fix: backport scripts/link-cli.js

Fixes #661

We avoid Promises to allow this script to run under older
system versions of node.

package.json

@@ -56,7 +56,7 @@
     "check-dependencies": "node ./scripts/check-mismatched-dependencies.js",
     "prettier": "yarn workspaces run prettier",
     "lerna": "lerna",
-    "link-cli": "node ./scripts/link-cli.js",
+    "link-cli": "node ./scripts/link-cli.cjs",
     "lint-fix": "yarn workspaces run lint-fix",
     "lint-check": "yarn workspaces run lint-check",
     "test": "yarn workspaces run test",

scripts/link-cli.cjs

@@ -0,0 +1,23 @@
+#! /usr/bin/env node
+
+const fs = require('fs');
+const path = require('path');
+
+try {
+  const script = process.argv[2] || '/usr/local/bin/agoric';
+  const cli = path.resolve(__dirname, '../packages/agoric-cli/bin/agoric');
+  const content = `\
+#! /bin/sh
+# AUTOMATICALLY GENERATED by ${process.argv[1]}
+# Always execute the checked-out Agoric CLI with the --sdk flag.
+exec ${cli} --sdk \${1+"\$@"}
+`;
+  console.log(`creating ${script}`);
+  fs.writeFileSync(script, content);
+  fs.chmodSync(script, '0755');
+} catch (e) {
+  console.error(err);
+  process.exit(1);
+}
+
+process.exit(0);