mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
116 lines
2.9 KiB
Go
116 lines
2.9 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 oci
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import (
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"fmt"
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"path/filepath"
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"strings"
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)
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const (
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specFileName = "config.json"
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)
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// GetBundleDir returns the bundle directory or default depending on the
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// supplied command line arguments.
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func GetBundleDir(args []string) (string, error) {
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bundleDir, err := GetBundleDirFromArgs(args)
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if err != nil {
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return "", fmt.Errorf("error getting bundle dir from args: %v", err)
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}
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return bundleDir, nil
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}
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// GetBundleDirFromArgs 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 GetBundleDirFromArgs(args []string) (string, error) {
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var bundleDir string
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for i := 0; i < len(args); i++ {
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param := args[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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bundleDir = 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(args) {
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bundleDir = args[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 args
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return "", fmt.Errorf("bundle option requires an argument")
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}
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return bundleDir, nil
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}
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// GetSpecFilePath returns the expected path to the OCI specification file for the given
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// bundle directory.
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func GetSpecFilePath(bundleDir string) string {
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specFilePath := filepath.Join(bundleDir, specFileName)
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return specFilePath
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}
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// IsBundleFlag is a helper function that checks wither the specified argument represents
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// a bundle flag (--bundle or -b)
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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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// HasCreateSubcommand checks the supplied arguments for a 'create' subcommand
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func HasCreateSubcommand(args []string) bool {
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var previousWasBundle bool
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for _, a := range args {
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// We check for '--bundle create' explicitly to ensure that we
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// don't inadvertently trigger a modification if the bundle directory
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// is specified as `create`
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if !previousWasBundle && IsBundleFlag(a) {
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previousWasBundle = true
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continue
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}
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if !previousWasBundle && a == "create" {
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return true
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}
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previousWasBundle = false
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}
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return false
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}
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