avoid error when saving without git dependencies

src/common.ts

@@ -1,6 +1,7 @@
 import * as core from "@actions/core";
 import * as exec from "@actions/exec";
 import * as glob from "@actions/glob";
+import * as io from "@actions/io";
 import crypto from "crypto";
 import fs from "fs";
 import os from "os";
@@ -109,3 +110,93 @@ async function getLockfileHash(): Promise<string> {
   }
   return hasher.digest("hex").slice(0, 20);
 }
+
+export interface PackageDefinition {
+  name: string;
+  version: string;
+  path: string;
+  targets: Array<string>;
+}
+
+export type Packages = Array<PackageDefinition>;
+
+interface Meta {
+  packages: Array<{
+    name: string;
+    version: string;
+    manifest_path: string;
+    targets: Array<{ kind: Array<string>; name: string }>;
+  }>;
+}
+
+export async function getPackages(): Promise<Packages> {
+  const cwd = process.cwd();
+  const meta: Meta = JSON.parse(await getCmdOutput("cargo", ["metadata", "--all-features", "--format-version", "1"]));
+
+  return meta.packages
+    .filter((p) => !p.manifest_path.startsWith(cwd))
+    .map((p) => {
+      const targets = p.targets.filter((t) => t.kind[0] === "lib").map((t) => t.name);
+      return { name: p.name, version: p.version, targets, path: path.dirname(p.manifest_path) };
+    });
+}
+
+export async function cleanTarget(packages: Packages) {
+  await fs.promises.unlink("./target/.rustc_info.json");
+  await io.rmRF("./target/debug/examples");
+  await io.rmRF("./target/debug/incremental");
+
+  let dir: fs.Dir;
+  // remove all *files* from debug
+  dir = await fs.promises.opendir("./target/debug");
+  for await (const dirent of dir) {
+    if (dirent.isFile()) {
+      await rm(dir.path, dirent);
+    }
+  }
+
+  const keepPkg = new Set(packages.map((p) => p.name));
+  await rmExcept("./target/debug/build", keepPkg);
+  await rmExcept("./target/debug/.fingerprint", keepPkg);
+
+  const keepDeps = new Set(
+    packages.flatMap((p) => {
+      const names = [];
+      for (const n of [p.name, ...p.targets]) {
+        const name = n.replace(/-/g, "_");
+        names.push(name, `lib${name}`);
+      }
+      return names;
+    }),
+  );
+  await rmExcept("./target/debug/deps", keepDeps);
+}
+
+const oneWeek = 7 * 24 * 3600 * 1000;
+
+export async function rmExcept(dirName: string, keepPrefix: Set<string>) {
+  const dir = await fs.promises.opendir(dirName);
+  for await (const dirent of dir) {
+    let name = dirent.name;
+    const idx = name.lastIndexOf("-");
+    if (idx !== -1) {
+      name = name.slice(0, idx);
+    }
+    const fileName = path.join(dir.path, dirent.name);
+    const { mtime } = await fs.promises.stat(fileName);
+    // we don’t really know
+    if (!keepPrefix.has(name) || Date.now() - mtime.getTime() > oneWeek) {
+      await rm(dir.path, dirent);
+    }
+  }
+}
+
+export async function rm(parent: string, dirent: fs.Dirent) {
+  const fileName = path.join(parent, dirent.name);
+  core.debug(`deleting "${fileName}"`);
+  if (dirent.isFile()) {
+    await fs.promises.unlink(fileName);
+  } else if (dirent.isDirectory()) {
+    await io.rmRF(fileName);
+  }
+}