Run the refresh hook before its transaction and keep the inhibitor through user work

Three review findings on the update-hook boundary:

The pre-refresh-pacman hook had been moved after the refresh transaction
and, during a channel switch, deferred to the very end. That defeated the
hook's purpose: custom repositories and IgnorePkg entries were not in
place when the downgrade-capable -Syyuu ran. Run the hook where it used
to run, after the package config is re-synced and before the transaction,
but cold: revoke the timestamp, run it behind the no-update wrapper with
the caller's original PATH, and revoke again before continuing. Every
later privileged command authenticates with --no-update, so a detached
child left by the hook has no reusable timestamp to wait for. Channel
switching hands the caller's PATH to the refresh the same way the updater
receives it, and no longer defers or re-runs the hook.

Stay Awake was released before AUR builds, hooks and mise, so the machine
could sleep during the longest part of an update. Releasing the inhibitor
needs no privilege because the held command already dropped to the user,
so stop it after mise and before the reboot prompt, as before.

A packaged channel destination cannot be inspected before its package is
installed, and a transaction can replace the running tree with a release
that predates the command-scoped wrapper; from then on a bare sudo would
resolve to /usr/bin/sudo and publish a timestamp, and the destination's
own updater authenticates the same way. The switch used to abort only
after the packages had changed, with generic rerun advice. Now it checks
for the wrapper after each transaction before any further privileged
step, completes what it safely can, and stops cold with instructions to
run that release's update from a fresh session instead of launching it.

Boundary tests pin the hook between the config copies and the transaction
with a cold timestamp on both sides, the older-destination stop with its
guidance and no launched updater, the new inhibitor position, and the
post-update hook staying unreached on failures and signals. Docs, the
manual and the sample hook describe the restored timing.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

test/shell.d/channel-sudo-boundary-test.sh

@@ -47,8 +47,12 @@ sudo = [event for event in events if event.startswith('sudo ')]
 assert all(event in ('sudo -h', 'sudo -k') or event.startswith('sudo -N ') for event in sudo), events
 hooks = [i for i, event in enumerate(events) if event.startswith('step:omarchy-hook ')]
 assert len(hooks) == 2, events
-assert events[hooks[-1]] == 'step:omarchy-hook pre-refresh-pacman', events
-assert not any(event.startswith('sudo -N ') for event in events[hooks[0]:]), events
+assert events[hooks[0]] == 'step:omarchy-hook pre-refresh-pacman', events
+assert events[hooks[1]] == 'step:omarchy-hook post-update', events
+assert events[hooks[0] - 1] == 'sudo -k' and events[hooks[0] + 1] == 'sudo -k', events
+transaction = next(i for i, event in enumerate(events) if event.startswith('step:pacman '))
+assert hooks[0] < transaction, events
+assert not any(event.startswith('sudo -N ') for event in events[hooks[1]:]), events
 PY
 }
 
@@ -59,7 +63,7 @@ for channel in stable rc edge dev; do
   reset_boundary
   run_channel "$channel" || fail "$channel failed" "$(<"$boundary_tmp/output")"
   assert_scoped_channel "$channel"
-  pass "$channel starts cold, authorizes only individual commands, defers hooks and exits cold"
+  pass "$channel starts cold, authorizes only individual commands, runs the refresh hook cold before its transaction and exits cold"
 done
 
 reset_boundary
@@ -79,6 +83,59 @@ OMARCHY_PATH="$SUDO_TEST_HOME/omarchy" run_channel stable || fail "leaving dev f
 assert_scoped_channel "dev to stable"
 pass "leaving dev preserves no-update sudo through unlink and the packaged update"
 
