mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-25 21:39:10 +00:00
138 lines
3.3 KiB
Go
138 lines
3.3 KiB
Go
/**
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# Copyright (c) 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 spec
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"tags.cncf.io/container-device-interface/pkg/cdi"
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"tags.cncf.io/container-device-interface/specs-go"
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"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/transform"
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)
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type spec struct {
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*specs.Spec
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format string
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permissions os.FileMode
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transformOnSave transform.Transformer
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}
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var _ Interface = (*spec)(nil)
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// New creates a new spec with the specified options.
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func New(opts ...Option) (Interface, error) {
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return newBuilder(opts...).Build()
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}
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// Save writes the spec to the specified path and overwrites the file if it exists.
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func (s *spec) Save(path string) error {
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if s.transformOnSave != nil {
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err := s.transformOnSave.Transform(s.Raw())
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if err != nil {
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return fmt.Errorf("error applying transform: %w", err)
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}
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}
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path, err := s.normalizePath(path)
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if err != nil {
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return fmt.Errorf("failed to normalize path: %w", err)
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}
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specDir := filepath.Dir(path)
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cache, _ := cdi.NewCache(
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cdi.WithAutoRefresh(false),
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cdi.WithSpecDirs(specDir),
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)
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if err := cache.WriteSpec(s.Raw(), filepath.Base(path)); err != nil {
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return fmt.Errorf("failed to write spec: %w", err)
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}
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if err := os.Chmod(path, s.permissions); err != nil {
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return fmt.Errorf("failed to set permissions on spec file: %w", err)
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}
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return nil
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}
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// WriteTo writes the spec to the specified writer.
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func (s *spec) WriteTo(w io.Writer) (int64, error) {
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name, err := cdi.GenerateNameForSpec(s.Raw())
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if err != nil {
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return 0, err
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}
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path, _ := s.normalizePath(name)
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tmpFile, err := os.CreateTemp("", "*"+filepath.Base(path))
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if err != nil {
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return 0, err
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}
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defer os.Remove(tmpFile.Name())
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if err := s.Save(tmpFile.Name()); err != nil {
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return 0, err
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}
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err = tmpFile.Close()
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if err != nil {
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return 0, fmt.Errorf("failed to close temporary file: %w", err)
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}
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r, err := os.Open(tmpFile.Name())
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if err != nil {
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return 0, fmt.Errorf("failed to open temporary file: %w", err)
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}
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defer r.Close()
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return io.Copy(w, r)
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}
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// Raw returns a pointer to the raw spec.
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func (s *spec) Raw() *specs.Spec {
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return s.Spec
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}
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// normalizePath ensures that the specified path has a supported extension
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func (s *spec) normalizePath(path string) (string, error) {
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if ext := filepath.Ext(path); ext != ".yaml" && ext != ".json" {
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path += s.extension()
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}
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if filepath.Clean(filepath.Dir(path)) == "." {
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pwd, err := os.Getwd()
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if err != nil {
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return path, fmt.Errorf("failed to get current working directory: %v", err)
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}
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path = filepath.Join(pwd, path)
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}
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return path, nil
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}
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func (s *spec) extension() string {
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switch s.format {
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case FormatJSON:
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return ".json"
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case FormatYAML:
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return ".yaml"
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}
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return ".yaml"
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}
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