#!/bin/bash
# posix.sh -- repo-owned macOS/Linux Desktop update hand-off.
#
# The whole job: wait for the Desktop to exit, run `hermes update`, tell the
# shim how it went, reopen the app. The Desktop spawns this detached and
# quits; because it lives in the checkout, every update refreshes the code
# that drives the next one. Replaces the in-app updater
# (applyUpdatesPosixInApp) -- with the app gone before the update starts,
# the HERMES_DESKTOP_CHILD_PID reaper-exclusion dance dies with it.
#
# CONTRACT (keep in sync with apps/desktop/electron/main.ts):
#   bash scripts/desktop-update/posix.sh
#     --install-root <path>    repo checkout (HERMES_HOME/hermes-agent)
#     --branch <ref>           branch to update against
#     --desktop-pid <pid>      the Electron main process to wait out
#     [--relaunch-target <p>]  mac: running .app to swap+reopen;
#                              linux: running binary (omit = no relaunch)
#     [--relaunch-cwd <p>]     linux: working directory to restore on relaunch
#     [--sandbox-fallback]     linux: the caller vouches for a sandbox opt-out
#                              (ELECTRON_DISABLE_SANDBOX / --no-sandbox launch)
#     [--no-ui] [--no-marker-cleanup] [--self-test-ui] [--self-test-gate]
#     [--self-test-marker]
#     [-- <args...>]           linux: filtered launch args to replay
#
# The shim (ui.html in a chromeless browser app window) is decoration: it
# polls /progress for the current stage or a terminal event and reacts. The
# stages come from the gates below, never from child output. It owns nothing --
# relaunch, result file, marker hygiene all happen here, identically, when
# no renderer exists. No chromium-family browser found = no UI, fine.
#
# ORDERING (the durable-truth rule): swap and relaunch are DECIDED AND
# EXECUTED before the result file is written, the marker is removed, or a
# terminal event reaches the shim. Nothing user-visible may claim an outcome
# the filesystem hasn't already delivered.

set -u

ORIGINAL_ARGS=("$@")
INSTALL_ROOT="" BRANCH="main" DESKTOP_PID=0 RELAUNCH_TARGET=""
RELAUNCH_CWD="" SANDBOX_FALLBACK=0 RELAUNCH_ARGS=()
NO_UI=0 NO_MARKER_CLEANUP=0 SELF_TEST_UI=0 SELF_TEST_GATE=0 SELF_TEST_MARKER=0
SELF_TEST_TCC_HEAL=0
HANDOFF_DAEMONIZED=0
while [ $# -gt 0 ]; do
  case "$1" in
    --install-root) INSTALL_ROOT="$2"; shift 2 ;;
    --branch) BRANCH="$2"; shift 2 ;;
    --desktop-pid) DESKTOP_PID="$2"; shift 2 ;;
    --relaunch-target) RELAUNCH_TARGET="$2"; shift 2 ;;
    --relaunch-cwd) RELAUNCH_CWD="$2"; shift 2 ;;
    --sandbox-fallback) SANDBOX_FALLBACK=1; shift ;;
    --no-ui) NO_UI=1; shift ;;
    --no-marker-cleanup) NO_MARKER_CLEANUP=1; shift ;;
    --self-test-ui) SELF_TEST_UI=1; shift ;;
    --self-test-gate) SELF_TEST_GATE=1; shift ;;
    --self-test-tcc-heal) SELF_TEST_TCC_HEAL=1; shift ;;
    --daemonized) HANDOFF_DAEMONIZED=1; shift ;;
    --self-test-marker) SELF_TEST_MARKER=1; NO_UI=1; NO_MARKER_CLEANUP=1; shift ;;
    --) shift; RELAUNCH_ARGS=("$@"); shift $# ;;
    *) echo "unknown arg: $1" >&2; exit 64 ;;
  esac
done
[ "$SELF_TEST_UI" -eq 1 ] || [ -n "$INSTALL_ROOT" ] || { echo "--install-root is required" >&2; exit 64; }

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
HERMES_HOME="${INSTALL_ROOT:+$(dirname "$INSTALL_ROOT")}"
HERMES_HOME="${HERMES_HOME:-${TMPDIR:-/tmp}}"
MARKER="$HERMES_HOME/.hermes-update-in-progress"
LOG_DIR="$HERMES_HOME/logs"; mkdir -p "$LOG_DIR" 2>/dev/null || true
LOG="$LOG_DIR/desktop-update-handoff.log"
RESULT="$HERMES_HOME/.hermes-update-result.json"
STATUS="${TMPDIR:-/tmp}/hermes-update-status.$$"
STARTED_AT="$(date +%s)"  # the shim's elapsed clock; see serve-ui.py

UI_SERVER_PID="" UI_BROWSER_PID="" FINAL_CODE=1
FINAL_MSG="update did not complete"
DONE_NOTE=""  # set when the update succeeded but the app will NOT reopen itself

