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[#292] pruning: last_n: use snap name as fallback when creation is equal

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This commit is contained in:
Christian Schwarz 2020-08-29 17:44:17 +02:00
parent 91e310b7e3
commit 639359f393
1 changed files with 8 additions and 1 deletions
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9
pruning/keep_last_n.go
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@ -2,6 +2,7 @@ package pruning
import (
"sort"
"strings"
"github.com/pkg/errors"
)
@ -26,7 +27,13 @@ func (k KeepLastN) KeepRule(snaps []Snapshot) (destroyList []Snapshot) {
res := shallowCopySnapList(snaps)
sort.Slice(res, func(i, j int) bool {
return res[i].Date().After(res[j].Date())
// by date (youngest first)
id, jd := res[i].Date(), res[j].Date()
if !id.Equal(jd) {
return id.After(jd)
}
// then lexicographically descending (e.g. b, a)
return strings.Compare(res[i].Name(), res[j].Name()) == 1
})
return res[k.n:]