mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 08:18:32 +00:00
fa5a4ac499
This change udpates the ldcache locator to read the ldcache at construction and use these contents to perform future lookups against. Each of the cache entries are resolved and lookups return the resolved target. Assuming a symlink chain: libcuda.so -> libcuda.so.1 -> libcuda.so.VERSION, this means that libcuda.so.VERION will be returned for any of the following inputs: libcuda.so, libcuda.so.1, libcudal.so.*. Signed-off-by: Evan Lezar <elezar@nvidia.com>
119 lines
2.7 KiB
Go
119 lines
2.7 KiB
Go
/**
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# Copyright 2024 NVIDIA CORPORATION
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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 lookup
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import (
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"fmt"
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"path/filepath"
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"slices"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/ldcache"
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)
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type ldcacheLocator struct {
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*builder
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resolvesTo map[string]string
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}
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var _ Locator = (*ldcacheLocator)(nil)
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func NewLdcacheLocator(opts ...Option) Locator {
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b := newBuilder(opts...)
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cache, err := ldcache.New(b.logger, b.root)
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if err != nil {
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b.logger.Warningf("Failed to load ldcache: %v", err)
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if b.isOptional {
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return &null{}
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}
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return ¬Found{}
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}
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chain := NewSymlinkChainLocator(WithOptional(true))
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resolvesTo := make(map[string]string)
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_, libs64 := cache.List()
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for _, library := range libs64 {
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if _, processed := resolvesTo[library]; processed {
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continue
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}
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candidates, err := chain.Locate(library)
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if err != nil {
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b.logger.Errorf("error processing library %s from ldcache: %v", library, err)
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continue
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}
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if len(candidates) == 0 {
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resolvesTo[library] = library
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continue
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}
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// candidates represents a symlink chain.
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// The first element represents the start of the chain and the last
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// element the final target.
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target := candidates[len(candidates)-1]
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for _, candidate := range candidates {
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resolvesTo[candidate] = target
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}
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}
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return &ldcacheLocator{
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builder: b,
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resolvesTo: resolvesTo,
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}
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}
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// Locate finds the specified libraryname.
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// If the input is a library name, the ldcache is searched otherwise the
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// provided path is resolved as a symlink.
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func (l ldcacheLocator) Locate(libname string) ([]string, error) {
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var matcher func(string, string) bool
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if filepath.IsAbs(libname) {
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matcher = func(p string, c string) bool {
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m, _ := filepath.Match(filepath.Join(l.root, p), c)
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return m
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}
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} else {
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matcher = func(p string, c string) bool {
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m, _ := filepath.Match(p, filepath.Base(c))
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return m
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}
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}
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var matches []string
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seen := make(map[string]bool)
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for name, target := range l.resolvesTo {
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if !matcher(libname, name) {
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continue
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}
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if seen[target] {
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continue
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}
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seen[target] = true
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matches = append(matches, target)
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}
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slices.Sort(matches)
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if len(matches) == 0 && !l.isOptional {
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return nil, fmt.Errorf("%s: %w", libname, ErrNotFound)
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}
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return matches, nil
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}
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