Merge pull request #1775 from jasongin/readonly-cache-v5

Bump @actions/cache to v5.1.0 - handle read-only cache access

.licenses/npm/@actions/cache.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@actions/cache"
-version: 5.0.5
+version: 5.1.0
 type: npm
 summary: Actions cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/cache

README.md

@@ -109,6 +109,14 @@ The cache is scoped to the key, [version](#cache-version), and branch. The defau
 
 See [Matching a cache key](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#matching-a-cache-key) for more info.
 
+### Read-only access
+
+Some workflow runs only have read-only access to the cache. A common case is a workflow triggered by a pull request from a fork: such runs can **restore** existing caches but may not be permitted to **save** new ones.
+
+When the cache token is read-only, the save step does not fail the job. Instead, `@actions/cache` reports the denial once as a warning (for example, `Failed to save: ... cache write denied: ...`) and the step completes successfully without writing a cache entry. Restores in the same run continue to work as usual.
+
+> **Note** This applies to the action's normal save path as well as the standalone [Save action](./save/README.md). If you intentionally want a restore-only setup, see [Make cache read only / Reuse cache from centralized job](./caching-strategies.md#make-cache-read-only--reuse-cache-from-centralized-job).
+
 ### Example cache workflow
 
 #### Restoring and saving cache using a single action

RELEASES.md

@@ -25,6 +25,11 @@
 
 ## Changelog
 
+### 5.1.0
+
+- Bump `@actions/cache` to v5.1.0 to pick up [actions/toolkit#2435 Handle cache write error due to read-only token](https://github.com/actions/toolkit/pull/2435)
+- Switch redundant "Cache save failed" warning to debug log in save-only
+
 ### 5.0.4
 
 - Bump `minimatch` to v3.1.5 (fixes ReDoS via globstar patterns)

__tests__/saveOnly.test.ts

@@ -105,8 +105,10 @@ test("save with valid inputs uploads a cache", async () => {
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
 
-test("save failing logs the warning message", async () => {
+test("save failing logs the debug message", async () => {
+    const debugMock = jest.spyOn(core, "debug");
     const warningMock = jest.spyOn(core, "warning");
+    const failedMock = jest.spyOn(core, "setFailed");
 
     const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
 
@@ -115,6 +117,9 @@ test("save failing logs the warning message", async () => {
     testUtils.setInput(Inputs.Path, inputPath);
     testUtils.setInput(Inputs.UploadChunkSize, "4000000");
 
+    // A read-only / write-denied save surfaces to the action as saveCache resolving
+    // to -1; the toolkit has already logged the underlying reason. The action
+    // must not fail the job or emit its own warning.
     const cacheId = -1;
     const saveCacheMock = jest
         .spyOn(cache, "saveCache")
@@ -134,6 +139,7 @@ test("save failing logs the warning message", async () => {
         false
     );
 
-    expect(warningMock).toHaveBeenCalledTimes(1);
-    expect(warningMock).toHaveBeenCalledWith("Cache save failed.");
+    expect(debugMock).toHaveBeenCalledWith("Cache was not saved.");
+    expect(warningMock).not.toHaveBeenCalled();
+    expect(failedMock).not.toHaveBeenCalled();
 });

