mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
62 lines
2.1 KiB
Go
62 lines
2.1 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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"os/exec"
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log "github.com/sirupsen/logrus"
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)
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// NewLowLevelRuntime creates a Runtime that wraps a low-level runtime executable.
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// The executable specified is taken from the list of supplied candidates, with the first match
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// present in the PATH being selected.
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func NewLowLevelRuntime(candidates ...string) (Runtime, error) {
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return NewLowLevelRuntimeWithLogger(log.StandardLogger(), candidates...)
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}
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// NewLowLevelRuntimeWithLogger creates a Runtime as with NewLowLevelRuntime using the specified logger.
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func NewLowLevelRuntimeWithLogger(logger *log.Logger, candidates ...string) (Runtime, error) {
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runtimePath, err := findRuntime(logger, candidates)
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if err != nil {
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return nil, fmt.Errorf("error locating runtime: %v", err)
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}
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return NewRuntimeForPathWithLogger(logger, runtimePath)
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}
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// findRuntime checks elements in a list of supplied candidates for a matching executable in the PATH.
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// The absolute path to the first match is returned.
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func findRuntime(logger *log.Logger, candidates []string) (string, error) {
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if len(candidates) == 0 {
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return "", fmt.Errorf("at least one runtime candidate must be specified")
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}
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for _, candidate := range candidates {
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logger.Infof("Looking for runtime binary '%v'", candidate)
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runcPath, err := exec.LookPath(candidate)
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if err == nil {
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logger.Infof("Found runtime binary '%v'", runcPath)
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return runcPath, nil
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}
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logger.Warnf("Runtime binary '%v' not found: %v", candidate, err)
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}
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return "", fmt.Errorf("no runtime binary found from candidate list: %v", candidates)
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}
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