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package sysctl
import (
"bufio"
"fmt"
"os"
"strings"
)
const sysctlConfPath = "/etc/sysctl.conf"
// parseConfig reads a sysctl configuration file and parses its content
func parseConfig(path string, out map[string]string) error {
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("could not open file: %v", err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
parsed := strings.Split(line, "#")[0]
parsed = strings.Split(parsed, ";")[0]
parsed = strings.TrimSpace(parsed)
if parsed == "" {
continue
}
tokens := strings.Split(parsed, "=")
if len(tokens) != 2 {
return fmt.Errorf("could not parse line %s", line)
}
k := strings.TrimSpace(tokens[0])
v := strings.TrimSpace(tokens[1])
out[k] = v
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("error reading file: %v", err)
}
return nil
}
// LoadConfig gets sysctl values from a list of sysctl configuration files.
// The values in the rightmost files take priority.
// If no file is specified, values are read from /etc/sysctl.conf.
func LoadConfig(files ...string) (map[string]string, error) {
if len(files) == 0 {
files = []string{sysctlConfPath}
}
out := make(map[string]string)
for _, f := range files {
if err := parseConfig(f, out); err != nil {
return nil, fmt.Errorf("could not parse file %s: %v", f, err)
}
}
return out, nil
}
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