mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-29 07:21:46 +00:00
7352a90b95
This change switches to using the WithCache decorator for mounts instead of keeping track of a cache locally. This addresses a race condition when using the mounts structure. Signed-off-by: Evan Lezar <elezar@nvidia.com>
114 lines
2.9 KiB
Go
114 lines
2.9 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 discover
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import (
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"fmt"
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"path/filepath"
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"strings"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
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)
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// mounts is a generic discoverer for Mounts. It is customized by specifying the
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// required entities as a list and a Locator that is used to find the target mounts
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// based on the entry in the list.
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type mounts struct {
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None
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logger logger.Interface
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lookup lookup.Locator
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root string
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required []string
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}
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var _ Discover = (*mounts)(nil)
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// NewMounts creates a discoverer for the required mounts using the specified locator.
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func NewMounts(logger logger.Interface, lookup lookup.Locator, root string, required []string) Discover {
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return WithCache(newMounts(logger, lookup, root, required))
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}
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// newMounts creates a discoverer for the required mounts using the specified locator.
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func newMounts(logger logger.Interface, lookup lookup.Locator, root string, required []string) *mounts {
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return &mounts{
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logger: logger,
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lookup: lookup,
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root: filepath.Join("/", root),
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required: required,
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}
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}
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func (d *mounts) Mounts() ([]Mount, error) {
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if d.lookup == nil {
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return nil, fmt.Errorf("no lookup defined")
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}
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uniqueMounts := make(map[string]Mount)
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for _, candidate := range d.required {
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d.logger.Debugf("Locating %v", candidate)
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located, err := d.lookup.Locate(candidate)
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if err != nil {
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d.logger.Warningf("Could not locate %v: %v", candidate, err)
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continue
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}
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if len(located) == 0 {
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d.logger.Warningf("Missing %v", candidate)
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continue
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}
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d.logger.Debugf("Located %v as %v", candidate, located)
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for _, p := range located {
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if _, ok := uniqueMounts[p]; ok {
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d.logger.Debugf("Skipping duplicate mount %v", p)
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continue
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}
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r := d.relativeTo(p)
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if r == "" {
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r = p
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}
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d.logger.Infof("Selecting %v as %v", p, r)
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uniqueMounts[p] = Mount{
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HostPath: p,
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Path: r,
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Options: []string{
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"ro",
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"nosuid",
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"nodev",
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"bind",
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},
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}
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}
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}
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var mounts []Mount
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for _, m := range uniqueMounts {
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mounts = append(mounts, m)
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}
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return mounts, nil
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}
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// relativeTo returns the path relative to the root for the file locator
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func (d *mounts) relativeTo(path string) string {
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if d.root == "/" {
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return path
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}
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return strings.TrimPrefix(path, d.root)
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}
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