mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
71 lines
2.4 KiB
Go
71 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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"path/filepath"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
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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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)
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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 logger.Interface, nvidiaContainerRuntimeHookPath string) oci.SpecModifier {
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m := stableRuntimeModifier{
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logger: logger,
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nvidiaContainerRuntimeHookPath: nvidiaContainerRuntimeHookPath,
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}
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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 logger.Interface
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nvidiaContainerRuntimeHookPath string
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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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// If an NVIDIA Container Runtime Hook already exists, we don't make any modifications to the spec.
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if spec.Hooks != nil {
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for _, hook := range spec.Hooks.Prestart {
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if isNVIDIAContainerRuntimeHook(&hook) {
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m.logger.Infof("Existing nvidia prestart hook (%v) found in OCI spec", hook.Path)
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return nil
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}
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}
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}
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path := m.nvidiaContainerRuntimeHookPath
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m.logger.Infof("Using prestart hook path: %v", path)
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args := []string{filepath.Base(path)}
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if spec.Hooks == nil {
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spec.Hooks = &specs.Hooks{}
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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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