log() { echo "$(date +%Y-%m-%dT%H:%M:%S%z) $1" | tee -a "$LOG" 2>/dev/null; }

# Keep a durable signal breadcrumb.  A detached hand-off used to leave only the
# generic FINAL_MSG when it was terminated while the updater child was running,
# which erased the one fact needed to diagnose the failure.
TERM_TEARDOWN_IGNORED=0
on_signal() {
  local sig="$1" pgid="unknown"
  pgid="$(ps -o pgid= -p $$ 2>/dev/null | tr -d '[:space:]')"
  # Electron sends one final TERM to the detached hand-off process group while
  # quitting, even after the orchestrator has been re-parented to PID 1.  That
  # TERM is teardown noise, not a user cancellation.  Ignore it once only when
  # the originating desktop PID is already gone; a later TERM still stops us.
  if [ "$sig" = "TERM" ] && [ "$HANDOFF_DAEMONIZED" -eq 1 ] \
      && [ "$TERM_TEARDOWN_IGNORED" -eq 0 ] && ! kill -0 "$DESKTOP_PID" 2>/dev/null; then
    TERM_TEARDOWN_IGNORED=1
    log "SIGNAL: TERM ignored after desktop teardown pid=$$ ppid=$PPID pgid=${pgid:-unknown} desktopPid=$DESKTOP_PID"
    return 0
  fi
  log "SIGNAL: $sig pid=$$ ppid=$PPID pgid=${pgid:-unknown}"
  FINAL_MSG="Update hand-off was interrupted by $sig (pid $$)."
  case "$sig" in
    HUP) FINAL_CODE=129 ;;
    INT) FINAL_CODE=130 ;;
    QUIT) FINAL_CODE=131 ;;
    TERM) FINAL_CODE=143 ;;
  esac
  exit "$FINAL_CODE"
}
trap 'on_signal HUP' HUP
trap 'on_signal INT' INT
trap 'on_signal QUIT' QUIT
trap 'on_signal TERM' TERM

# ── shim ────────────────────────────────────────────────────────────────────
json_escape() { # minimal JSON string escape: \ " and control whitespace
  local s=${1//\\/\\\\}
  s=${s//\"/\\\"}
  s=${s//$'\n'/\\n}
  s=${s//$'\r'/\\r}
  s=${s//$'\t'/\\t}
  printf '%s' "$s"
}

notify_fallback() { # status message — renderer-free recovery surface.
  # Fires only when there is no shim window. BEST-EFFORT immediate channel:
  # each rung requires EXECUTION acceptance, not existence — notify-send's
  # exit code is its acceptance (fire-and-forget), zenity/kdialog must
  # survive their first second (a dialog that dies instantly had no display
  # and must not eat the message). The GUARANTEED channel is the result
  # file: a manual/error outcome is durably marked and the next Desktop
  # boot surfaces it in a dialog (handoff-result.ts + main.ts).
  case "$1" in manual|error) ;; *) return 0 ;; esac
  if [ "$(uname)" = "Darwin" ]; then
    /usr/bin/osascript -e "display notification \"$(printf '%s' "$2" | sed 's/"/\\"/g')\" with title \"Hermes update\"" 2>/dev/null && return 0
  else
    if command -v notify-send >/dev/null 2>&1; then
      notify-send -u critical "Hermes update" "$2" 2>/dev/null && return 0
    fi
    local p
    if command -v zenity >/dev/null 2>&1; then
      zenity --warning --title="Hermes update" --text="$2" 2>/dev/null &
      p=$!; sleep 1
      kill -0 "$p" 2>/dev/null && return 0
      wait "$p" 2>/dev/null
    fi
    if command -v kdialog >/dev/null 2>&1; then
      kdialog --title "Hermes update" --sorry "$2" 2>/dev/null &
      p=$!; sleep 1
      kill -0 "$p" 2>/dev/null && return 0
      wait "$p" 2>/dev/null
    fi
  fi
  # No immediate surface landed. The durable channel takes over: the result
  # is marked manual/failed and the next boot shows it in a real dialog.
  log "NOTICE: no notification surface accepted; outcome reaches the user via the result dialog on next launch: $2"
}

write_status() { # status message -- atomic replace; the server reads per poll
  printf '{"status":"%s","message":"%s"}' "$(json_escape "$1")" "$(json_escape "$2")" > "$STATUS.tmp" \
    && mv -f "$STATUS.tmp" "$STATUS" 2>/dev/null || true
}

publish_stage() { # a long wait the orchestrator is already gating on. No poll
  # beat (that would add a second per stage to every update) and no
  # notification fallback (there is nothing here for the user to act on).
  write_status "running" "$1"
}

publish() { # terminal event -- the page must render it before teardown
  write_status "$1" "$2"
  [ -n "$UI_SERVER_PID" ] && sleep 1  # one poll beat to render the state
  [ -z "$UI_SERVER_PID" ] && notify_fallback "$1" "$2"
}

find_browser() {
  local c
  # No Microsoft Edge and no Brave, on purpose. Edge's OS-level
  # Microsoft-account integration signs a fresh throwaway profile into the
  # user's MSA and renders its own "syncing your data" notification — MSA
  # email included — inside this window that is titled "Hermes" (#88410).
  # Brave paints its own P3A privacy-notice bar over the progress page in
  # the same window — cramped to unreadability at the shim's small size
  # (#88682). The throwaway --user-data-dir below cannot block either; the
  # remaining Chromium-family browsers carry no first-run chrome of their
  # own into a fresh profile.
  if [ "$(uname)" = "Darwin" ]; then
    for c in "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" \
             "/Applications/Chromium.app/Contents/MacOS/Chromium"; do
      [ -x "$c" ] && { echo "$c"; return; }
    done
  else
    for c in google-chrome google-chrome-stable chromium chromium-browser; do
      command -v "$c" 2>/dev/null && return
    done
  fi
}

