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// Package hooks implements CRI-O's hook handling.
package hooks
import (
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"strings"
old "github.com/containers/common/pkg/hooks/0.1.0"
current "github.com/containers/common/pkg/hooks/1.0.0"
"github.com/sirupsen/logrus"
)
type reader func(content []byte) (*current.Hook, error)
var (
// ErrNoJSONSuffix represents hook-add attempts where the filename
// does not end in '.json'.
ErrNoJSONSuffix = errors.New("hook filename does not end in '.json'")
// Readers registers per-version hook readers.
Readers = map[string]reader{}
)
// Read reads a hook JSON file, verifies it, and returns the hook configuration.
func Read(path string, extensionStages []string) (*current.Hook, error) {
if !strings.HasSuffix(path, ".json") {
return nil, ErrNoJSONSuffix
}
content, err := os.ReadFile(path)
if err != nil {
return nil, err
}
hook, err := read(content)
if err != nil {
return nil, fmt.Errorf("parsing hook %q: %w", path, err)
}
err = hook.Validate(extensionStages)
return hook, err
}
func read(content []byte) (hook *current.Hook, err error) {
var ver version
if err := json.Unmarshal(content, &ver); err != nil {
return nil, fmt.Errorf("version check: %w", err)
}
reader, ok := Readers[ver.Version]
if !ok {
return nil, fmt.Errorf("unrecognized hook version: %q", ver.Version)
}
hook, err = reader(content)
if err != nil {
return hook, fmt.Errorf("%s: %v", ver.Version, err)
}
return hook, err
}
// ReadDir reads hook JSON files from a directory into the given map,
// clobbering any previous entries with the same filenames.
func ReadDir(path string, extensionStages []string, hooks map[string]*current.Hook) error {
logrus.Debugf("reading hooks from %s", path)
files, err := os.ReadDir(path)
if err != nil {
return err
}
res := err
for _, file := range files {
filePath := filepath.Join(path, file.Name())
hook, err := Read(filePath, extensionStages)
if err != nil {
if err == ErrNoJSONSuffix {
continue
}
if errors.Is(err, os.ErrNotExist) {
if err2, ok := err.(*os.PathError); ok && err2.Path == filePath {
continue
}
}
if res == nil {
res = err
} else {
res = fmt.Errorf("%v: %w", err, res)
}
continue
}
hooks[file.Name()] = hook
logrus.Debugf("added hook %s", filePath)
}
return res
}
func init() {
Readers[current.Version] = current.Read
Readers[old.Version] = old.Read
Readers[""] = old.Read
}
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