Add force-overwrite for cache

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

action.yml

@@ -30,6 +30,10 @@ inputs:
     description: 'Run the post step to save the cache even if another step before fails'
     default: '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
         });