test verifying #398 is fixed

tap-snapshots/test/unpack.js.test.cjs

@@ -0,0 +1,18 @@
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+exports[`test/unpack.js > TAP > ignore self-referential hardlinks > async > must match snapshot 1`] = `
+Array [
+  "ENOENT: no such file or directory, link '{CWD}/.tap/fixtures/test-unpack.js-ignore-self-referential-hardlinks-async/autolink' -> '{CWD}/.tap/fixtures/test-unpack.js-ignore-self-referential-hardlinks-async/autolink'",
+]
+`
+
+exports[`test/unpack.js > TAP > ignore self-referential hardlinks > sync > must match snapshot 1`] = `
+Array [
+  "ENOENT: no such file or directory, link '{CWD}/.tap/fixtures/test-unpack.js-ignore-self-referential-hardlinks-sync/autolink' -> '{CWD}/.tap/fixtures/test-unpack.js-ignore-self-referential-hardlinks-sync/autolink'",
+]
+`

test/unpack.js

@@ -1,6 +1,6 @@
 import { Unpack, UnpackSync } from '../dist/esm/unpack.js'
 
-import fs from 'fs'
+import fs, { readdirSync } from 'fs'
 import { Minipass } from 'minipass'
 import * as z from 'minizlib'
 import path from 'path'
@@ -3531,3 +3531,35 @@ t.test('excessively deep subfolder nesting', async t => {
     check(t, 64)
   })
 })
+
+t.test('ignore self-referential hardlinks', async t => {
+  const data = makeTar([
+    {
+      path: 'autolink',
+      linkpath: './autolink',
+      type: 'Link',
+    },
+  ])
+  const check = (t, warnings) => {
+    t.matchSnapshot(warnings)
+    t.strictSame(readdirSync(t.testdirName), [], 'nothing extracted')
+    t.end()
+  }
+  t.test('async', t => {
+    const cwd = t.testdir({})
+    const warnings = []
+    const u = new Unpack({ cwd, onwarn: (_, m) => warnings.push(m) })
+    u.on('end', () => check(t, warnings))
+    u.end(data)
+  })
+  t.test('sync', t => {
+    const cwd = t.testdir({})
+    const warnings = []
+    const u = new UnpackSync({
+      cwd,
+      onwarn: (_, m) => warnings.push(m),
+    })
+    u.end(data)
+    check(t, warnings)
+  })
+})