dist/restore-only/index.js

@@ -49,7 +49,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.FinalizeCacheError = exports.ReserveCacheError = exports.ValidationError = void 0;
+exports.FinalizeCacheError = exports.CacheWriteDeniedError = exports.CACHE_WRITE_DENIED_PREFIX = exports.ReserveCacheError = exports.ValidationError = void 0;
 exports.isFeatureAvailable = isFeatureAvailable;
 exports.restoreCache = restoreCache;
 exports.saveCache = saveCache;
@@ -77,6 +77,26 @@ class ReserveCacheError extends Error {
     }
 }
 exports.ReserveCacheError = ReserveCacheError;
+/**
+ * Stable prefix used by the cache receiver to signal that the token has
+ * no writable scopes (read-only cache policy). Consumers can match on
+ * this prefix to distinguish policy denials from ordinary contention.
+ */
+exports.CACHE_WRITE_DENIED_PREFIX = 'cache write denied:';
+/**
+ * Extends ReserveCacheError for source-compatibility: existing
+ * `instanceof ReserveCacheError` checks and `typedError.name ===
+ * ReserveCacheError.name` paths keep working, while consumers that want to
+ * distinguish a policy denial can check for CacheWriteDeniedError.name.
+ */
+class CacheWriteDeniedError extends ReserveCacheError {
+    constructor(message) {
+        super(message);
+        this.name = 'CacheWriteDeniedError';
+        Object.setPrototypeOf(this, CacheWriteDeniedError.prototype);
+    }
+}
+exports.CacheWriteDeniedError = CacheWriteDeniedError;
 class FinalizeCacheError extends Error {
     constructor(message) {
         super(message);
@@ -387,7 +407,11 @@ function saveCacheV1(paths_1, key_1, options_1) {
                 throw new Error((_d = (_c = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _c === void 0 ? void 0 : _c.message) !== null && _d !== void 0 ? _d : `Cache size of ~${Math.round(archiveFileSize / (1024 * 1024))} MB (${archiveFileSize} B) is over the data cap limit, not saving cache.`);
             }
             else {
-                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${(_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message}`);
+                const detailMessage = (_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message;
+                if (detailMessage === null || detailMessage === void 0 ? void 0 : detailMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${detailMessage}`);
+                }
+                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${detailMessage}`);
             }
             core.debug(`Saving Cache (ID: ${cacheId})`);
             yield cacheHttpClient.saveCache(cacheId, archivePath, '', options);
@@ -397,6 +421,9 @@ function saveCacheV1(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -435,6 +462,7 @@ function saveCacheV1(paths_1, key_1, options_1) {
  */
 function saveCacheV2(paths_1, key_1, options_1) {
     return __awaiter(this, arguments, void 0, function* (paths, key, options, enableCrossOsArchive = false) {
+        var _a;
         // Override UploadOptions to force the use of Azure
         // ...options goes first because we want to override the default values
         // set in UploadOptions with these specific figures
@@ -470,7 +498,11 @@ function saveCacheV2(paths_1, key_1, options_1) {
             try {
                 const response = yield twirpClient.CreateCacheEntry(request);
                 if (!response.ok) {
-                    if (response.message) {
+                    // Skip the redundant inner warning when the receiver signalled a
+                    // policy denial: the outer catch arm below will log a single
+                    // customer-facing warning.
+                    if (response.message &&
+                        !response.message.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
                         core.warning(`Cache reservation failed: ${response.message}`);
                     }
                     throw new Error(response.message || 'Response was not ok');
@@ -479,6 +511,10 @@ function saveCacheV2(paths_1, key_1, options_1) {
             }
             catch (error) {
                 core.debug(`Failed to reserve cache: ${error}`);
+                const errorMessage = (_a = error === null || error === void 0 ? void 0 : error.message) !== null && _a !== void 0 ? _a : '';
+                if (errorMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${errorMessage}`);
+                }
                 throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache.`);
             }
             core.debug(`Attempting to upload cache located at: ${archivePath}`);
@@ -503,6 +539,9 @@ function saveCacheV2(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -87527,7 +87566,7 @@ function randomUUID() {
 /***/ ((module) => {
 
 "use strict";
-module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.0.5","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
+module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.1.0","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
 
 /***/ })
 