# The shim is decoration; launching a browser the user does NOT use is not.
# A Safari/Firefox/Helium user who merely has Chrome installed watched Chrome
# open on every update — a "why is Chrome opening?" surprise (community
# report, Aug 2026). Only render the shim when the system DEFAULT browser is
# itself Chromium-family; otherwise skip the window and let notify_fallback +
# the durable result file carry the outcome. Best-effort on purpose: any
# detection failure keeps today's behavior (0 = allowed).
default_browser_is_chromium() {
  local py="$1" handler=""
  if [ "$(uname)" = "Darwin" ]; then
    local plist="$HOME/Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist"
    # No explicit https handler registered = the OS default (Safari).
    [ -f "$plist" ] || return 1
    handler="$("$py" -c '
import plistlib, sys
with open(sys.argv[1], "rb") as f:
    data = plistlib.load(f)
for entry in data.get("LSHandlers", []):
    if entry.get("LSHandlerURLScheme") == "https":
        print(entry.get("LSHandlerRoleAll", ""))
        break
' "$plist" 2>/dev/null)" || return 0
    # Parsed but empty = no https override = Safari default.
    [ -n "$handler" ] || return 1
    case "$handler" in
      com.google.[Cc]hrome*|org.chromium.[Cc]hromium*) return 0 ;;
      *) return 1 ;;
    esac
  fi
  # Linux: xdg-settings is the authority; missing tool = permissive.
  command -v xdg-settings >/dev/null 2>&1 || return 0
  handler="$(xdg-settings get default-web-browser 2>/dev/null)" || return 0
  [ -n "$handler" ] || return 0
  case "$handler" in
    *chrome*|*chromium*|*Chrome*|*Chromium*) return 0 ;;
    *) return 1 ;;
  esac
}

start_ui() {
  [ "$NO_UI" -eq 1 ] && return
  local html="$SCRIPT_DIR/ui.html" py browser port="" i
  py="${INSTALL_ROOT:+$INSTALL_ROOT/venv/bin/python3}"
  [ -x "${py:-/nonexistent}" ] || py="$(command -v python3 2>/dev/null)"
  browser="$(find_browser)"
  if [ -n "$browser" ] && [ -n "$py" ] && ! default_browser_is_chromium "$py"; then
    log "shim: default browser is not Chromium-family; skipping UI window"
    browser=""
  fi
  { [ -f "$html" ] && [ -n "$py" ] && [ -n "$browser" ]; } || { log "shim: no renderer; skipping UI"; return; }

  publish_stage ""
  # The Desktop's final teardown targets the updater process group.  Put both
  # UI processes in their own sessions so neither the HTTP server nor a Chrome
  # renderer becomes collateral damage (Chrome surfaces that renderer death as
  # an "Aw, Snap!" page with error code 15 even while /progress still returns
  # HTTP 200).  The Python wrapper immediately execs the real process, so $!
  # remains the PID that stop_ui can terminate.
  # TERM/HUP stay IGNORED in the server (SIG_IGN survives execv): a stray
  # teardown TERM killed the shim ~1s into `hermes update` (2026-08-14 16:44,
  # window showed ERR_CONNECTION_REFUSED for the whole run; upstream #66753).
  # stop_ui ends the server with SIGKILL instead — it is stateless HTTP.
  "$py" -c 'import os, signal, sys; os.setsid(); signal.signal(signal.SIGTERM, signal.SIG_IGN); signal.signal(signal.SIGHUP, signal.SIG_IGN); os.execv(sys.argv[1], sys.argv[1:])' \
    "$py" "$SCRIPT_DIR/serve-ui.py" "$html" "$STATUS" "$STARTED_AT" > "$LOG_DIR/desktop-update-ui-port" 2>>"$LOG" &
  UI_SERVER_PID=$!
  for i in $(seq 1 10); do
    port="$(tr -cd '0-9' < "$LOG_DIR/desktop-update-ui-port" 2>/dev/null)"
    [ -n "$port" ] && break
    sleep 0.2
  done
  [ -n "$port" ] || { kill -9 "$UI_SERVER_PID" 2>/dev/null; UI_SERVER_PID=""; return; }

  # Throwaway profile: new window/process we own; user's browser untouched.
  "$py" -c 'import os, signal, sys; os.setsid(); signal.signal(signal.SIGTERM, signal.SIG_DFL); os.execv(sys.argv[1], sys.argv[1:])' \
    "$browser" --app="http://127.0.0.1:$port/" --user-data-dir="${TMPDIR:-/tmp}/hermes-update-ui-$$" \
    --no-first-run --no-default-browser-check --window-size=280,320 >/dev/null 2>&1 &
  UI_BROWSER_PID=$!
  log "shim: app window on 127.0.0.1:$port"
}

stop_ui() { # error/manual outcomes keep the window up briefly so a watching
  # user can read the message, then close it. The outcome is also durably
  # written to the result file and surfaced in a dialog on the next Desktop
  # boot (handoff-result.ts), so the shim window never lingers indefinitely —
  # before this, each aborted update left another orphan browser window on
  # screen until the user closed it by hand.
  if [ "${1:-}" = "leave-window" ]; then
    sleep "${HERMES_UPDATE_SHIM_GRACE_SECONDS:-15}"
  fi
  if [ -n "$UI_SERVER_PID" ]; then
    # The server ignores TERM/HUP (see start_ui) — KILL is its off switch.
    { kill -9 "$UI_SERVER_PID" && wait "$UI_SERVER_PID"; } 2>/dev/null
  fi
  if [ -n "$UI_BROWSER_PID" ]; then
    { kill "$UI_BROWSER_PID" && wait "$UI_BROWSER_PID"; } 2>/dev/null
  fi
  UI_SERVER_PID="" UI_BROWSER_PID=""
}

