This repository has been archived by the owner on Feb 24, 2020. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 887
/
image_gc.go
145 lines (129 loc) · 4.11 KB
/
image_gc.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// Copyright 2015 The rkt Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"time"
"github.com/coreos/rkt/common"
"github.com/coreos/rkt/pkg/lock"
"github.com/coreos/rkt/store"
"github.com/spf13/cobra"
)
const (
defaultImageGracePeriod = 24 * time.Hour
)
var (
cmdImageGC = &cobra.Command{
Use: "gc",
Short: "Garbage collect local store",
Run: runWrapper(runGCImage),
}
flagImageGracePeriod time.Duration
)
func init() {
cmdImage.AddCommand(cmdImageGC)
cmdImageGC.Flags().DurationVar(&flagImageGracePeriod, "grace-period", defaultImageGracePeriod, "duration to wait since an image was last used before removing it")
}
func runGCImage(cmd *cobra.Command, args []string) (exit int) {
s, err := store.NewStore(getDataDir())
if err != nil {
stderr("rkt: cannot open store: %v", err)
return 1
}
if err := gcTreeStore(s); err != nil {
stderr("rkt: failed to remove unreferenced treestores: %v", err)
return 1
}
if err := gcStore(s, flagImageGracePeriod); err != nil {
stderr("rkt: %v", err)
return 1
}
return 0
}
// gcTreeStore removes all treeStoreIDs not referenced by any non garbage
// collected pod from the store.
func gcTreeStore(s *store.Store) error {
// Take an exclusive lock to block other pods being created.
// This is needed to avoid races between the below steps (getting the
// list of referenced treeStoreIDs, getting the list of treeStoreIDs
// from the store, removal of unreferenced treeStoreIDs) and new
// pods/treeStores being created/referenced
keyLock, err := lock.ExclusiveKeyLock(lockDir(), common.PrepareLock)
if err != nil {
return fmt.Errorf("cannot get exclusive prepare lock: %v", err)
}
defer keyLock.Close()
referencedTreeStoreIDs, err := getReferencedTreeStoreIDs()
if err != nil {
return fmt.Errorf("cannot get referenced treestoreIDs: %v", err)
}
treeStoreIDs, err := s.GetTreeStoreIDs()
if err != nil {
return fmt.Errorf("cannot get treestoreIDs from the store: %v", err)
}
for _, treeStoreID := range treeStoreIDs {
if _, ok := referencedTreeStoreIDs[treeStoreID]; !ok {
if err := s.RemoveTreeStore(treeStoreID); err != nil {
stderr("rkt: error removing treestore %q: %v", treeStoreID, err)
} else {
stderr("rkt: removed treestore %q", treeStoreID)
}
}
}
return nil
}
func getReferencedTreeStoreIDs() (map[string]struct{}, error) {
treeStoreIDs := map[string]struct{}{}
var walkErr error
// Consider pods in preparing, prepared, run, exitedgarbage state
if err := walkPods(includeMostDirs, func(p *pod) {
stage1TreeStoreID, err := p.getStage1TreeStoreID()
if err != nil {
walkErr = fmt.Errorf("cannot get stage1 treestoreID for pod %s: %v", p.uuid, err)
return
}
appsTreeStoreIDs, err := p.getAppsTreeStoreIDs()
if err != nil {
walkErr = fmt.Errorf("cannot get apps treestoreIDs for pod %s: %v", p.uuid, err)
return
}
allTreeStoreIDs := append(appsTreeStoreIDs, stage1TreeStoreID)
for _, treeStoreID := range allTreeStoreIDs {
treeStoreIDs[treeStoreID] = struct{}{}
}
}); err != nil {
return nil, fmt.Errorf("failed to get pod handles: %v", err)
}
if walkErr != nil {
return nil, walkErr
}
return treeStoreIDs, nil
}
func gcStore(s *store.Store, gracePeriod time.Duration) error {
var imagesToRemove []string
aciinfos, err := s.GetAllACIInfos([]string{"lastused"}, true)
if err != nil {
return fmt.Errorf("Failed to get aciinfos: %v", err)
}
for _, ai := range aciinfos {
if time.Now().Sub(ai.LastUsed) <= gracePeriod {
break
}
imagesToRemove = append(imagesToRemove, ai.BlobKey)
}
if err := rmImages(s, imagesToRemove); err != nil {
return err
}
return nil
}