fix(docker): chown hermes-owned top-level state files on boot (#35098) (#36236)

The targeted data-volume chown in stage2-hook.sh only covers hermes-owned
*subdirectories*; loose state files living directly under $HERMES_HOME
(auth.json, state.db, gateway.lock, gateway_state.json, …) are missed.
When created or rewritten by `docker exec <container> hermes …` (root
unless `-u` is passed) they land root-owned, and the unprivileged hermes
runtime then hits PermissionError on next startup, producing a gateway
restart loop.

Fix: reset ownership of an explicit allowlist of hermes-owned top-level
files on every boot. The list mirrors the top-level file entries of
hermes_cli.profile_distribution.USER_OWNED_EXCLUDE plus the runtime lock
files.

This uses a targeted allowlist rather than the originally-proposed blanket
`find $HERMES_HOME -maxdepth 1 -user root` sweep, preserving the
targeted-ownership contract from #19788 / PR #19795: a bind-mounted
$HERMES_HOME may contain host-owned files Hermes does not manage, and
those must never be chowned. Verified end-to-end: allowlisted root-owned
files are reset to hermes on restart while a non-allowlisted host file
keeps its root ownership.

Co-authored-by: x1am1 <2663402852@qq.com>

tests/tools/test_stage2_hook_toplevel_chown.py

@@ -0,0 +1,138 @@
+"""Contract test: the s6-overlay stage2 hook resets ownership of hermes-owned
+top-level state files in $HERMES_HOME — but only those, never arbitrary
+host-owned files.
+
+Regression guard for the gateway restart loop reported in #35098: files such
+as gateway.lock / state.db / auth.json live directly under $HERMES_HOME (not in
+a subdir), so the targeted subdir chown misses them. When created or rewritten
+by `docker exec <container> hermes …` (root unless `-u` is passed) they land
+root-owned and the unprivileged hermes runtime then hits PermissionError on next
+startup.
+
+The fix uses an explicit allowlist rather than a blanket `find -user root`
+sweep, preserving the targeted-ownership contract from #19788 / PR #19795: a
+bind-mounted $HERMES_HOME may contain host-owned files Hermes does not manage,
+and those must never be chowned.
+
+The s6-overlay rework moved bootstrap from docker/entrypoint.sh (now a shim) to
+docker/stage2-hook.sh, installed as /etc/cont-init.d/01-hermes-setup. This test
+targets that location.
+"""
+from __future__ import annotations
+
+import os
+import re
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+STAGE2_HOOK = REPO_ROOT / "docker" / "stage2-hook.sh"
+
+
+@pytest.fixture(scope="module")
+def stage2_text() -> str:
+    if not STAGE2_HOOK.exists():
+        pytest.skip("docker/stage2-hook.sh not present in this checkout")
+    return STAGE2_HOOK.read_text()
+
+
+def _toplevel_chown_loop(text: str) -> str:
+    """Extract the `for f in … chown hermes:hermes "$HERMES_HOME/$f" … done`
+    block that repairs top-level state-file ownership."""
+    m = re.search(
+        r"(for f in \\\n(?:.*\\\n)*?.*; do\n(?:.*\n)*?done)",
+        text,
+    )
+    assert m, "stage2-hook.sh must contain the top-level-file chown for-loop (#35098)"
+    block = m.group(1)
+    assert 'chown hermes:hermes "$HERMES_HOME/$f"' in block, (
+        "the top-level-file loop must chown each allowlisted file to hermes"
+    )
+    return block
+
+
+def test_toplevel_chown_loop_present(stage2_text: str) -> None:
+    block = _toplevel_chown_loop(stage2_text)
+    # The reported-broken files must be covered.
+    for required in ("auth.json", "state.db", "gateway.lock", "gateway_state.json"):
+        assert required in block, (
+            f"top-level chown allowlist must include {required!r} (#35098)"
+        )
+
+
+def test_no_blanket_find_user_root_sweep(stage2_text: str) -> None:
+    """The fix must NOT reintroduce a blanket `find … -user root` chown of
+    $HERMES_HOME contents — that would clobber host-owned files in a bind mount
+    (#19788 / PR #19795)."""
+    assert not re.search(r"find\s+\"?\$\{?HERMES_HOME\}?\"?[^\n]*-user\s+root", stage2_text), (
+        "stage2-hook.sh must not blanket-chown root-owned files under "
+        "$HERMES_HOME via `find -user root`; use the targeted allowlist instead "
+        "so host-owned bind-mounted files are preserved (#19788, #19795)."
+    )
+
+
+def _run_loop(text: str, present_files: list[str]) -> list[str]:
+    """Run the extracted chown loop in a sandbox $HERMES_HOME, with `chown`
+    stubbed to record which paths it was asked to touch. Returns the basenames
+    the loop attempted to chown."""
+    bash = shutil.which("bash")
+    if bash is None:
+        pytest.skip("bash not available")
+    block = _toplevel_chown_loop(text)
+
+    import tempfile
+
+    with tempfile.TemporaryDirectory() as d:
+        dpath = Path(d)
+        home = dpath / "home"
+        home.mkdir()
+        for f in present_files:
+            (home / f).touch()
+        # A non-allowlisted, "host-owned" file that must never be chowned.
+        (home / "host_secret.json").touch()
+
+        # Stub chown to record the basename of its last argument (the path),
+        # so we observe exactly which files the allowlist loop selected
+        # without needing real root privileges.
+        script = (
+            "set -e\n"
+            f'HERMES_HOME="{home}"\n'
+            f'chown() {{ for a in "$@"; do :; done; echo "${{a##*/}}" >> "{dpath}/chown.log"; }}\n'
+            + block
+        )
+        script_path = dpath / "harness.sh"
+        script_path.write_text(script)
+
+        proc = subprocess.run([bash, str(script_path)], capture_output=True, text=True)
+        assert proc.returncode == 0, proc.stderr
+
+        log = dpath / "chown.log"
+        if not log.exists():
+            return []
+        return [ln for ln in log.read_text().splitlines() if ln]
+
+
+def test_loop_chowns_present_allowlisted_files(stage2_text: str) -> None:
+    touched = _run_loop(stage2_text, ["auth.json", "state.db", "gateway.lock"])
+    assert "auth.json" in touched
+    assert "state.db" in touched
+    assert "gateway.lock" in touched
+
+
+def test_loop_skips_nonallowlisted_host_file(stage2_text: str) -> None:
+    """A file NOT on the allowlist (e.g. a host-owned file in a bind mount) must
+    never be chowned, even if present."""
+    touched = _run_loop(stage2_text, ["auth.json"])
+    assert "host_secret.json" not in touched, (
+        "the allowlist loop must not touch non-allowlisted files (#19788)"
+    )
+
+
+def test_loop_skips_absent_files(stage2_text: str) -> None:
+    """Allowlisted files that don't exist are skipped (no spurious chown)."""
+    touched = _run_loop(stage2_text, ["auth.json"])
+    # state.db wasn't created, so it must not appear.
+    assert "state.db" not in touched