Add force-overwrite for cache

Update examples

README.md

@@ -14,6 +14,10 @@ See ["Caching dependencies to speed up workflows"](https://docs.github.com/en/ac
 
 ## What's New
 
+### Unreleased
+
+* Added the `force-overwrite` flag to force overwrite any existing cache for incremental caching
+
 ### v4
 
 * Updated to node 20
@@ -95,7 +99,7 @@ jobs:
 
     - name: Cache Primes
       id: cache-primes
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: prime-numbers
         key: ${{ runner.os }}-primes
@@ -126,7 +130,7 @@ jobs:
 
     - name: Restore cached Primes
       id: cache-primes-restore
-      uses: actions/cache/restore@v3
+      uses: actions/cache/restore@v4
       with:
         path: |
           path/to/dependencies
@@ -137,7 +141,7 @@ jobs:
     .
     - name: Save Primes
       id: cache-primes-save
-      uses: actions/cache/save@v3
+      uses: actions/cache/save@v4
       with:
         path: |
           path/to/dependencies
@@ -191,7 +195,7 @@ A cache key can include any of the contexts, functions, literals, and operators
 For example, using the [`hashFiles`](https://docs.github.com/en/actions/learn-github-actions/expressions#hashfiles) function allows you to create a new cache when dependencies change.
 
 ```yaml
-  - uses: actions/cache@v3
+  - uses: actions/cache@v4
     with:
       path: |
         path/to/dependencies
@@ -209,7 +213,7 @@ Additionally, you can use arbitrary command output in a cache key, such as a dat
       echo "date=$(/bin/date -u "+%Y%m%d")" >> $GITHUB_OUTPUT
     shell: bash
 
-  - uses: actions/cache@v3
+  - uses: actions/cache@v4
     with:
       path: path/to/dependencies
       key: ${{ runner.os }}-${{ steps.get-date.outputs.date }}-${{ hashFiles('**/lockfiles') }}
@@ -231,7 +235,7 @@ Example:
 steps:
   - uses: actions/checkout@v3
 
-  - uses: actions/cache@v3
+  - uses: actions/cache@v4
     id: cache
     with:
       path: path/to/dependencies
@@ -263,7 +267,7 @@ jobs:
 
       - name: Cache Primes
         id: cache-primes
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: prime-numbers
           key: primes
@@ -274,7 +278,7 @@ jobs:
 
       - name: Cache Numbers
         id: cache-numbers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: numbers
           key: primes
@@ -290,7 +294,7 @@ jobs:
 
       - name: Cache Primes
         id: cache-primes
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: prime-numbers
           key: primes

action.yml

@@ -29,7 +29,11 @@ inputs:
   save-always:
     description: 'Run the post step to save the cache even if another step before fails'
     default: 'false'
-    required: false    
+    required: false
+  force-overwrite:
+    description: 'Delete any previous (incremental) cache before pushing a new cache even if a cache for the primary cache key exists'
+    default: 'false'
+    required: false
 outputs:
   cache-hit:
     description: 'A boolean value to indicate an exact match was found for the primary key'

src/constants.ts

@@ -5,7 +5,8 @@ export enum Inputs {
     UploadChunkSize = "upload-chunk-size", // Input for cache, save action
     EnableCrossOsArchive = "enableCrossOsArchive", // Input for cache, restore, save action
     FailOnCacheMiss = "fail-on-cache-miss", // Input for cache, restore action
-    LookupOnly = "lookup-only" // Input for cache, restore action
+    LookupOnly = "lookup-only", // Input for cache, restore action
+    ForceOverwrite = "force-overwrite" // Input for cache action
 }
 
 export enum Outputs {

src/saveImpl.ts

@@ -8,6 +8,7 @@ import {
     StateProvider
 } from "./stateProvider";
 import * as utils from "./utils/actionUtils";
+import { issueCommand } from "@actions/core/lib/command";
 
 // Catch and log any unhandled exceptions.  These exceptions can leak out of the uploadChunk method in
 // @actions/toolkit when a failed upload closes the file descriptor causing any in-process reads to
@@ -47,13 +48,18 @@ export async function saveImpl(
         // NO-OP in case of SaveOnly action
         const restoredKey = stateProvider.getCacheState();
 
-        if (utils.isExactKeyMatch(primaryKey, restoredKey)) {
+        const forceOverwrite = utils.getInputAsBool(Inputs.ForceOverwrite);
+        if (utils.isExactKeyMatch(primaryKey, restoredKey) && !forceOverwrite) {
             core.info(
-                `Cache hit occurred on the primary key ${primaryKey}, not saving cache.`
+                `Cache hit occurred on the primary key ${primaryKey} and force-overwrite is disabled, not saving cache.`
             );
             return;
         }
 
+        if (utils.isExactKeyMatch(primaryKey, restoredKey) && forceOverwrite) {
+            await issueCommand('actions-cache delete', {}, primaryKey);
+        }
+
         const cachePaths = utils.getInputAsArray(Inputs.Path, {
             required: true
         });