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https://gitea.com/Lydanne/buildx.git
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92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
/*
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Copyright 2020 The Compose Specification Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package utils
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import (
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"os"
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"path/filepath"
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"strings"
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)
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// ResolveSymbolicLink converts the section of an absolute path if it is a
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// symbolic link
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//
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// Parameters:
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// - path: an absolute path
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//
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// Returns:
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// - converted path if it has a symbolic link or the same path if there is
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// no symbolic link
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func ResolveSymbolicLink(path string) (string, error) {
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sym, part, err := getSymbolinkLink(path)
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if err != nil {
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return "", err
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}
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if sym == "" && part == "" {
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// no symbolic link detected
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return path, nil
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}
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return strings.Replace(path, part, sym, 1), nil
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}
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// getSymbolinkLink parses all parts of the path and returns the
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// the symbolic link part as well as the correspondent original part
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// Parameters:
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// - path: an absolute path
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//
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// Returns:
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// - string section of the path that is a symbolic link
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// - string correspondent path section of the symbolic link
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// - An error
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func getSymbolinkLink(path string) (string, string, error) {
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parts := strings.Split(path, string(os.PathSeparator))
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// Reconstruct the path step by step, checking each component
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var currentPath string
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if filepath.IsAbs(path) {
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currentPath = string(os.PathSeparator)
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}
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for _, part := range parts {
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if part == "" {
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continue
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}
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currentPath = filepath.Join(currentPath, part)
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if isSymLink := isSymbolicLink(currentPath); isSymLink {
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// return symbolic link, and correspondent part
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target, err := filepath.EvalSymlinks(currentPath)
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if err != nil {
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return "", "", err
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}
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return target, currentPath, nil
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}
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}
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return "", "", nil // no symbolic link
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}
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// isSymbolicLink validates if the path is a symbolic link
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func isSymbolicLink(path string) bool {
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info, err := os.Lstat(path)
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if err != nil {
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return false
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}
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// Check if the file mode indicates a symbolic link
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return info.Mode()&os.ModeSymlink != 0
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}
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