Update man to add the manual guide

kernel/bin/cp

@@ -0,0 +1,148 @@
+/** 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
+}
+
+async function copyPath(ctx, from, to, recursive) {
+  const st = await ctx.vfs.lstat(from)
+  if (!st) {
+    ctx.console.error('cp: ' + from + ': No such file')
+    return false
+  }
+  if (st.type === 'symlink') {
+    const t = await ctx.vfs.readlink(from)
+    await ctx.vfs.symlink(t, to)
+    return true
+  }
+  if (st.type === 'file') {
+    const buf = await ctx.vfs.readFile(from)
+    if (!buf) {
+      ctx.console.error('cp: cannot read ' + from)
+      return false
+    }
+    await ctx.vfs.writeFile(to, buf)
+    return true
+  }
+  if (st.type === 'directory') {
+    if (!recursive) {
+      ctx.console.error('cp: ' + from + ': Is a directory')
+      return false
+    }
+    await ctx.vfs.mkdir(to, { recursive: true })
+    const names = await ctx.vfs.readdir(from)
+    for (const n of names) {
+      if (n === '.bareos_empty') continue
+      const f = from.replace(/\/+$/, '') + '/' + n
+      const t = to.replace(/\/+$/, '') + '/' + n
+      if (!(await copyPath(ctx, f, t, true))) return false
+    }
+    return true
+  }
+  return false
+}
+
+async function run(ctx, argv) {
+  let recursive = false
+  const paths = []
+  for (let i = 1; i < argv.length; i++) {
+    const a = argv[i]
+    if (a === '-R' || a === '-r' || a === '--recursive') {
+      recursive = true
+      continue
+    }
+    if (a === '--') {
+      paths.push(...argv.slice(i + 1))
+      break
+    }
+    if (a.startsWith('-')) {
+      ctx.console.error('cp: unsupported option ' + a)
+      ctx.exitCode = 1
+      return
+    }
+    paths.push(a)
+  }
+  if (paths.length < 2) {
+    ctx.console.error('usage: cp [-R] SOURCE... DEST')
+    ctx.exitCode = 1
+    return
+  }
+  const dest = paths.pop()
+  const sources = paths
+  let destIsDir = false
+  try {
+    const dst = await ctx.vfs.lstat(dest)
+    destIsDir = !!(dst && dst.type === 'directory')
+  } catch {
+    destIsDir = false
+  }
+  if (sources.length > 1 && !destIsDir) {
+    ctx.console.error('cp: target is not a directory')
+    ctx.exitCode = 1
+    return
+  }
+  for (const src of sources) {
+    const base = src.replace(/\/+$/, '').split('/').pop() || src
+    const target =
+      destIsDir || sources.length > 1
+        ? dest.replace(/\/+$/, '') + '/' + base
+        : dest
+    if (!(await copyPath(ctx, src, target, recursive))) ctx.exitCode = 1
+  }
+}