You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
2.8 KiB
87 lines
2.8 KiB
// Copyright 2015 clair 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 detectors exposes functions to register and use container
|
|
// information extractors.
|
|
package detectors
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
|
|
"github.com/coreos/clair/database"
|
|
"github.com/coreos/pkg/capnslog"
|
|
)
|
|
|
|
// The NamespaceDetector interface defines a way to detect a Namespace from input data.
|
|
// A namespace is usually made of an Operating System name and its version.
|
|
type NamespaceDetector interface {
|
|
// Detect detects a Namespace and its version from input data.
|
|
Detect(map[string][]byte) *database.Namespace
|
|
// GetRequiredFiles returns the list of files required for Detect, without
|
|
// leading /.
|
|
GetRequiredFiles() []string
|
|
}
|
|
|
|
var (
|
|
nlog = capnslog.NewPackageLogger("github.com/coreos/clair", "worker/detectors")
|
|
|
|
namespaceDetectorsLock sync.Mutex
|
|
namespaceDetectors = make(map[string]NamespaceDetector)
|
|
)
|
|
|
|
// RegisterNamespaceDetector provides a way to dynamically register an implementation of a
|
|
// NamespaceDetector.
|
|
//
|
|
// If RegisterNamespaceDetector is called twice with the same name if NamespaceDetector is nil,
|
|
// or if the name is blank, it panics.
|
|
func RegisterNamespaceDetector(name string, f NamespaceDetector) {
|
|
if name == "" {
|
|
panic("Could not register a NamespaceDetector with an empty name")
|
|
}
|
|
if f == nil {
|
|
panic("Could not register a nil NamespaceDetector")
|
|
}
|
|
|
|
namespaceDetectorsLock.Lock()
|
|
defer namespaceDetectorsLock.Unlock()
|
|
|
|
if _, alreadyExists := namespaceDetectors[name]; alreadyExists {
|
|
panic(fmt.Sprintf("Detector '%s' is already registered", name))
|
|
}
|
|
namespaceDetectors[name] = f
|
|
}
|
|
|
|
// DetectNamespace finds the OS of the layer by using every registered NamespaceDetector.
|
|
func DetectNamespace(data map[string][]byte) *database.Namespace {
|
|
for name, detector := range namespaceDetectors {
|
|
if namespace := detector.Detect(data); namespace != nil {
|
|
nlog.Debugf("detector: %q; namespace: %q\n", name, namespace.Name)
|
|
return namespace
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetRequiredFilesNamespace returns the list of files required for DetectNamespace for every
|
|
// registered NamespaceDetector, without leading /.
|
|
func GetRequiredFilesNamespace() (files []string) {
|
|
for _, detector := range namespaceDetectors {
|
|
files = append(files, detector.GetRequiredFiles()...)
|
|
}
|
|
|
|
return
|
|
}
|