+# A packaged destination that predates the wrapper cannot be checked before its
+# package is installed. Its updater authenticates without --no-update, so the
+# switch must not launch it: it stops at a consistent point with instructions.
+reset_boundary
+mv "$SUDO_TEST_ROOT/default/omarchy/sudo-no-update/sudo" "$boundary_tmp/saved-package-wrapper"
+mv "$SUDO_TEST_ROOT/bin/omarchy-update" "$boundary_tmp/saved-package-update"
+ln -s test-step "$SUDO_TEST_ROOT/bin/omarchy-update"
+if OMARCHY_PATH="$SUDO_TEST_HOME/omarchy" run_channel stable; then fail "an older packaged destination was updated with ordinary sudo" "$(<"$SUDO_TEST_LOG")"; fi
+grep -q "predates command-scoped sudo" "$boundary_tmp/output" || fail "an older packaged destination was not reported" "$(<"$boundary_tmp/output")"
+grep -q "Run 'omarchy update' from a new terminal to finish" "$boundary_tmp/output" || fail "an older packaged destination lacks recovery guidance" "$(<"$boundary_tmp/output")"
+grep -Fxq 'step:omarchy-dev-unlink --no-reboot' "$SUDO_TEST_LOG" || fail "the package switch was not completed before stopping" "$(<"$SUDO_TEST_LOG")"
+grep -Fxq 'step:omarchy-state set reboot-required' "$SUDO_TEST_LOG" || fail "leaving dev for an older release did not mark the reboot" "$(<"$SUDO_TEST_LOG")"
+if grep -q '^step:omarchy-update ' "$SUDO_TEST_LOG"; then fail "an older packaged updater was launched from the hardened switch" "$(<"$SUDO_TEST_LOG")"; fi
+grep -q 'The channel switch did not complete' "$boundary_tmp/output" && fail "the stop was reported as an error needing a rerun" "$(<"$boundary_tmp/output")"
+assert_boundary_cold "older packaged destination"
+rm "$SUDO_TEST_ROOT/bin/omarchy-update"
+mv "$boundary_tmp/saved-package-update" "$SUDO_TEST_ROOT/bin/omarchy-update"
+mv "$boundary_tmp/saved-package-wrapper" "$SUDO_TEST_ROOT/default/omarchy/sudo-no-update/sudo"
+pass "an older packaged destination stops the switch cold with instructions instead of running its updater"
+
+# A package-backed source can be downgraded by its own transaction to a release
+# without the wrapper. From then on a bare sudo would be the real one, so no
+# privileged step may follow either transaction without checking first. A decoy
+# sudo in the package bin catches any such call instead of reaching the host.
+cat >"$SUDO_TEST_ROOT/bin/sudo" <<'STUB'
+#!/bin/bash
+printf 'unwrapped-sudo %s\n' "$*" >>"$SUDO_TEST_LOG"
+exit 97
+STUB
+chmod +x "$SUDO_TEST_ROOT/bin/sudo"
+cp "$SUDO_TEST_ROOT/default/omarchy/sudo-no-update/sudo" "$boundary_tmp/saved-package-wrapper"
+for pattern in 'pacman -Syyuu*' 'pacman -S --needed*'; do
+  reset_boundary
+  export SUDO_TEST_REMOVE_WRAPPER_STEP=$pattern
+  if run_channel rc; then fail "a downgrade during '$pattern' was not detected" "$(<"$SUDO_TEST_LOG")"; fi
+  unset SUDO_TEST_REMOVE_WRAPPER_STEP
+  grep -q "predates command-scoped sudo" "$boundary_tmp/output" || fail "downgrade during '$pattern' was not reported" "$(<"$boundary_tmp/output")"
+  if grep -q '^unwrapped-sudo ' "$SUDO_TEST_LOG"; then fail "downgrade during '$pattern' reached ordinary sudo" "$(<"$SUDO_TEST_LOG")"; fi
+  if grep -q '^step:omarchy-dev-unlink' "$SUDO_TEST_LOG"; then fail "downgrade during '$pattern' still unlinked" "$(<"$SUDO_TEST_LOG")"; fi
+  if grep -q '^step:omarchy-update ' "$SUDO_TEST_LOG"; then fail "downgrade during '$pattern' still updated" "$(<"$SUDO_TEST_LOG")"; fi
+  python3 - "$SUDO_TEST_LOG" "$pattern" <<'PY'
+import sys
+events = open(sys.argv[1]).read().splitlines()
+transactions = [e for e in events if e.startswith('step:pacman ')]
+assert len(transactions) == (1 if sys.argv[2].startswith('pacman -Syyuu') else 2), events
+assert all(e in ('sudo -h', 'sudo -k') or e.startswith('sudo -N ') for e in events if e.startswith('sudo ')), events
+PY
+  assert_boundary_cold "downgrade during $pattern"
+  cp "$boundary_tmp/saved-package-wrapper" "$SUDO_TEST_ROOT/default/omarchy/sudo-no-update/sudo"
+  pass "a transaction that removes the wrapper stops the switch before any further sudo ($pattern)"
+done
+rm "$SUDO_TEST_ROOT/bin/sudo"
+
 mkdir "$boundary_tmp/user tools"
 cat >"$boundary_tmp/user tools/channel-user-tool" <<'STUB'
 #!/bin/bash
@@ -110,8 +167,8 @@ for step in pacman omarchy-update-system-pkgs omarchy-hook; do
   reset_boundary
   if SUDO_TEST_FAIL_STEP="$step" run_channel stable; then fail "$step failure was ignored"; fi
   assert_boundary_cold "$step failure"
-  if grep -q '^step:omarchy-hook pre-refresh-pacman$' "$SUDO_TEST_LOG"; then fail "$step failure reached the deferred hook"; fi
-  pass "$step failure exits cold without the deferred hook"
+  if grep -q '^step:omarchy-hook post-update$' "$SUDO_TEST_LOG"; then fail "$step failure reached the post-update hook"; fi
+  pass "$step failure exits cold without the post-update hook"
 done
 
 for signal in HUP INT TERM; do
@@ -123,7 +180,7 @@ kill -s "$SUDO_TEST_CHANNEL_SIGNAL" "$PPID"
 STUB
   if SUDO_TEST_CHANNEL_SIGNAL="$signal" run_channel stable; then fail "$signal was ignored"; fi
   assert_boundary_cold "$signal"
-  if grep -q '^step:omarchy-hook ' "$SUDO_TEST_LOG"; then fail "$signal reached an update hook"; fi
+  if grep -q '^step:omarchy-hook post-update$' "$SUDO_TEST_LOG"; then fail "$signal reached the post-update hook"; fi
   pass "$signal stops the channel transition and revokes authorization"
 done