return error if cpufreq's are empty #426
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fixes prometheus/node_exporter#2198 when collector successful but empty |
SuperQ
requested changes
Dec 17, 2022
sysfs/system_cpu.go
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| @@ -178,6 +180,10 @@ func (fs FS) SystemCpufreq() ([]SystemCPUCpufreqStats, error) { | |||
| return nil, err | |||
| } | |||
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| if len(systemCpufreq) == 0 { | |||
| return nil, fmt.Errorf("could not find any cpufreq files") | |||
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Two issues. We need to make an identifiable error so that downstream can tell a "not found" vs a parsing error.
For example, we could return os.ErrNotExist.
Or we make a new procfs error var with errors.New().
This way we can use errors.Is().
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Maybe return fmt.Errorf("could not find any cpufreq files: %w", os.ErrNotExist)?
Signed-off-by: Sergei Semenchuk <pdp.eleven11@gmail.com>
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SuperQ
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Dec 22, 2022
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Signed-off-by: Sergei Semenchuk pdp.eleven11@gmail.com