426 lines
12 KiB
Plaintext
426 lines
12 KiB
Plaintext
/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
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/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
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function bareStdin(ctx) {
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return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
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}
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/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
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function bareFormatModeString(mode, type) {
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const typeChar = type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
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const perm = mode & 0o777
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const r = (bit) => (perm & bit ? 'r' : '-')
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const w = (bit) => (perm & bit ? 'w' : '-')
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const x = (bit) => (perm & bit ? 'x' : '-')
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return (
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typeChar +
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r(0o400) +
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w(0o200) +
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x(0o100) +
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r(0o040) +
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w(0o020) +
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x(0o010) +
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r(0o004) +
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w(0o002) +
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x(0o001)
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)
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}
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/** @param {number} mtimeMs @param {number} [nowMs] */
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function bareFormatLsMtime(mtimeMs, nowMs) {
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const now = nowMs != null ? nowMs : Date.now()
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const d = new Date(mtimeMs)
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const months = [
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'Jan',
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'Feb',
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'Mar',
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'Apr',
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'May',
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'Jun',
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'Jul',
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'Aug',
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'Sep',
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'Oct',
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'Nov',
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'Dec'
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]
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const mon = months[d.getMonth()]
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const day = String(d.getDate()).padStart(2, ' ')
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const sixMo = 180 * 24 * 3600 * 1000
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if (Math.abs(now - mtimeMs) > sixMo) {
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const yr = String(d.getFullYear()).padStart(4, ' ')
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return mon + ' ' + day + ' ' + yr
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}
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const hh = String(d.getHours()).padStart(2, '0')
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const mm = String(d.getMinutes()).padStart(2, '0')
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return mon + ' ' + day + ' ' + hh + ':' + mm
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}
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/** @param {number} size */
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function barePosixBlocks(size) {
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return Math.ceil(Number(size) / 512) || 0
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}
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/**
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* Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
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* If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
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* @param {Record<string, unknown>} ctx
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* @param {string | Uint8Array} chunk
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* @returns {boolean}
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*/
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function bareOsEmitRaw(ctx, chunk) {
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if (typeof ctx.bareOsBinWrite === 'function') {
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const b4 = ctx.b4a
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const u8 =
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typeof chunk === 'string'
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? b4 && typeof b4.from === 'function'
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? b4.from(chunk)
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: new TextEncoder().encode(chunk)
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: chunk
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ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
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return true
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}
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const w = globalThis.process?.stdout?.write
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if (typeof w === 'function') {
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w.call(globalThis.process.stdout, chunk)
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return true
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}
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return false
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}
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/** Session env map (`vfs.env`, then `ctx.env`). Never throws. */
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function bareOsEnv(ctx) {
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const v = ctx && ctx.vfs && ctx.vfs.env
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if (v && typeof v === 'object') return v
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const e = ctx && ctx.env
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if (e && typeof e === 'object') return e
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return {}
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}
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/**
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* Strict POSIX-ish decimal integer (no octal, no exponent, no empty).
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* @param {unknown} s
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* @returns {number}
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*/
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function bareOsParseDecInt(s) {
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const t = String(s == null ? '' : s).trim()
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if (!/^[+-]?(?:0|[1-9][0-9]*)$/.test(t)) return NaN
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const n = Number.parseInt(t, 10)
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return Number.isSafeInteger(n) ? n : NaN
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}
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/** @param {unknown} s */
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function bareOsParseNonNegInt(s) {
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const n = bareOsParseDecInt(s)
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return n >= 0 ? n : NaN
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}
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/**
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* @param {Record<string, unknown>} ctx
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* @param {string} name
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* @param {number} fallback
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* @param {number} [min]
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* @param {number} [max]
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*/
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function bareOsEnvInt(ctx, name, fallback, min, max) {
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const raw = bareOsEnv(ctx)[name]
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if (raw == null || raw === '') return fallback
