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82 lines
2.3 KiB
82 lines
2.3 KiB
// 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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)
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// The OSDetector interface defines a way to detect an Operating System and
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// its version from input data
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type OSDetector interface {
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// Detect detects an Operating System and its version from input data
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Detect(map[string][]byte) (string, string)
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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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osDetectorsLock sync.Mutex
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osDetectors = make(map[string]OSDetector)
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)
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// RegisterOSDetector provides a way to dynamically register an implementation of a
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// OSDetector.
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//
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// If RegisterOSDetector is called twice with the same name if OSDetector is nil,
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// or if the name is blank, it panics.
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func RegisterOSDetector(name string, f OSDetector) {
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if name == "" {
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panic("Could not register a OSDetector 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 OSDetector")
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}
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osDetectorsLock.Lock()
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defer osDetectorsLock.Unlock()
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if _, alreadyExists := osDetectors[name]; alreadyExists {
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panic(fmt.Sprintf("Detector '%s' is already registered", name))
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}
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osDetectors[name] = f
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}
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// DetectOS finds the OS of the layer by using every registered OSDetector
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func DetectOS(data map[string][]byte) string {
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for _, detector := range osDetectors {
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OS, version := detector.Detect(data)
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if OS != "" && version != "" {
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return OS + ":" + version
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}
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}
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return ""
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}
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// GetRequiredFilesOS returns the list of files required for Detect for every
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// registered OSDetector, without leading /
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func GetRequiredFilesOS() (files []string) {
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for _, detector := range osDetectors {
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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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