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main.go
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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"log"
"os"
"path/filepath"
"strings"
)
var (
configDir string
sysfsDir string
)
func init() {
flag.StringVar(&configDir, "configDir", "/etc/sysfs.d", "directory with config files")
flag.StringVar(&sysfsDir, "sysfsDir", "/sys", "mount point for sysfs")
}
func sysfs(line []byte) error {
// parse line into a string of expected form X/Y/Z=VALUE
sysfsLineKV := strings.Split(string(line[:]), "=")
if len(sysfsLineKV) != 2 {
if len(sysfsLineKV) >= 1 && len(sysfsLineKV[0]) >= 1 && strings.Trim(sysfsLineKV[0], " ")[:1] == "#" {
return nil
}
return fmt.Errorf("Cannot parse %s", string(line))
}
// trim any extra whitespace
sysfsSetting, sysfsValue := strings.Trim(sysfsLineKV[0], " "), strings.Trim(sysfsLineKV[1], " ")
sysfsFile := filepath.Join(sysfsDir, sysfsSetting)
file, err := os.OpenFile(sysfsFile, os.O_WRONLY, 0)
if err != nil {
return fmt.Errorf("Cannot open %s: %s", sysfsFile, err)
}
defer file.Close()
_, err = file.Write([]byte(sysfsValue))
if err != nil {
return fmt.Errorf("Cannot write to %s: %s", sysfsFile, err)
}
return nil
}
func main() {
flag.Parse()
files, err := os.ReadDir(configDir)
if err != nil {
log.Fatalf("Cannot read directory %s: %s", configDir, err)
}
for _, file := range files {
contents, err := os.ReadFile(filepath.Join(configDir, file.Name()))
if err != nil {
log.Fatalf("Cannot read file %s: %s", file.Name(), err)
}
lines := bytes.Split(contents, []byte("\n"))
for _, line := range lines {
if len(line) == 0 {
continue
}
err = sysfs(line)
if err != nil {
log.Fatal(err)
}
}
}
}