dist/restore/index.js

@@ -49,7 +49,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.FinalizeCacheError = exports.ReserveCacheError = exports.ValidationError = void 0;
+exports.FinalizeCacheError = exports.CacheWriteDeniedError = exports.CACHE_WRITE_DENIED_PREFIX = exports.ReserveCacheError = exports.ValidationError = void 0;
 exports.isFeatureAvailable = isFeatureAvailable;
 exports.restoreCache = restoreCache;
 exports.saveCache = saveCache;
@@ -77,6 +77,26 @@ class ReserveCacheError extends Error {
     }
 }
 exports.ReserveCacheError = ReserveCacheError;
+/**
+ * Stable prefix used by the cache receiver to signal that the token has
+ * no writable scopes (read-only cache policy). Consumers can match on
+ * this prefix to distinguish policy denials from ordinary contention.
+ */
+exports.CACHE_WRITE_DENIED_PREFIX = 'cache write denied:';
+/**
+ * Extends ReserveCacheError for source-compatibility: existing
+ * `instanceof ReserveCacheError` checks and `typedError.name ===
+ * ReserveCacheError.name` paths keep working, while consumers that want to
+ * distinguish a policy denial can check for CacheWriteDeniedError.name.
+ */
+class CacheWriteDeniedError extends ReserveCacheError {
+    constructor(message) {
+        super(message);
+        this.name = 'CacheWriteDeniedError';
+        Object.setPrototypeOf(this, CacheWriteDeniedError.prototype);
+    }
+}
+exports.CacheWriteDeniedError = CacheWriteDeniedError;
 class FinalizeCacheError extends Error {
     constructor(message) {
         super(message);
@@ -387,7 +407,11 @@ function saveCacheV1(paths_1, key_1, options_1) {
                 throw new Error((_d = (_c = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _c === void 0 ? void 0 : _c.message) !== null && _d !== void 0 ? _d : `Cache size of ~${Math.round(archiveFileSize / (1024 * 1024))} MB (${archiveFileSize} B) is over the data cap limit, not saving cache.`);
             }
             else {
-                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${(_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message}`);
+                const detailMessage = (_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message;
+                if (detailMessage === null || detailMessage === void 0 ? void 0 : detailMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${detailMessage}`);
+                }
+                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${detailMessage}`);
             }
             core.debug(`Saving Cache (ID: ${cacheId})`);
             yield cacheHttpClient.saveCache(cacheId, archivePath, '', options);
@@ -397,6 +421,9 @@ function saveCacheV1(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -435,6 +462,7 @@ function saveCacheV1(paths_1, key_1, options_1) {
  */
 function saveCacheV2(paths_1, key_1, options_1) {
     return __awaiter(this, arguments, void 0, function* (paths, key, options, enableCrossOsArchive = false) {
+        var _a;
         // Override UploadOptions to force the use of Azure
         // ...options goes first because we want to override the default values
         // set in UploadOptions with these specific figures
@@ -470,7 +498,11 @@ function saveCacheV2(paths_1, key_1, options_1) {
             try {
                 const response = yield twirpClient.CreateCacheEntry(request);
                 if (!response.ok) {
-                    if (response.message) {
+                    // Skip the redundant inner warning when the receiver signalled a
+                    // policy denial: the outer catch arm below will log a single
+                    // customer-facing warning.
+                    if (response.message &&
+                        !response.message.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
                         core.warning(`Cache reservation failed: ${response.message}`);
                     }
                     throw new Error(response.message || 'Response was not ok');
@@ -479,6 +511,10 @@ function saveCacheV2(paths_1, key_1, options_1) {
             }
             catch (error) {
                 core.debug(`Failed to reserve cache: ${error}`);
+                const errorMessage = (_a = error === null || error === void 0 ? void 0 : error.message) !== null && _a !== void 0 ? _a : '';
+                if (errorMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${errorMessage}`);
+                }
                 throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache.`);
             }
             core.debug(`Attempting to upload cache located at: ${archivePath}`);
@@ -503,6 +539,9 @@ function saveCacheV2(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -87527,7 +87566,7 @@ function randomUUID() {
 /***/ ((module) => {
 
 "use strict";
-module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.0.5","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
+module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.1.0","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
 
 /***/ })
 