# ── relaunch ────────────────────────────────────────────────────────────────
# Linux relaunch gate -- an exact port of the deleted update-relaunch.ts
# decision (#45205/#37541), not a loosened rewrite:
#   * the running binary must live under THIS checkout's rebuilt
#     apps/desktop/release/linux-unpacked (anchored, path-segment-aware --
#     proof the update we just ran replaced the selected executable);
#   * chrome-sandbox ABSENT is fine (namespace-sandbox build; nothing to
#     block on), PRESENT means root-owned AND setuid or Electron refuses to
#     boot ("quit and never came back");
#   * a user sandbox opt-out (ELECTRON_DISABLE_SANDBOX=1/true in our
#     inherited env, --no-sandbox among the replayed launch args, or the
#     Desktop vouching via --sandbox-fallback) makes the relaunch safe
#     despite a failed preflight.
# Outcomes mirror decideRelaunchOutcome: relaunch | skew | manual.
GATE="" GATE_MSG=""
linux_gate() {
  local unpacked="$INSTALL_ROOT/apps/desktop/release/linux-unpacked" sb arg
  case "$RELAUNCH_TARGET" in
    "$unpacked"/*) ;;
    *) GATE=skew GATE_MSG="Backend updated, but the desktop app package (AppImage/deb/rpm) was not changed. Update or reinstall it to match."; return ;;
  esac

  sb="$unpacked/chrome-sandbox"
  if [ ! -e "$sb" ]; then GATE=relaunch; return; fi
  if [ -u "$sb" ] && [ "$(stat -c %u "$sb" 2>/dev/null)" = "0" ]; then GATE=relaunch; return; fi
  # Namespace sandbox usable => Electron never consults the setuid helper,
  # so a non-root chrome-sandbox does not block relaunch (mirrors the
  # _desktop_linux_userns_sandbox_available() probe in hermes_cli/main.py).
  if unshare --user --map-root-user true 2>/dev/null; then GATE=relaunch; return; fi

  case "${ELECTRON_DISABLE_SANDBOX:-}" in 1|true|TRUE|True) GATE=relaunch; return ;; esac
  [ "$SANDBOX_FALLBACK" -eq 1 ] && { GATE=relaunch; return; }
  for arg in ${RELAUNCH_ARGS[@]+"${RELAUNCH_ARGS[@]}"}; do
    [ "$arg" = "--no-sandbox" ] && { GATE=relaunch; return; }
  done

  GATE=manual GATE_MSG="Update complete, but the rebuilt app can't relaunch itself (its sandbox helper needs root ownership). Reopen Hermes to finish."
}

mac_swap() {
  local rebuilt="" c
  for c in "$INSTALL_ROOT/apps/desktop/release/mac-arm64/Hermes.app" \
           "$INSTALL_ROOT/apps/desktop/release/mac/Hermes.app"; do
    [ -d "$c" ] && { rebuilt="$c"; break; }
  done

  # Transactional swap: stage a full copy, move the old bundle aside, move
  # the copy in. Every step checked; a failed final move ROLLS BACK so the
  # user always has a launchable app, and the result file tells the truth.
  if [ "$FINAL_CODE" -eq 0 ] && [ -n "$rebuilt" ] && [ -d "$RELAUNCH_TARGET" ] && [ "$rebuilt" != "$RELAUNCH_TARGET" ]; then
    publish_stage "Installing the new app"
    rm -rf "$RELAUNCH_TARGET.new" "$RELAUNCH_TARGET.old" 2>/dev/null || true
    if ! /usr/bin/ditto "$rebuilt" "$RELAUNCH_TARGET.new"; then
      rm -rf "$RELAUNCH_TARGET.new" 2>/dev/null || true
      DONE_NOTE="Update complete, but the new app could not be staged; the previous version was kept. Run the update again."
      log "WARNING: bundle copy failed; keeping existing app"
    elif ! mv "$RELAUNCH_TARGET" "$RELAUNCH_TARGET.old"; then
      rm -rf "$RELAUNCH_TARGET.new" 2>/dev/null || true
      DONE_NOTE="Update complete, but the new app could not replace the old one; the previous version was kept. Run the update again."
      log "WARNING: could not move old bundle aside; keeping existing app"
    elif ! mv "$RELAUNCH_TARGET.new" "$RELAUNCH_TARGET"; then
      if mv "$RELAUNCH_TARGET.old" "$RELAUNCH_TARGET"; then
        rm -rf "$RELAUNCH_TARGET.new" 2>/dev/null || true
        DONE_NOTE="Update complete, but the new app could not be installed; the previous version was restored. Run the update again."
        log "WARNING: bundle install failed; rolled back to the previous app"
      else
        FINAL_CODE=7 FINAL_MSG="The update finished but installing the new app failed and the previous app could not be restored. Reinstall Hermes (the rebuilt app is at $rebuilt)."
        log "ERROR: bundle install failed AND rollback failed"
      fi
    else
      rm -rf "$RELAUNCH_TARGET.old" 2>/dev/null || true
      log "swapped app bundle"
    fi
  fi
}

deliver_outcome() { # the truth-determining half: swap bundles / gate the relaunch
  [ -n "$RELAUNCH_TARGET" ] || return 0
  if [ "$(uname)" = "Darwin" ]; then
    mac_swap
  else
    linux_gate
    if [ "$GATE" != "relaunch" ] && [ "$FINAL_CODE" -eq 0 ]; then
      DONE_NOTE="$GATE_MSG"
      log "no relaunch ($GATE): $GATE_MSG"
    fi
  fi
}

