100 lines
3.0 KiB
Go
100 lines
3.0 KiB
Go
package lib
|
|
|
|
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"`
|
|
Arguments []string `json:"arguments"`
|
|
}
|
|
|
|
// 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
|
|
}
|