mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-23 00:38:26 +00:00
125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
/**
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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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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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**/
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package lookup
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/sirupsen/logrus"
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)
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type symlinkChain struct {
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file
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}
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type symlink struct {
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file
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}
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// NewSymlinkChainLocator creats a locator that can be used for locating files through symlinks.
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// A logger can also be specified.
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func NewSymlinkChainLocator(logger *logrus.Logger, root string) Locator {
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l := symlinkChain{
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file: newFileLocator(logger, root),
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}
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return &l
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}
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// NewSymlinkLocator creats a locator that can be used for locating files through symlinks.
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// A logger can also be specified.
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func NewSymlinkLocator(logger *logrus.Logger, root string) Locator {
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l := symlink{
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file: newFileLocator(logger, root),
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}
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return &l
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}
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// Locate finds the specified pattern at the specified root.
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// If the file is a symlink, the link is followed and all candidates to the final target are returned.
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func (p symlinkChain) Locate(pattern string) ([]string, error) {
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candidates, err := p.file.Locate(pattern)
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if err != nil {
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return nil, err
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}
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if len(candidates) == 0 {
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return candidates, nil
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}
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found := make(map[string]bool)
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for len(candidates) > 0 {
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candidate := candidates[0]
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candidates = candidates[:len(candidates)-1]
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if found[candidate] {
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continue
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}
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found[candidate] = true
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info, err := os.Lstat(candidate)
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if err != nil {
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return nil, fmt.Errorf("failed to get file info: %v", info)
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}
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if info.Mode()&os.ModeSymlink == 0 {
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continue
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}
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target, err := os.Readlink(candidate)
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if err != nil {
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return nil, fmt.Errorf("error checking symlink: %v", err)
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}
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if !filepath.IsAbs(target) {
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target, err = filepath.Abs(filepath.Join(filepath.Dir(candidate), target))
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if err != nil {
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return nil, fmt.Errorf("failed to construct absolute path: %v", err)
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}
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}
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p.logger.Debugf("Resolved link: '%v' => '%v'", candidate, target)
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if !found[target] {
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candidates = append(candidates, target)
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}
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}
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var filenames []string
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for f := range found {
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filenames = append(filenames, f)
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}
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return filenames, nil
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}
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// Locate finds the specified pattern at the specified root.
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// If the file is a symlink, the link is resolved and the target returned.
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func (p symlink) Locate(pattern string) ([]string, error) {
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candidates, err := p.file.Locate(pattern)
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if err != nil {
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return nil, err
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}
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if len(candidates) != 1 {
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return nil, fmt.Errorf("failed to uniquely resolve symlink %v: %v", pattern, candidates)
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}
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target, err := filepath.EvalSymlinks(candidates[0])
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if err != nil {
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return nil, fmt.Errorf("failed to resolve link: %v", err)
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}
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return []string{target}, err
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}
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