mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 21:14:00 +00:00
87 lines
2.3 KiB
Go
87 lines
2.3 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 info
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import (
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"fmt"
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"path/filepath"
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"github.com/NVIDIA/go-nvml/pkg/dl"
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)
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// root represents a directory on the filesystem relative to which libraries
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// such as the NVIDIA driver libraries can be found.
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type root string
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func (r root) join(parts ...string) string {
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return filepath.Join(append([]string{string(r)}, parts...)...)
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}
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// assertHasLibrary returns an error if the specified library cannot be loaded.
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func (r root) assertHasLibrary(libraryName string) error {
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const (
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libraryLoadFlags = dl.RTLD_LAZY
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)
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lib := dl.New(r.tryResolveLibrary(libraryName), libraryLoadFlags)
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if err := lib.Open(); err != nil {
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return err
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}
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defer lib.Close()
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return nil
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}
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// tryResolveLibrary attempts to locate the specified library in the root.
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// If the root is not specified, is "/", or the library cannot be found in the
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// set of predefined paths, the input is returned as is.
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func (r root) tryResolveLibrary(libraryName string) string {
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if r == "" || r == "/" {
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return libraryName
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}
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librarySearchPaths := []string{
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"/usr/lib64",
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"/usr/lib/x86_64-linux-gnu",
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"/usr/lib/aarch64-linux-gnu",
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"/lib64",
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"/lib/x86_64-linux-gnu",
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"/lib/aarch64-linux-gnu",
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}
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for _, d := range librarySearchPaths {
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l := r.join(d, libraryName)
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resolved, err := resolveLink(l)
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if err != nil {
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continue
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}
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return resolved
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}
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return libraryName
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}
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// resolveLink finds the target of a symlink or the file itself in the
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// case of a regular file.
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// This is equivalent to running `readlink -f ${l}`.
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func resolveLink(l string) (string, error) {
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resolved, err := filepath.EvalSymlinks(l)
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if err != nil {
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return "", fmt.Errorf("error resolving link '%v': %w", l, err)
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}
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return resolved, nil
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}
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