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cache_retain.yml
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# Copyright (C) 2023 and later: Unicode, Inc. and others.
# License & terms of use: http://www.unicode.org/copyright.html
#
# This workflow is designed to keep specific caches on the main
# branch from getting evicted according to the Github Actions policy
# (currently in 2023: 7 days) in cases where the cost to construct
# the cache is high, especially in cases where there is flakiness
# (ex: network loss / throttling when downloading artifacts) involved in
# constructing the cache.
#
# Preventing a cache from eviction using this workflow requires that:
# - the cache is not too big that it starves other caches
# from using the shared cache quota for the repository
# - the cache key is specific enough to avoid cache collisions, according
# to good cache key design
# - the cache key is not overly specific to cause unnecessary cache misses
# (resulting in duplicate caches values, thereby wasting space), according
# to good cache key design
# - For more details, see: https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows
name: Retain Specific Caches
on:
schedule:
# Because the Github Actions cache eviction policy is every 7 days,
# this cron schedule is set to run every 6 days to ensure retention
- cron: '0 12 */6 * *'
jobs:
retain-maven-cache:
name: Run all tests with Maven
runs-on: ubuntu-latest
# Only run this on the upstream repo. Otherwise, running in a personal fork will cause
# Github to disable the personal fork copy of the workflow
# (Github complains about running a scheduled workflow on a repo with > 60 days of inactivity)
if: github.ref == 'refs/heads/main' && github.repository == 'unicode-org/unicodetools'
steps:
- name: Checkout and setup
uses: actions/checkout@v2
- name: Set up JDK 11
uses: actions/setup-java@v1
with:
java-version: 11
- name: Cache local Maven repository
uses: actions/cache@v2
with:
path: ~/.m2/repository
key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
restore-keys: |
${{ runner.os }}-maven-
- name: Set up out-of-source output dir
run: |
mkdir -p unicodetools/mine/Generated/BIN
# Omitting running any build instructions.
#
# The point is to touch the cache before the TTL causes it to get evicted.
# For Github Actions, the cache is preserved only when the cache action is
# invoked and the job completes successfully.
#
# It seems sufficient for the CI job here to finish successfully by
# trivially running nothing.