83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
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// Copyright 2015 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package detectors exposes functions to register and use container
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// information extractors.
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package detectors
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import (
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"fmt"
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"sync"
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"github.com/coreos/clair/database"
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)
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// The NamespaceDetector interface defines a way to detect a Namespace from input data.
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// A namespace is usually made of an Operating System name and its version.
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type NamespaceDetector interface {
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// Detect detects a Namespace and its version from input data.
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Detect(map[string][]byte) *database.Namespace
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// GetRequiredFiles returns the list of files required for Detect, without
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// leading /.
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GetRequiredFiles() []string
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}
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var (
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namespaceDetectorsLock sync.Mutex
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namespaceDetectors = make(map[string]NamespaceDetector)
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)
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// RegisterNamespaceDetector provides a way to dynamically register an implementation of a
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// NamespaceDetector.
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//
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// If RegisterNamespaceDetector is called twice with the same name if NamespaceDetector is nil,
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// or if the name is blank, it panics.
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func RegisterNamespaceDetector(name string, f NamespaceDetector) {
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if name == "" {
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panic("Could not register a NamespaceDetector with an empty name")
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}
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if f == nil {
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panic("Could not register a nil NamespaceDetector")
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}
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namespaceDetectorsLock.Lock()
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defer namespaceDetectorsLock.Unlock()
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if _, alreadyExists := namespaceDetectors[name]; alreadyExists {
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panic(fmt.Sprintf("Detector '%s' is already registered", name))
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}
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namespaceDetectors[name] = f
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}
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// DetectNamespace finds the OS of the layer by using every registered NamespaceDetector.
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func DetectNamespace(data map[string][]byte) *database.Namespace {
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for _, detector := range namespaceDetectors {
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if namespace := detector.Detect(data); namespace != nil {
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return namespace
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}
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}
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return nil
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}
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// GetRequiredFilesNamespace returns the list of files required for DetectNamespace for every
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// registered NamespaceDetector, without leading /.
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func GetRequiredFilesNamespace() (files []string) {
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for _, detector := range namespaceDetectors {
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files = append(files, detector.GetRequiredFiles()...)
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}
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return
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}
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