mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-25 05:21:33 +00:00
94 lines
2.3 KiB
Go
94 lines
2.3 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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"strings"
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log "github.com/sirupsen/logrus"
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)
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const (
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envPath = "PATH"
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)
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var defaultPaths = []string{"/usr/local/sbin", "/usr/local/bin", "/usr/sbin", "/usr/bin", "/sbin", "/bin"}
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type executable struct {
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file
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}
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// NewExecutableLocator creates a locator to fine executable files in the path. A logger can also be specified.
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func NewExecutableLocator(logger *log.Logger, root string) Locator {
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pathEnv := os.Getenv(envPath)
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paths := filepath.SplitList(pathEnv)
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if root != "" {
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paths = append(paths, defaultPaths...)
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}
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var prefixes []string
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for _, dir := range paths {
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prefixes = append(prefixes, filepath.Join(root, dir))
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}
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l := executable{
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file: file{
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logger: logger,
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prefixes: prefixes,
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filter: assertExecutable,
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},
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}
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return &l
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}
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var _ Locator = (*executable)(nil)
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// Locate finds executable files in the path. If a relative or absolute path is specified, the prefix paths are not considered.
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func (p executable) Locate(filename string) ([]string, error) {
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// For absolute paths we ensure that it is executable
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if strings.Contains(filename, "/") {
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err := assertExecutable(filename)
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if err != nil {
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return nil, fmt.Errorf("absolute path %v is not an executable file: %v", filename, err)
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}
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return []string{filename}, nil
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}
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return p.file.Locate(filename)
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}
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// assertExecutable checks whether the specified path is an execuable file.
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func assertExecutable(filename string) error {
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err := assertFile(filename)
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if err != nil {
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return err
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}
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info, err := os.Stat(filename)
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if err != nil {
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return err
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}
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if info.Mode()&0111 == 0 {
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return fmt.Errorf("specified file '%v' is not executable", filename)
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}
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return nil
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}
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