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package worker
import (
"math"
"time"
"github.com/moby/buildkit/client"
)
const defaultCap int64 = 2e9 // 2GB
// tempCachePercent represents the percentage ratio of the cache size in bytes to temporarily keep for a short period of time (couple of days)
// over the total cache size in bytes. Because there is no perfect value, a mathematically pleasing one was chosen.
// The value is approximately 13.8
const tempCachePercent = math.E * math.Pi * math.Phi
// DefaultGCPolicy returns a default builder GC policy
func DefaultGCPolicy(p string, defaultKeepBytes int64) []client.PruneInfo {
keep := defaultKeepBytes
if defaultKeepBytes == 0 {
keep = detectDefaultGCCap(p)
}
tempCacheKeepBytes := int64(math.Round(float64(keep) / 100. * float64(tempCachePercent)))
const minTempCacheKeepBytes = 512 * 1e6 // 512MB
if tempCacheKeepBytes < minTempCacheKeepBytes {
tempCacheKeepBytes = minTempCacheKeepBytes
}
// FIXME(thaJeztah): wire up new options https://github.com/moby/moby/issues/48639
return []client.PruneInfo{
// if build cache uses more than 512MB delete the most easily reproducible data after it has not been used for 2 days
{
Filter: []string{"type==source.local,type==exec.cachemount,type==source.git.checkout"},
KeepDuration: 48 * time.Hour,
ReservedSpace: tempCacheKeepBytes,
},
// remove any data not used for 60 days
{
KeepDuration: 60 * 24 * time.Hour,
ReservedSpace: keep,
},
// keep the unshared build cache under cap
{
ReservedSpace: keep,
},
// if previous policies were insufficient start deleting internal data to keep build cache under cap
{
All: true,
ReservedSpace: keep,
},
}
}
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