dist/save-only/index.js

@@ -49,7 +49,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.FinalizeCacheError = exports.ReserveCacheError = exports.ValidationError = void 0;
+exports.FinalizeCacheError = exports.CacheWriteDeniedError = exports.CACHE_WRITE_DENIED_PREFIX = exports.ReserveCacheError = exports.ValidationError = void 0;
 exports.isFeatureAvailable = isFeatureAvailable;
 exports.restoreCache = restoreCache;
 exports.saveCache = saveCache;
@@ -77,6 +77,26 @@ class ReserveCacheError extends Error {
     }
 }
 exports.ReserveCacheError = ReserveCacheError;
+/**
+ * Stable prefix used by the cache receiver to signal that the token has
+ * no writable scopes (read-only cache policy). Consumers can match on
+ * this prefix to distinguish policy denials from ordinary contention.
+ */
+exports.CACHE_WRITE_DENIED_PREFIX = 'cache write denied:';
+/**
+ * Extends ReserveCacheError for source-compatibility: existing
+ * `instanceof ReserveCacheError` checks and `typedError.name ===
+ * ReserveCacheError.name` paths keep working, while consumers that want to
+ * distinguish a policy denial can check for CacheWriteDeniedError.name.
+ */
+class CacheWriteDeniedError extends ReserveCacheError {
+    constructor(message) {
+        super(message);
+        this.name = 'CacheWriteDeniedError';
+        Object.setPrototypeOf(this, CacheWriteDeniedError.prototype);
+    }
+}
+exports.CacheWriteDeniedError = CacheWriteDeniedError;
 class FinalizeCacheError extends Error {
     constructor(message) {
         super(message);
@@ -387,7 +407,11 @@ function saveCacheV1(paths_1, key_1, options_1) {
                 throw new Error((_d = (_c = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _c === void 0 ? void 0 : _c.message) !== null && _d !== void 0 ? _d : `Cache size of ~${Math.round(archiveFileSize / (1024 * 1024))} MB (${archiveFileSize} B) is over the data cap limit, not saving cache.`);
             }
             else {
-                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${(_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message}`);
+                const detailMessage = (_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message;
+                if (detailMessage === null || detailMessage === void 0 ? void 0 : detailMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${detailMessage}`);
+                }
+                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${detailMessage}`);
             }
             core.debug(`Saving Cache (ID: ${cacheId})`);
             yield cacheHttpClient.saveCache(cacheId, archivePath, '', options);
@@ -397,6 +421,9 @@ function saveCacheV1(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -435,6 +462,7 @@ function saveCacheV1(paths_1, key_1, options_1) {
  */
 function saveCacheV2(paths_1, key_1, options_1) {
     return __awaiter(this, arguments, void 0, function* (paths, key, options, enableCrossOsArchive = false) {
+        var _a;
         // Override UploadOptions to force the use of Azure
         // ...options goes first because we want to override the default values
         // set in UploadOptions with these specific figures
@@ -470,7 +498,11 @@ function saveCacheV2(paths_1, key_1, options_1) {
             try {
                 const response = yield twirpClient.CreateCacheEntry(request);
                 if (!response.ok) {
-                    if (response.message) {
+                    // Skip the redundant inner warning when the receiver signalled a
+                    // policy denial: the outer catch arm below will log a single
+                    // customer-facing warning.
+                    if (response.message &&
+                        !response.message.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
                         core.warning(`Cache reservation failed: ${response.message}`);
                     }
                     throw new Error(response.message || 'Response was not ok');
@@ -479,6 +511,10 @@ function saveCacheV2(paths_1, key_1, options_1) {
             }
             catch (error) {
                 core.debug(`Failed to reserve cache: ${error}`);
+                const errorMessage = (_a = error === null || error === void 0 ? void 0 : error.message) !== null && _a !== void 0 ? _a : '';
+                if (errorMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${errorMessage}`);
+                }
                 throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache.`);
             }
             core.debug(`Attempting to upload cache located at: ${archivePath}`);
@@ -503,6 +539,9 @@ function saveCacheV2(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -46436,7 +46475,11 @@ function saveOnlyRun(earlyExit) {
         try {
             const cacheId = yield saveImpl(new stateProvider_1.NullStateProvider());
             if (cacheId === -1) {
-                core.warning(`Cache save failed.`);
+                // The toolkit's saveCache already logs the underlying reason at
+                // the appropriate severity (warning for most failures, info for
+                // benign concurrency races, error for 5xx). Avoid emitting a
+                // generic warning here that would duplicate or mask that signal.
+                core.debug(`Cache was not saved.`);
             }
         }
         catch (err) {
@@ -87540,7 +87583,7 @@ function randomUUID() {
 /***/ ((module) => {
 
 "use strict";
-module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.0.5","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
+module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.1.0","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
 
 /***/ })
 

