mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 08:18:32 +00:00
4177fddcc4
This change imports the modifying runtime abstraction from the experimental branch. This encapsulates the checks for whether modification is required, and forwards the loaded spec to the specified modifier. This allows for the same code to be reused when performing more complex modifications. Signed-off-by: Evan Lezar <elezar@nvidia.com>
57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
/*
|
|
# Copyright (c) 2021, 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 (
|
|
"fmt"
|
|
"os/exec"
|
|
|
|
log "github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// NewLowLevelRuntime creates a Runtime that wraps a low-level runtime executable.
|
|
// The executable specified is taken from the list of supplied candidates, with the first match
|
|
// present in the PATH being selected. A logger is also specified.
|
|
func NewLowLevelRuntime(logger *log.Logger, candidates []string) (Runtime, error) {
|
|
runtimePath, err := findRuntime(logger, candidates)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error locating runtime: %v", err)
|
|
}
|
|
|
|
return NewRuntimeForPath(logger, runtimePath)
|
|
}
|
|
|
|
// findRuntime checks elements in a list of supplied candidates for a matching executable in the PATH.
|
|
// The absolute path to the first match is returned.
|
|
func findRuntime(logger *log.Logger, candidates []string) (string, error) {
|
|
if len(candidates) == 0 {
|
|
return "", fmt.Errorf("at least one runtime candidate must be specified")
|
|
}
|
|
|
|
for _, candidate := range candidates {
|
|
logger.Infof("Looking for runtime binary '%v'", candidate)
|
|
runcPath, err := exec.LookPath(candidate)
|
|
if err == nil {
|
|
logger.Infof("Found runtime binary '%v'", runcPath)
|
|
return runcPath, nil
|
|
}
|
|
logger.Warnf("Runtime binary '%v' not found: %v", candidate, err)
|
|
}
|
|
|
|
return "", fmt.Errorf("no runtime binary found from candidate list: %v", candidates)
|
|
}
|