Allow cache reaper to skip failing cache removal request (facebook#45593)

Summary:
Pull Request resolved: facebook#45593

I'm guessing either there is a race condition between Github removing cache entries when we're over budget OR there is an eventual consistency issue between reported cache entries and their removal.  Either way, this job is best efforts.  If a entry targetted for removal isn't there, great.

This change prevents the job from stopping if an entry no longer exists.

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D60106847

fbshipit-source-id: 252bba7bb0bbb91d279f06a39301491332cd5ace

Author: blakef

scripts/clean-gha-cache.js

@@ -10,6 +10,7 @@ const {execSync} = require('node:child_process');
 const CACHE_LIMIT = (10 * 1024 ** 3) * 0.9;
 // Doing this to capture node-modules- and the pre-existing node-cache-<platform>-yarn-<sha> entries
 const NODE_CACHE_KEY = 'node-';
+const NODE_CACHE_KEY_FULL = 'node-modules-';
 
 function cleanData(rawStr) {
   const now = new Date();
@@ -33,6 +34,19 @@ function cacheToString(entry) {
   return `[${hrs(entry.msSinceLastAccessed).padStart(7)}] ${mb(entry.sizeInBytes).padStart(7)} -> ${entry.key}`;
 }
 
+function cleanCache(cmd) {
+  try {
+    const msg = execSync(cmd, 'utf8');
+    return (msg.trim().length > 0) ? msg.trim() : '🪓';
+  } catch (e) {
+    // There can be race conditions between github cache cleanups and this script.
+    if (/Could not find a cache matching/.test(e.message)) {
+      return 'The cache entry no longer exists, skipping.';
+    }
+    return `Failed: '${e.message}', skipping.`;
+  }
+}
+
 function main() {
   const cacheUsage = cleanData(execSync(
     'gh cache list --sort last_accessed_at --json id,key,createdAt,lastAccessedAt,sizeInBytes --limit 1000',
@@ -51,8 +65,10 @@ function main() {
       key.startsWith(NODE_CACHE_KEY) && sizeInBytes > 1024 * 1024
     )
     .sort((a, b) => b.createdAt - a.createdAt);
-  // Leave the latest entry only
-  const keeping = nodeCacheUsage.pop();
+  // Find the oldest version of node-modules-*. It's still possible that we have legacy node-yarn-*
+  // entries if there are commits on branches of RN < 0.75-stable, so guard for this:
+  const idx = nodeCacheUsage.findLastIndex(({key}) => key.startsWith(NODE_CACHE_KEY_FULL));
+  const keeping = ((idx === -1) ? nodeCacheUsage : nodeCacheUsage.splice(idx, 1)).pop();
 
   console.log('TASK: clean up old node_modules cache entries.', keeping ? `\nkeeping ${cacheToString(keeping)}` : ' Skipping, no cache entries.');
   for (const entry of nodeCacheUsage) {
@@ -83,7 +99,7 @@ function main() {
     if (dryRun) {
       console.warn(`Skip: ${cmd}`);
     } else {
-      console.warn(`${cmd} 🪓 ${execSync(cmd, 'utf8').toString()}`);
+      console.warn(`${cmd} → ${cleanCache(cmd)}`);
     }
   }
 }