k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/pkg/kubelet/util/util_windows.go (about) 1 //go:build windows 2 // +build windows 3 4 /* 5 Copyright 2017 The Kubernetes Authors. 6 7 Licensed under the Apache License, Version 2.0 (the "License"); 8 you may not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 http://www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an "AS IS" BASIS, 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 */ 19 20 package util 21 22 import ( 23 "fmt" 24 "path/filepath" 25 "strings" 26 "syscall" 27 "time" 28 ) 29 30 const npipeProtocol = "npipe" 31 32 // LocalEndpoint returns the full path to a named pipe at the given endpoint - unlike on unix, we can't use sockets. 33 func LocalEndpoint(path, file string) (string, error) { 34 // extract the podresources config name from the path. We only need this on windows because the preferred layout of pipes, 35 // this is why we have the extra logic in here instead of changing the function signature. Join the file to make sure the 36 // last path component is a file, so the operation chain works.. 37 podResourcesDir := filepath.Base(filepath.Dir(filepath.Join(path, file))) 38 if podResourcesDir == "" { 39 // should not happen because the user can configure a root directory, and we expected a subdirectory inside 40 // the user supplied root directory named like "pod-resources" or so. 41 return "", fmt.Errorf("cannot infer the podresources directory from path %q", path) 42 } 43 // windows pipes are expected to use forward slashes: https://learn.microsoft.com/windows/win32/ipc/pipe-names 44 // so using `url` like we do on unix gives us unclear benefits - see https://github.com/kubernetes/kubernetes/issues/78628 45 // So we just construct the path from scratch. 46 // Format: \\ServerName\pipe\PipeName 47 // Where where ServerName is either the name of a remote computer or a period, to specify the local computer. 48 // We only consider PipeName as regular windows path, while the pipe path components are fixed, hence we use constants. 49 serverPart := `\\.` 50 pipePart := "pipe" 51 pipeName := "kubelet-" + podResourcesDir 52 return npipeProtocol + "://" + filepath.Join(serverPart, pipePart, pipeName), nil 53 } 54 55 var tickCount = syscall.NewLazyDLL("kernel32.dll").NewProc("GetTickCount64") 56 57 // GetBootTime returns the time at which the machine was started, truncated to the nearest second 58 func GetBootTime() (time.Time, error) { 59 currentTime := time.Now() 60 output, _, err := tickCount.Call() 61 if errno, ok := err.(syscall.Errno); !ok || errno != 0 { 62 return time.Time{}, err 63 } 64 return currentTime.Add(-time.Duration(output) * time.Millisecond).Truncate(time.Second), nil 65 } 66 67 // NormalizePath converts FS paths returned by certain go frameworks (like fsnotify) 68 // to native Windows paths that can be passed to Windows specific code 69 func NormalizePath(path string) string { 70 path = strings.ReplaceAll(path, "/", "\\") 71 if strings.HasPrefix(path, "\\") { 72 path = "c:" + path 73 } 74 return path 75 }