dist/save/index.js

@@ -49,7 +49,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.FinalizeCacheError = exports.ReserveCacheError = exports.ValidationError = void 0;
+exports.FinalizeCacheError = exports.CacheWriteDeniedError = exports.CACHE_WRITE_DENIED_PREFIX = exports.ReserveCacheError = exports.ValidationError = void 0;
 exports.isFeatureAvailable = isFeatureAvailable;
 exports.restoreCache = restoreCache;
 exports.saveCache = saveCache;
@@ -77,6 +77,26 @@ class ReserveCacheError extends Error {
     }
 }
 exports.ReserveCacheError = ReserveCacheError;
+/**
+ * Stable prefix used by the cache receiver to signal that the token has
+ * no writable scopes (read-only cache policy). Consumers can match on
+ * this prefix to distinguish policy denials from ordinary contention.
+ */
+exports.CACHE_WRITE_DENIED_PREFIX = 'cache write denied:';
+/**
+ * Extends ReserveCacheError for source-compatibility: existing
+ * `instanceof ReserveCacheError` checks and `typedError.name ===
+ * ReserveCacheError.name` paths keep working, while consumers that want to
+ * distinguish a policy denial can check for CacheWriteDeniedError.name.
+ */
+class CacheWriteDeniedError extends ReserveCacheError {
+    constructor(message) {
+        super(message);
+        this.name = 'CacheWriteDeniedError';
+        Object.setPrototypeOf(this, CacheWriteDeniedError.prototype);
+    }
+}
+exports.CacheWriteDeniedError = CacheWriteDeniedError;
 class FinalizeCacheError extends Error {
     constructor(message) {
         super(message);
@@ -387,7 +407,11 @@ function saveCacheV1(paths_1, key_1, options_1) {
                 throw new Error((_d = (_c = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _c === void 0 ? void 0 : _c.message) !== null && _d !== void 0 ? _d : `Cache size of ~${Math.round(archiveFileSize / (1024 * 1024))} MB (${archiveFileSize} B) is over the data cap limit, not saving cache.`);
             }
             else {
-                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${(_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message}`);
+                const detailMessage = (_e = reserveCacheResponse === null || reserveCacheResponse === void 0 ? void 0 : reserveCacheResponse.error) === null || _e === void 0 ? void 0 : _e.message;
+                if (detailMessage === null || detailMessage === void 0 ? void 0 : detailMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${detailMessage}`);
+                }
+                throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache. More details: ${detailMessage}`);
             }
             core.debug(`Saving Cache (ID: ${cacheId})`);
             yield cacheHttpClient.saveCache(cacheId, archivePath, '', options);
@@ -397,6 +421,9 @@ function saveCacheV1(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -435,6 +462,7 @@ function saveCacheV1(paths_1, key_1, options_1) {
  */
 function saveCacheV2(paths_1, key_1, options_1) {
     return __awaiter(this, arguments, void 0, function* (paths, key, options, enableCrossOsArchive = false) {
+        var _a;
         // Override UploadOptions to force the use of Azure
         // ...options goes first because we want to override the default values
         // set in UploadOptions with these specific figures
@@ -470,7 +498,11 @@ function saveCacheV2(paths_1, key_1, options_1) {
             try {
                 const response = yield twirpClient.CreateCacheEntry(request);
                 if (!response.ok) {
-                    if (response.message) {
+                    // Skip the redundant inner warning when the receiver signalled a
+                    // policy denial: the outer catch arm below will log a single
+                    // customer-facing warning.
+                    if (response.message &&
+                        !response.message.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
                         core.warning(`Cache reservation failed: ${response.message}`);
                     }
                     throw new Error(response.message || 'Response was not ok');
@@ -479,6 +511,10 @@ function saveCacheV2(paths_1, key_1, options_1) {
             }
             catch (error) {
                 core.debug(`Failed to reserve cache: ${error}`);
+                const errorMessage = (_a = error === null || error === void 0 ? void 0 : error.message) !== null && _a !== void 0 ? _a : '';
+                if (errorMessage.startsWith(exports.CACHE_WRITE_DENIED_PREFIX)) {
+                    throw new CacheWriteDeniedError(`Unable to reserve cache with key ${key}. More details: ${errorMessage}`);
+                }
                 throw new ReserveCacheError(`Unable to reserve cache with key ${key}, another job may be creating this cache.`);
             }
             core.debug(`Attempting to upload cache located at: ${archivePath}`);
@@ -503,6 +539,9 @@ function saveCacheV2(paths_1, key_1, options_1) {
             if (typedError.name === ValidationError.name) {
                 throw error;
             }
+            else if (typedError.name === CacheWriteDeniedError.name) {
+                core.warning(`Failed to save: ${typedError.message}`);
+            }
             else if (typedError.name === ReserveCacheError.name) {
                 core.info(`Failed to save: ${typedError.message}`);
             }
@@ -46436,7 +46475,11 @@ function saveOnlyRun(earlyExit) {
         try {
             const cacheId = yield saveImpl(new stateProvider_1.NullStateProvider());
             if (cacheId === -1) {
-                core.warning(`Cache save failed.`);
+                // The toolkit's saveCache already logs the underlying reason at
+                // the appropriate severity (warning for most failures, info for
+                // benign concurrency races, error for 5xx). Avoid emitting a
+                // generic warning here that would duplicate or mask that signal.
+                core.debug(`Cache was not saved.`);
             }
         }
         catch (err) {
@@ -87540,7 +87583,7 @@ function randomUUID() {
 /***/ ((module) => {
 
