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Merge pull request #85 from cdesiniotis/move-file-discovery-to-go
[mig-manager] move library/nvidia-smi discovery logic to Go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| /* | ||
| # Copyright 2024 NVIDIA CORPORATION | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
| */ | ||
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| package main | ||
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| import ( | ||
| "fmt" | ||
| "path/filepath" | ||
| ) | ||
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| type root string | ||
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| // getDriverLibraryPath returns path to `libnvidia-ml.so.1` in the driver root. | ||
| // The folder for this file is also expected to be the location of other driver files. | ||
| func (r root) getDriverLibraryPath() (string, error) { | ||
| librarySearchPaths := []string{ | ||
| "/usr/lib64", | ||
| "/usr/lib/x86_64-linux-gnu", | ||
| "/usr/lib/aarch64-linux-gnu", | ||
| "/lib64", | ||
| "/lib/x86_64-linux-gnu", | ||
| "/lib/aarch64-linux-gnu", | ||
| } | ||
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| libraryPath, err := r.findFile("libnvidia-ml.so.1", librarySearchPaths...) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
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| return libraryPath, nil | ||
| } | ||
|
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| // getNvidiaSMIPath returns path to the `nvidia-smi` executable in the driver root. | ||
| func (r root) getNvidiaSMIPath() (string, error) { | ||
| binarySearchPaths := []string{ | ||
| "/usr/bin", | ||
| "/usr/sbin", | ||
| "/bin", | ||
| "/sbin", | ||
| } | ||
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| binaryPath, err := r.findFile("nvidia-smi", binarySearchPaths...) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| return binaryPath, nil | ||
| } | ||
|
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| // findFile searches the root for a specified file. | ||
| // A number of folders can be specified to search in addition to the root itself. | ||
| // If the file represents a symlink, this is resolved and the final path is returned. | ||
| func (r root) findFile(name string, searchIn ...string) (string, error) { | ||
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| for _, d := range append([]string{"/"}, searchIn...) { | ||
| l := filepath.Join(string(r), d, name) | ||
| candidate, err := resolveLink(l) | ||
| if err != nil { | ||
| continue | ||
| } | ||
| return candidate, nil | ||
| } | ||
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| return "", fmt.Errorf("error locating %q", name) | ||
| } | ||
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| // resolveLink finds the target of a symlink or the file itself in the | ||
| // case of a regular file. | ||
| // This is equivalent to running `readlink -f ${l}`. | ||
| func resolveLink(l string) (string, error) { | ||
| resolved, err := filepath.EvalSymlinks(l) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error resolving link '%s': %w", l, err) | ||
| } | ||
| return resolved, nil | ||
| } |
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