fix: do not relay a terminal's SIGINT to the child - #62
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Ctrl+C makes the terminal send SIGINT to the whole foreground process group, which holds both the lifecycle runner and the child it spawned. The runner then relayed the same SIGINT to the child, which received it twice. A child that handles the first SIGINT and lets the second one end it (a `process.once` handler, or a handler that treats a repeated Ctrl+C as "exit now") died before its shutdown finished. Node.js cannot tell who sent a signal, so the runner now checks whether it has a controlling terminal. With one, the terminal's interrupt already reached the child and nothing is relayed. Without one, only kill() can reach the runner, and the child still needs the relay, so that path is unchanged. Fixes pnpm/pnpm#7374 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds controlling-terminal detection to SIGINT handling. It adds interrupt fixtures and integration tests that cover terminal and non-terminal execution, graceful shutdown, timeout handling, and exit status. ChangesSIGINT handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Terminal
participant Lifecycle
participant ChildProcess
Terminal->>Lifecycle: Receive SIGINT
Lifecycle->>Lifecycle: Check controlling terminal
Lifecycle->>ChildProcess: Relay SIGINT only without a controlling terminal
ChildProcess-->>Lifecycle: Complete graceful shutdown
Merge Risk: 🔵 Low · up to The new shutdown test can intermittently miss its final confirmation output, reducing confidence in the SIGINT behavior. Wait for process stream closure before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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A sh that stays node's parent (dash 0.5.12, as on Debian and Ubuntu) takes the signals itself: Ctrl+C ends it while the script finishes, and a relayed SIGINT is held until its child exits, which it never does. Both are the shell's doing, so the fixture execs node and the tests measure the relay. Every assertion carries the child's output, and the no-terminal test kills the run after ten seconds instead of waiting. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
PR Summary by QodoPrevent duplicate SIGINT relay for terminal lifecycle runs
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In `@test/interrupt.test.js`:
- Line 23: Update the exited promise in the interrupt test to listen for the
child process close event instead of exit, ensuring stdout has closed before its
contents are asserted.
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📒 Files selected for processing (6)
index.jstest/fixtures/interrupt/dev.jstest/fixtures/interrupt/package.jsontest/fixtures/interrupt/run.mjstest/fixtures/interrupt/terminal.pytest/interrupt.test.js
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🪛 ast-grep (0.45.3)
test/interrupt.test.js
[warning] 2-2: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { spawn, spawnSync } from 'child_process'
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process)
[warning] 23-23: Avoid using the initial state variable in setState
Context: setTimeout(() => { proc.kill('SIGKILL') }, shutdownTimeout)
Note: [CWE-710] Improper Adherence to Coding Standards. Security best practice.
(setstate-same-var)
🪛 Ruff (0.16.5)
test/fixtures/interrupt/terminal.py
[error] 11-11: Starting a process without a shell
(S606)
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Import the lifecycle runner from pnpm/npm-lifecycle at 178f3d5 as @pnpm/exec.npm-lifecycle, so it is maintained alongside its consumer and a fix no longer needs a separate release. The source is converted to TypeScript with typed options, package data, log and child-process interfaces, which replaces the any-typed declaration in __typings__/local.d.ts. The legacy pkg._data unwrapping and the unused opts.config are dropped. The tests are ported to jest. The node-gyp wrappers ship with the package; the runner finds them beside lib in the package and in dist once the CLI bundle has flattened the module, where the CLI ships its own copy. The manifest updater keeps node-gyp-bin in the package's files. @yarnpkg/shell's declarations import micromatch's, so a packageExtensions entry gives it @types/micromatch. The Artistic-2.0 license is preserved. The imported code includes the fix for the terminal SIGINT being relayed to a script that already had it (pnpm/npm-lifecycle#62), which this brings to pnpm v11; a pseudo-terminal test covers it in the package and in the CLI. Related to #7374
Ctrl+C makes the terminal send SIGINT to the whole foreground process group, which holds both pnpm and the script it started. The relay in pnpm-executor's interrupt module then passed the same SIGINT on to the script, which received it twice. A script that handles the first SIGINT and lets a second one end it died before its shutdown finished. pnpm now skips the first relay to a child in its own process group when pnpm's process group is the foreground group of its controlling terminal, which is the group Ctrl+C interrupts as a whole. Signals aimed at pnpm alone (kill, without a terminal) are still relayed, as are signals to children in their own process groups, which the terminal never reaches. The escalation to SIGTERM and to ending pnpm is unchanged. siginfo cannot decide this portably: Linux marks the terminal's signals SI_KERNEL, but XNU fills si_code with 0 for kill() and the terminal alike, so the terminal's foreground group is asked instead. open, tcgetpgrp, getpgrp and close are async-signal-safe. The test runs pnpm as the foreground job of a pseudo-terminal and types Ctrl+C. The kill-based tests now start pnpm in a session without a terminal, so an interactive cargo test and CI exercise the same path. The pnpm v11 side is pnpm/npm-lifecycle#62, which reaches pnpm through #15113. Fixes #7374
1 participant
Fixes pnpm/pnpm#7374.
Ctrl+Cmakes the terminal sendSIGINTto the whole foreground process group, which holds both the lifecycle runner (pnpm) and the child it spawned. The runner then relayed the sameSIGINTto the child, which received it twice. A child that handles the firstSIGINTand lets the second one end it (aprocess.oncehandler, or a handler that treats a repeatedCtrl+Cas "exit now") died before its shutdown finished.Node.js cannot tell who sent a signal, so the runner now checks whether it has a controlling terminal. With one, the terminal's interrupt already reached the child and nothing is relayed. Without one (containers, service managers, CI), only
kill()can reach the runner, and the child still needs the relay, so that path is unchanged.Tests: one runs the lifecycle under a pseudo-terminal (via a small Python
ptyhelper) and pressesCtrl+C, asserting the child counts a single interrupt; the other sendsSIGINTto a runner without a terminal and asserts the child is still interrupted. Both are skipped on Windows.The pnpm v12 (Rust) side of the same fix is in pnpm/pnpm; the pnpm v11 side needs a release of this package and a catalog bump there.
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Summary by CodeRabbit
Bug Fixes
Tests