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fix(command-loop): report command errors literally and survive a failed report - #489
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…ed report command-error-default-function passed the rendered diagnostic to `message' as its format string. An error whose text contains `%' -- a buffer named `#chan%irc.example', or (error "%s" "50% off") -- made the report itself signal a format error. command_loop_2 propagated any failure of the reporter, so the outermost command loop returned an error and the session exited with status 0, without kill-emacs-hook. Pass the text as an argument, as GNU print_error_message writes it literally. Independently, route a signal raised while reporting a command error (from command_loop_2 or top_level_1) to a top-level throw: in GNU, cmd_error runs after the condition-case has unwound, so such a signal finds no handler and signal_or_quit throws to top-level, which command_loop catches. A buggy command-error-function can no longer end the session. Also log the error when the command loop exits with one, so the next unexpected exit says why.
…d reports A signal raised while reporting a command error was always turned into a top-level throw. GNU signal_or_quit throws to top-level only when no handler matches; cmd_error runs after the command loop's own condition-case has unwound, so a condition-case around a recursive-edit still receives the signal. Dispatch the signal and propagate it when a handler was selected. GNU command_loop also runs its batch check after the catch around command_loop_2 returns, whether normally or from a top-level throw. The loop restarted on every top-level throw, so a batch session whose report failed kept reading commands instead of exiting. Run the batch check on a caught top-level throw as well. The survival tests now run an interactive loop (with an input channel) instead of relying on batch mode, and new tests cover the enclosing handler and the batch exit.
…l once A builtin's signal reaches the reporter undispatched, as the % format error did. Check that rerouting gives it the normal dispatch once, signal-hook-function included, and does not dispatch an already dispatched signal again.
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe command loop routes error-reporter failures through signal dispatch and top-level recovery. Failed reports affect batch shutdown status. Default diagnostics use a literal format string. GUI and TTY shutdown logs include exit errors. ChangesCommand-loop error handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant CommandLoop
participant command_error_report_failure
participant SignalDispatch
participant command_loop_inner
CommandLoop->>command_error_report_failure: Pass error-reporting failure
command_error_report_failure->>SignalDispatch: Dispatch reporter signal
SignalDispatch-->>command_error_report_failure: Return handler result or no handler
command_error_report_failure-->>CommandLoop: Preserve handler or nonlocal-exit result
command_error_report_failure-->>CommandLoop: Set error_report_failed and throw to top-level
CommandLoop-->>command_loop_inner: Propagate top-level throw
command_loop_inner-->>command_loop_inner: Restart interactive loop or return in batch mode
Merge Risk: ⚪ Minimal · up to No PR-specific merge blocker is established. Runtime status of the reported idle-timeout failure remains unknown, though its test and relevant auto-save path are unchanged from the PR base. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change improves error-reporting resilience and prevents a failed report from producing a successful batch exit. No new privilege escalation or trust-boundary bypass was established. Remaining uncertainty concerns host integration and behavior not exercised during this review. Retained concerns Security review detailsSecurity Blast Radius
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thanos already carries the content of these heads, verbatim or as the personal variant it ships; this merge keeps the tree and records the heads so later upstream merges of them need no re-resolution. - contrib/repeat-backpressure 551220e (eval-exec#459): carried; the rebase only moved to FrontendKey, as the main merge did. - contrib/nested-reader-recovery 91a4022 (eval-exec#460): carried, combined with the command-error reporting below. - fix/command-error-literal-message 271a202 (eval-exec#489): carried as 56339fa, 98b7742, 0ebd026. - fix/non-ascii-face-width 9a52a76 (eval-exec#481): carried as 13ad539 and 7eee365. - feature/builtin-mcp c9542d3 (eval-exec#480): personal endpoint variant with the same reply bound (677591e) and documentation (e0ee6c3). - fix/text-prop-interval-recycling 38b1e0a (eval-exec#479): personal interval recycling passes the same retention tests. - feature/gui-daemon-publication 1cd96f8 (eval-exec#454): personal deferred GUI daemon, a superset. Kept deliberately: terminal-live-p classifies every terminal by its output method (GNU Fterminal_live_p), an unregistered frame's native-window wait fails closed, and neomacs-set-frame-opacity passes integer percentages through unchanged, since alpha-background already reads a fixnum as a percentage (GNU gui_set_alpha_background).
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@crates/neovm-core/src/emacs_core/runtime/eval/command_loop.rs:
- Around line 284-303: Update `command_loop_inner` so a caught top-level throw
in noninteractive mode reaches `builtin_kill_emacs` with a nonzero fixnum exit
status, while normal EOF continues to use `Value::T`. Preserve the interactive
restart behavior.
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…report When reporting a command error signals, the report becomes a top-level throw, and the batch check then ended the session with (kill-emacs t), so the process reported success after an error. Record that the report failed and end with (kill-emacs -1), the status of a plain batch error. A deliberate (top-level) and a clean end of input still exit 0. GNU keeps reading here and never exits.
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A command error whose text contains
%, such as(error "%s" "50% off")orkill-regionon read-only text in a buffer named like#chan%irc, was passed tomessageas its format string. The format error raised inside the reporter escapedcommand_loop_2and ended the session with exit status 0.The reporter now prints the text literally with
("%s" text). A signal raised while reporting is dispatched once, at bothcommand_loop_2andtop_level_1: it goes to a selected enclosing handler if there is one, otherwise it becomes(throw 'top-level t), as GNUsignal_or_quitdoes oncecmd_error's condition-case has unwound. In batch mode a caught top-level throw runs the kill-emacs check instead of restarting, as in GNUcommand_loop. After a failed report that check exits with status 255, like a plain batch error, rather than 0. (GNU hangs in that case.) The exit log records the error.Tests on
0cd0a73339:cargo nextest run -p neovm-core --lib -E 'test(/command_error/) | test(/command_loop_/)'runs 44 tests, 43 pass. The one failure,command_loop_idle_timeout_triggers_auto_save_hook, fails the same way on main without this change.Overlap with #460: both change the two
self.report_command_error(data, "")?calls intop_level_1andcommand_loop_2. To resolve, keep this PR's failure handling and put #460's quit-flag andinhibit-quitrelease after it, so the release runs only after a successful report, as in GNUkeyboard.ccmd_error:With both PRs applied this way on
0cd0a73339, the focused tests of both (67) pass apart from that same baseline failure. I'll rebase whichever of the two lands second.This PR is agent-assisted.