mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
55ea268829
This adds a function to return a path as a path relative to the specified driver root. Signed-off-by: Evan Lezar <elezar@nvidia.com>
128 lines
3.8 KiB
Go
128 lines
3.8 KiB
Go
/**
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# Copyright 2023 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 root
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import (
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"os"
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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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// Driver represents a filesystem in which a set of drivers or devices is defined.
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type Driver struct {
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logger logger.Interface
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// Root represents the root from the perspective of the driver libraries and binaries.
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Root string
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// librarySearchPaths specifies explicit search paths for discovering libraries.
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librarySearchPaths []string
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// configSearchPaths specified explicit search paths for discovering driver config files.
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configSearchPaths []string
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}
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// New creates a new Driver root using the specified options.
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func New(opts ...Option) *Driver {
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d := &Driver{}
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for _, opt := range opts {
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opt(d)
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}
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if d.logger == nil {
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d.logger = logger.New()
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}
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return d
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}
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// RelativeToRoot returns the specified path relative to the driver root.
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func (r *Driver) RelativeToRoot(path string) string {
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if r.Root == "" || r.Root == "/" {
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return path
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}
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if !filepath.IsAbs(path) {
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return path
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}
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return strings.TrimPrefix(path, r.Root)
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}
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// Files returns a Locator for arbitrary driver files.
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func (r *Driver) Files(opts ...lookup.Option) lookup.Locator {
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return lookup.NewFileLocator(
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append(opts,
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lookup.WithLogger(r.logger),
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lookup.WithRoot(r.Root),
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)...,
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)
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}
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// Libraries returns a Locator for driver libraries.
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func (r *Driver) Libraries() lookup.Locator {
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return lookup.NewLibraryLocator(
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lookup.WithLogger(r.logger),
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lookup.WithRoot(r.Root),
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lookup.WithSearchPaths(normalizeSearchPaths(r.librarySearchPaths...)...),
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)
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}
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// Configs returns a locator for driver configs.
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// If configSearchPaths is specified, these paths are used as absolute paths,
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// otherwise, /etc and /usr/share are searched.
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func (r *Driver) Configs() lookup.Locator {
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return lookup.NewFileLocator(r.configSearchOptions()...)
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}
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func (r *Driver) configSearchOptions() []lookup.Option {
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if len(r.configSearchPaths) > 0 {
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return []lookup.Option{
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lookup.WithLogger(r.logger),
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lookup.WithRoot("/"),
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lookup.WithSearchPaths(normalizeSearchPaths(r.configSearchPaths...)...),
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}
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}
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searchPaths := []string{"/etc"}
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searchPaths = append(searchPaths, xdgDataDirs()...)
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return []lookup.Option{
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lookup.WithLogger(r.logger),
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lookup.WithRoot(r.Root),
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lookup.WithSearchPaths(searchPaths...),
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}
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}
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// normalizeSearchPaths takes a list of paths and normalized these.
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// Each of the elements in the list is expanded if it is a path list and the
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// resultant list is returned.
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// This allows, for example, for the contents of `PATH` or `LD_LIBRARY_PATH` to
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// be passed as a search path directly.
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func normalizeSearchPaths(paths ...string) []string {
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var normalized []string
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for _, path := range paths {
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normalized = append(normalized, filepath.SplitList(path)...)
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}
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return normalized
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}
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// xdgDataDirs finds the paths as specified in the environment variable XDG_DATA_DIRS.
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// See https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html.
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func xdgDataDirs() []string {
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if dirs, exists := os.LookupEnv("XDG_DATA_DIRS"); exists && dirs != "" {
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return normalizeSearchPaths(dirs)
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}
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return []string{"/usr/local/share", "/usr/share"}
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}
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