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mount_others.go
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mount_others.go
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// Copyright 2021 iLogtail 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.
//go:build !windows
// +build !windows
package helper
import (
"io/fs"
"os"
"strings"
)
var DefaultLogtailMountPath string
func GetMountedFilePath(logPath string) string {
return GetMountedFilePathWithBasePath(DefaultLogtailMountPath, logPath)
}
func GetMountedFilePathWithBasePath(basePath, logPath string) string {
return basePath + logPath
}
func TryGetRealPath(path string) (string, fs.FileInfo) {
sepLen := len(string(os.PathSeparator))
index := 0 // assume path is absolute
for i := 0; i < 10; i++ {
if f, err := os.Stat(path); err == nil {
return path, f
}
for {
j := strings.IndexRune(path[index+sepLen:], os.PathSeparator)
if j == -1 {
index = len(path)
} else {
index += j + sepLen
}
f, err := os.Lstat(path[:index])
if err != nil {
return "", nil
}
if f.Mode()&os.ModeSymlink != 0 {
// path[:index] is a symlink
target, _ := os.Readlink(path[:index])
partialPath := GetMountedFilePath(target)
path = partialPath + path[index:]
if _, err := os.Stat(partialPath); err != nil {
// path referenced by partialPath does not exist or has symlink
index = 0
} else {
index = len(partialPath)
}
break
}
}
}
return "", nil
}
func init() {
defaultPath := "/logtail_host"
_, err := os.Stat(defaultPath)
// only change default mount path when `/logtail_host` path exists.
if err == nil {
DefaultLogtailMountPath = defaultPath
}
}