mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-25 21:39:10 +00:00
395f6cecb2
This change adds a GetContainerRoot to the oci.State type to encapsulate the logic around determining the container root. This Fixes a bug where relative roots (e.g. as generated by contianerd) are not supported. Signed-off-by: Evan Lezar <elezar@nvidia.com>
94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
/**
|
|
# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
**/
|
|
|
|
package oci
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/opencontainers/runtime-spec/specs-go"
|
|
)
|
|
|
|
// State stores an OCI container state. This includes the spec path and the environment
|
|
type State specs.State
|
|
|
|
// LoadContainerState loads the container state from the specified filename. If the filename is empty or '-' the state is loaded from STDIN
|
|
func LoadContainerState(filename string) (*State, error) {
|
|
if filename == "" || filename == "-" {
|
|
return ReadContainerState(os.Stdin)
|
|
}
|
|
|
|
inputFile, err := os.Open(filename)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open file: %v", err)
|
|
}
|
|
defer inputFile.Close()
|
|
|
|
return ReadContainerState(inputFile)
|
|
}
|
|
|
|
// ReadContainerState reads the container state from the specified reader
|
|
func ReadContainerState(reader io.Reader) (*State, error) {
|
|
var s State
|
|
|
|
d := json.NewDecoder(reader)
|
|
if err := d.Decode(&s); err != nil {
|
|
return nil, fmt.Errorf("failed to decode container state: %v", err)
|
|
}
|
|
|
|
return &s, nil
|
|
}
|
|
|
|
// LoadSpec loads the OCI spec associated with the container state
|
|
func (s *State) LoadSpec() (*specs.Spec, error) {
|
|
specFilePath := GetSpecFilePath(s.Bundle)
|
|
specFile, err := os.Open(specFilePath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open OCI spec file: %v", err)
|
|
}
|
|
defer specFile.Close()
|
|
|
|
spec, err := LoadFrom(specFile)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to load OCI spec: %v", err)
|
|
}
|
|
return spec, nil
|
|
}
|
|
|
|
// GetContainerRoot returns the root for the container from the associated spec. If the spec is not yet loaded, it is
|
|
// loaded and cached.
|
|
func (s *State) GetContainerRoot() (string, error) {
|
|
spec, err := s.LoadSpec()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
var containerRoot string
|
|
if spec.Root != nil {
|
|
containerRoot = spec.Root.Path
|
|
}
|
|
|
|
if filepath.IsAbs(containerRoot) {
|
|
return containerRoot, nil
|
|
}
|
|
|
|
return filepath.Join(s.Bundle, containerRoot), nil
|
|
}
|