launch_app() { # attempted BEFORE the terminal event (launch acceptance is
  # part of the outcome — gille's review). Returns nonzero when a launch
  # was due but did not verifiably happen; caller downgrades to manual.
  [ -n "$RELAUNCH_TARGET" ] || return 0
  if [ "$(uname)" = "Darwin" ]; then
    # A supplied target that no longer exists is a REJECTED launch (the
    # swap failed badly or the bundle vanished) — not "no launch due".
    [ -d "$RELAUNCH_TARGET" ] || { log "WARNING: relaunch target missing: $RELAUNCH_TARGET"; return 1; }
    /usr/bin/xattr -dr com.apple.quarantine "$RELAUNCH_TARGET" 2>/dev/null || true
    # `open` talks to launchd and FAILS LOUDLY on a broken/unlaunchable
    # bundle — its exit code IS launch acceptance here.
    /usr/bin/open "$RELAUNCH_TARGET" || { log "WARNING: open rejected the app"; return 1; }
  elif [ "$GATE" = "relaunch" ]; then
    # setsid only proves the wrapper shell started, so verify acceptance:
    # spawn, then confirm the child is still alive shortly after — an
    # immediate exec failure (ENOENT, ELF mismatch, dead sandbox) dies
    # within the window and downgrades to manual instead of lying.
    (cd "${RELAUNCH_CWD:-/}" 2>/dev/null || cd /
     setsid "$RELAUNCH_TARGET" ${RELAUNCH_ARGS[@]+"${RELAUNCH_ARGS[@]}"} >/dev/null 2>&1 &
     echo $! > "$STATUS.launchpid") || { log "WARNING: relaunch spawn failed"; return 1; }
    local lp
    lp="$(cat "$STATUS.launchpid" 2>/dev/null)"; rm -f "$STATUS.launchpid" 2>/dev/null
    [ -n "$lp" ] || { log "WARNING: relaunch pid unknown"; return 1; }
    sleep 1.5
    kill -0 "$lp" 2>/dev/null || { log "WARNING: relaunched app exited immediately"; return 1; }
  fi
}

MANUAL=0  # 1 = update landed but the user must act (result protocol field)

write_result() {
  printf '{"ok":%s,"exit_code":%s,"manual":%s,"message":"%s","branch":"%s","finished_at":%s}' \
    "$([ "$FINAL_CODE" -eq 0 ] && echo true || echo false)" "$FINAL_CODE" \
    "$([ "$MANUAL" -eq 1 ] && echo true || echo false)" \
    "$(json_escape "$FINAL_MSG")" "$(json_escape "$BRANCH")" "$(date +%s)" \
    > "$RESULT.tmp" 2>/dev/null && mv -f "$RESULT.tmp" "$RESULT" 2>/dev/null || true
}

finish() {
  # Ordering (gille's reviews, both rounds):
  #   1. deliver the outcome (swap/gate) so the truth exists;
  #   2. durable result + marker removal (the relaunched app consumes the
  #      result on boot and must not park on our marker — this must be on
  #      disk BEFORE any launch attempt);
  #   3. attempt the launch and require ACCEPTANCE;
  #   4. only then the terminal shim event — done means "the app is coming
  #      back", manual means "it is not, here's what to do", error is error.
  # A rejected launch rewrites the result (nothing consumed it — the app
  # never started) so the next boot tells the truth too.
  deliver_outcome
  [ "$FINAL_CODE" -eq 0 ] && [ -n "$DONE_NOTE" ] && { FINAL_MSG="$DONE_NOTE"; MANUAL=1; }
  write_result

  if [ "$NO_MARKER_CLEANUP" -eq 0 ] && [ "$(head -1 "$MARKER" 2>/dev/null | tr -d '[:space:]')" = "$$" ]; then
    rm -f "$MARKER" 2>/dev/null || true
  fi

  if [ "$FINAL_CODE" -ne 0 ]; then
    publish "error" "$FINAL_MSG"; stop_ui leave-window
    launch_app || true   # error path still tries to bring the app back
    rm -f "$STATUS" "$STATUS.tmp" "$LOG_DIR/desktop-update-ui-port" 2>/dev/null || true
    return
  fi

  if [ -n "$DONE_NOTE" ]; then
    if [ "$(uname)" = "Darwin" ]; then
      # mac DONE_NOTE = swap failed but the PREVIOUS bundle was kept/rolled
      # back — bring it back up; the note still tells the user to re-run.
      # A gated linux outcome (skew/manual) skips the launch BY DESIGN.
      if ! launch_app; then
        # Even the kept bundle didn't come back: the durable message must
        # carry BOTH facts (update ok, previous app not reopened).
        FINAL_MSG="$DONE_NOTE Hermes also could not reopen itself - open it manually."
        write_result
      fi
    fi
    publish "manual" "$FINAL_MSG"; stop_ui leave-window
  elif launch_app; then
    publish "done" ""; stop_ui
  else
    # Launch was due and did not land. Downgrade: truthful result for the
    # next boot, manual state held on screen now.
    FINAL_MSG="Update complete. Reopen Hermes to finish (it could not restart itself)."
    MANUAL=1
    write_result
    publish "manual" "$FINAL_MSG"; stop_ui leave-window
  fi
  rm -f "$STATUS" "$STATUS.tmp" "$LOG_DIR/desktop-update-ui-port" 2>/dev/null || true
}
trap finish EXIT

# ── legacy macOS TCC anchor self-heal (#95759) ──────────────────────────────
# The reverted TCC interpreter anchor (#95425/#95541) left some installs with
# a real-file `venv/bin/python` copy plus a `.tcc-anchor-source` marker, and
# `python3`/`python3.N` aliases that die at interpreter init ("No module
# named 'encodings'"). On those installs EVERY normal CLI entrypoint is dead
# (`venv/bin/hermes` has a `python3` shebang), so no Python-side heal —
# doctor OR in-update — can ever run. This shell is the last surface that
# still executes, so the heal lives here (recovery design after @aeonsong's
# #96231; heal-point observation by @ahrazzle / @tokenfires on #95759).
#
# Ping-pong coherence with the re-landed forward anchor
# (hermes_cli/macos_tcc_anchor.ensure_tcc_anchor, which re-anchors whenever
# `venv/bin/python` is a uv-managed symlink): this heal is gated on the
# interpreter FAILING its boot probe, so a healthy anchored install is never
# touched; and when it does restore symlinks, the very `hermes update` run it
# unblocks re-installs a boot-gated healthy anchor — a one-shot convergence,
# not a loop.

tcc_probe_python() { # interpreter path → 0 iff it boots a real stdlib.
  # PYTHONHOME/PYTHONPATH are scrubbed: an inherited PYTHONHOME papers over
  # exactly the prefix-resolution failure this probe exists to detect.
  [ -x "$1" ] || return 1
  env -u PYTHONHOME -u PYTHONPATH -u PYTHONSTARTUP -u __PYVENV_LAUNCHER__ \
    "$1" -c 'import encodings' >/dev/null 2>&1
}

