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feat: add size-based cache eviction (#1170)

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The cache server retired entries 30 days after creation regardless of use, so a job that ran often enough to keep its cache warm still lost it on a fixed schedule. Nothing bounded the disk either.

Retention now counts from last access alone, and a repository over its limit sheds least recently accessed entries until it fits, enforced on commit as well as on the periodic sweep.

```yaml
cache:
  retention: 168h        # remove entries not accessed for seven days
  repo_size_limit: 10GB  # cap each repository
  size_limit: 0          # cap the whole cache, off by default
  sweep_interval: 1h     # minimum time between sweeps
```

Sizes accept `10GB`, `512mb`, `1TiB` or a plain byte count, binary either way. Leave a key out for its default; `0` turns a limit off, and `0s` does the same for `retention`. Whatever these allow, the cache also sheds entries to keep free space above `health_check.min_free_disk_space_mb` when health checks are enabled, so it cannot grow past the point where the runner stops accepting work.

Supporting fixes: serving an entry stamps its access time, so a find cannot hand a job a download URL for an entry the next eviction is about to remove; an entry larger than the limit is dropped on its own account rather than emptying its repository to make room; and a blob that cannot be unlinked keeps its row, so the next sweep retries instead of orphaning bytes no limit can account for.

Closes https://gitea.com/gitea/runner/issues/1168

---------

Co-authored-by: silverwind <me@silverwind.io>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1170
Reviewed-by: silverwind <2021+silverwind@noreply.gitea.com>
This commit is contained in:
bircni
2026-08-18 15:32:53 +00:00
parent 6c6a878403
commit be90c01468
21 changed files with 750 additions and 170 deletions
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internal/pkg/config/config.example.yaml
+14
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@@ -159,6 +159,20 @@ cache:
# the action's own bundle, keeping the untouched copy beside it. The same edit lets the stock
# upload-artifact and download-artifact work here. A bundle that does not match is left alone.
#v2: true
# How the cache server discards entries, ignored when external_server is set since that
# server applies its own. Leave a setting out for its default; 0s or 0 turns the three
# limits off. Sizes accept 10GB, 512mb, 1TiB or a plain byte count, binary either way.
# Whatever these allow, the cache still sheds entries to keep free space on its volume
# above health_check.min_free_disk_space_mb when health checks are enabled.
# Remove entries nothing has read or written within this window. Only last access counts.
#retention: 168h
# Cap one repository, removing its least recently accessed entries until it fits. An entry
# larger than the limit is dropped rather than emptying the repository to make room.
#repo_size_limit: 10GB
# Cap the whole cache the same way. Off by default, since the free space floor bounds it.
#size_limit: 0
# Minimum time between two eviction sweeps. This one has no "off".
#sweep_interval: 1h
container:
# Specifies the network to which the container will connect.