embedding cache steps by using @actions/cache

README.md

@@ -24,12 +24,6 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - uses: actions/setup-python@v1
-    - name: set PY
-      run: echo "::set-env name=PY::$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
-    - uses: actions/cache@v1
-      with:
-        path: ~/.cache/pre-commit
-        key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
     - uses: pre-commit/action@v1.1.1
 ```
 

index.js

@@ -1,7 +1,58 @@
+const os = require('os');
+const fs = require('fs');
+const path = require('path');
+const crypto = require('crypto');
+
 const core = require('@actions/core');
 const exec = require('@actions/exec');
 const github = require('@actions/github');
 const tr = require('@actions/exec/lib/toolrunner');
+const cache = require('@actions/cache');
+
+const paths = [path.join(os.homedir(), '.cache', 'pre-commit')];
+
+async function getPythonVersion() {
+    let myOutput = '';
+    const options = {
+        silent: true,
+        listeners: {
+            stdout: (data) => {
+                myOutput += data.toString();
+            }
+        }
+    };
+
+    await exec.exec('python', ['-VV'], options);
+    await exec.exec('which', ['python'], options);
+    return myOutput;
+}
+
+function hashFile(filePath) {
+    return hashString(fs.readFileSync(filePath).toString());
+
+}
+
+function hashString(content) {
+    const sha256 = crypto.createHash('sha256');
+    return sha256.update(content).digest('hex');
+}
+
+async function setupCache(cacheKey) {
+    try {
+        await cache.saveCache(paths, cacheKey);
+    } catch (e) {
+        if (e.toString().includes('reserveCache failed')) {
+            // race condition
+            core.info(e.message);
+            return;
+        }
+        throw e;
+    }
+}
+
+async function restoreCache(cacheKey) {
+    return !!(await cache.restoreCache(paths, cacheKey));
+}
 
 function addToken(url, token) {
     return url.replace(/^https:\/\//, `https://x-access-token:${token}@`);
@@ -22,7 +73,13 @@ async function main() {
     const token = core.getInput('token');
     const pr = github.context.payload.pull_request;
     const push = !!token && !!pr;
+
+    const pyVer = await getPythonVersion();
+    const cacheKey = `pre-commit-1-${hashString(pyVer)}-${hashFile('.pre-commit-config.yaml')}`;
+    await restoreCache(cacheKey);
     const ret = await exec.exec('pre-commit', args, {ignoreReturnCode: push});
+    await setupCache(cacheKey);
+
     if (ret && push) {
         // actions do not run on pushes made by actions.
         // need to make absolute sure things are good before pushing

package-lock.json

@@ -2,6 +2,27 @@
   "requires": true,
   "lockfileVersion": 1,
   "dependencies": {
+    "@actions/cache": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-0.2.1.tgz",
+      "integrity": "sha512-CV2D9zp+d+nL7o6XK/I7vVh350JglPMp/jHi9ppRUkdBHPUeP0UHVUfygZaAs8WmxhhWY1MI0gWah+t0QYu3Fg==",
+      "requires": {
+        "@actions/core": "^1.2.4",
+        "@actions/exec": "^1.0.1",
+        "@actions/glob": "^0.1.0",
+        "@actions/http-client": "^1.0.8",
+        "@actions/io": "^1.0.1",
+        "semver": "^6.1.0",
+        "uuid": "^3.3.3"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
+        }
+      }
+    },
     "@actions/core": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.4.tgz",
@@ -26,6 +47,15 @@
         "@octokit/plugin-rest-endpoint-methods": "^3.10.0"
       }
     },
+    "@actions/glob": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.1.0.tgz",
+      "integrity": "sha512-lx8SzyQ2FE9+UUvjqY1f28QbTJv+w8qP7kHHbfQRhphrlcx0Mdmm1tZdGJzfxv1jxREa/sLW4Oy8CbGQKCJySA==",
+      "requires": {
+        "@actions/core": "^1.2.0",
+        "minimatch": "^3.0.4"
+      }
+    },
     "@actions/http-client": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.8.tgz",
@@ -496,8 +526,7 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
     "base": {
       "version": "0.11.2",
@@ -600,7 +629,6 @@
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
-      "dev": true,
       "requires": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -1019,8 +1047,7 @@
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
     },
     "concat-stream": {
       "version": "1.6.2",
@@ -2326,7 +2353,6 @@
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
       "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
-      "dev": true,
       "requires": {
         "brace-expansion": "^1.1.7"
       }
@@ -3722,6 +3748,11 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "uuid": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
+    },
     "v8-compile-cache": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.3.tgz",

package.json

@@ -1,6 +1,7 @@
 {
   "private": true,
   "dependencies": {
+    "@actions/cache": "*",
     "@actions/core": "*",
     "@actions/exec": "*",
     "@actions/github": "*"