_init(args: argparse.Namespace) -> None:
         )
         sys.exit(1)
 
-    username = current_username()
-    fullname = get_gecos_fullname(username)
-
-    # Email resolution: flag > existing config > interactive prompt
     config = store.read_config() if store.store_exists() else {}
-    email: str = args.email or config.get("email", "")
+    username, fullname, email = _resolve_init_params(args, config)
+
     if not email:
         try:
             email = input(f"Email address for {username}: ").strip()
@@ -44,7 +57,7 @@ def cmd_init(args: argparse.Namespace) -> None:
             sys.exit(1)
 
     store.init_dirs()
-    config["email"] = email
+    config.update({"username": username, "fullname": fullname, "email": email})
     store.write_config(config)
 
     primary = UserRecord(username=username, fullname=fullname, email=email)
@@ -102,9 +115,17 @@ def main() -> None:
         "--force", action="store_true",
         help="Reinitialise even if the store already exists",
     )
+    p_init.add_argument(
+        "--username",
+        help="Bootstrap username (default: $USER / $LOGNAME)",
+    )
+    p_init.add_argument(
+        "--fullname",
+        help="Full display name (default: /etc/passwd GECOS field)",
+    )
     p_init.add_argument(
         "--email",
-        help="Email address (skips interactive prompt)",
+        help="Email address (default: interactive prompt)",
     )
     p_init.set_defaults(func=cmd_init)
 

local-identity/tests/test_cli.py

@@ -0,0 +1,151 @@
+"""
+Tests for CLI init parameter resolution and command behaviour.
+
+cmd_init resolution order: flag > config > system derivation.
+All three identity fields (username, fullname, email) follow this pattern.
+"""
+
+import argparse
+from unittest.mock import patch
+
+import pytest
+
+from local_identity.cli import _resolve_init_params, cmd_init
+from local_identity.store import init_dirs, list_users, read_config, read_user
+
+
+def _args(username=None, fullname=None, email=None, force=False):
+    """Build a minimal Namespace for _resolve_init_params / cmd_init."""
+    ns = argparse.Namespace()
+    ns.username = username
+    ns.fullname = fullname
+    ns.email = email
+    ns.force = force
+    ns.func = cmd_init
+    return ns
+
+
+# ------------------------------------------------------------------ #
+# _resolve_init_params                                                #
+# ------------------------------------------------------------------ #
+
+class TestResolveInitParams:
+    def test_flags_take_priority_over_config_and_system(self):
+        config = {"username": "from_config", "fullname": "Config Name", "email": "config@x.com"}
+        with (
+            patch("local_identity.cli.current_username", return_value="system_user"),
+            patch("local_identity.cli.get_gecos_fullname", return_value="System Name"),
+        ):
+            u, f, e = _resolve_init_params(
+                _args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"),
+                config,
+            )
+        assert u == "tegwick"
+        assert f == "Bernd Worsch"
+        assert e == "bernd@example.com"
+
+    def test_config_takes_priority_over_system(self):
+        config = {"username": "tegwick", "fullname": "Bernd Worsch", "email": "bernd@example.com"}
+        with (
+            patch("local_identity.cli.current_username", return_value="worsch"),
+            patch("local_identity.cli.get_gecos_fullname", return_value="worsch"),
+        ):
+            u, f, e = _resolve_init_params(_args(), config)
+        assert u == "tegwick"
+        assert f == "Bernd Worsch"
+        assert e == "bernd@example.com"
+
+    def test_system_derivation_when_no_flags_or_config(self):
+        config = {}
+        with (
+            patch("local_identity.cli.current_username", return_value="worsch"),
+            patch("local_identity.cli.get_gecos_fullname", return_value="Bernd Worsch"),
+        ):
+            u, f, e = _resolve_init_params(_args(), config)
+        assert u == "worsch"
+        assert f == "Bernd Worsch"
+        assert e == ""  # no default; caller must prompt
+
+    def test_flag_username_overrides_config_username(self):
+        config = {"username": "wrong", "fullname": "X", "email": "x@x.com"}
+        with patch("local_identity.cli.current_username", return_value="system"):
+            u, _, _ = _resolve_init_params(_args(username="tegwick"), config)
+        assert u == "tegwick"
+
+    def test_flag_fullname_overrides_config_fullname(self):
+        config = {"username": "u", "fullname": "Wrong Name", "email": "x@x.com"}
+        with patch("local_identity.cli.get_gecos_fullname", return_value="Gecos Name"):
+            _, f, _ = _resolve_init_params(_args(fullname="Bernd Worsch"), config)
+        assert f == "Bernd Worsch"
+
+    def test_gecos_used_when_no_fullname_flag_or_config(self):
+        config = {"username": "tegwick", "email": "x@x.com"}
+        with patch("local_identity.cli.get_gecos_fullname", return_value="Bernd Worsch"):
+            _, f, _ = _resolve_init_params(_args(), config)
+        assert f == "Bernd Worsch"
+
+    def test_empty_email_when_absent_everywhere(self):
+        config = {"username": "u", "fullname": "N"}
+        _, _, e = _resolve_init_params(_args(), config)
+        assert e == ""
+
+
+# ------------------------------------------------------------------ #
+# cmd_init integration (uses tmp_store fixture)                       #
+# ------------------------------------------------------------------ #
+
+class TestCmdInit:
+    def test_init_with_all_flags(self, tmp_store):
+        with (
+            patch("local_identity.cli.current_username", return_value="worsch"),
+            patch("local_identity.cli.get_gecos_fullname", return_value="worsch"),
+        ):
+            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
+
+        primary = read_user("tegwick")
+        assert primary.username == "tegwick"
+        assert primary.fullname == "Bernd Worsch"
+        assert primary.email == "bernd@example.com"
+
+    def test_test_users_derived_from_override_username(self, tmp_store):
+        with patch("local_identity.cli.current_username", return_value="worsch"):
+            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
+
+        users = {u.username for u in list_users()}
+        assert users == {"tegwick", "tegwick1", "tegwick2"}
+
+    def test_test_user_email_uses_override_email(self, tmp_store):
+        with patch("local_identity.cli.current_username", return_value="worsch"):
+            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
+
+        assert read_user("tegwick1").email == "bernd+test1@example.com"
+        assert read_user("tegwick2").email == "bernd+test2@example.com"
+
+    def test_overrides_persisted_to_config(self, tmp_store):
+        with patch("local_identity.cli.current_username", return_value="worsch"):
+            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
+
+        cfg = read_config()
+        assert cfg["username"] == "tegwick"
+        assert cfg["fullname"] == "Bernd Worsch"
+        assert cfg["email"] == "bernd@example.com"
+
+    def test_force_reinit_reads_config_without_flags(self, tmp_store):
+        with patch("local_identity.cli.current_username", return_value="worsch"):
+            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
+            # Second init with --force and no flags — should reuse config
+            cmd_init(_args(force=True))
+
+        primary = read_user("tegwick")
+        assert primary.username == "tegwick"
+        assert primary.fullname == "Bernd Worsch"
+
+    def test_fails_if_store_exists_without_force(self, tmp_store):
+        with (
+            patch("local_identity.cli.current_username", return_value="worsch"),
+            pytest.raises(SystemExit) as exc_info,
+        ):
+            cmd_init(_args(email="a@b.com"))
+            cmd_init(_args(email="a@b.com"))  # second call should fail
+
+        assert exc_info.value.code == 1