473 lines
13 KiB
Plaintext
473 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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async function run(ctx, argv) {
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if (argv.length < 2) {
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ctx.console.error('usage: sh [-eu] [-s | -c COMMAND | SCRIPT]')
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ctx.exitCode = 2
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return
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}
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if (typeof ctx.execLine !== 'function') {
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ctx.console.error('sh: execLine is not available (requires a Bare OS booter session)')
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ctx.exitCode = 1
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return
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}
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const vfsEnv =
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ctx.vfs?.env && typeof ctx.vfs.env === 'object' ? ctx.vfs.env : null
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let i = 1
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let sawFlags = false
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while (i < argv.length) {
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const a = argv[i]
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if (a === '--') {
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i++
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break
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}
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if (a === '-' || !a.startsWith('-')) break
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if (a === '-c' || a === '-s') break
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sawFlags = true
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for (const ch of a.slice(1)) {
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if (ch === 'e' && vfsEnv) vfsEnv.BARE_OS_SHELL_ERREXIT = '1'
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else if (ch === 'u' && vfsEnv) vfsEnv.BARE_OS_SHELL_NOUNSET = '1'
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else if (ch === 'v' && vfsEnv) vfsEnv.BARE_OS_SHELL_XTRACE = '1'
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else if (ch === 'x' && vfsEnv) vfsEnv.BARE_OS_SHELL_XTRACE = '1'
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else if (ch === 'C' && vfsEnv) vfsEnv.BARE_OS_SHELL_NOCLOBBER = '1'
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}
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i++
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}
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const mode = argv[i]
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if (mode == null && !sawFlags) {
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ctx.console.error('usage: sh [-eu] [-s | -c COMMAND | SCRIPT]')
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ctx.exitCode = 2
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return
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}
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if (mode === '-c') {
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const command = argv[i + 1]
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if (command == null) {
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ctx.console.error('sh: option requires an argument -- c')
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ctx.console.error('usage: sh -c COMMAND [NAME [ARG ...]] | sh SCRIPT')
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ctx.exitCode = 2
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return
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}
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const env = ctx.vfs?.env
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/** @type {Record<string, string | undefined> | null} */
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const saved = env && typeof env === 'object' ? {} : null
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if (saved && env) {
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for (const k of ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '#']) {
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saved[k] = env[k]
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}
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env['0'] = argv[i + 3] ?? 'sh'
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const args = argv.slice(i + 4)
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for (let j = 1; j <= 9; j++) env[String(j)] = args[j - 1] ?? ''
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env['#'] = String(args.length)
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}
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try {
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await ctx.execLine(command)
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const v = ctx.vfs?.env?.BARE_OS_EXIT_STATUS
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const n = Number.parseInt(String(v ?? ''), 10)
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if (Number.isFinite(n)) ctx.exitCode = n
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} finally {
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if (saved && env) {
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for (const [k, v] of Object.entries(saved)) {
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if (v == null) delete env[k]
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else env[k] = v
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}
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}
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}
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return
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}
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if (mode === '-s') {
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const stdinText =
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typeof ctx.shellStdin === 'string'
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? ctx.shellStdin
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: typeof ctx.shellStdin === 'object' &&
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ctx.shellStdin &&
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'data' in ctx.shellStdin
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? String(/** @type {{ data?: string }} */ (ctx.shellStdin).data ?? '')
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: ''
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await runShScriptText(ctx, stdinText, { label: 'stdin' })
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return
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}
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const script = mode
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let buf
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try {
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buf = await ctx.vfs.readFile(script)
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} catch (e) {
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ctx.console.error('sh: ' + ((e && e.message) || String(e)))
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ctx.exitCode = 1
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return
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}
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if (buf == null) {
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ctx.console.error('sh: ' + script + ': not found')
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ctx.exitCode = 127
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return
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}
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let text = ctx.b4a.toString(buf)
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if (text.charCodeAt(0) === 0xfeff) text = text.slice(1)
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text = text.replace(/^\ufeff/, '')
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if (text.startsWith('#!')) {
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const nl = text.indexOf('\n')
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text = nl === -1 ? '' : text.slice(nl + 1)
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}
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await runShScriptText(ctx, text, { label: script })
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}
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/**
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* @param {Record<string, unknown>} ctx
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* @param {string} text
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* @param {{ label: string }} meta
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*/
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async function runShScriptText(ctx, text, meta) {
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text = String(text || '').replace(/\\\r?\n/g, '')
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const lines = text.split(/\r?\n/)
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const blocks = []
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let cur = ''
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let depth = 0
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for (let i = 0; i < lines.length; i++) {
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const raw = lines[i]
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const trimmed = raw.trim()
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if (!trimmed || trimmed.startsWith('#')) continue
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cur += (cur ? '\n' : '') + raw
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const words = trimmed
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.replace(/[;(){}]/g, ' ')
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.split(/\s+/)
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.filter(Boolean)
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for (const w of words) {
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if (w === 'if' || w === 'for' || w === 'while' || w === 'until' || w === 'case')
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depth++
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else if (w === 'fi' || w === 'done' || w === 'esac') depth = Math.max(0, depth - 1)
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}
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if (depth === 0) {
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blocks.push(cur)
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cur = ''
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}
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}
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if (cur.trim()) blocks.push(cur)
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let lineNo = 1
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for (const block of blocks) {
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const env = ctx.vfs?.env
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if (env && typeof env === 'object') {
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env.BARE_OS_SH_SCRIPT_LABEL = meta.label
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env.BARE_OS_SH_SCRIPT_LINE = String(lineNo)
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}
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await ctx.execLine(block)
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lineNo += block.split(/\r?\n/).length
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if ((Number(ctx.exitCode) || 0) !== 0) return
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}
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ctx.exitCode = 0
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}
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