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feat: add cache-write input for read-only cache mode

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Add a 'cache-write' input (default: true) that controls whether the cache
is saved at the end of the workflow. When set to 'false', the action will
restore cached dependencies but skip saving, providing a read-only cache
mode.

This is useful for preventing cache poisoning attacks from untrusted PR
builds while still benefiting from cached dependencies.
This commit is contained in:
Salman Chishti 2026-03-09 05:35:47 -07:00 • committed by GitHub
commit 974c02c884
3 changed files with 14 additions and 0 deletions
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6
src/cache-save.ts
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@ -16,6 +16,12 @@ process.on('uncaughtException', e => {
// Added early exit to resolve issue with slow post action step:
export async function run(earlyExit?: boolean) {
try {
const cacheWriteEnabled = core.getInput('cache-write');
if (cacheWriteEnabled === 'false') {
core.info('Cache write is disabled (read-only mode). Skipping cache save.');
return;
}
const cacheLock = core.getState(State.CachePackageManager);
if (cacheLock) {