x-yuri

Setting breakpoints using Chrome DevTools Protocol

a.js:

const waitPort = require('wait-port');
const CDP = require('chrome-remote-interface');
const { spawn } = require('node:child_process');
const path = require('path');
const fs = require('fs');

x-yuri

Debugging a nextjs project with vscode and --turbo

Create a nextjs project:

next+14.2.5.patch (the name should match the nextjs version):

diff --git a/node_modules/next/dist/cli/.next-dev.js.swp b/node_modules/next/dist/cli/.next-dev.js.swp
new file mode 100644
index 0000000..59ed063

x-yuri

Debugging vscode-js-debug

Create a nextjs project:

next+14.2.5.patch (the name should match the nextjs version):

diff --git a/node_modules/next/dist/cli/.next-dev.js.swp b/node_modules/next/dist/cli/.next-dev.js.swp
new file mode 100644
index 0000000..59ed063

x-yuri

Parsing nodejs command line

a.mjs:

export default function getInspectInfo(nodeOptions, execArgv) {
    const args = (
        nodeOptions?.match(/(?<=^| )--inspect(-brk)?(=\S+)?(?= |$)/g) || []
    ).concat(execArgv.filter(
        a => a.startsWith('--inspect')

x-yuri

Splitting a command line into arguments

a.mjs:

// ", ', \ and (space) can be escaped with \
// \ before other symbols is removed
// inside double quotes " and \ can be escaped with \
// \ before other symbols remains
export default function splitCommandLine(l) {

x-yuri

PID 1 processes doesn't have default signal handlers

Dockerfile:

FROM alpine:3.20
COPY a.c .
RUN apk add build-base \
    && gcc a.c

x-yuri

sh template engines

bash-tpl

a.tpl:

a: <% $a %>
% if [ "$b" ]; then
b: <% $b %>

x-yuri

bash: interrupting commands with async subprocesses when job control is disabled

Subprocesses of async subshells don't inherit SIG_IGN after trap INT since bash-4.3-rc2:

h. Fixed a bug that caused SIGINT and SIGQUIT to not be trappable in asynchronous subshell commands.

https://git.savannah.gnu.org/cgit/bash.git/tree/CHANGES?h=bash-4.3-rc2&id=b6e23235f28b1c85e18e9a2b7ba8c6b6c46aecbc#n24

Before:

x-yuri

bash: interrupting commands with async subprocesses when job control is disabled

See [the new gist][d].

bash allows to override SIGINT in async subprocesses when job control is disabled since 4.3:

$ bash -c 'sleep 10 & wait'
$ ps -eHo pid,ppid,pgid,stat,ignored,args
    PID    PPID    PGID STAT          IGNORED COMMAND

x-yuri

bash: interrupting async subprocesses

a.sh:

trap - INT
while true; do
    echo -n .
    sleep 2
done