TCC_HEAL_STATE="not-run"

tcc_heal_rollback() { # restore every .tcc-heal-old.$$ backup in a bin dir
  local b
  for b in "$1"/*.tcc-heal-old.$$; do
    [ -e "$b" ] || [ -L "$b" ] || continue
    mv -f "$b" "${b%.tcc-heal-old.$$}" 2>/dev/null || true
  done
}

tcc_heal_cleanup() { # heal landed: drop the backups
  local b
  for b in "$1"/*.tcc-heal-old.$$; do
    [ -e "$b" ] || [ -L "$b" ] || continue
    rm -f "$b" 2>/dev/null || true
  done
}

tcc_alias_names() { # existing python3 / python3.N entries in a bin dir
  local a
  for a in "$1"/python3 "$1"/python3.*; do
    [ -e "$a" ] || [ -L "$a" ] || continue
    case "${a##*/}" in
      python3|python3.[0-9]|python3.[0-9][0-9]) printf '%s\n' "$a" ;;
    esac
  done
}

tcc_anchor_heal() { # $1 = venv bin dir. 0 iff python3 boots on exit.
  local bin="$1" marker src alias staged
  local py="$bin/python" py3="$bin/python3"
  if tcc_probe_python "$py3"; then TCC_HEAL_STATE="healthy"; return 0; fi
  marker="$bin/.tcc-anchor-source"
  [ -f "$marker" ] || { TCC_HEAL_STATE="no-marker"; return 1; }
  src="$(head -1 "$marker" 2>/dev/null)"
  case "$src" in
    "$bin"/*) TCC_HEAL_STATE="unsafe-source"; return 1 ;;
    /*) ;;
    *) TCC_HEAL_STATE="invalid-marker"; return 1 ;;
  esac
  if tcc_probe_python "$py"; then
    # #95541 alias-brick: the anchored copy itself boots; only the aliases
    # are dead. Aliases over a real-file anchor must be REAL FILES (hard
    # link, else copy) — an alias *symlink* onto the copy is the exact
    # crash shape being healed here.
    TCC_HEAL_STATE="healed-aliases"
    while IFS= read -r alias; do
      [ -n "$alias" ] || continue
      mv "$alias" "$alias.tcc-heal-old.$$" 2>/dev/null \
        || { tcc_heal_rollback "$bin"; TCC_HEAL_STATE="failed"; return 1; }
      if ! { ln "$py" "$alias" 2>/dev/null || cp -p "$py" "$alias" 2>/dev/null; }; then
        tcc_heal_rollback "$bin"; TCC_HEAL_STATE="failed"; return 1
      fi
    done <<EOF_ALIASES
$(tcc_alias_names "$bin")
EOF_ALIASES
  elif [ -x "$src" ] && tcc_probe_python "$src"; then
    # Full restore to the pre-anchor layout: python → symlink to the
    # marker-recorded store interpreter, aliases → symlinks to python.
    TCC_HEAL_STATE="healed-symlinks"
    mv "$py" "$py.tcc-heal-old.$$" 2>/dev/null \
      || { TCC_HEAL_STATE="failed"; return 1; }
    if ! ln -s "$src" "$py" 2>/dev/null; then
      tcc_heal_rollback "$bin"; TCC_HEAL_STATE="failed"; return 1
    fi
    while IFS= read -r alias; do
      [ -n "$alias" ] || continue
      staged="$alias.tcc-heal-new.$$"
      mv "$alias" "$alias.tcc-heal-old.$$" 2>/dev/null \
        || { tcc_heal_rollback "$bin"; TCC_HEAL_STATE="failed"; return 1; }
      if ! { ln -s python "$staged" 2>/dev/null && mv "$staged" "$alias" 2>/dev/null; }; then
        rm -f "$staged" 2>/dev/null
        tcc_heal_rollback "$bin"; TCC_HEAL_STATE="failed"; return 1
      fi
    done <<EOF_ALIASES
$(tcc_alias_names "$bin")
EOF_ALIASES
  else
    # Recorded source gone or itself unbootable (the vanished-uv-store
    # class from #95759): fail closed, touch nothing.
    TCC_HEAL_STATE="source-missing"; return 1
  fi
  if tcc_probe_python "$py3"; then
    if [ "$TCC_HEAL_STATE" = "healed-symlinks" ]; then
      # Marker asserts the anchored layout; the symlink layout is done
      # with it. (The alias-heal branch KEEPS it: real-file python +
      # real-file aliases is exactly the layout ensure_tcc_anchor marks.)
      rm -f "$marker" 2>/dev/null || true
    fi
    tcc_heal_cleanup "$bin"
    return 0
  fi
  tcc_heal_rollback "$bin"
  TCC_HEAL_STATE="failed"
  return 1
}

tcc_pick_update_invoke() { # sets UPDATE_INVOKE; safety net past a failed heal
  # Last-resort class: aliases still dead but the anchored copy boots. The
  # launchd gateway proves `venv/bin/python -m hermes_cli.main` works when
  # every alias entrypoint is bricked — drive the update the same way.
  local bin="$1"
  UPDATE_INVOKE=("$bin/hermes")
  if ! tcc_probe_python "$bin/python3" && tcc_probe_python "$bin/python"; then
    UPDATE_INVOKE=("$bin/python" -m hermes_cli.main)
  fi
}

