test(hopper): verify alternate Linux launcher path

.github/workflows/real-hopper-linux.yml

@@ -57,7 +57,7 @@ jobs:
           npm install --global --prefix "${prefix}" "./${tarball}"
           echo "REA_VERIFY_SERVER_COMMAND=${prefix}/bin/rea" >> "${GITHUB_ENV}"
           echo 'REA_VERIFY_SERVER_ARGS_JSON=["mcp"]' >> "${GITHUB_ENV}"
-      - name: Verify two binaries through the in-process bridge
+      - name: Verify two binaries through an alternate launcher symlink
         env:
           HOPPER_TARGET_PATH: ${{ inputs.first_target }}
           HOPPER_SECOND_TARGET_PATH: ${{ inputs.second_target }}

scripts/verify-real-hopper-linux.mjs

@@ -1,5 +1,7 @@
-import { access } from "node:fs/promises";
+import { access, mkdtemp, rm, symlink } from "node:fs/promises";
 import { execFile } from "node:child_process";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import { promisify } from "node:util";
 
 const execFileAsync = promisify(execFile);
@@ -14,5 +16,14 @@ await access("/usr/bin/python3");
 const linked = await execFileAsync("ldd", [launcher]);
 if (`${linked.stdout}\n${linked.stderr}`.includes("not found"))
   throw new Error("Hopper has unresolved shared-library dependencies");
-process.env.HOPPER_LAUNCHER_PATH = launcher;
-await import("./verify-real-hopper.mjs");
+const alternateDirectory = await mkdtemp(
+  join(tmpdir(), "rea-real-hopper-launcher-"),
+);
+const alternateLauncher = join(alternateDirectory, "Hopper-alternate");
+try {
+  await symlink(launcher, alternateLauncher);
+  process.env.HOPPER_LAUNCHER_PATH = alternateLauncher;
+  await import("./verify-real-hopper.mjs");
+} finally {
+  await rm(alternateDirectory, { recursive: true, force: true });
+}