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const n = Number.parseInt(String(raw), 10)
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if (!Number.isFinite(n)) return fallback
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let v = n
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if (min != null && v < min) v = min
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if (max != null && v > max) v = max
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return v
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}
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/**
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* @param {Record<string, unknown>} ctx
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* @param {string} msg
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* @param {number} [code]
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*/
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function bareOsFail(ctx, msg, code) {
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if (msg) ctx.console.error(msg)
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ctx.exitCode = code == null ? 1 : code
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}
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/** @param {unknown} e */
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function bareOsIsNotFoundErr(e) {
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const code = e && typeof e === 'object' ? e.code : ''
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if (code === 'ENOENT') return true
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const msg = String((e && e.message) || e || '')
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return /ENOENT|No such file|not found/i.test(msg)
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}
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/**
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* @param {Record<string, unknown>} ctx
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* @param {unknown} buf
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* @returns {Uint8Array}
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*/
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function bareOsToU8(ctx, buf) {
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if (!buf) return new Uint8Array(0)
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if (buf instanceof Uint8Array) return buf
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if (ctx && ctx.b4a && typeof ctx.b4a.from === 'function') return ctx.b4a.from(buf)
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return new Uint8Array(buf)
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}
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/** @param {string} dir @param {string} name */
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function bareOsJoinPath(dir, name) {
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const d = String(dir || '').replace(/\/+$/, '')
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const n = String(name || '').replace(/^\/+/, '')
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if (!d || d === '/') return '/' + n
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return d + '/' + n
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}
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/** @param {string} p */
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function bareOsBaseName(p) {
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const t = String(p || '').replace(/\/+$/, '')
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if (!t || t === '/') return t === '/' ? '/' : ''
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const i = t.lastIndexOf('/')
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return i < 0 ? t : t.slice(i + 1) || t
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}
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/** @param {string} p */
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function bareOsParentDir(p) {
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const t = String(p || '').replace(/\/+$/, '') || '/'
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if (t === '/') return '/'
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const i = t.lastIndexOf('/')
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return i <= 0 ? '/' : t.slice(0, i) || '/'
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}
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/** @param {string} p */
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function bareOsNormPath(p) {
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return String(p || '').replace(/\/+$/, '') || '/'
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}
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/**
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* @param {Record<string, unknown>} ctx
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* @param {string} p
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*/
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function bareOsResolvePath(ctx, p) {
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if (ctx && ctx.vfs && typeof ctx.vfs.resolveLogical === 'function') {
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try {
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return String(ctx.vfs.resolveLogical(p) || p)
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} catch {
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/* fall through */
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}
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}
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return String(p || '')
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}
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/**
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* True when dest is src or lives under src (self-copy / self-move).
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* @param {Record<string, unknown>} ctx
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* @param {string} src
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* @param {string} dest
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*/
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function bareOsDestInsideSrc(ctx, src, dest) {
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const s = bareOsNormPath(bareOsResolvePath(ctx, src))
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const d = bareOsNormPath(bareOsResolvePath(ctx, dest))
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if (s === d) return true
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if (s === '/') return d !== '/'
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return d === s || d.startsWith(s + '/')
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}
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const BARE_OS_B64_ALPH =
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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/** @param {Uint8Array} u8 */
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function bareOsB64Encode(u8) {
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let out = ''
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let i = 0
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for (; i + 2 < u8.length; i += 3) {
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const n = (u8[i] << 16) | (u8[i + 1] << 8) | u8[i + 2]
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out +=
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BARE_OS_B64_ALPH[(n >> 18) & 63] +
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BARE_OS_B64_ALPH[(n >> 12) & 63] +
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BARE_OS_B64_ALPH[(n >> 6) & 63] +
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BARE_OS_B64_ALPH[n & 63]
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}
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const rest = u8.length - i
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if (rest === 1) {
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const n = u8[i] << 16
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out += BARE_OS_B64_ALPH[(n >> 18) & 63] + BARE_OS_B64_ALPH[(n >> 12) & 63] + '=='
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} else if (rest === 2) {
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const n = (u8[i] << 16) | (u8[i + 1] << 8)
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out +=
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BARE_OS_B64_ALPH[(n >> 18) & 63] +
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BARE_OS_B64_ALPH[(n >> 12) & 63] +
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BARE_OS_B64_ALPH[(n >> 6) & 63] +
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'='
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}
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return out
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}
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/**
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* RFC 4648 Base64 decode (also accepts URL-safe alphabet). Rejects junk.
