469 lines
13 KiB
Plaintext
469 lines
13 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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/** @param {string | number} s */
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function parseBareOsTestInt(s) {
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const t = String(s).trim()
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if (t === '' || t === '+' || t === '-') return NaN
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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 {Record<string, unknown>} ctx */
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function testParseEuidEgid(ctx) {
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const e = (ctx.vfs && ctx.vfs.env) || ctx.env || {}
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const uid = Number.parseInt(String(e.UID != null ? e.UID : '1000'), 10)
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const gid = Number.parseInt(String(e.GID != null ? e.GID : '1000'), 10)
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return {
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euid: Number.isFinite(uid) ? uid : 1000,
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egid: Number.isFinite(gid) ? gid : 1000
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}
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}
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/**
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* User/group/other permission triplet (0–7) for the effective uid/gid.
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* @param {Record<string, unknown>} st
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* @param {number} euid
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* @param {number} egid
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*/
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function testEffPermTriplet(st, euid, egid) {
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const mode =
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typeof st.mode === 'number'
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? st.mode & 0o777
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: Number.parseInt(String(st.mode || '644'), 8) & 0o777
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const fuid = st.uid != null ? Number(st.uid) : 0
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const fgid = st.gid != null ? Number(st.gid) : 0
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if (euid === fuid) return (mode >> 6) & 7
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if (egid === fgid) return (mode >> 3) & 7
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return mode & 7
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}
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async function evalTest(ctx, args) {
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if (!args.length) return false
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if (args[0] === '!') {
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const inner = await evalTest(ctx, args.slice(1))
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return !inner
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}
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if (args.length === 3) {
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const [a, op, b] = args
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if (op === '-eq' || op === '-ne' || op === '-lt' || op === '-le' || op === '-gt' || op === '-ge') {
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const la = parseBareOsTestInt(a)
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const lb = parseBareOsTestInt(b)
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if (!Number.isFinite(la) || !Number.isFinite(lb)) {
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if (String(a).trim() === '' || String(b).trim() === '') {
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throw new Error('test: integer expression expected')
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}
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return false
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}
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switch (op) {
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case '-eq':
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return la === lb
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case '-ne':
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return la !== lb
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case '-lt':
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return la < lb
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case '-le':
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return la <= lb
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case '-gt':
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return la > lb
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case '-ge':
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return la >= lb
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default:
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return false
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}
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}
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if (op === '=') return a === b
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if (op === '!=') return a !== b
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if (op === '-nt' || op === '-ot' || op === '-ef') {
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const s1 = await ctx.vfs.stat(a)
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const s2 = await ctx.vfs.stat(b)
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if (!s1 || !s2) return false
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if (op === '-ef') {
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const i1 = s1.ino != null ? String(s1.ino) : ''
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const i2 = s2.ino != null ? String(s2.ino) : ''
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const d1 = s1.dev != null ? String(s1.dev) : ''
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const d2 = s2.dev != null ? String(s2.dev) : ''
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if (i1 && i2 && d1 && d2) return i1 === i2 && d1 === d2
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return a === b
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}
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const t1 = Number(s1.mtimeMs)
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const t2 = Number(s2.mtimeMs)
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const m1 = Number.isFinite(t1) ? t1 : 0
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const m2 = Number.isFinite(t2) ? t2 : 0
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if (op === '-nt') return m1 > m2
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if (op === '-ot') return m1 < m2
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}
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return false
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}
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if (args.length === 2) {
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const op = args[0]
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const p = args[1]
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if (op === '-h' || op === '-L') {
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const st = await ctx.vfs.lstat(p)
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return st != null && st.type === 'symlink'
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}
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const { euid, egid } = testParseEuidEgid(ctx)
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const st = await ctx.vfs.stat(p)
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if (op === '-e' || op === '-a') return st != null
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if (op === '-f') return st != null && st.type === 'file'
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if (op === '-d') return st != null && st.type === 'directory'
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if (op === '-r')
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return st != null && (testEffPermTriplet(st, euid, egid) & 4) !== 0
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if (op === '-w')
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return st != null && (testEffPermTriplet(st, euid, egid) & 2) !== 0
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if (op === '-x')
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return st != null && (testEffPermTriplet(st, euid, egid) & 1) !== 0
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if (st != null) {
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const m =
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typeof st.mode === 'number'
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? st.mode
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: Number.parseInt(String(st.mode || '0'), 8) || 0
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if (op === '-u') return (m & 0o4000) !== 0
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if (op === '-g') return (m & 0o2000) !== 0
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if (op === '-k') return (m & 0o1000) !== 0
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}
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if (op === '-s')
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return st != null && st.type === 'file' && Number(st.size) > 0
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if (op === '-z') return p.length === 0
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if (op === '-n') return p.length > 0
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return false
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}
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if (args.length === 1) return args[0] !== ''
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return false
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}
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async function run(ctx, argv) {
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const prog0 = argv[0] != null ? String(argv[0]) : ''
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let testArgs = argv.slice(1)
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if (prog0 === '[' || prog0.endsWith('/[')) {
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if (!testArgs.length) {
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ctx.console.error('[: missing ]')
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ctx.exitCode = 2
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return
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}
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if (testArgs[testArgs.length - 1] !== ']') {
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ctx.console.error('[: expected ]')
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ctx.exitCode = 2
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return
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}
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testArgs = testArgs.slice(0, -1)
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}
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try {
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ctx.exitCode = (await evalTest(ctx, testArgs)) ? 0 : 1
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} catch (e) {
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ctx.console.error((e && e.message) || String(e))
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ctx.exitCode = 2
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}
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}
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