Allow entries with same Job ID to match in different workflows

Fixes #1017

README.md

@@ -259,9 +259,9 @@ This allows the most recent state to always be available in the GitHub actions c
 ### Finding a matching cache entry
 
 In most cases, no exact match will exist for the cache key. Instead, the Gradle User Home will be restored for the closest matching cache entry, using a set of "restore keys". The entries will be matched with the following precedence:
-- An exact match on OS, workflow, job, matrix and Git SHA
-- The most recent entry saved for the same OS, workflow, job and matrix values
-- The most recent entry saved for the same OS, workflow and job
+- An exact match on OS, workflow name, job id, matrix and Git SHA
+- The most recent entry saved for the same OS, workflow name, job id and matrix values
+- The most recent entry saved for the same OS and job id
 - The most recent entry saved for the same OS
 
 Due to branch scoping of cache entries, the above match will be first performed for entries from the same branch, and then for the default ('main') branch.

src/cache-utils.ts

@@ -86,10 +86,10 @@ export function generateCacheKey(cacheName: string): CacheKey {
     // At the most general level, share caches for all executions on the same OS
     const cacheKeyForEnvironment = `${cacheKeyBase}|${getCacheKeyEnvironment()}`
 
-    // Prefer caches that run this job
+    // Then prefer caches that run job with the same ID
     const cacheKeyForJob = `${cacheKeyForEnvironment}|${getCacheKeyJob()}`
 
-    // Prefer (even more) jobs that run this job with the same context (matrix)
+    // Prefer (even more) jobs that run this job in the same workflow with the same context (matrix)
     const cacheKeyForJobContext = `${cacheKeyForJob}[${getCacheKeyJobInstance()}]`
 
     // Exact match on Git SHA
@@ -113,12 +113,7 @@ function getCacheKeyEnvironment(): string {
 }
 
 function getCacheKeyJob(): string {
-    return process.env[CACHE_KEY_JOB_VAR] || getCacheKeyForJob(github.context.workflow, github.context.job)
-}
-
-export function getCacheKeyForJob(workflowName: string, jobId: string): string {
-    const sanitizedWorkflow = workflowName.replace(/,/g, '').toLowerCase()
-    return `${sanitizedWorkflow}-${jobId}`
+    return process.env[CACHE_KEY_JOB_VAR] || github.context.job
 }
 
 function getCacheKeyJobInstance(): string {
@@ -127,25 +122,11 @@ function getCacheKeyJobInstance(): string {
         return override
     }
 
-    // By default, we hash the full `matrix` data for the run, to uniquely identify this job invocation
+    // By default, we hash the workflow name and the full `matrix` data for the run, to uniquely identify this job invocation
     // The only way we can obtain the `matrix` data is via the `workflow-job-context` parameter in action.yml.
+    const workflowName = github.context.workflow
     const workflowJobContext = params.getJobMatrix()
-    return hashStrings([workflowJobContext])
-}
-
-export function getUniqueLabelForJobInstance(): string {
-    return getUniqueLabelForJobInstanceValues(github.context.workflow, github.context.job, params.getJobMatrix())
-}
-
-export function getUniqueLabelForJobInstanceValues(workflow: string, jobId: string, matrixJson: string): string {
-    const matrix = JSON.parse(matrixJson)
-    const matrixString = Object.values(matrix).join('-')
-    const label = matrixString ? `${workflow}-${jobId}-${matrixString}` : `${workflow}-${jobId}`
-    return sanitize(label)
-}
-
-function sanitize(value: string): string {
-    return value.replace(/[^a-zA-Z0-9_-]/g, '').toLowerCase()
+    return hashStrings([workflowName, workflowJobContext])
 }
 
 function getCacheKeyJobExecution(): string {