in validators/kernel_validator.go [179:234]
func (k *KernelValidator) getKernelConfigReader() (io.Reader, error) {
possibePaths := []string{
"/proc/config.gz",
"/boot/config-" + k.kernelRelease,
"/usr/src/linux-" + k.kernelRelease + "/.config",
"/usr/src/linux/.config",
"/usr/lib/modules/" + k.kernelRelease + "/config",
"/usr/lib/ostree-boot/config-" + k.kernelRelease,
"/usr/lib/kernel/config-" + k.kernelRelease,
"/usr/src/linux-headers-" + k.kernelRelease + "/.config",
"/lib/modules/" + k.kernelRelease + "/build/.config",
}
configsModule := "configs"
modprobeCmd := "modprobe"
// loadModule indicates whether we've tried to load kernel config module ourselves.
loadModule := false
for {
for _, path := range possibePaths {
_, err := os.Stat(path)
if err != nil {
continue
}
// Buffer the whole file, so that we can close the file and unload
// kernel config module in this function.
b, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
var r io.Reader
r = bytes.NewReader(b)
// This is a gzip file (config.gz), unzip it.
if filepath.Ext(path) == ".gz" {
r, err = gzip.NewReader(r)
if err != nil {
return nil, err
}
}
return r, nil
}
// If we've tried to load kernel config module, break and return error.
if loadModule {
break
}
// If the kernel config file is not found, try to load the kernel
// config module and check again.
output, err := exec.Command(modprobeCmd, configsModule).CombinedOutput()
if err != nil {
return nil, errors.Wrapf(err, "unable to load kernel module: %q, output: %q, err",
configsModule, output)
}
// Unload the kernel config module to make sure the validation have no side effect.
defer exec.Command(modprobeCmd, "-r", configsModule).Run()
loadModule = true
}
return nil, errors.Errorf("no config path in %v is available", possibePaths)
}