bare-operating-system/packages/bare-os-seeder/kernel/bin/timeout

/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
function bareStdin(ctx) {
  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
}

/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
function bareFormatModeString(mode, type) {
  const typeChar = type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
  const perm = mode & 0o777
  const r = (bit) => (perm & bit ? 'r' : '-')
  const w = (bit) => (perm & bit ? 'w' : '-')
  const x = (bit) => (perm & bit ? 'x' : '-')
  return (
    typeChar +
    r(0o400) +
    w(0o200) +
    x(0o100) +
    r(0o040) +
    w(0o020) +
    x(0o010) +
    r(0o004) +
    w(0o002) +
    x(0o001)
  )
}

/** @param {number} mtimeMs @param {number} [nowMs] */
function bareFormatLsMtime(mtimeMs, nowMs) {
  const now = nowMs != null ? nowMs : Date.now()
  const d = new Date(mtimeMs)
  const months = [
    'Jan',
    'Feb',
    'Mar',
    'Apr',
    'May',
    'Jun',
    'Jul',
    'Aug',
    'Sep',
    'Oct',
    'Nov',
    'Dec'
  ]
  const mon = months[d.getMonth()]
  const day = String(d.getDate()).padStart(2, ' ')
  const sixMo = 180 * 24 * 3600 * 1000
  if (Math.abs(now - mtimeMs) > sixMo) {
    const yr = String(d.getFullYear()).padStart(4, ' ')
    return mon + ' ' + day + '  ' + yr
  }
  const hh = String(d.getHours()).padStart(2, '0')
  const mm = String(d.getMinutes()).padStart(2, '0')
  return mon + ' ' + day + ' ' + hh + ':' + mm
}

/** @param {number} size */
function barePosixBlocks(size) {
  return Math.ceil(Number(size) / 512) || 0
}

/**
 * Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
 * If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
 * @param {Record<string, unknown>} ctx
 * @param {string | Uint8Array} chunk
 * @returns {boolean}
 */
function bareOsEmitRaw(ctx, chunk) {
  if (typeof ctx.bareOsBinWrite === 'function') {
    const b4 = ctx.b4a
    const u8 =
      typeof chunk === 'string'
        ? b4 && typeof b4.from === 'function'
          ? b4.from(chunk)
          : new TextEncoder().encode(chunk)
        : chunk
    ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
    return true
  }
  const w = globalThis.process?.stdout?.write
  if (typeof w === 'function') {
    w.call(globalThis.process.stdout, chunk)
    return true
  }
  return false
}

async function run(ctx, argv) {
  let i = 1
  while (i < argv.length) {
    const a = argv[i]
    if (a === '--') {
      i++
      break
    }
    if (a === '-k' || a === '--kill-after') {
      i += 2
      continue
    }
    if (a.startsWith('-')) {
      ctx.console.error('timeout: unsupported option: ' + a)
      ctx.exitCode = 125
      return
    }
    break
  }
  const durRaw = argv[i]
  if (durRaw == null) {
    ctx.console.error('usage: timeout DURATION COMMAND [ARG...]')
    ctx.exitCode = 125
    return
  }
  const dur = Number.parseFloat(durRaw)
  if (!Number.isFinite(dur) || dur < 0) {
    ctx.console.error('timeout: invalid duration')
    ctx.exitCode = 125
    return
  }
  const cmd = argv.slice(i + 1)
  if (!cmd.length) {
    ctx.console.error('timeout: missing command')
    ctx.exitCode = 125
    return
  }
  const timeoutMs = Math.min(
    Math.round(dur * 1000),
    24 * 3600 * 1000
  )
  const ac = new AbortController()
  let timedOut = false
  const timer = setTimeout(() => {
    timedOut = true
    ac.abort()
  }, timeoutMs)
  const priorExit = Number(ctx.exitCode) || 0
  try {
    if (typeof ctx.runBinCommand !== 'function') {
      ctx.console.error('timeout: runBinCommand is not available')
      ctx.exitCode = 125
      return
    }
    await ctx.runBinCommand(cmd, {
      signal: ac.signal,
      timeoutMs: timeoutMs + 500
    })
    if (timedOut) {
      ctx.exitCode = 124
    }
  } catch (e) {
    const name = e && /** @type {{ name?: string }} */ (e).name
    const msg = String((e && e.message) || e || '')
    if (timedOut || name === 'AbortError' || /abort/i.test(msg)) {
      ctx.exitCode = 124
    } else {
      ctx.exitCode = 1
    }
  } finally {
    clearTimeout(timer)
    if (timedOut && ctx.exitCode !== 124) ctx.exitCode = 124
    if (!timedOut && ctx.exitCode == null) ctx.exitCode = priorExit
  }
}