Clean cargo.

package.json

@@ -19,6 +19,7 @@
     "@actions/cache": "^3.2.1",
     "@actions/core": "^1.10.0",
     "@actions/exec": "^1.1.1",
+    "@actions/glob": "^0.4.0",
     "@actions/tool-cache": "^2.0.1",
     "@ltd/j-toml": "^1.38.0"
   },

pnpm-lock.yaml

@@ -10,6 +10,9 @@ dependencies:
   '@actions/exec':
     specifier: ^1.1.1
     version: 1.1.1
+  '@actions/glob':
+    specifier: ^0.4.0
+    version: 0.4.0
   '@actions/tool-cache':
     specifier: ^2.0.1
     version: 2.0.1
@@ -82,6 +85,13 @@ packages:
       minimatch: 3.1.2
     dev: false
 
+  /@actions/glob@0.4.0:
+    resolution: {integrity: sha512-+eKIGFhsFa4EBwaf/GMyzCdWrXWymGXfFmZU3FHQvYS8mPcHtTtZONbkcqqUMzw9mJ/pImEBFET1JNifhqGsAQ==}
+    dependencies:
+      '@actions/core': 1.10.0
+      minimatch: 3.1.2
+    dev: false
+
   /@actions/http-client@2.1.0:
     resolution: {integrity: sha512-BonhODnXr3amchh4qkmjPMUO8mFi/zLaaCeCAJZqch8iQqyDnVIkySjB38VHAC8IJ+bnlgfOqlhpyCUZHlQsqw==}
     dependencies:

src/cargo.ts

@@ -1,8 +1,12 @@
+/* eslint-disable node/no-unsupported-features/node-builtins */
+
+import fs from 'fs';
 import os from 'os';
 import path from 'path';
 import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
+import * as glob from '@actions/glob';
 
 // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
 export const CARGO_HOME = process.env.CARGO_HOME || path.join(os.homedir(), '.cargo');
@@ -17,6 +21,25 @@ export function getPathsToCache(): string[] {
 	return [path.join(CARGO_HOME, 'registry')];
 }
 
+export async function cleanCargoRegistry() {
+	core.info('Cleaning cache before saving');
+
+	const registryDir = path.join(CARGO_HOME, 'registry');
+
+	// .cargo/registry/src - Delete entirely
+	await exec.exec('cargo', ['cache', '--autoclean']);
+
+	// .cargo/registry/index - Delete .cache directories
+	const globber = await glob.create(path.join(registryDir, 'index/**/.cache'));
+
+	for await (const file of globber.globGenerator()) {
+		core.debug(`Deleting ${file}`);
+		await fs.promises.unlink(file);
+	}
+
+	// .cargo/registry/cache - Do nothing?
+}
+
 export async function saveCache() {
 	if (!CACHE_ENABLED) {
 		return;
@@ -30,9 +53,7 @@ export async function saveCache() {
 		return;
 	}
 
-	core.info('Cleaning cache before saving');
+	await cleanCargoRegistry();
-
-	await exec.exec('cargo', ['cache', '--autoclean']);
 
 	core.info(`Saving cache with key ${primaryKey}`);