mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-25 21:39:10 +00:00
78 lines
2.4 KiB
Go
78 lines
2.4 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 modifier
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import (
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
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"github.com/opencontainers/runtime-spec/specs-go"
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"github.com/sirupsen/logrus"
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)
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// NewStableRuntimeModifier creates an OCI spec modifier that inserts the NVIDIA Container Runtime Hook into an OCI
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// spec. The specified logger is used to capture log output.
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func NewStableRuntimeModifier(logger *logrus.Logger) oci.SpecModifier {
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m := stableRuntimeModifier{logger: logger}
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return &m
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}
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// stableRuntimeModifier modifies an OCI spec inplace, inserting the nvidia-container-runtime-hook as a
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// prestart hook. If the hook is already present, no modification is made.
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type stableRuntimeModifier struct {
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logger *logrus.Logger
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}
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// Modify applies the required modification to the incoming OCI spec, inserting the nvidia-container-runtime-hook
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// as a prestart hook.
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func (m stableRuntimeModifier) Modify(spec *specs.Spec) error {
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path, err := exec.LookPath(config.NVIDIAContainerRuntimeHookExecutable)
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if err != nil {
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path = filepath.Join(config.DefaultExecutableDir, config.NVIDIAContainerRuntimeHookExecutable)
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_, err = os.Stat(path)
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if err != nil {
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return err
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}
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}
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m.logger.Infof("Using prestart hook path: %s", path)
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args := []string{path}
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if spec.Hooks == nil {
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spec.Hooks = &specs.Hooks{}
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} else if len(spec.Hooks.Prestart) != 0 {
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for _, hook := range spec.Hooks.Prestart {
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if strings.Contains(hook.Path, config.NVIDIAContainerRuntimeHookExecutable) {
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m.logger.Infof("existing nvidia prestart hook found in OCI spec")
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return nil
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}
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}
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}
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spec.Hooks.Prestart = append(spec.Hooks.Prestart, specs.Hook{
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Path: path,
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Args: append(args, "prestart"),
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})
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return nil
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}
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