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Deepak Dahiya 2022-11-16 22:21:12 +00:00
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@ -230,13 +230,20 @@ jobs:
``` ```
</details> </details>
## Deleting caches ## Force deletion of caches overriding default cache eviction policy
We can not re-use caches from pull request branches in other branches like main, such caches can eat up the storage quota and hence causing thrashing on more useful branches like main. In order to resolve this issue, we can use [gh-actions-cache cli](https://github.com/actions/gh-actions-cache/) to delete caches. This workflow uses `gh-actions-cache` to delete all the caches created by all the pull requests. Caches have [branch scope restriction](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache) in place. This means that if caches for a specific branch are using a lot of storage quota, it may result into more frequently used caches from `default` branch getting thrashed. For example, if there are many pull requests happening on a repo and are creating caches, these cannot be used in default branch scope but will still occupy a lot of space till they get cleaned up by [eviction policy](https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#usage-limits-and-eviction-policy). But sometime we want to clean them up on a faster cadence so as to ensure default branch is not thrashing. In order to achieve this, [gh-actions-cache cli](https://github.com/actions/gh-actions-cache/) can be used to delete caches for specific branches.
``` This workflow uses `gh-actions-cache` to delete all the caches created by a branch.
<details>
<summary>Example</summary>
```yaml
name: cleanup-caches name: cleanup-caches
on: on:
workflow_dispatch pull_request:
types:
- closed
workflow_dispatch:
jobs: jobs:
release: release:
@ -250,22 +257,22 @@ jobs:
gh extension install actions/gh-actions-cache gh extension install actions/gh-actions-cache
REPO=${{ github.repository }} REPO=${{ github.repository }}
BRANCH=${{ github.ref }}
echo "Fetching list of cache key" echo "Fetching list of cache key"
## This will extract out all the cache keys for pull requests cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH | cut -f 1 )
cacheKeysForPR=$(gh actions-cache list -R $REPO | grep "refs/pull" | cut -d $'\t' -f 1 )
## Setting this to not fail the workflow while deleting duplicate cache keys. We can have same cache key for multiple branches based on the cache key generation.
set +e set +e
echo "Deleting caches..." echo "Deleting caches..."
for cacheKey in $cacheKeysForPR for cacheKey in $cacheKeysForPR
do do
gh actions-cache delete $cacheKey -R $REPO --confirm gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
done done
echo "Done" echo "Done"
env: env:
GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
``` ```
</details>
## Known practices and workarounds ## Known practices and workarounds
Following are some of the known practices/workarounds which community has used to fulfill specific requirements. You may choose to use them if suits your use case. Note these are not necessarily the only or the recommended solution. Following are some of the known practices/workarounds which community has used to fulfill specific requirements. You may choose to use them if suits your use case. Note these are not necessarily the only or the recommended solution.