mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-26 22:09:35 +00:00
239b6d3739
This change enables the experimental mode of the NVIDIA Container Runtime. If enabled, the nvidia-container-runtime.discover-mode config option is queried to determine how required OCI spec modifications should be defined. If "legacy" is selected, the existing NVIDIA Container Runtime hooks is discovered and injected into the OCI spec. Signed-off-by: Evan Lezar <elezar@nvidia.com>
83 lines
2.5 KiB
Go
83 lines
2.5 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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"strings"
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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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const (
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nvidiaContainerRuntimeHookExecuable = "nvidia-container-runtime-hook"
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nvidiaContainerRuntimeHookDefaultPath = "/usr/bin/nvidia-container-runtime-hook"
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nvidiaContainerToolkitExecutable = "nvidia-container-toolkit"
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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(nvidiaContainerRuntimeHookExecuable)
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if err != nil {
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path = nvidiaContainerRuntimeHookDefaultPath
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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, nvidiaContainerRuntimeHookExecuable) {
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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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