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7873c27cfb
strings.ReplaceAll(s, old, new) is a wrapper function for strings.Replace(s, old, new, -1). But strings.ReplaceAll is more readable and removes the hardcoded -1. Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package kernel
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import (
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"os"
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"path"
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"strings"
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"github.com/sirupsen/logrus"
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)
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// writeSystemProperty writes the value to a path under /proc/sys as determined from the key.
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// For e.g. net.ipv4.ip_forward translated to /proc/sys/net/ipv4/ip_forward.
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func writeSystemProperty(key, value string) error {
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keyPath := strings.ReplaceAll(key, ".", "/")
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return os.WriteFile(path.Join("/proc/sys", keyPath), []byte(value), 0644)
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}
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// readSystemProperty reads the value from the path under /proc/sys and returns it
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func readSystemProperty(key string) (string, error) {
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keyPath := strings.ReplaceAll(key, ".", "/")
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value, err := os.ReadFile(path.Join("/proc/sys", keyPath))
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(string(value)), nil
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}
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// ApplyOSTweaks applies the configuration values passed as arguments
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func ApplyOSTweaks(osConfig map[string]*OSValue) {
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for k, v := range osConfig {
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// read the existing property from disk
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oldv, err := readSystemProperty(k)
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if err != nil {
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logrus.WithError(err).Errorf("error reading the kernel parameter %s", k)
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continue
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}
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if propertyIsValid(oldv, v.Value, v.CheckFn) {
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// write new prop value to disk
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if err := writeSystemProperty(k, v.Value); err != nil {
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logrus.WithError(err).Errorf("error setting the kernel parameter %s = %s, (leaving as %s)", k, v.Value, oldv)
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continue
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}
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logrus.Debugf("updated kernel parameter %s = %s (was %s)", k, v.Value, oldv)
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}
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}
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}
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