 "use strict";
-module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.0.5","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
+module.exports = /*#__PURE__*/JSON.parse('{"name":"@actions/cache","version":"5.1.0","preview":true,"description":"Actions cache lib","keywords":["github","actions","cache"],"homepage":"https://github.com/actions/toolkit/tree/main/packages/cache","license":"MIT","main":"lib/cache.js","types":"lib/cache.d.ts","directories":{"lib":"lib","test":"__tests__"},"files":["lib","!.DS_Store"],"publishConfig":{"access":"public"},"repository":{"type":"git","url":"git+https://github.com/actions/toolkit.git","directory":"packages/cache"},"scripts":{"audit-moderate":"npm install && npm audit --json --audit-level=moderate > audit.json","test":"echo \\"Error: run tests from root\\" && exit 1","tsc":"tsc"},"bugs":{"url":"https://github.com/actions/toolkit/issues"},"dependencies":{"@actions/core":"^2.0.0","@actions/exec":"^2.0.0","@actions/glob":"^0.5.1","@protobuf-ts/runtime-rpc":"^2.11.1","@actions/http-client":"^3.0.2","@actions/io":"^2.0.0","@azure/abort-controller":"^1.1.0","@azure/core-rest-pipeline":"^1.22.0","@azure/storage-blob":"^12.29.1","semver":"^6.3.1"},"devDependencies":{"@types/node":"^24.1.0","@types/semver":"^6.0.0","@protobuf-ts/plugin":"^2.9.4","typescript":"^5.2.2"},"overrides":{"uri-js":"npm:uri-js-replace@^1.0.1","node-fetch":"^3.3.2"}}');
 
 /***/ })
 

package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "cache",
-  "version": "5.0.4",
+  "version": "5.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cache",
-      "version": "5.0.4",
+      "version": "5.1.0",
       "license": "MIT",
       "dependencies": {
-        "@actions/cache": "^5.0.5",
+        "@actions/cache": "^5.1.0",
         "@actions/core": "^2.0.3",
         "@actions/exec": "^2.0.0",
         "@actions/io": "^2.0.0"
@@ -39,9 +39,9 @@
       }
     },
     "node_modules/@actions/cache": {
-      "version": "5.0.5",
-      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-5.0.5.tgz",
-      "integrity": "sha512-jiQSg0gfd+C2KPgcmdCOq7dCuCIQQWQ4b1YfGIRaaA9w7PJbRwTOcCz4LiFEUnqZGf0ha/8OKL3BeNwetHzYsQ==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-5.1.0.tgz",
+      "integrity": "sha512-kTIj4YPrjjRPKSGlj7f8eq+Pijoy/SKBEbJcAwNsQTFGEF29NGqj1mqD02/PmhV6r4bRAixycexAWpmUJ2aCwg==",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^2.0.0",
@@ -6218,9 +6218,9 @@
       "license": "ISC"
     },
     "node_modules/picomatch": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
-      "integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
+      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
       "dev": true,
       "license": "MIT",
       "engines": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cache",
-  "version": "5.0.4",
+  "version": "5.1.0",
   "private": true,
   "description": "Cache dependencies and build outputs",
   "main": "dist/restore/index.js",
@@ -23,7 +23,7 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^5.0.5",
+    "@actions/cache": "^5.1.0",
     "@actions/core": "^2.0.3",
     "@actions/exec": "^2.0.0",
     "@actions/io": "^2.0.0"

src/saveImpl.ts

@@ -84,7 +84,11 @@ export async function saveOnlyRun(
     try {
         const cacheId = await saveImpl(new NullStateProvider());
         if (cacheId === -1) {
-            core.warning(`Cache save failed.`);
+            // The toolkit's saveCache already logs the underlying reason at
+            // the appropriate severity (warning for most failures, info for
+            // benign concurrency races, error for 5xx). Avoid emitting a
+            // generic warning here that would duplicate or mask that signal.
+            core.debug(`Cache was not saved.`);
         }
     } catch (err) {
         console.error(err);