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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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@@ -14,6 +14,7 @@ require (
github.com/distribution/reference v0.6.0
github.com/docker/cli v29.7.1+incompatible
github.com/docker/go-connections v0.8.1
github.com/docker/go-units v0.5.0
github.com/go-git/go-billy/v5 v5.9.1
github.com/go-git/go-git/v5 v5.19.2
github.com/gobwas/glob v0.2.3
@@ -61,7 +62,6 @@ require (
github.com/cyphar/filepath-securejoin v0.6.1 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/docker/docker-credential-helpers v0.9.6 // indirect
github.com/docker/go-units v0.5.0 // indirect
github.com/emirpasic/gods v1.18.1 // indirect
github.com/fatih/color v1.19.0 // indirect
github.com/felixge/httpsnoop v1.0.4 // indirect