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source/kernel: add more search paths

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Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>
This commit is contained in:
Mikko Ylinen 2020-08-24 20:54:59 +03:00
parent 109da6c980
commit 3fd314b600
1 changed files with 37 additions and 24 deletions
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67
source/kernel/kernel.go
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@ -19,9 +19,11 @@ package kernel
import (
"bytes"
"compress/gzip"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"strings"
@ -85,7 +87,7 @@ func (s *Source) Discover() (source.Features, error) {
}
// Read kconfig
kconfig, err := s.parseKconfig()
kconfig, err := parseKconfig(s.config.KconfigFile)
if err != nil {
log.Printf("ERROR: Failed to read kconfig: %s", err)
}
@ -158,42 +160,53 @@ func readKconfigGzip(filename string) ([]byte, error) {
}
// Read kconfig into a map
func (s *Source) parseKconfig() (map[string]string, error) {
func parseKconfig(configPath string) (map[string]string, error) {
kconfig := map[string]string{}
raw := []byte(nil)
var err error
var searchPaths []string
// First, try kconfig specified in the config file
if len(s.config.KconfigFile) > 0 {
raw, err = ioutil.ReadFile(s.config.KconfigFile)
if err != nil {
log.Printf("ERROR: Failed to read kernel config from %s: %s", s.config.KconfigFile, err)
}
}
// Then, try to read from /proc
if raw == nil {
raw, err = readKconfigGzip("/proc/config.gz")
if err != nil {
log.Printf("Failed to read /proc/config.gz: %s", err)
}
}
// Last, try to read from /boot/
if raw == nil {
// Get kernel version
unameRaw, err := ioutil.ReadFile("/proc/sys/kernel/osrelease")
uname := strings.TrimSpace(string(unameRaw))
kVer := strings.TrimSpace(string(unameRaw))
if err != nil {
return nil, err
searchPaths = []string{
"/proc/config.gz",
"/usr/src/linux/.config",
}
// Read kconfig
raw, err = ioutil.ReadFile(source.BootDir.Path("config-" + uname))
if err != nil {
return nil, err
} else {
// from k8s.io/system-validator used by kubeadm
// preflight checks
searchPaths = []string{
"/proc/config.gz",
"/usr/src/linux-" + kVer + "/.config",
"/usr/src/linux/.config",
"/usr/lib/modules/" + kVer + "/config",
"/usr/lib/ostree-boot/config-" + kVer,
"/usr/lib/kernel/config-" + kVer,
"/usr/src/linux-headers-" + kVer + "/.config",
"/lib/modules/" + kVer + "/build/.config",
source.BootDir.Path("config-" + kVer),
}
}
for _, path := range append([]string{configPath}, searchPaths...) {
if len(path) > 0 {
if ".gz" == filepath.Ext(path) {
if raw, err = readKconfigGzip(path); err == nil {
break
}
} else {
if raw, err = ioutil.ReadFile(path); err == nil {
break
}
}
}
}
if raw == nil {
return nil, fmt.Errorf("Failed to read kernel config from %+v:", append([]string{configPath}, searchPaths...))
}
// Regexp for matching kconfig flags
re := regexp.MustCompile(`^CONFIG_(?P<flag>\w+)=(?P<value>.+)`)