86 lines
1.4 KiB
Go
86 lines
1.4 KiB
Go
package diskio
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"golang.org/x/sys/unix"
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)
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type diskInfoCache struct {
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udevDataPath string
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values map[string]string
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}
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var udevPath = "/run/udev/data"
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func (s *DiskIO) diskInfo(devName string) (map[string]string, error) {
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var err error
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var stat unix.Stat_t
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path := "/dev/" + devName
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err = unix.Stat(path, &stat)
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if err != nil {
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return nil, err
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}
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if s.infoCache == nil {
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s.infoCache = map[string]diskInfoCache{}
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}
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ic, ok := s.infoCache[devName]
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if ok {
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return ic.values, nil
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}
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major := unix.Major(uint64(stat.Rdev))
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minor := unix.Minor(uint64(stat.Rdev))
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udevDataPath := fmt.Sprintf("%s/b%d:%d", udevPath, major, minor)
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di := map[string]string{}
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s.infoCache[devName] = diskInfoCache{
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udevDataPath: udevDataPath,
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values: di,
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}
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f, err := os.Open(udevDataPath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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scnr := bufio.NewScanner(f)
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var devlinks bytes.Buffer
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for scnr.Scan() {
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l := scnr.Text()
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if len(l) < 4 {
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continue
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}
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if l[:2] == "S:" {
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if devlinks.Len() > 0 {
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devlinks.WriteString(" ")
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}
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devlinks.WriteString("/dev/")
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devlinks.WriteString(l[2:])
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continue
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}
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if l[:2] != "E:" {
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continue
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}
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kv := strings.SplitN(l[2:], "=", 2)
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if len(kv) < 2 {
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continue
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}
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di[kv[0]] = kv[1]
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}
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if devlinks.Len() > 0 {
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di["DEVLINKS"] = devlinks.String()
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}
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return di, nil
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}
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