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
|
package libkpod
import (
"encoding/json"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
"syscall"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// DefaultHooksDirPath Default directory containing hooks config files
DefaultHooksDirPath = "/usr/share/containers/oci/hooks.d"
// OverrideHooksDirPath Directory where admin can override the default configuration
OverrideHooksDirPath = "/etc/containers/oci/hooks.d"
)
// HookParams is the structure returned from read the hooks configuration
type HookParams struct {
Hook string `json:"hook"`
Stage []string `json:"stage"`
Cmds []string `json:"cmd"`
Annotations []string `json:"annotation"`
HasBindMounts bool `json:"hasbindmounts"`
}
// readHook reads hooks json files, verifies it and returns the json config
func readHook(hookPath string) (HookParams, error) {
var hook HookParams
raw, err := ioutil.ReadFile(hookPath)
if err != nil {
return hook, errors.Wrapf(err, "error Reading hook %q", hookPath)
}
if err := json.Unmarshal(raw, &hook); err != nil {
return hook, errors.Wrapf(err, "error Unmarshalling JSON for %q", hookPath)
}
if _, err := os.Stat(hook.Hook); err != nil {
return hook, errors.Wrapf(err, "unable to stat hook %q in hook config %q", hook.Hook, hookPath)
}
validStage := map[string]bool{"prestart": true, "poststart": true, "poststop": true}
for _, cmd := range hook.Cmds {
if _, err = regexp.Compile(cmd); err != nil {
return hook, errors.Wrapf(err, "invalid cmd regular expression %q defined in hook config %q", cmd, hookPath)
}
}
for _, cmd := range hook.Annotations {
if _, err = regexp.Compile(cmd); err != nil {
return hook, errors.Wrapf(err, "invalid cmd regular expression %q defined in hook config %q", cmd, hookPath)
}
}
for _, stage := range hook.Stage {
if !validStage[stage] {
return hook, errors.Wrapf(err, "unknown stage %q defined in hook config %q", stage, hookPath)
}
}
return hook, nil
}
// readHooks reads hooks json files in directory to setup OCI Hooks
// adding hooks to the passedin hooks map.
func readHooks(hooksPath string, hooks map[string]HookParams) error {
if _, err := os.Stat(hooksPath); err != nil {
if os.IsNotExist(err) {
logrus.Warnf("hooks path: %q does not exist", hooksPath)
return nil
}
return errors.Wrapf(err, "unable to stat hooks path %q", hooksPath)
}
files, err := ioutil.ReadDir(hooksPath)
if err != nil {
return err
}
for _, file := range files {
if !strings.HasSuffix(file.Name(), ".json") {
continue
}
hook, err := readHook(filepath.Join(hooksPath, file.Name()))
if err != nil {
return err
}
for key, h := range hooks {
// hook.Hook can only be defined in one hook file, unless it has the
// same name in the override path.
if hook.Hook == h.Hook && key != file.Name() {
return errors.Wrapf(syscall.EINVAL, "duplicate path, hook %q from %q already defined in %q", hook.Hook, hooksPath, key)
}
}
hooks[file.Name()] = hook
}
return nil
}
|
