DEVX-133: fix: auto-discover molecule root instead of hardcoding gitea-runner

src/devx/molecule/distribute_molecule.py

@@ -30,10 +30,24 @@ from devx.i18n import _
 from devx.molecule.platforms import PLATFORMS, load_platforms
 
 DEFAULT_MAX_RUNNERS = 3
-MOLECULE_ROOT = Path("ansible/roles/gitea-runner/molecule")
 DEFAULT_ROLES_ROOT = Path("ansible/roles")
 
 
+def _default_molecule_root() -> Path:
+    """Auto-discover the single molecule directory under ansible/roles/.
+
+    If exactly one role has a molecule/ subdirectory, return it.
+    Otherwise, fall back to the first role with a molecule/ directory.
+    """
+    roles_root = DEFAULT_ROLES_ROOT
+    if not roles_root.is_dir():
+        return roles_root / "gitea_runner" / "molecule"  # sensible default for error message
+    mol_dirs = sorted(d / "molecule" for d in roles_root.iterdir() if (d / "molecule").is_dir())
+    if mol_dirs:
+        return mol_dirs[0]
+    return roles_root / "molecule"  # will produce a clear "not found" error
+
+
 @dataclass(frozen=True)
 class TestPair:
     """A (scenario, platform) combination to test."""
@@ -83,7 +97,7 @@ class MultiRoleTestPair:
 def discover_scenarios(root: Path | None = None) -> list[str]:
     """Return sorted list of molecule scenario directory names."""
     if root is None:
-        root = MOLECULE_ROOT
+        root = _default_molecule_root()
     if not root.is_dir():
         raise click.ClickException(_("Molecule directory not found: {path}", path=str(root)))
     scenarios = [d.name for d in root.iterdir() if d.is_dir() and not d.name.startswith("_") and d.name != "common"]
@@ -318,7 +332,7 @@ def _write_github_env(key: str, value: str) -> None:
     "--molecule-root",
     type=click.Path(exists=True, file_okay=False, path_type=Path),
     default=None,
-    help="Custom molecule directory (single-role mode). Default: ansible/roles/gitea-runner/molecule.",
+    help="Custom molecule directory (single-role mode). Default: auto-discovered under ansible/roles/*/molecule.",
 )
 @click.option(
     "--roles-root",

src/devx/molecule/molecule_all.py

@@ -21,7 +21,20 @@ import click
 
 from devx.molecule.platforms import PLATFORMS
 
-ROLE_DIR = Path("ansible/roles/gitea-runner")
+DEFAULT_ROLES_ROOT = Path("ansible/roles")
+
+
+def _default_role_dir() -> Path:
+    """Auto-discover the single role directory with molecule scenarios."""
+    roles_root = DEFAULT_ROLES_ROOT
+    if not roles_root.is_dir():
+        return roles_root / "gitea_runner"  # sensible default for error message
+    role_dirs = sorted(d for d in roles_root.iterdir() if (d / "molecule").is_dir())
+    if role_dirs:
+        return role_dirs[0]
+    return roles_root / "role"  # will produce a clear error
+
+
 SCENARIOS = ["default", "multi-instance", "lifecycle", "template-content", "deregister", "update"]
 
 
@@ -72,15 +85,16 @@ def main(bin_dir: str) -> None:
     if not Path(molecule_bin).exists():
         raise click.ClickException(f"molecule not found at {molecule_bin}. Run 'make setup' first.")
 
-    if not ROLE_DIR.exists():
-        raise click.ClickException(f"Role directory not found: {ROLE_DIR}")
+    role_dir = _default_role_dir()
+    if not role_dir.exists():
+        raise click.ClickException(f"Role directory not found: {role_dir}")
 
     base_env = dict(os.environ)
     base_env["ANSIBLE_ALLOW_BROKEN_CONDITIONALS"] = "true"
     base_env["ANSIBLE_INJECT_INVOCATION"] = "1"
 
     for platform in PLATFORMS:
-        rc = _run_platform(molecule_bin, platform, ROLE_DIR, SCENARIOS, base_env)
+        rc = _run_platform(molecule_bin, platform, role_dir, SCENARIOS, base_env)
         if rc != 0:
             click.echo(f"FAILED on platform {platform['name']}", err=True)
             sys.exit(rc)

src/devx/molecule/molecule_ci_guard.py

@@ -145,13 +145,19 @@ def resolve_role_dir(role: str, roles_root: Path | None, repo_root: Path) -> Pat
     """Resolve the working directory for a molecule pair.
 
     For multi-role pairs (role non-empty), uses ``roles_root/role``.
-    For single-role pairs, uses ``repo_root/ansible/roles/gitea-runner``.
+    For single-role pairs, auto-discovers the first role with a molecule/
+    subdirectory under ``repo_root/ansible/roles/``.
     """
     if role:
         if roles_root is None:
             roles_root = repo_root / "ansible" / "roles"
         return roles_root / role
-    return repo_root / "ansible" / "roles" / "gitea-runner"
+    roles_dir = repo_root / "ansible" / "roles"
+    if roles_dir.is_dir():
+        role_dirs = sorted(d for d in roles_dir.iterdir() if (d / "molecule").is_dir())
+        if role_dirs:
+            return role_dirs[0]
+    return roles_dir / "role"  # will produce a clear "not found" error
 
 
 @click.command()