# ── self-tests: no update, touch nothing ────────────────────────────────────
if [ "$SELF_TEST_TCC_HEAL" -eq 1 ]; then
  # Runs the REAL heal + invoke selection against --install-root and reports;
  # tests/test_desktop_update_tcc_heal.py drives the state matrix through it.
  trap - EXIT
  tcc_anchor_heal "$INSTALL_ROOT/venv/bin" || true
  tcc_pick_update_invoke "$INSTALL_ROOT/venv/bin"
  echo "state=$TCC_HEAL_STATE invoke=${UPDATE_INVOKE[*]}"
  exit 0
fi

if [ "$SELF_TEST_GATE" -eq 1 ]; then
  # Prints the gate decision for the given --install-root/--relaunch-target
  # and exits; scripts/desktop-update/repro.sh gate asserts the matrix.
  trap - EXIT
  linux_gate
  echo "$GATE${GATE_MSG:+:$GATE_MSG}"
  exit 0
fi

if [ "$SELF_TEST_UI" -eq 1 ]; then
  start_ui
  log "SELF-TEST: shim simulation (no update will run)"
  sleep "${HERMES_SELFTEST_HOLD_SECONDS:-6}"
  RELAUNCH_TARGET=""
  if [ -n "${HERMES_SELFTEST_FAIL:-}" ]; then FINAL_MSG="self-test error state"
  else FINAL_CODE=0 FINAL_MSG="self-test complete"; fi
  exit "$FINAL_CODE"
fi

# ── the actual job ──────────────────────────────────────────────────────────
# Electron's macOS quit teardown sends SIGTERM to its still-parented updater
# child on this machine. `detached + unref` gives the child a process group but
# does not re-parent it before `before-quit` runs, so the hand-off consistently
# died two seconds after starting `hermes update`. Re-exec through a one-shot
# setsid child and let this direct Electron child exit first. The real
# orchestrator is then owned by launchd (PPID 1) and is outside Electron's quit
# teardown, while retaining the same marker/result protocol.
if [ "$HANDOFF_DAEMONIZED" -ne 1 ]; then
  # This launcher is disposable. In particular it must not run finish() on
  # EXIT: that would publish a false failure and relaunch Hermes while the
  # re-parented orchestrator is only just starting.
  trap - EXIT HUP INT QUIT TERM
  # --daemonized must precede ORIGINAL_ARGS, not follow it: ORIGINAL_ARGS may
  # contain a `--` separator (Linux relaunch args), and anything appended
  # after that point is swallowed into RELAUNCH_ARGS instead of being parsed
  # as a flag. Appending here previously left HANDOFF_DAEMONIZED unset on
  # every re-exec, causing this block to re-fire forever (self-exec loop,
  # unbounded argv growth) whenever relaunch args were present.
  /usr/bin/nohup /usr/bin/python3 -c '
import os, sys
env = os.environ.copy()
os.setsid()
os.execve("/bin/bash", ["/bin/bash", sys.argv[1], *sys.argv[2:]], env)
' "$SCRIPT_DIR/posix.sh" --daemonized "${ORIGINAL_ARGS[@]}" >/dev/null 2>&1 &
  exit 0
fi

# Electron terminates the entire detached updater process group during quit,
# including the loopback status server.  Arm TERM immunity before `start_ui`
# so the shim server and the later `hermes update` subprocess both inherit
# SIG_IGN.  The orchestrator restores its normal TERM handler after the update
# command has returned; the already-running server keeps the inherited setting
# until normal cleanup closes it.
trap '' TERM
log "hand-off start: root=$INSTALL_ROOT branch=$BRANCH desktopPid=$DESKTOP_PID pid=$$"
rm -f "$RESULT" 2>/dev/null || true

# Marker claim: same cross-process lock contract as windows.ps1 /
# update_lock.py (the `hermes update` child adopts it via process ancestry).
# The Desktop supplies one acquisition time for the whole ownership chain.
NOW="$(date +%s)"
STARTED_AT="${HERMES_UPDATE_STARTED_AT:-$NOW}"
case "$STARTED_AT" in ''|*[!0-9]*) STARTED_AT="$NOW" ;; esac
MIN_STARTED_AT=$((NOW - 1200))
# Compare the validated decimal strings before doing arithmetic. Shell integer
# expansion can wrap on an attacker-controlled value wider than signed 64-bit.
if [ "${#STARTED_AT}" -ne "${#NOW}" ] \
    || [[ "$STARTED_AT" > "$NOW" || "$STARTED_AT" < "$MIN_STARTED_AT" ]]; then
  STARTED_AT="$NOW"
fi
printf '%s\n%s\n' "$$" "$STARTED_AT" > "$MARKER" 2>/dev/null || log "WARNING: could not write update marker"

if [ "$SELF_TEST_MARKER" -eq 1 ]; then
  trap - EXIT
  exit 0
fi

# Wait out the Desktop (FAIL CLOSED: updating under live backends bricks).
if [ "$DESKTOP_PID" -gt 0 ] 2>/dev/null; then
  for _ in $(seq 1 100); do kill -0 "$DESKTOP_PID" 2>/dev/null || break; sleep 0.3; done
  if kill -0 "$DESKTOP_PID" 2>/dev/null; then
    FINAL_CODE=4 FINAL_MSG="Update aborted: the Hermes window (pid $DESKTOP_PID) did not exit within 30s. Nothing was changed. Close Hermes fully and try again."
    log "$FINAL_MSG"; exit "$FINAL_CODE"
  fi
fi

# Do not create Chrome until Electron has fully left.  During its 2.5s quit
# dwell/before-quit teardown macOS can terminate descendants of the hand-off;
# a Chrome renderer reports that SIGTERM as "Aw, Snap!" error code 15.  The
# update marker above prevents a second click during this short UI-less gap.
sleep 1
start_ui

HERMES_BIN="$INSTALL_ROOT/venv/bin/hermes"
[ -x "$HERMES_BIN" ] || { FINAL_CODE=3 FINAL_MSG="Update aborted: $HERMES_BIN is missing. The install needs repair (run the Hermes installer or hermes doctor)."; log "$FINAL_MSG"; exit 3; }

