Updates

packages/bare-os-coreutils/src/getconf.js

@@ -1,10 +1,65 @@
+/**
+ * Subset of POSIX.1-2017 getconf — fixed values for Bare OS (no host sysconf).
+ * Unknown names exit with status 1 (matches common getconf for invalid var).
+ */
+
+const CONF = {
+  PATH_MAX: '4096',
+  NAME_MAX: '255',
+  /** POSIX minimum for ARG_MAX; Bare uses a conservative cap for runBinCommand argv. */
+  _POSIX_ARG_MAX: '4096',
+  ARG_MAX: '262144',
+  LINE_MAX: '2048',
+  /** POSIX.1-2008 */
+  _POSIX_VERSION: '200809',
+  _POSIX2_VERSION: '200809',
+  NGROUPS_MAX: '32',
+  OPEN_MAX: '256',
+  STREAM_MAX: '256',
+  TZNAME_MAX: '32',
+  _POSIX_CHOWN_RESTRICTED: '1',
+  _POSIX_NO_TRUNC: '1',
+  _POSIX_VDISABLE: '0',
+  _POSIX_JOB_CONTROL: '0',
+  _POSIX_SAVED_IDS: '0',
+  /** Bare shell line length (reasonable REPL limit, not a hard kernel cap). */
+  BARE_OS_INPUT_LINE_MAX: '8192'
+}
+
 async function run(ctx, argv) {
-  const name = argv[1]
+  const args = argv.slice(1).filter((a) => a !== '--')
+  let dumpAll = false
+  let name = null
+  for (const a of args) {
+    if (a === '-a') dumpAll = true
+    else if (!a.startsWith('-')) name = a
+    else {
+      ctx.console.error('getconf: unknown option: ' + a)
+      ctx.exitCode = 1
+      return
+    }
+  }
+
+  if (dumpAll) {
+    for (const k of Object.keys(CONF).sort()) {
+      ctx.console.log(k + '\n' + CONF[k])
+    }
+    ctx.exitCode = 0
+    return
+  }
+
   if (!name) {
-    ctx.console.error('usage: getconf VARIABLE_NAME')
+    ctx.console.error('usage: getconf [-a] system_var')
     ctx.exitCode = 1
     return
   }
-  ctx.console.error('getconf: not implemented on Bare OS (no full sysconf path): ' + name)
+
+  if (Object.prototype.hasOwnProperty.call(CONF, name)) {
+    ctx.console.log(CONF[name])
+    ctx.exitCode = 0
+    return
+  }
+
+  ctx.console.error('getconf: ' + name + ': unknown variable')
   ctx.exitCode = 1
 }

packages/bare-os-coreutils/src/xargs.js

@@ -1,6 +1,118 @@
+/**
+ * Bounded xargs for Bare OS: invokes ctx.runBinCommand only (no host spawn).
+ * Limits: stdin 256KiB, 4096 whitespace/null tokens, 128 args per invocation,
+ * 64 invocations per run. Exceeding limits is a fatal error (exit 125).
+ */
+
+const MAX_STDIN = 256 * 1024
+const MAX_TOKENS = 4096
+const MAX_PER_INVOCATION = 128
+const MAX_INVOCATIONS = 64
+
 async function run(ctx, argv) {
-  ctx.console.error(
-    'xargs: running arbitrary commands from /bin/xargs is not supported in Bare OS; use the shell to expand arguments.'
-  )
-  ctx.exitCode = 1
+  if (typeof ctx.runBinCommand !== 'function') {
+    ctx.console.error(
+      'xargs: ctx.runBinCommand is not available (requires a Bare OS booter session)'
+    )
+    ctx.exitCode = 1
+    return
+  }
+  const args = argv.slice(1)
+  let nullSep = false
+  let maxBatch = MAX_PER_INVOCATION
+  let i = 0
+
+  while (i < args.length && args[i].startsWith('-')) {
+    const a = args[i]
+    if (a === '--') {
+      i++
+      break
+    }
+    if (a === '-0' || a === '--null') {
+      nullSep = true
+      i++
+      continue
+    }
+    if (a === '-n' || a === '--max-args') {
+      const n = args[i + 1]
+      if (n == null || !/^\d+$/.test(n) || Number(n) < 1) {
+        ctx.console.error('xargs: -n requires a positive integer')
+        ctx.exitCode = 1
+        return
+      }
+      maxBatch = Math.min(Number(n), MAX_PER_INVOCATION)
+      i += 2
+      continue
+    }
+    if (a.startsWith('-n') && a.length > 2 && /^\d+$/.test(a.slice(2))) {
+      const n = Number(a.slice(2))
+      maxBatch = Math.min(n, MAX_PER_INVOCATION)
+      i++
+      continue
+    }
+    ctx.console.error('xargs: unsupported option: ' + a)
+    ctx.console.error(
+      'xargs: Bare OS supports: -0/--null, -n N (max ' +
+        MAX_PER_INVOCATION +
+        ' per run)'
+    )
+    ctx.exitCode = 1
+    return
+  }
+
+  /** @type {string[]} */
+  let cmd = args.slice(i)
+  if (cmd.length === 0) cmd = ['echo']
+
+  let text = bareStdin(ctx) || ''
+  if (text.length > MAX_STDIN) {
+    ctx.console.error(
+      'xargs: stdin exceeds ' + MAX_STDIN + ' bytes (Bare OS limit)'
+    )
+    ctx.exitCode = 125
+    return
+  }
+
+  /** @type {string[]} */
+  let pieces
+  if (nullSep) {
+    pieces = text.split('\0').filter((s) => s.length > 0)
+  } else {
+    pieces = text.trim() === '' ? [] : text.trim().split(/\s+/).filter(Boolean)
+  }
+
+  if (pieces.length > MAX_TOKENS) {
+    ctx.console.error(
+      'xargs: too many arguments (' + pieces.length + ' > ' + MAX_TOKENS + ')'
+    )
+    ctx.exitCode = 125
+    return
+  }
+
+  const runOne = async (batch) => {
+    await ctx.runBinCommand(cmd.concat(batch))
+  }
+
+  if (pieces.length === 0) {
+    await runOne([])
+    return
+  }
+
+  let invocations = 0
+  for (let o = 0; o < pieces.length; o += maxBatch) {
+    if (++invocations > MAX_INVOCATIONS) {
+      ctx.console.error(
+        'xargs: exceeded ' + MAX_INVOCATIONS + ' invocations (Bare OS limit)'
+      )
+      ctx.exitCode = 125
+      return
+    }
+    const batch = pieces.slice(o, o + maxBatch)
+    await runOne(batch)
+    const ec = Number(ctx.exitCode) || 0
+    if (ec !== 0) {
+      ctx.exitCode = ec
+      return
+    }
+  }
 }