mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
87 lines
2.6 KiB
Go
87 lines
2.6 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 runtime
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import (
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"fmt"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/oci"
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log "github.com/sirupsen/logrus"
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)
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type modifyingRuntimeWrapper struct {
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logger *log.Logger
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runtime oci.Runtime
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ociSpec oci.Spec
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modifier oci.SpecModifier
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}
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var _ oci.Runtime = (*modifyingRuntimeWrapper)(nil)
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// NewModifyingRuntimeWrapper creates a runtime wrapper that applies the specified modifier to the OCI specification
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// before invoking the wrapped runtime. If the modifier is nil, the input runtime is returned.
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func NewModifyingRuntimeWrapper(logger *log.Logger, runtime oci.Runtime, spec oci.Spec, modifier oci.SpecModifier) oci.Runtime {
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if modifier == nil {
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logger.Infof("Using low-level runtime with no modification")
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return runtime
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}
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rt := modifyingRuntimeWrapper{
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logger: logger,
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runtime: runtime,
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ociSpec: spec,
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modifier: modifier,
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}
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return &rt
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}
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// Exec checks whether a modification of the OCI specification is required and modifies it accordingly before exec-ing
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// into the wrapped runtime.
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func (r *modifyingRuntimeWrapper) Exec(args []string) error {
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if oci.HasCreateSubcommand(args) {
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err := r.modify()
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if err != nil {
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return fmt.Errorf("could not apply required modification to OCI specification: %v", err)
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}
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r.logger.Infof("Applied required modification to OCI specification")
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} else {
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r.logger.Infof("No modification of OCI specification required")
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}
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r.logger.Infof("Forwarding command to runtime")
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return r.runtime.Exec(args)
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}
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// modify loads, modifies, and flushes the OCI specification using the defined Modifier
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func (r *modifyingRuntimeWrapper) modify() error {
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_, err := r.ociSpec.Load()
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if err != nil {
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return fmt.Errorf("error loading OCI specification for modification: %v", err)
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}
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err = r.ociSpec.Modify(r.modifier)
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if err != nil {
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return fmt.Errorf("error modifying OCI spec: %v", err)
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}
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err = r.ociSpec.Flush()
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if err != nil {
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return fmt.Errorf("error writing modified OCI specification: %v", err)
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}
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return nil
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}
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