# Heal a venv the reverted TCC anchor left bricked BEFORE invoking the CLI:
# venv/bin/hermes execs venv/bin/python3, so a dead alias kills every attempt
# and its retry identically (#95759). macOS-only artifact; probe is cheap.
if [ "$(uname)" = "Darwin" ]; then
  if tcc_anchor_heal "$INSTALL_ROOT/venv/bin"; then
    case "$TCC_HEAL_STATE" in
      healed-*) log "TCC anchor self-heal repaired the venv interpreter ($TCC_HEAL_STATE)" ;;
    esac
  else
    log "TCC anchor self-heal could not repair the venv ($TCC_HEAL_STATE)"
  fi
fi
tcc_pick_update_invoke "$INSTALL_ROOT/venv/bin"
if [ "${UPDATE_INVOKE[0]}" != "$HERMES_BIN" ]; then
  log "venv/bin/python3 still unbootable; invoking the update via ${UPDATE_INVOKE[*]}"
fi

# Run FROM the install root: `hermes update` resolves the tree it mutates
# from the working directory, and we inherit the Desktop's cwd (which can be
# an unrelated repo — updating THAT instead of the install is the failure
# the sandbox repro caught). FAIL CLOSED: set -u without set -e means a
# failed cd would otherwise continue in the wrong tree — the exact class
# this correction exists to eliminate.
cd "$INSTALL_ROOT" || {
  FINAL_CODE=3 FINAL_MSG="Update aborted: cannot enter the install root ($INSTALL_ROOT). Nothing was changed."
  log "$FINAL_MSG"; exit 3
}
export PYTHONUNBUFFERED=1
# --keep-stash: never re-apply local source edits after the update (they stay
# parked in git stash). Probe --help first: older installed backends don't
# know the flag and argparse would abort with exit 2, which collides with the
# "close all Hermes windows" sentinel.
KEEP_STASH=""
if "${UPDATE_INVOKE[@]}" update --help 2>/dev/null | grep -q -- '--keep-stash'; then
  KEEP_STASH="--keep-stash"
else
  log "installed hermes predates --keep-stash; running without it"
fi
log "running: ${UPDATE_INVOKE[*]} update --yes --gateway $KEEP_STASH --branch $BRANCH"
publish_stage "Updating code and dependencies"
OUT="$("${UPDATE_INVOKE[@]}" update --yes --gateway $KEEP_STASH --branch "$BRANCH" 2>&1)"; CODE=$?
printf '%s\n' "$OUT" >> "$LOG" 2>/dev/null
log "hermes update exit code: $CODE"

if [ "$CODE" -ne 0 ] && [ "$CODE" -ne 2 ]; then
  # Retry once: update-boundary class (fresh code on disk, stale in memory).
  # Exit 2 ("close all Hermes windows") is not retryable.
  #
  # A parked-branch SKIP (checkout on a feature branch with unmerged
  # commits) is also deterministic — the retry would hit the exact same
  # branch state and skip again, so it only wastes time. Detect the skip
  # by its banner, skip the retry, and surface an honest message with a
  # dedicated exit code (8) so callers can distinguish "skipped" from a
  # real failure.
  if printf '%s' "$OUT" | grep -q "CODE UPDATE SKIPPED"; then
    log "hermes update skipped (checkout parked on a non-target branch); not retrying"
    FINAL_CODE=8
    FINAL_MSG="Update skipped: the git checkout is on a branch that isn't fully merged into $BRANCH. Switch to the target branch and update again (see the terminal output for the exact commands)."
    exit 8
  fi
  log "retrying once (freshly pulled fix loads on the second run)"
  publish_stage "Retrying update"
  OUT="$("${UPDATE_INVOKE[@]}" update --yes --gateway $KEEP_STASH --branch "$BRANCH" 2>&1)"; CODE=$?
  printf '%s\n' "$OUT" >> "$LOG" 2>/dev/null
  log "retry exit code: $CODE"
fi
trap 'on_signal TERM' TERM

# Truthful completion: `hermes update` calls a GUI build failure non-fatal
# (exit 0). For a Desktop-driven update that would relaunch the OLD build
# and call it success -- retry the build once, propagate honestly.
if [ "$CODE" -eq 0 ] && printf '%s' "$OUT" | grep -q "Desktop build failed"; then
  log "desktop build failed inside hermes update; retrying build"
  publish_stage "Rebuilding Desktop"
  "${UPDATE_INVOKE[@]}" desktop --force-build --build-only >> "$LOG" 2>&1 || {
    FINAL_CODE=6 FINAL_MSG="Code and dependencies updated, but the Desktop app rebuild failed - you are running the previous build. Run hermes desktop --force-build from a terminal to retry."
    exit 6
  }
fi

if [ "$CODE" -eq 0 ]; then FINAL_CODE=0 FINAL_MSG="Update complete."
else
  FINAL_CODE="$CODE" FINAL_MSG="Update failed (exit $CODE). Run hermes debug share in a terminal to send a report."
  # The bricked-venv class is fixable and must not read as a generic exit 1:
  # a dead interpreter with a failed/impossible heal means retrying can never
  # succeed — tell the user what is actually wrong (#95759).
  if ! tcc_probe_python "$INSTALL_ROOT/venv/bin/python3" \
      && ! tcc_probe_python "$INSTALL_ROOT/venv/bin/python"; then
    FINAL_MSG="Update failed: the Python interpreter inside $INSTALL_ROOT/venv cannot start (heal state: $TCC_HEAL_STATE). Reinstall the runtime with the Hermes installer, or run hermes doctor --fix from a terminal if any hermes command still works."
  fi
fi
exit "$FINAL_CODE"