mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
86 lines
2.3 KiB
Go
86 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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log "github.com/sirupsen/logrus"
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)
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// file can be used to locate file (or file-like elements) at a specified set of
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// prefixes. The validity of a file is determined by a filter function.
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type file struct {
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logger *log.Logger
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prefixes []string
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filter func(string) error
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}
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// NewFileLocator creates a Locator that can be used to find files at the specified root. A logger
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// can also be specified.
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func NewFileLocator(logger *log.Logger, root string) Locator {
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l := newFileLocator(logger, root)
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return &l
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}
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func newFileLocator(logger *log.Logger, root string) file {
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return file{
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logger: logger,
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prefixes: []string{root},
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filter: assertFile,
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}
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}
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var _ Locator = (*file)(nil)
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// Locate attempts to find the specified file. All prefixes are searched and any matching
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// candidates are returned. If no matches are found, an error is returned.
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func (p file) Locate(filename string) ([]string, error) {
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var filenames []string
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for _, prefix := range p.prefixes {
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candidate := filepath.Join(prefix, filename)
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p.logger.Debugf("Checking candidate '%v'", candidate)
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err := p.filter(candidate)
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if err != nil {
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p.logger.Debugf("Candidate '%v' does not meet requirements: %v", candidate, err)
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continue
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}
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filenames = append(filenames, candidate)
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}
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if len(filename) == 0 {
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return nil, fmt.Errorf("file %v not found", filename)
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}
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return filenames, nil
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}
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// assertFile checks whether the specified path is a regular file
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func assertFile(filename string) error {
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info, err := os.Stat(filename)
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if err != nil {
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return fmt.Errorf("error getting info for %v: %v", filename, err)
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}
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if info.IsDir() {
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return fmt.Errorf("specified path '%v' is a directory", filename)
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}
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return nil
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}
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