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* @param {string} s
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* @returns {Uint8Array}
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*/
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function bareOsB64Decode(s) {
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const t = String(s).replace(/\s+/g, '')
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if (!t) return new Uint8Array(0)
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if (t.length % 4 === 1) throw new Error('invalid base64 length')
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let pad = 0
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if (t.endsWith('==')) pad = 2
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else if (t.endsWith('=')) pad = 1
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const body = pad ? t.slice(0, t.length - pad) : t
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const bytes = []
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let buf = 0
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let bits = 0
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for (let i = 0; i < body.length; i++) {
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const c = body[i]
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let v = BARE_OS_B64_ALPH.indexOf(c)
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if (v < 0) {
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if (c === '-') v = 62
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else if (c === '_') v = 63
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else throw new Error('invalid base64 character')
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}
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buf = (buf << 6) | v
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bits += 6
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if (bits >= 8) {
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bits -= 8
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bytes.push((buf >> bits) & 255)
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}
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}
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if (pad) {
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const want = Math.floor((body.length * 6) / 8)
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if (bytes.length > want) bytes.length = want
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}
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return new Uint8Array(bytes)
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}
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/**
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* @param {string} s
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* @returns {Uint8Array}
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*/
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function bareOsHexDecode(s) {
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const t = String(s).replace(/\s+/g, '')
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if (t.length % 2 !== 0) throw new Error('odd hex length')
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const out = new Uint8Array(t.length / 2)
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for (let i = 0; i < out.length; i++) {
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const pair = t.slice(i * 2, i * 2 + 2)
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if (!/^[0-9a-fA-F]{2}$/.test(pair)) throw new Error('invalid hex')
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out[i] = Number.parseInt(pair, 16)
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}
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return out
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}
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/** @param {Uint8Array} u8 */
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function bareOsHexEncode(u8) {
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let s = ''
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for (let i = 0; i < u8.length; i++) s += u8[i].toString(16).padStart(2, '0')
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return s
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}
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/**
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* @param {string} raw
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* @param {number} curLen
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* @returns {number | null}
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*/
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function resolveTruncateSize(raw, curLen) {
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const s = String(raw).trim()
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if (!s) return null
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if (/%$/.test(s)) {
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const inner = s.startsWith('+') || s.startsWith('-') ? s.slice(1) : s
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const pct = Number.parseFloat(inner.replace(/%$/, ''))
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if (!Number.isFinite(pct)) return null
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const delta = Math.floor((curLen * pct) / 100)
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if (s.startsWith('+')) return Math.max(0, curLen + delta)
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if (s.startsWith('-')) return Math.max(0, curLen - delta)
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return Math.max(0, Math.floor((curLen * pct) / 100))
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}
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if (s.startsWith('+')) {
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const n = Number.parseInt(s.slice(1), 10)
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if (!Number.isFinite(n)) return null
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return Math.max(0, curLen + n)
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}
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if (s.startsWith('-')) {
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const n = Number.parseInt(s.slice(1), 10)
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if (!Number.isFinite(n)) return null
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return Math.max(0, curLen - n)
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}
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const abs = Number.parseInt(s, 10)
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if (!Number.isFinite(abs) || abs < 0) return null
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return abs
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}
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async function run(ctx, argv) {
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/** @type {string | null} */
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let sizeSpec = null
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const paths = []
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for (let i = 1; i < argv.length; i++) {
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const a = argv[i]
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if (a === '-h' || a === '--help') {
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ctx.console.log(
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'usage: truncate -s SIZE FILE\n' +
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'SIZE: bytes, +N, -N, +N%, -N%, or N% (of current length).\n' +
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'Sets file length (padded with zeros if growing).'
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)
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return
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}
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if ((a === '-s' || a === '--size') && argv[i + 1]) {
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sizeSpec = argv[++i]
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continue
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}
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if (a.startsWith('-')) {
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ctx.console.error('truncate: unsupported option ' + a)
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ctx.exitCode = 1
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return
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}
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paths.push(a)
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}
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if (!sizeSpec || paths.length !== 1) {
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ctx.console.error('usage: truncate -s SIZE FILE')
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ctx.exitCode = 1
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return
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}
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const file = paths[0]
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let cur = new Uint8Array(0)
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let existed = false
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try {
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const st = await ctx.vfs.lstat(file)
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if (st) {
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existed = true
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if (st.type === 'directory') {
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ctx.console.error('truncate: ' + file + ': Is a directory')
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ctx.exitCode = 1
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return
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}
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}
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const b = await ctx.vfs.readFile(file)
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if (b) cur = b instanceof Uint8Array ? b : new Uint8Array(b)
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else if (existed) {
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ctx.console.error('truncate: ' + file + ': cannot read')
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ctx.exitCode = 1
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return
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}
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} catch (e) {
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if (!bareOsIsNotFoundErr(e)) {
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ctx.console.error('truncate: ' + file + ': ' + ((e && e.message) || e))
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ctx.exitCode = 1
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return
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}
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}
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const size = resolveTruncateSize(sizeSpec, cur.length)
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if (size == null) {
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ctx.console.error('truncate: invalid size: ' + sizeSpec)
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ctx.exitCode = 1
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return
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}
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const cap = bareOsEnvInt(ctx, 'BARE_OS_TRUNCATE_MAX_BYTES', 32 * 1024 * 1024, 0, 256 * 1024 * 1024)
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if (size > cap) {
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ctx.console.error(
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'truncate: size ' + size + ' exceeds cap ' + cap + ' (BARE_OS_TRUNCATE_MAX_BYTES)'
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)
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ctx.exitCode = 1
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return
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}
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const out = new Uint8Array(size)
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out.set(cur.subarray(0, Math.min(cur.length, size)))
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try {
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await ctx.vfs.writeFile(file, out)
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} catch (e) {
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ctx.console.error('truncate: ' + (e.message || e))
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ctx.exitCode = 1
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}
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}
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