mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
145 lines
3.8 KiB
Go
145 lines
3.8 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 main
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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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"github.com/NVIDIA/nvidia-container-toolkit/pkg/oci"
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)
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const (
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ociSpecFileName = "config.json"
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dockerRuncExecutableName = "docker-runc"
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runcExecutableName = "runc"
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)
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// newRuntime is a factory method that constructs a runtime based on the selected configuration.
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func newRuntime(argv []string) (oci.Runtime, error) {
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ociSpec, err := newOCISpec(argv)
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if err != nil {
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return nil, fmt.Errorf("error constructing OCI specification: %v", err)
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}
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runc, err := newRuncRuntime()
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if err != nil {
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return nil, fmt.Errorf("error constructing runc runtime: %v", err)
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}
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r, err := newNvidiaContainerRuntimeWithLogger(logger.Logger, runc, ociSpec)
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if err != nil {
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return nil, fmt.Errorf("error constructing NVIDIA Container Runtime: %v", err)
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}
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return r, nil
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}
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// newOCISpec constructs an OCI spec for the provided arguments
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func newOCISpec(argv []string) (oci.Spec, error) {
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bundlePath, err := getBundlePath(argv)
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if err != nil {
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return nil, fmt.Errorf("error parsing command line arguments: %v", err)
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}
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ociSpecPath, err := getOCISpecFilePath(bundlePath)
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if err != nil {
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return nil, fmt.Errorf("error getting OCI specification file path: %v", err)
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}
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ociSpec := oci.NewSpecFromFile(ociSpecPath)
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return ociSpec, nil
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}
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// newRuncRuntime locates the runc binary and wraps it in a SyscallExecRuntime
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func newRuncRuntime() (oci.Runtime, error) {
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return oci.NewLowLevelRuntimeWithLogger(
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logger.Logger,
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dockerRuncExecutableName,
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runcExecutableName,
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)
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}
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// getBundlePath checks the specified slice of strings (argv) for a 'bundle' flag as allowed by runc.
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// The following are supported:
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// --bundle{{SEP}}BUNDLE_PATH
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// -bundle{{SEP}}BUNDLE_PATH
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// -b{{SEP}}BUNDLE_PATH
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// where {{SEP}} is either ' ' or '='
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func getBundlePath(argv []string) (string, error) {
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var bundlePath string
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for i := 0; i < len(argv); i++ {
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param := argv[i]
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parts := strings.SplitN(param, "=", 2)
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if !isBundleFlag(parts[0]) {
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continue
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}
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// The flag has the format --bundle=/path
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if len(parts) == 2 {
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bundlePath = parts[1]
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continue
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}
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// The flag has the format --bundle /path
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if i+1 < len(argv) {
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bundlePath = argv[i+1]
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i++
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continue
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}
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// --bundle / -b was the last element of argv
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return "", fmt.Errorf("bundle option requires an argument")
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}
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return bundlePath, nil
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}
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func isBundleFlag(arg string) bool {
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if !strings.HasPrefix(arg, "-") {
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return false
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}
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trimmed := strings.TrimLeft(arg, "-")
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return trimmed == "b" || trimmed == "bundle"
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}
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// getOCISpecFilePath returns the expected path to the OCI specification file for the given
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// bundle directory or the current working directory if not specified.
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func getOCISpecFilePath(bundleDir string) (string, error) {
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if bundleDir == "" {
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logger.Infof("Bundle directory path is empty, using working directory.")
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workingDirectory, err := os.Getwd()
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if err != nil {
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return "", fmt.Errorf("error getting working directory: %v", err)
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}
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bundleDir = workingDirectory
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}
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logger.Infof("Using bundle directory: %v", bundleDir)
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OCISpecFilePath := filepath.Join(bundleDir, ociSpecFileName)
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logger.Infof("Using OCI specification file path: %v", OCISpecFilePath)
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return OCISpecFilePath, nil
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}
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