/
chattr.go
87 lines (75 loc) · 2.05 KB
/
chattr.go
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package chattr
import (
"bytes"
"fmt"
"os"
"os/exec"
"path"
"strings"
"github.com/sirupsen/logrus"
)
const (
chattrCmd = "chattr"
lsattrCmd = "lsattr"
)
func AddImmutable(path string) error {
chattrBin := which(chattrCmd)
if _, err := os.Stat(path); err == nil {
cmd := exec.Command(chattrBin, "+i", path)
var stderr bytes.Buffer
cmd.Stderr = &stderr
if err = cmd.Run(); err != nil {
return fmt.Errorf("%s +i failed: %s. Err: %v", chattrBin, stderr.String(), err)
}
}
return nil
}
func RemoveImmutable(path string) error {
chattrBin := which(chattrCmd)
if _, err := os.Stat(path); err == nil {
cmd := exec.Command(chattrBin, "-i", path)
var stderr bytes.Buffer
cmd.Stderr = &stderr
if err = cmd.Run(); err != nil {
return fmt.Errorf("%s -i failed: %s. Err: %v", chattrBin, stderr.String(), err)
}
}
return nil
}
func IsImmutable(path string) bool {
lsattrBin := which(lsattrCmd)
if _, err := os.Stat(path); err != nil {
logrus.Errorf("Failed to stat mount path:%v", err)
return true
}
op, err := exec.Command(lsattrBin, "-d", path).CombinedOutput()
if err != nil {
// Cannot get path status, return true so that immutable bit is not reverted
logrus.Errorf("Error listing attrs for %v err:%v", path, string(op))
return true
}
// 'lsattr -d' output is a single line with 2 fields separated by space; 1st one
// is list of applicable attrs and 2nd field is the path itself.Sample output below.
// lsattr -d /mnt/vol2
// ----i--------e-- /mnt/vol2
attrs := strings.Split(string(op), " ")
if len(attrs) != 2 {
// Cannot get path status, return true so that immutable bit is not reverted
logrus.Errorf("Invalid lsattr output %v", string(op))
return true
}
if strings.Contains(attrs[0], "i") {
logrus.Warnf("Path %v already set to immutable", path)
return true
}
return false
}
func which(bin string) string {
pathList := []string{"/usr/bin", "/sbin", "/usr/sbin", "/usr/local/bin"}
for _, p := range pathList {
if _, err := os.Stat(path.Join(p, bin)); err == nil {
return path.Join(p, bin)
}
}
return bin
}